Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2018	Feb. 21, 2019
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Trading Symbol	BRO
Entity Registrant Name	BROWN & BROWN, INC.
Entity Central Index Key	0000079282
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		279,701,832
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float	$ 6,377,992,646

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
REVENUES
Commissions and fees	$ 2,009,857	$ 1,857,270	$ 1,762,787
Investment income	2,746	1,626	1,456
Other income, net	1,643	22,451	2,386
Total revenues	2,014,246	1,881,347	1,766,629
EXPENSES
Employee compensation and benefits	1,068,914	994,652	925,217
Non-cash stock-based compensation	33,519	30,631	16,052
Other operating expenses	332,118	283,470	262,872
(Gain)/loss on disposal	(2,175)	(2,157)	(1,291)
Amortization	86,544	85,446	86,663
Depreciation	22,834	22,698	21,003
Interest	40,580	38,316	39,481
Change in estimated acquisition earn-out payables	2,969	9,200	9,185
Total expenses	1,551,784	1,431,625	1,343,130
Income before income taxes	462,462	449,722	423,499
Income taxes	118,207	50,092	166,008
Net income	$ 344,255	$ 399,630	$ 257,491
Net income per share:
Basic (in dollars per share)	$ 1.24	$ 1.43	$ 0.92
Diluted (in dollars per share)	1.22	1.40	0.91
Dividends declared per share (in dollars per share)	$ 0.31	$ 0.28	$ 0.25

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 438,961	$ 573,383
Restricted cash and investments	338,635	250,705
Short-term investments	12,868	24,965
Premiums, commissions and fees receivable	844,815	546,402
Reinsurance recoverable	65,396	477,820
Prepaid reinsurance premiums	337,920	321,017
Other current assets	128,716	47,864
Total current assets	2,167,311	2,242,156
Fixed assets, net	100,395	77,086
Goodwill	3,432,786	2,716,079
Amortizable intangible assets, net	898,807	641,005
Investments	17,394	13,949
Other assets	71,975	57,275
Total assets	6,688,668	5,747,550
Current Liabilities:
Premiums payable to insurance companies	857,559	685,163
Losses and loss adjustment reserve	65,212	476,721
Unearned premiums	337,920	321,017
Premium deposits and credits due customers	105,640	91,648
Accounts payable	87,345	64,177
Accrued expenses and other liabilities	279,310	228,748
Current portion of long-term debt	50,000	120,000
Total current liabilities	1,782,986	1,987,474
Long-term debt less unamortized discount and debt issuance costs	1,456,990	856,141
Deferred income taxes, net	315,732	256,185
Other liabilities	132,392	65,051
Shareholders’ Equity:
Common stock, par value $0.10 per share; authorized 560,000 shares; issued 293,380 shares and outstanding 279,583 shares at 2018, issued 286,929 shares and outstanding 276,210 shares at 2017 - in thousands. 2017 share amounts reflect the 2-for-1 stock split effective March 28, 2018	29,338	28,689
Additional paid-in capital	615,180	483,733
Treasury stock, at cost at 13,797 and 10,719 shares at 2018 and 2017, respectively - in thousands	(477,572)	(386,322)
Retained earnings	2,833,622	2,456,599
Total shareholders’ equity	3,000,568	2,582,699
Total liabilities and shareholders’ equity	$ 6,688,668	$ 5,747,550

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Short-term Investments	$ 12,868	$ 24,965
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	560,000,000	560,000,000
Common stock, shares issued (in shares)	293,379,702	286,929,229
Common Stock, Shares, Outstanding	279,583,006	276,210,910
Treasury stock shares (in shares)	13,796,696	10,718,319
Tax effect of accumulated other comprehensive income	$ 0	$ 0

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Document Period End Date	Dec. 31, 2018
Cash, Cash Equivalents and Restricted Cash	$ 777,596	$ 824,088	$ 781,283	$ 673,173
Cash flows from operating activities:
Net income	344,255	399,630	257,491
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization	86,544	85,446	86,663
Depreciation	22,834	22,698	21,003
Share-based Compensation	33,519	30,631	16,052
Change in estimated acquisition earn-out payables	2,969	9,200	9,185
Deferred income taxes	15,008	(102,183)	18,163
Amortization of debt discount and disposal of deferred financing costs	1,627	1,840	1,762
Accretion (Amortization) of Discounts and Premiums, Investments	(10)	(22)	(39)
Income tax benefit from exercise of shares from the stock benefit plans	0	0	(7,346)
Payments On Acquisition Earn Outs In Excess Of Original Estimated Payables	(12,538)	(14,501)	(3,904)
(Gain)/loss on sales of investments, fixed assets and customer accounts	(1,934)	(1,841)	596
Changes in operating assets and liabilities, net of effect from acquisitions and divestitures:
Premiums, commissions and fees receivable (increase) decrease	(93,630)	(43,306)	(63,550)
Reinsurance recoverables (increase) decrease	412,424	(399,737)	(46,115)
Prepaid reinsurance premiums (increase) decrease	(16,903)	(12,356)	982
Other assets (increase) decrease	(22,440)	(9,747)	(4,718)
Premiums payable to insurance companies (increase) decrease	141,169	37,380	66,084
Premium deposits and credits due customers increase (decrease)	13,792	7,750	527
Losses and loss adjustment reserve increase (decrease)	(411,509)	398,638	46,115
Unearned premiums increase (decrease)	16,903	12,356	(982)
Accounts payable increase (decrease)	21,880	26,798	30,174
Accrued expenses and other liabilities increase (decrease)	22,801	25,509	8,670
Other liabilities increase (decrease)	(9,232)	(32,252)	(25,849)
Net cash provided by operating activities	567,529	441,975	411,042
Cash flows from investing activities:
Additions to fixed assets	(41,520)	(24,192)	(17,765)
Payments for businesses acquired, net of cash acquired	(923,874)	(41,471)	(122,622)
Proceeds from sales of fixed assets and customer accounts	4,984	4,094	4,957
Purchases of investments	(9,284)	(10,665)	(25,872)
Proceeds from Sale, Maturity and Collection of Investments	17,923	9,644	18,890
Net cash used in investing activities	(951,771)	(62,590)	(142,412)
Cash flows from financing activities:
Payments on acquisition earn-outs	(14,059)	(29,265)	(24,309)
Proceeds from Issuance of Long-term Debt	300,000	0	0
Payments on long-term debt	(120,000)	(96,750)	(73,125)
Income tax benefit from exercise of shares from the stock benefit plans	0	0	7,346
Issuances of common stock for employee stock benefit plans	19,432	17,422	15,983
Repurchase of stock benefit plan shares for employees to fund tax withholdings	(12,155)	(7,565)	(8,495)
Purchase of treasury stock	(91,250)	(128,639)	(18,908)
Settlement (prepayment) of accelerated share repurchase program	(8,750)	(11,250)	(11,250)
Cash dividends paid	(84,690)	(77,712)	(70,262)
Net cash provided by (used in) financing activities	337,750	(336,580)	(160,520)
Payments of Debt Issuance Costs	(778)	(2,821)
Net increase (decrease) in cash and cash equivalents inclusive of restricted cash	(46,492)	42,805	108,110
Proceeds from Lines of Credit	600,000	0	0
Repayments of Lines of Credit	$ 250,000	$ 0	$ 0

Shareholders Equity Statement - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]
Common Stock, Shares, Outstanding		282,077
Stockholders' Equity Attributable to Parent at Dec. 31, 2015	$ 2,149,776	$ 28,209	$ 412,931	$ (238,775)	$ 1,947,411
Common Stock Issued to Directors	500,000	4,000	496,000
Dividends, Cash	$ (70,262)				(70,262)
Net Income (Loss) Attributable to Parent	257,491				257,491
Stock Issued During Period, Value, Employee Benefit Plan		3,350
Stock Issued During Period, Value, Employee Benefit Plan	23,018	$ 334	$ 22,684
Treasury Stock, Value, Acquired, Cost Method	(7,658)		11,250	(18,908)
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	7,346		7,346
Common Stock Issued to Directors Shares		34
Stockholders' Equity Attributable to Parent at Dec. 31, 2016	$ 2,360,211	$ 28,547	$ 454,707	(257,683)	2,134,640
Common Stock, Shares, Outstanding		285,461
Common Stock Issued to Directors	500,000	2,000	498,000
Dividends, Cash	$ (77,712)				(77,712)
Net Income (Loss) Attributable to Parent	399,630				399,630
Stock Issued During Period, Value, Employee Benefit Plan		1,412
Stock Issued During Period, Value, Employee Benefit Plan	39,965	$ 140	$ 39,825
Treasury Stock, Value, Acquired, Cost Method	(139,889)		(11,250)	(128,639)
Common Stock Issued to Directors Shares		22
Stockholders' Equity Attributable to Parent at Dec. 31, 2017	2,582,699	$ 28,689	483,733	(386,322)	2,456,599
Stockholders' Equity Attributable to Parent (Accounting Standards Update 2014-09 [Member]) at Dec. 31, 2017	$ 2,700,214	$ 28,689	483,733	(386,322)	2,574,114
Cumulative Effect of New Accounting Principle in Period of Adoption \| Accounting Standards Update 2014-09 [Member]					117,515
Common Stock, Shares, Outstanding	276,210,910	286,895
Common Stock, Shares, Outstanding \| Accounting Standards Update 2014-09 [Member]		286,895
Net Unrealized Holding Gain on Available for Sale Securities	$ (6)		$ (47)		41
Common Stock Issued to Directors	700,000	1,000	699,000
Dividends, Cash	$ (84,690)				(84,690)
Net Income (Loss) Attributable to Parent	344,255				344,255
Stock Issued During Period, Value, Employee Benefit Plan		3,096
Stock Issued During Period, Value, Employee Benefit Plan	40,167	$ 310	$ 39,857
Stock Issued During Period, Shares, Acquisitions		3,376
Stock Issued During Period, Value, Acquisitions	100,000	$ 338	99,662
Treasury Stock, Value, Acquired, Cost Method	(100,000)		(8,750)	(91,250)
Common Stock Issued to Directors Shares		13
Stockholders' Equity Attributable to Parent at Dec. 31, 2018	$ 3,000,568	$ 29,338	615,180	$ (477,572)	2,833,622
Common Stock, Shares, Outstanding	279,583,006	293,380
Net Unrealized Holding Gain on Available for Sale Securities	$ (78)		$ (21)		$ (57)

Summary of Significant Accounting Policies (Notes)

12 Months Ended

Dec. 31, 2018

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Significant Accounting Policies [Text Block]

NOTE 1· Summary of Significant Accounting Policies

Nature of Operations

Brown & Brown, Inc., a Florida corporation, and its subsidiaries (collectively, “Brown & Brown” or the “Company”) is a diversified insurance agency, wholesale brokerage, insurance programs and services organization that markets and sells to its customers, insurance products and services, primarily in the property, casualty and employee benefits areas. Brown & Brown’s business is divided into four reportable segments: the Retail Segment provides a broad range of insurance products and services to commercial, public and quasi-public entities, professional and individual customers; the National Programs Segment, acting as a managing general agent (“MGA”), provides professional liability and related package products for certain professionals, a range of insurance products for individuals, flood coverage, and targeted products and services designated for specific industries, trade groups, governmental entities and market niches, all of which are delivered through a nationwide network of independent agents, including Brown & Brown retail agents; the Wholesale Brokerage Segment markets and sells excess and surplus commercial insurance, primarily through a nationwide network of independent agents and brokers, as well as Brown & Brown Retail offices; and the Services Segment provides insurance-related services, including third-party claims administration and comprehensive medical utilization management services in both the workers’ compensation and all-lines liability arenas, as well as Medicare Set-aside services, Social Security disability and Medicare benefits advocacy services, and claims adjusting services.

Recently Issued Accounting Pronouncements

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)” (“ASU 2016-02”), which provides guidance for accounting for leases. Under ASU 2016-02, the Company will be required to recognize the assets and liabilities for the rights and obligations created by leased assets with initial maturities greater than one year. In July 2018, the FASB also issued ASU 2018-10 and ASU 2018-11 related to Topic 842. ASU 2018-10 narrows certain aspects of the guidance issued in the amendments within ASU 2016-02. ASU 2018-11 provides entities with an additional transition method to adopt ASU 2016-02. Under this new transition method, at the adoption date, a company shall recognize a cumulative-effect adjustment to the opening balance of retained earnings. ASU 2016-02, along with ASU 2018-10 and ASU 2018-11, will take effect for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Company continues to evaluate the impact of this pronouncement with the principal impact expected to be the present value of the remaining lease payments and will be presented as a liability on the balance sheet as well as an asset of similar value representing the “Right of Use” for those leased properties. The Company plans to adopt Topic 842 under the transition method provided by ASU 2018-11. The undiscounted contractual cash payments remaining on leased properties were $213.2 million as of December 31, 2016, $210.4 million as of December 31, 2017 and $210.0 million as of December 31, 2018 as detailed in Note 14 “Commitments and Contingencies.”

In August 2018, the FASB issued ASU 2018-15, “Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract,” which provides guidance for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). ASU 2018-15 will take effect for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The Company is currently evaluating the impact of this pronouncement.

Recently Adopted Accounting Standards

In November 2016, the Financial Accountings Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-18, “Statement of Cash Flows (Topic 230)”: Restricted Cash (“ASU 2016-18”), which requires that the Statement of Cash Flows explain the changes during the period of cash and cash equivalents inclusive of amounts categorized as restricted cash. ASU 2016-18 is effective for periods beginning after December 15, 2017. However, the Company elected to early adopt for the reporting period beginning January 1, 2017 under the full retrospective approach for all periods presented. With the adoption of ASU 2016-18, the change in restricted cash is no longer reflected as a change in operating assets and liabilities, and the Statement of Cash Flows details the changes in the balance of cash and cash equivalents inclusive of restricted cash. Net cash provided by operating activities for the year ended December 31, 2016 were previously reported as $375.2 million. With the retrospective adoption, the net cash provided by operating activities for the year ended December 31, 2016 is now reported as $411.0 million. The Company reflects cash collected from customers that is payable to insurance companies as restricted cash if segregation of this cash is required by the state of domicile for the office conducting this transaction or if required by contract with the relevant insurance company providing coverage. Cash collected from customers that is payable to insurance companies is reported in cash and cash equivalents if no such restriction is required.

In August 2016, the FASB issued ASU 2016-15, “Statement of Cash Flows (Topic 230)”: Classification of Certain Cash Receipts and Cash Payments (a consensus of the Emerging Issues Task Force) (“ASU 2016-15”), which addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice in how certain cash receipts and cash payments are presented and classified and applies to all entities, including both business entities and not-for-profit entities that are required to present a statement of cash flows under Topic 230. ASU 2016-15 became effective for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017 with early adoption permitted. The Company adopted ASU 2016-15 effective January 1, 2018 and has determined there is no impact

on the Company’s Statement of Cash Flows. The Company already presented cash paid on contingent consideration in business combination as prescribed by ASU 2016-15 and does not, at this time, engage in the other activities being addressed in this ASU.

In March 2016, the FASB issued ASU 2016-09, “Improvements to Employee Share Based Payment Accounting” (“ASU 2016-09”), which amends guidance issued in Accounting Standards Codification (“ASC”) Topic 718, Compensation - Stock Compensation. ASU 2016-09 simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. ASU 2016-09 is effective for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years and early adoption is permitted. The Company adopted the guidance on January 1, 2017, as required. Prior periods have not been adjusted, as the guidance was adopted prospectively. The principal impact is that the tax benefit or expense from stock compensation is now presented in the income tax line of the Statement of Income, whereas the prior treatment was to present this amount as a component of equity on the Balance Sheet. In addition, the tax benefit or expense is now presented as activity in Cash Flow from Operating Activity, rather than the prior presentation as Cash Flow from Financing Activity in the Statement of Cash Flows. The Company also continues to estimate forfeitures of stock grants as allowed by ASU 2016-09.

In March 2016, the FASB issued ASU 2016-08, “Principal Versus Agent Considerations (Reporting Revenue Gross Versus Net)” (“ASU 2016-08”) to clarify certain aspects of the principal-versus-agent guidance included in the new revenue standard ASU 2014-09 “Revenue from Contracts with Customers” (“ASU 2014-09”). The FASB issued the ASU in response to concerns identified by stakeholders, including those related to (1) determining the appropriate unit of account under the revenue standard’s principal-versus-agent guidance and (2) applying the indicators of whether an entity is a principal or an agent in accordance with the revenue standard’s control principle. The Company adopted ASU 2016-08 effective contemporaneously with ASU 2014-09 beginning January 1, 2018. The impact of ASU 2016-08 was limited to the claims administering activities of one of our businesses within our Services Segment and therefore was not material to the net income of the Company.

In November 2015, FASB issued ASU No. 2015-17, “Income Taxes (Topic 740) - Balance Sheet Classification of Deferred Taxes” (“ASU 2015-17”), which simplifies the presentation of deferred income taxes by requiring deferred tax assets and liabilities be classified as a single non-current item on the balance sheet. ASU 2015-17 is effective for fiscal years beginning after December 15, 2016 with early adoption permitted as of the beginning of any interim or annual reporting period. The Company adopted the guidance on January 1, 2017, as required and prior period have been adjusted to reflect this adoption. This reclassification occurred prior to the passage of the Tax Cuts and Jobs Act of 2017, which had a material impact on the value of deferred tax items. See Note 10 “Income Taxes” for more information.

In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606)” (“Topic 606”), which provides guidance for revenue recognition. Topic 606 affects any entity that either enters into contracts with customers to transfer goods or services. It supersedes the revenue recognition requirements in Topic 605, “Revenue Recognition,” and most industry-specific guidance. The standard’s core principle is that a company should recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which a company expects to be entitled in exchange for those goods or services. Effective as of January 1, 2018, the Company adopted ASU 2014–09, and all related amendments, which established ASC Topic 606. The Company adopted these standards by recognizing the cumulative effect as an adjustment to opening retained earnings at January 1, 2018, under the modified retrospective method for contracts not completed as of the day of adoption. The cumulative impact of adopting Topic 606 on January 1, 2018 was an increase in retained earnings within stockholders’ equity of $117.5 million. Under the modified retrospective method, the Company was not required to restate comparative financial information prior to the adoption of these standards and, therefore, such information presented prior to January 1, 2018 continue to be reported under the Company’s previous accounting policies.

The following areas are impacted by the adoption of Topic 606:

The Company earns commissions and fees paid by insurance carriers for the binding of insurance coverage. These commissions and fees are earned at a point in time upon the effective date of bound insurance coverage, as no performance obligation exists after coverage is bound. If there are other services within the contract, the Company estimates the stand-alone selling price for each separate performance obligation, and the corresponding apportioned revenue is recognized over the period of time in which the customer receives the service, and as the performance obligations are fulfilled and the Company is entitled to that portion of revenue using the output method for the services. In situations where multiple performance obligations exist within a contract, the use of estimates is required to allocate the transaction price on a relative stand-alone selling price basis to each separate performance obligation.

Commission revenues - Prior to the adoption of Topic 606, commission revenues, including those billed on an installment basis, were recognized on the latter of the policy effective date or the date that the premium was billed to the client, with the exception of the Company’s Arrowhead businesses, which followed a policy of recognizing these revenues on the latter of the policy effective date or processed date in our systems. As a result of the adoption of Topic 606, commission revenues associated with the issuance of policies are now recognized upon the effective date of the associated policy. The overall impact of these changes are not significant on a full-year basis, but the timing of recognizing revenue has impacted our fiscal quarters when compared to prior years. These commission revenues, including those billed on an installment basis, are now recognized earlier than they had been previously. Revenue is now accrued based upon the completion of the performance obligation, thereby creating a current asset for the unbilled revenue, until such time as an invoice is generated, which typically does not exceed twelve months. For the year ended December 31, 2018, the adoption of Topic 606 increased base and incentive commissions

revenue, as defined in Note 2, by $9.9 million compared to what would have been recognized under the Company’s previous accounting policies. Incentive commissions represent a form of variable consideration which includes additional commissions over base commissions received from insurance carriers based on predetermined production levels mutually agreed upon by both parties.

Profit-sharing contingent commissions - Prior to the adoption of Topic 606, revenue that was not fixed and determinable because a contingency existed was not recognized until the contingency was resolved. Under Topic 606, the Company must estimate the amount of consideration that will be received in the coming year such that a significant reversal of revenue is not probable. Profit-sharing contingent commissions represent a form of variable consideration associated with the placement of coverage, for which we earn commissions and fees. In connection with Topic 606, profit-sharing contingent commissions are estimated with a constraint applied and accrued relative to the recognition of the corresponding core commissions. The resulting effect on the timing of recognizing profit-sharing contingent commissions will now more closely follow a similar pattern as our commissions and fees with any true-ups recognized when payments are received or as additional information that affects the estimate becomes available. For the year ended December 31, 2018, the adoption of Topic 606 reduced profit-sharing contingent commissions revenue by $2.3 million compared to what would have been recognized under our previous accounting policies.

Fee revenues - The Company earns fee revenue related to services other than securing insurance coverage, which are predominantly in the Company’s National Programs and Services Segments, and to a lesser extent in the large accounts businesses within the Company’s Retail Segment, where the Company receives negotiated fees in lieu of a commission. In accordance with Topic 606, fee revenue from fee agreements are recognized in earlier periods and others in later periods as compared to our previous accounting treatment depending on when the services within the contract are satisfied and when we have transferred control of the related services to the customer. The overall impact of these changes is not significant on a full-year basis, but the timing of recognizing fees revenue will impact our fiscal quarters when compared to prior years. For the year ended December 31, 2018, the adoption of Topic 606 increased fees revenue by $6.2 million compared to what would have been recognized under our previous accounting policies, including a one-time $10.5 million increase for revenues within our Services Segment. Excluding this increase, fee revenues would have decreased by $4.3 million.

Additionally, the Company has evaluated ASC Topic 340 - Other Assets and Deferred Cost (“ASC 340”) which requires companies to defer certain incremental cost to obtain customer contracts, and certain costs to fulfill customer contracts.

Incremental cost to obtain - The adoption of ASC 340 resulted in the Company deferring certain costs to obtain customer contracts primarily as they relate to commission-based compensation plans in the Retail Segment, in which the Company pays an incremental amount of compensation on new business. These incremental costs are deferred and amortized over a 15-year period, which is consistent with the analysis performed on acquired customer accounts and referenced in Note 5 to the Company’s consolidated financial statements. For incremental costs with an amortization period of less than 12 months, the costs are expensed as incurred. For the year ended December 31, 2018, the Company deferred $13.7 million of incremental cost to obtain customer contracts. The Company expensed $0.5 million of the incremental cost to obtain customer contracts for the year ended December 31, 2018.

Cost to fulfill - The adoption of ASC 340 resulted in the Company deferring certain costs to fulfill contracts and to recognize these costs as the associated performance obligations are fulfilled. In order for contract fulfillment costs to be deferred under ASC 340, the costs must (1) relate directly to a specific contract or anticipated contract, (2) generate or enhance resources that the Company will use in satisfying its obligations under the contract, and (3) be expected to be recovered through sufficient net cash flows from the contract. The Company does not expect the overall impact of these changes to be significant on a full-year basis, but the timing of recognizing these expenses will impact quarterly results compared to prior years as such recognition better aligns with the associated revenue. With the modified retrospective adoption of Topic 606, the Company deferred $52.7 million in contract fulfillment costs on its opening balance sheet on January 1, 2018 based upon the estimated average time spent on policy renewals. For the year ended December 31, 2018, the Company had net expense of $1.3 million related to the release of previously deferred contract fulfillment costs associated with performance obligations that were satisfied in the period, net of current year deferrals for costs incurred that related to performance obligations yet to be fulfilled.

In connection with the implementation of Topic 606 and ASC 340, we modified, and in some instances instituted, additional accounting procedures, processes and internal controls. While the relative impacts of these standards to our revenue and expense streams are significant during a calendar year, we do not view these modifications and additions as a material change in our internal controls over financial reporting on a full year basis.

The cumulative effect of the changes made to our consolidated balance sheet as of January 1, 2018 for the adoption of Accounting Standards Update No. 2014-09, “Revenue from Contracts with Customers (Topic 606)” and ASC Topic 340 – Other Assets and Deferred Cost (the “New Revenue Standard”):



(in thousands)	Balance at December 31, 2017		Adjustments due to the New Revenue Standard		Balance at January 1, 2018
Balance Sheet
Assets:
Premiums, commissions and fees receivable	$	546,402	$	153,058	$	699,460
Other current assets	47,864		52,680		100,544

Liabilities:
Premiums payable to insurance companies	685,163		12,107		697,270
Accounts payable	64,177		8,747		72,924
Accrued expenses and other liabilities	228,748		22,794		251,542
Deferred income taxes, net	256,185		44,575		300,760

Shareholders' Equity:
Retained earnings	$	2,456,599	$	117,515	$	2,574,114

The $52.7 million adjustment to other current assets reflects the deferral of certain cost to fulfill contracts. The $12.1 million adjustment to premiums payable to insurance companies reflects the estimated amount payable to outside brokers on unbilled premiums, commissions and fees receivable. The $8.7 million adjustment to accounts payable and the $22.8 million adjustment to accrued expenses and other liabilities consists of commissions payable and deferred revenue, respectively.

The following table illustrates the impact of adopting the New Revenue Standard has had on our reported results in the consolidated statement of income.



	December 31, 2018
(in thousands)	As reported		Impact of adopting the New Revenue Standard			Balances without the New Revenue Standard
Statement of Income
Revenues:
Commissions and fees	$	2,009,857	$	18,399		$	1,991,458

Expenses:
Employee compensation and benefits	1,068,914		(8,835		)	1,077,749
Other operating expenses	332,118		10,621			321,497
Income taxes	118,207		4,246			113,961

Net income	$	344,255	$	12,367		$	331,888

Principles of Consolidation

The accompanying Consolidated Financial Statements include the accounts of Brown & Brown, Inc. and its subsidiaries. All significant intercompany account balances and transactions have been eliminated in the Consolidated Financial Statements.

Segment results for prior periods have been recast, where appropriate, to reflect the current year segmental structure. Certain reclassifications have been made to the prior year amounts reported in this Annual Report on Form 10-K in order to conform to the current year presentation.

Revenue Recognition

The Company earns commissions paid by insurance carriers for the binding of insurance coverage. Commissions are earned at a point in time upon the effective date of bound insurance coverage, as no performance obligation exists after coverage is bound. If there are other services within the contract, the Company estimates the stand-alone selling price for each separate performance obligation, and the corresponding apportioned revenue is recognized over a period of time as the performance obligations are fulfilled. The Company earns fee revenue by receiving negotiated fees in lieu of a commission and from services other than securing insurance coverage. Fee revenues from certain agreements are recognized depending on when the services within the contract are satisfied and when we have transferred control of the related services to the customer. In situations where multiple performance obligations exist within a fee contract, the use of estimates is required to allocate the transaction price on a relative stand-alone selling price basis to each separate performance obligation. Incentive commissions represent a form of variable consideration which includes additional commissions over base commissions received from insurance carriers based on predetermined production levels mutually agreed upon by both parties. Profit-sharing contingent commissions represent a form of variable consideration associated with the placement of coverage, for which we earn commissions. Profit-sharing contingent commissions and incentive commissions are estimated with a constraint applied and accrued relative to the recognition of the corresponding core commissions based on the amount of consideration that will be received in the coming year such that a significant reversal of revenue is not probable. Guaranteed supplemental commissions, a form of variable consideration, represent guaranteed fixed-base agreements in lieu of profit-sharing contingent commissions.

Management determines the policy cancellation reserve based upon historical cancellation experience adjusted for any known circumstances.

Use of Estimates

The preparation of the Consolidated Financial Statements in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, as well as disclosures of contingent assets and liabilities, at the date of the Consolidated Financial Statements, and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from those estimates.

Cash and Cash Equivalents

Cash and cash equivalents principally consist of demand deposits with financial institutions and highly liquid investments with quoted market prices having maturities of three months or less when purchased.

Restricted Cash and Investments, and Premiums, Commissions and Fees Receivable

In our capacity as an insurance agent or broker, the Company typically collects premiums from insureds and, after deducting the authorized commissions, remits the net premiums to the appropriate insurance company or companies. Accordingly, as reported in the Consolidated Balance Sheets, premiums are receivable from insureds. Unremitted net insurance premiums are held in a fiduciary capacity until the Company disburses them. Where allowed by law, the Company invests these unremitted funds only in cash, money market accounts, tax-free variable-rate demand bonds and commercial paper held for a short-term. In certain states in which the Company operates, the use and investment alternatives for these funds are regulated and restricted by various state laws and agencies. These restricted funds are reported as restricted cash and investments on the Consolidated Balance Sheets. The interest income earned on these unremitted funds, where allowed by state law, is reported as investment income in the Consolidated Statement of Income.

In other circumstances, the insurance companies collect the premiums directly from the insureds and remit the applicable commissions to the Company. Accordingly, as reported in the Consolidated Balance Sheets, commissions are receivables from insurance companies. Fees are primarily receivables due from customers.

Investments

Certificates of deposit, and other securities, having maturities of more than three months when purchased are reported at cost and are adjusted for other-than-temporary market value declines. The Company’s investment holdings include U.S. Government securities, municipal bonds, domestic corporate and foreign corporate bonds as well as short-duration fixed income funds. Investments within the portfolio or funds are held as available-for-sale and are carried at their fair value. Any gain/loss applicable from the fair value change is recorded, net of tax, as other comprehensive income within the equity section of the Consolidated Balance Sheet. Realized gains and losses are reported on the Consolidated Statement of Income, with the cost of securities sold determined on a specific identification basis.

Fixed Assets

Fixed assets, including leasehold improvements, are carried at cost, less accumulated depreciation and amortization. Expenditures for improvements are capitalized, and expenditures for maintenance and repairs are expensed to operations as incurred. Upon sale or retirement, the cost and related accumulated depreciation and amortization are removed from the accounts and the resulting gain or loss, if any, is reflected in other income. Depreciation has been determined using the straight-line method over the estimated useful lives of the related assets, which

range from 3 to 15 years. Leasehold improvements are amortized on the straight-line method over the shorter of the useful life of the improvement or the term of the related lease.

Goodwill and Amortizable Intangible Assets

All of our business combinations initiated after June 30, 2001 are accounted for using the acquisition method. Acquisition purchase prices are typically based upon a multiple of average annual operating profit earned over a period of 3 years within a minimum and maximum price range. The recorded purchase prices for all acquisitions consummated after January 1, 2009 include an estimation of the fair value of liabilities associated with any potential earn-out provisions. Subsequent changes in the fair value of earn-out obligations are recorded in the Consolidated Statement of Income when incurred.

The fair value of earn-out obligations is based upon the present value of the expected future payments to be made to the sellers of the acquired businesses in accordance with the provisions contained in the respective purchase agreements. In determining fair value, the acquired business’ future performance is estimated using financial projections developed by management for the acquired business and this estimate reflects market participant assumptions regarding revenue growth and/or profitability. The expected future payments are estimated on the basis of the earn-out formula and performance targets specified in each purchase agreement compared to the associated financial projections. These estimates are then discounted to present value using a risk-adjusted rate that takes into consideration the likelihood that the forecasted earn-out payments will be made.

Amortizable intangible assets are stated at cost, less accumulated amortization, and consist of purchased customer accounts and non-compete agreements. Purchased customer accounts and non-compete agreements are amortized on a straight-line basis over the related estimated lives and contract periods, which range from 3 to 15 years. Purchased customer accounts primarily consist of records and files that contain information about insurance policies and the related insured parties that are essential to policy renewals.

The excess of the purchase price of an acquisition over the fair value of the identifiable tangible and amortizable intangible assets is assigned to goodwill. While goodwill is not amortizable, it is subject to assessment at least annually, and more frequently in the presence of certain circumstances, for impairment by application of a fair value-based test. The Company compares the fair value of each reporting unit with its carrying amount to determine if there is potential impairment of goodwill. If the fair value of the reporting unit is less than its carrying value, an impairment loss is recorded to the extent that the fair value of the goodwill within the reporting unit is less than its carrying value. Fair value is estimated based upon multiples of earnings before interest, income taxes, depreciation, amortization and change in estimated acquisition earn-out payables (“EBITDAC”), or on a discounted cash flow basis. The Company completed its most recent annual assessment as of November 30, 2018 and determined that the fair value of goodwill significantly exceeded the carrying value of such assets. In addition, as of December 31, 2018, there are no accumulated impairment losses.

The carrying value of amortizable intangible assets attributable to each business or asset group comprising the Company is periodically reviewed by management to determine if there are events or changes in circumstances that would indicate that its carrying amount may not be recoverable. Accordingly, if there are any such changes in circumstances during the year, the Company assesses the carrying value of its amortizable intangible assets by considering the estimated future undiscounted cash flows generated by the corresponding business or asset group. Any impairment identified through this assessment may require that the carrying value of related amortizable intangible assets be adjusted. There were no impairments recorded for the years ended December 31, 2018, 2017 and 2016.

Income Taxes

The Company records income tax expense using the asset-and-liability method of accounting for deferred income taxes. Under this method, deferred tax assets and liabilities are recognized for the expected future tax consequences of temporary differences between the financial statement carrying values and the income tax bases of the Company’s assets and liabilities.

The Company files a consolidated federal income tax return and has elected to file consolidated returns in certain states. Deferred income taxes are provided for in the Consolidated Financial Statements and relate principally to expenses charged to income for financial reporting purposes in one period and deducted for income tax purposes in other periods.

Revenue Recognition (Notes)

12 Months Ended

Dec. 31, 2018

Revenue from External Customer [Line Items]

Disaggregation of Revenue [Table Text Block]

NOTE 2· Revenues

The following table presents the revenues disaggregated by revenue source:



	Twelve months ended December 31, 2018
(in thousands)	Retail		National Programs		Wholesale Brokerage		Services		Other			Total
Base commissions⁽¹⁾	$	811,820	$	324,168	$	226,117	$	—	$	(68	)	$	1,362,037
Fees⁽²⁾	148,121		144,195		50,571		189,041		(1,090		)	530,838
Incentive commissions⁽³⁾	48,698		1,543		864		—		41			51,146
Profit-sharing contingent commissions⁽⁴⁾	24,517		23,896		7,462		—		—			55,875
Guaranteed supplemental commissions⁽⁵⁾	8,535		76		1,350		—		—			9,961
Investment income⁽⁶⁾	2		506		165		205		1,868			2,746
Other income, net⁽⁷⁾	1,070		79		485		—		9			1,643
Total Revenues	$	1,042,763	$	494,463	$	287,014	$	189,246	$	760		$	2,014,246

(1)

Base commissions generally represent a percentage of the premium paid by an insured and are affected by fluctuations in both premium rate levels charged by insurance companies and the insureds’ underlying “insurable exposure units,” which are units that insurance companies use to measure or express insurance exposed to risk (such as property values, or sales and payroll levels) to determine what premium to charge the insured. Insurance companies establish these premium rates based upon many factors, including loss experience, risk profile and reinsurance rates paid by such insurance companies, none of which we control.


(2)	Fee revenues relate to fees for services other than securing coverage for our customers and fees negotiated in lieu of commissions.


(3)	Incentive commissions include additional commissions over base commissions received from insurance carriers based on predetermined production levels mutually agreed upon by both parties.


(4)	Profit-sharing contingent commissions are based primarily on underwriting results, but may also reflect considerations for volume, growth and/or retention.


(5)	Guaranteed supplemental commissions represent guaranteed fixed-base agreements in lieu of profit-sharing contingent commissions.


(6)	Investment income consists primarily of interest on cash and investments.


(7)	Other income consists primarily of legal settlements and other miscellaneous income.

Contract Assets and Liabilities

The balances of contract assets and contract liabilities arising from contracts with customers as of December 31, 2018 and 2017 were as follows:



(in thousands)	December 31, 2018		December 31, 2017⁽¹⁾
Contract assets	$	265,994	$	210,323
Contract liabilities	$	53,496	$	51,236


(1)	The balances as of December 31, 2017 reported in this footnote have been revised to reflect the impact of adopting the New Revenue Standard.

Unbilled receivables (contract assets) arise when the Company recognizes revenue for amounts which have not yet been billed in our systems. Deferred revenue (contract liabilities) relates to payments received in advance of performance under the contract before the transfer of a good or service to the customer.

As of December 31, 2018, deferred revenue consisted of $37.0 million as current portion to be recognized within one year and $16.5 million in long-term to be recognized beyond one year. As of December 31, 2017, deferred revenue consisted of $44.5 million as current portion to be recognized within one year and $6.7 million in long-term deferred revenue to be recognized beyond one year.

Contract assets and contract liabilities arising from acquisitions in 2018 were approximately $34.3 million and $3.3 million, respectively.

During the twelve months ended December 31, 2018, the amount of revenue recognized related to performance obligations satisfied in a previous period, inclusive of changes due to estimates, was approximately $8.9 million.

Net Income Per Share

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Net Income Per Share

Basic net income per share is computed based on the weighted average number of common shares (including participating securities) issued and outstanding during the period. Diluted net income per share is computed based on the weighted average number of common shares issued and outstanding plus equivalent shares, assuming the exercise of stock options. The dilutive effect of stock options is computed by application of the treasury-stock method. The weighted average number of common shares outstanding for 2016 and 2017 reflect the 2-for-1 stock split that occurred on March 28, 2018.

The following is a reconciliation between basic and diluted weighted average shares outstanding for the years ended December 31:



(in thousands, except per share data)	2018			2017⁽¹⁾			2016⁽¹⁾
Net income	$	344,255		$	399,630		$	257,491
Net income attributable to unvested awarded performance stock	(8,297		)	(9,746		)	(6,705		)
Net income attributable to common shares	$	335,958		$	389,884		$	250,786
Weighted average number of common shares outstanding – basic	277,663			279,394			279,558
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic	(6,692		)	(6,814		)	(7,280		)
Weighted average number of common shares outstanding for basic earnings per common share	270,971			272,580			272,278
Dilutive effect of stock options	4,550			5,006			3,330
Weighted average number of shares outstanding – diluted	275,521			277,586			275,608
Net income per share:
Basic	$	1.24		$	1.43		$	0.92
Diluted	$	1.22		$	1.40		$	0.91

(1)

The weighted average number of common shares outstanding for 2016 and 2017 reflect the 2-for-1 stock split that occurred on March 28, 2018.

Business Combinations

12 Months Ended

Dec. 31, 2018

Business Combinations [Abstract]

Business Combinations

During the year ended December 31, 2018, the Company acquired the assets and assumed certain liabilities of twenty insurance intermediaries, all the stock of three insurance intermediaries and one book of business (customer accounts). Additionally, miscellaneous adjustments were recorded to the purchase price allocation of certain prior acquisitions completed within the last twelve months as permitted by ASC Topic 805 - Business Combinations (“ASC 805”). Such adjustments are presented in the “Other” category within the following two tables. The recorded purchase price for all acquisitions includes an estimation of the fair value of liabilities associated with any potential earn-out provisions. Subsequent changes in the fair value of earn-out obligations will be recorded in the Consolidated Statement of Income when incurred.

The fair value of earn-out obligations is based upon the present value of the expected future payments to be made to the sellers of the acquired businesses in accordance with the provisions outlined in the respective purchase agreements. In determining fair value, the acquired business’s future performance is estimated using financial projections developed by management for the acquired business and reflects market participant assumptions regarding revenue growth and/or profitability. The expected future payments are estimated on the basis of the earn-out formula and performance targets specified in each purchase agreement compared to the associated financial projections. These payments are then discounted to present value using a risk-adjusted rate that takes into consideration the likelihood that the forecasted earn-out payments will be made.

Based upon the acquisition date and the complexity of the underlying valuation work, certain amounts included in the Company’s Consolidated Financial Statements may be provisional and thus subject to further adjustments within the permitted measurement period, as defined in ASC 805. For the year ended December 31, 2018, several adjustments were made within the permitted measurement period that resulted in an increase in the aggregate purchase price of the affected acquisitions of $21.4 thousand relating to the assumption of certain liabilities. These measurement period adjustments have been reflected as current period adjustments for the year ended December 31, 2018 in accordance with the guidance in ASU 2015-16 “Business Combinations.” The measurement period adjustments impacted goodwill, with no effect on earnings or cash in the current period.

Cash paid for acquisitions was $934.9 million and $41.5 million in the years ended December 31, 2018 and 2017, respectively. We completed twenty-three acquisitions (excluding book of business purchases) during the year ended December 31, 2018. We completed eleven acquisitions (excluding book of business purchases) during the year ended December 31, 2017.

The following table summarizes the purchase price allocations made as of the date of each acquisition for current year acquisitions and adjustments made during the measurement period for prior year acquisitions. During the measurement periods, the Company will adjust assets or liabilities if new information is obtained about facts and circumstances that existed as of the acquisition date that, if known, would have resulted in the recognition of those assets and liabilities as of that date. These adjustments are made in the period in which the amounts are determined and the current period income effect of such adjustments will be calculated as if the adjustments had been completed as of the acquisition date.



(in thousands)
Name	Business segment	Effective date of acquisition	Cash paid		Common Stock Issued		Other payable		Recorded earn-out payable		Net assets acquired		Maximum potential earn- out payable
Opus Advisory Group, LLC (Opus)	Retail	February 1, 2018	$	20,400	$	—	$	200	$	2,384	$	22,984	$	3,600
Kerxton Insurance Agency, Inc. (Kerxton)	Retail	March 1, 2018	13,176		—		1,490		2,080		16,746		2,920
Automotive Development Group, LLC (ADG)	Retail	May 1, 2018	29,471		—		559		17,545		47,575		20,000
Servco Pacific, Inc. (Servco)	Retail	June 1, 2018	76,245		—		—		934		77,179		7,000
Tower Hill Prime Insurance Company (Tower Hill)	National Programs	July 1, 2018	20,300		—		—		1,188		21,488		7,700
Health Special Risk, Inc. (HSR)	National Programs	July 1, 2018	20,132		—		—		1,991		22,123		9,000
Professional Disability Associates, LLC (PDA)	Services	July 1, 2018	15,025		—		—		9,818		24,843		17,975
Finance & Insurance Resources, Inc. (F&I)	Retail	September 1, 2018	44,940		—		410		9,121		54,471		19,500
Rodman Insurance Agency, Inc. (Rodman)	Retail	November 1, 2018	31,121		—		261		3,720		35,102		9,850
The Hays Group, Inc. et al (Hays)	Retail	November 16, 2018	605,000		100,000		—		19,600		724,600		25,000
Dealer Associates, Inc. (Dealer)	Retail	December 1, 2018	28,825		—		1,175		3,100		33,100		12,125
Other	Various	Various	30,293		—		1,367		5,896		37,556		12,998
Total			$	934,928	$	100,000	$	5,462	$	77,377	$	1,117,767	$	147,668

The following table summarizes the estimated fair values of the aggregate assets and liabilities acquired as of the date of each acquisition and adjustments made during the measurement period of the prior year acquisitions.



(in thousands)	Opus		Kerxton			ADG		Servco			Tower Hill		HSR			PDA			F&I		Rodman			Hays
Cash	$	—	$	—		$	—	$	8,188		$	—	$	3,114		$	(248	)	$	—	$	—		$	—
Other current assets	1,215		663			1,500		7,769			—		818			1,762			999		1,062			36,254
Fixed assets	11		10			67		179			$	—	$	124		$	310		$	34	$	45		$	4,936
Goodwill	16,414		12,423			35,769		54,429			—		18,737			16,547			36,423		26,572			456,217
Purchased customer accounts	5,008		4,712			9,751		16,442			21,468		5,516			7,700			16,611		10,129			218,600
Non-compete agreements	21		22			21		1			20		65			82			21		51			2,600
Other assets	315		419			467		1,478			—		21			6			383		542			13,977
Total assets acquired	22,984		18,249			47,575		88,486			21,488		28,395			26,159			54,471		38,401			732,584
Other current liabilities	—		(1,503		)	—		(11,307		)	—		(5,930		)	(1,093		)	—		(3,299		)	(7,984		)
Other liabilities	—		—			—		—			—		(342		)	(223		)	—		—			—
Total liabilities assumed	—		(1,503		)	—		(11,307		)	—		(6,272		)	(1,316		)	—		(3,299		)	(7,984		)
Net assets acquired	$	22,984	$	16,746		$	47,575	$	77,179		$	21,488	$	22,123		$	24,843		$	54,471	$	35,102		$	724,600



(in thousands)	Dealer			Other			Total
Cash	$	—		$	—		$	11,054
Other current assets	552			323			52,917
Fixed assets	13			100			5,829
Goodwill	21,467			22,712			717,710
Purchased customer accounts	10,986			15,085			342,008
Non-compete agreements	21			297			3,222
Other assets	226			754			18,588
Total assets acquired	33,265			39,271			1,151,328
Other current liabilities	(165		)	(1,715		)	(32,996		)
Other liabilities	—			—			(565		)
Total liabilities assumed	(165		)	(1,715		)	(33,561		)
Net assets acquired	$	33,100		$	37,556		$	1,117,767

The weighted average useful lives for the acquired amortizable intangible assets are as follows: purchased customer accounts, 15 years; and non-compete agreements, 5 years.

Goodwill of $717.7 million, which is net of any opening balance sheet adjustments within the allowable measurement period, was allocated to the Retail, National Programs, Wholesale Brokerage and Services Segments in the amounts of $676.9 million, $18.7 million, $5.5 million and $16.5 million, respectively. Of the total goodwill of $717.7 million, the amount currently deductible for income tax purposes is $640.3 million and the remaining $77.4 million relates to the recorded earn-out payables and will not be deductible until it is earned and paid.

For the acquisitions completed during 2018, the results of operations since the acquisition dates have been combined with those of the Company. The total revenues from the acquisitions completed through December 31, 2018 included in the Consolidated Statement of Income for the year ended December 31, 2018 were $82.4 million. The income before income taxes, including the intercompany cost of capital charge, from the acquisitions completed through December 31, 2018 included in the Consolidated Statement of Income for the year ended December 31, 2018 was $6.3 million. If the acquisitions had occurred as of the beginning of the respective periods, the Company’s results of operations would be as shown in the following table. These unaudited pro forma results are not necessarily indicative of the actual results of operations that would have occurred had the acquisitions actually been made at the beginning of the respective periods.



(UNAUDITED)	Year Ended December 31,
(in thousands, except per share data)	2018		2017
Total revenues	$	2,259,812	$	2,193,169
Income before income taxes	$	504,664	$	503,927
Net income	$	375,670	$	447,796
Net income per share:
Basic	$	1.35	$	1.60
Diluted	$	1.33	$	1.57
Weighted average number of shares outstanding:
Basic	270,971		272,580
Diluted	275,521		277,586

Acquisitions in 2017

During the year ended December 31, 2017, the Company acquired the assets and assumed certain liabilities of eleven insurance intermediaries and one book of business (customer accounts). Additionally, miscellaneous adjustments were recorded to the purchase price allocation of certain prior acquisitions completed within the last twelve months as permitted by ASC 805. Such adjustments are presented in the “Other” category within the following two tables.

For the year ended December 31, 2017, several adjustments were made within the permitted measurement period that resulted in a decrease in the aggregate purchase price of the affected acquisitions of $1.5 million, relating to the assumption of certain liabilities.

The following table summarizes the purchase price allocation made as of the date of each acquisition for current year acquisitions and significant adjustments made during the measurement period for prior year acquisitions:



(in thousands)
Name	Business Segment	Effective Date of Acquisition	Cash Paid		Other Payable		Recorded Earn-Out Payable		Net Assets Acquired		Maximum Potential Earn- Out Payable
Other	Various	Various	$	41,471	$	11,708	$	6,921	$	60,100	$	27,451
Total			$	41,471	$	11,708	$	6,921	$	60,100	$	27,451

The following table summarizes the estimated fair values of the aggregate assets and liabilities acquired as of the date of each acquisition.



(in thousands)	Total
Other current assets	$	601
Fixed assets	69
Goodwill	42,172
Purchased customer accounts	18,738
Non-compete agreements	721
Total assets acquired	62,301
Other current liabilities	(1,512		)
Deferred income tax, net	(689		)
Total liabilities assumed	(2,201		)
Net assets acquired	$	60,100

The weighted average useful lives for the acquired amortizable intangible assets are as follows: purchased customer accounts, 15.0 years; and non-compete agreements, 5.0 years.

Goodwill of $42.2 million was allocated to the Retail, National Programs, Wholesale Brokerage and Services Segments in the amounts of $33.1 million, $7.2 million, $1.2 million and $0.7 million, respectively. Of the total goodwill of $42.2 million, $35.3 million is currently deductible for income tax purposes. The remaining $6.9 million relates to the recorded earn-out payables and will not be deductible until it is earned and paid.

For the acquisitions completed during 2017, the results of operations since the acquisition dates have been combined with those of the Company. The total revenues from the acquisitions completed through December 31, 2017 included in the Consolidated Statement of Income for the year ended December 31, 2017 were $7.8 million. The income before income taxes, including the intercompany cost of capital charge, from the acquisitions completed through December 31, 2017 included in the Consolidated Statement of Income for the year ended December 31, 2017 was $2.4 million. If the acquisitions had occurred as of the beginning of the respective periods, the Company’s results of operations would be as shown in the following table. These unaudited pro forma results are not necessarily indicative of the actual results of operations that would have occurred had the acquisitions actually been made at the beginning of the respective periods.



(UNAUDITED)	Year Ended December 31,
(in thousands, except per share data)	2017		2016
Total revenues	$	1,891,701	$	1,784,776
Income before income taxes	$	453,397	$	429,490
Net income	$	401,908	$	261,133
Net income per share:
Basic	$	1.44	$	0.93
Diluted	$	1.41	$	0.92
Weighted average number of shares outstanding:
Basic	272,580		272,278
Diluted	277,586		275,608

Acquisitions in 2016

During the year ended December 31, 2016, the Company acquired the assets and assumed certain liabilities of seven insurance intermediaries, all of the stock of one insurance intermediary and three books of business (customer accounts). Additionally, miscellaneous adjustments were recorded to the purchase price allocation of certain prior acquisitions completed within the last twelve months as permitted by ASC 805. Such adjustments are presented in the “Other” category within the following two tables.

For the year ended December 31, 2016, several adjustments were made within the permitted measurement period that resulted in a decrease in the aggregate purchase price of the affected acquisitions of $917,497, relating to the assumption of certain liabilities.



(in thousands)
Name	Business Segment	Effective Date of Acquisition	Cash Paid		Note Payable		Other Payable		Recorded Earn-Out Payable		Net Assets Acquired		Maximum Potential Earn- Out Payable
Social Security Advocates for the Disabled LLC (SSAD)	Services	February 1, 2016	$	32,526	$	492	$	—	$	971	$	33,989	$	3,500
Morstan General Agency, Inc. (Morstan)	Wholesale Brokerage	June 1, 2016	66,050		—		10,200		3,091		79,341		5,000
Other	Various	Various	26,140		—		464		400		27,004		7,785
Total			$	124,716	$	492	$	10,664	$	4,462	$	140,334	$	16,285

The following table summarizes the estimated fair values of the aggregate assets and liabilities acquired as of the date of each acquisition.



(in thousands)	SSAD			Morstan			Other			Total
Cash	$	2,094		$	—		$	—		$	2,094
Other current assets	1,042			2,482			1,555			5,079
Fixed assets	307			300			77			684
Goodwill	22,352			51,454			19,570			93,376
Purchased customer accounts	13,069			26,481			11,075			50,625
Non-compete agreements	72			39			117			228
Other assets	—			—			20			20
Total assets acquired	38,936			80,756			32,414			152,106
Other current liabilities	(1,717		)	(1,415		)	(5,410		)	(8,542		)
Deferred income tax, net	(3,230		)	—			—			(3,230		)
Total liabilities assumed	(4,947		)	(1,415		)	(5,410		)	(11,772		)
Net assets acquired	$	33,989		$	79,341		$	27,004		$	140,334

The weighted average useful lives for the acquired amortizable intangible assets are as follows: purchased customer accounts, 15 years; and non-compete agreements, 5 years.

Goodwill of $93.4 million was allocated to the Retail, National Programs, Wholesale Brokerage and Services Segments in the amounts of $13.1 million, $(1.2) thousand, $57.9 million and $22.4 million, respectively. Of the total goodwill of $93.4 million, $88.9 million is currently deductible for income tax purposes. The remaining $4.5 million relates to the recorded earn-out payables and will not be deductible until it is earned and paid.

For the acquisitions completed during 2016, the results of operations since the acquisition dates have been combined with those of the Company. The total revenues from the acquisitions completed through December 31, 2016 included in the Consolidated Statement of Income for the year ended December 31, 2016 were $34.2 million. The income before income taxes, including the intercompany cost of capital charge, from the acquisitions completed through December 31, 2016 included in the Consolidated Statement of Income for the year ended December 31, 2016 was $4.3 million. If the acquisitions had occurred as of the beginning of the respective periods, the Company’s results of operations would be as shown in the following table. These unaudited pro forma results are not necessarily indicative of the actual results of operations that would have occurred had the acquisitions actually been made at the beginning of the respective periods.



(UNAUDITED)	Year Ended December 31,
(in thousands, except per share data)	2016		2015
Total revenues	$	1,789,790	$	1,716,592
Income before income taxes	$	428,194	$	414,911
Net income	$	260,346	$	250,783
Net income per share:
Basic	$	0.93	$	0.89
Diluted	$	0.92	$	0.87
Weighted average number of shares outstanding:
Basic	272,278		275,620
Diluted	275,608		280,224

As of December 31, 2018, the maximum future contingency payments related to all acquisitions totaled $198.6 million, all of which relates to acquisitions consummated subsequent to January 1, 2009.

ASC 805 is the authoritative guidance requiring an acquirer to recognize 100% of the fair values of acquired assets, including goodwill, and assumed liabilities (with only limited exceptions) upon initially obtaining control of an acquired entity. Additionally, the fair value of contingent consideration arrangements (such as earn-out purchase arrangements) at the acquisition date must be included in the purchase price consideration. As a result, the recorded purchase prices for all acquisitions consummated after January 1, 2009 include an estimation of the fair value of liabilities associated with any potential earn-out provisions. Subsequent changes in these earn-out obligations will be recorded in the Consolidated Statement of Income when incurred. Potential earn-out obligations are typically based upon future earnings of the acquired entities, usually between one and three years.

As of December 31, 2018, the fair values of the estimated acquisition earn-out payables were re-evaluated and measured at fair value on a recurring basis using unobservable inputs (Level 3) as defined in ASC 820-Fair Value Measurement. The resulting additions, payments and net changes, as well as the interest expense accretion on the estimated acquisition earn-out payables, for the years ended December 31, 2018, 2017 and 2016 were as follows:



	Year Ended December 31,
(in thousands)	2018			2017			2016
Balance as of the beginning of the period	$	36,175		$	63,821		$	78,387
Additions to estimated acquisition earn-out payables	77,377			6,920			4,462
Payments for estimated acquisition earn-out payables	(26,597		)	(43,766		)	(28,213		)
Subtotal	86,955			26,975			54,636
Net change in earnings from estimated acquisition earn-out payables:
Change in fair value on estimated acquisition earn-out payables	603			6,874			6,338
Interest expense accretion	2,366			2,326			2,847
Net change in earnings from estimated acquisition earn-out payables	2,969			9,200			9,185
Balance as of December 31,	$	89,924		$	36,175		$	63,821

Of the $89.9 million of estimated acquisition earn-out payables as of December 31, 2018, $21.1 million was recorded as accounts payable, and $68.8 million was recorded as another non-current liability. Included within additions to estimated acquisition earn-out payables are any adjustments to opening balance sheet items prior to the one-year anniversary date of the acquisition and may therefore differ from previously reported amounts. Of the $36.2 million of estimated acquisition earn-out payables as of December 31, 2017, $25.1 million was recorded as accounts payable, and $11.1 million was recorded as other non-current liabilities. Of the $63.8 million of estimated acquisition earn-out payables as of December 31, 2016, $31.8 million was recorded as accounts payable, and $32.0 million was recorded as other non-current liabilities.

Goodwill

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

The changes in the carrying value of goodwill by reportable segment for the years ended December 31, are as follows:



(in thousands)	Retail			National Programs			Wholesale Brokerage		Services		Total
Balance as of January 1, 2017	$	1,354,667		$	901,294		$	284,869	$	134,572	$	2,675,402
Goodwill of acquired businesses	33,076			7,178			1,229		689		42,172
Goodwill disposed of relating to sales of businesses	(1,495		)	—			—		—		(1,495		)
Balance as of December 31, 2017	$	1,386,248		$	908,472		$	286,098	$	135,261	$	2,716,079
Goodwill of acquired businesses	676,902			18,737			5,524		16,547		717,710
Goodwill disposed of relating to sales of businesses	—			(1,003		)	—		—		(1,003		)
Balance as of December 31, 2018	$	2,063,150		$	926,206		$	291,622	$	151,808	$	3,432,786

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Amortizable Intangible Assets

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Amortizable Intangible Assets

Amortizable intangible assets at December 31, 2018 and 2017 consisted of the following:



	December 31, 2018								December 31, 2017
(in thousands)	Gross carrying value		Accumulated amortization			Net carrying value		Weighted average life in years⁽¹⁾	Gross carrying value		Accumulated amortization			Net carrying value		Weighted average life in years⁽¹⁾
Purchased customer accounts	$	1,804,404	$	(909,415	)	$	894,989	14.9	$	1,464,274	$	(824,584	)	$	639,690	15.0
Non-compete agreements	33,469		(29,651		)	3,818		4.5	30,287		(28,972		)	1,315		4.6
Total	$	1,837,873	$	(939,066	)	$	898,807		$	1,494,561	$	(853,556	)	$	641,005


(1)	Weighted average life calculated as of the date of acquisition.

Amortization expense for amortizable intangible assets for the years ending December 31, 2019, 2020, 2021, 2022 and 2023 is estimated to be $100.4 million, $93.0 million, $89.5 million, $85.0 million and $78.0 million, respectively.

Investments

12 Months Ended

Dec. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Investments

At December 31, 2018, the Company’s amortized cost and fair values of fixed maturity securities are summarized as follows:



(in thousands)	Cost		Gross unrealized gains		Gross unrealized losses			Fair value
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities	$	21,729	$	7	$	(222	)	$	21,514
Corporate debt	623		—		—			623
Total	$	22,352	$	7	$	(222	)	$	22,137

At December 31, 2018, the Company held $21.7 million in fixed income securities composed of U.S Treasury securities, securities issued by U.S. Government agencies and Municipalities, and $0.6 million issued by corporations with investment-grade ratings. Of the total, $4.8 million is classified as short-term investments on the Consolidated Balance Sheet as maturities are less than one year in duration. Additionally, the Company holds $8.1 million in short-term investments, which are related to time deposits held with various financial institutions.

For securities in a loss position, the following table shows the investments’ gross unrealized loss and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of December 31, 2018:



(in thousands)	Less than 12 Months					12 Months or More					Total
	Fair value		Unrealized losses			Fair value		Unrealized losses			Fair value		Unrealized losses
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities	$	5,866	$	(6	)	$	12,634	$	(216	)	$	18,500	$	(222	)
Corporate debt	457		—			100		—			557		—
Total	$	6,323	$	(6	)	$	12,734	$	(216	)	$	19,057	$	(222	)

The unrealized losses from corporate issuers were caused by interest rate increases. At December 31, 2018, the Company had 20 securities in an unrealized loss position. The corporate securities are highly rated securities with no indicators of potential impairment. Based upon the ability and intent of the Company to hold these investments until recovery of fair value, which may be maturity, the bonds were not considered to be other-than-temporarily impaired at December 31, 2018.

At December 31, 2017, the Company’s amortized cost and fair values of fixed maturity securities are summarized as follows:



(in thousands)	Cost		Gross unrealized gains		Gross unrealized losses			Fair value
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities	$	29,970	$	—	$	(206	)	$	29,764
Corporate debt	1,072		12		—			1,084
Total	$	31,042	$	12	$	(206	)	$	30,848

The following table shows the investments’ gross unrealized loss and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of December 31, 2017:



(in thousands)	Less than 12 Months					12 Months or More					Total
	Fair value		Unrealized losses			Fair value		Unrealized losses			Fair value		Unrealized losses
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities	$	17,919	$	(157	)	$	11,845	$	(49	)	$	29,764	$	(206	)
Corporate debt	400		—			—		—			400		—
Total	$	18,319	$	(157	)	$	11,845	$	(49	)	$	30,164	$	(206	)

The unrealized losses in the Company’s investments in U.S. Treasury Securities and obligations of U.S. Government Agencies and bonds from corporate issuers were caused by interest rate increases. At December 31, 2017, the Company had 27 securities in an unrealized loss position. The contractual cash flows of the U.S. Treasury Securities and obligations of the U.S. Government agencies investments are either guaranteed by the U.S. Government or an agency of the U.S. Government. Accordingly, it is expected that the securities would not be settled at a price less than the amortized cost of the Company’s investment. The corporate securities are highly rated securities with no indicators of potential impairment. Based upon the ability and intent of the Company to hold these investments until recovery of fair value, which may be maturity, the bonds were not considered to be other-than-temporarily impaired at December 31, 2017.

The amortized cost and estimated fair value of the fixed maturity securities at December 31, 2018 by contractual maturity are set forth below:



(in thousands)	Amortized cost		Fair value
Years to maturity:
Due in one year or less	$	4,768	$	4,743
Due after one year through five years	17,584		17,394
Due after five years through ten years	—		—
Total	$	22,352	$	22,137

The amortized cost and estimated fair value of the fixed maturity securities at December 31, 2017 by contractual maturity are set forth below:



(in thousands)	Amortized cost		Fair value
Years to maturity:
Due in one year or less	$	16,934	$	16,899
Due after one year through five years	13,876		13,708
Due after five years through ten years	232		241
Total	$	31,042	$	30,848

The expected maturities in the foregoing table may differ from the contractual maturities because certain borrowers have the right to call or prepay obligations with or without penalty.

Proceeds from the sales and maturity of the Company’s investment in fixed maturity securities were $17.1 million. This along with maturing time deposits yielded total cash proceeds from the sale of investments of $17.9 million in the period of January 1, 2018 to December 31, 2018. These proceeds were used to purchase an additional $9.3 million of fixed maturity securities and to fund certain general corporate purposes. The gains and losses realized on those sales for the period from January 1, 2018 to December 31, 2018 were insignificant.

Proceeds from the sales and maturity of the Company’s investment in fixed maturity securities were $5.8 million for the year ended December 31, 2017. This along with maturing time deposits yielded total cash proceeds from the sale of investments of $9.6 million in the period of January 1, 2017 to December 31, 2017. These proceeds were used to purchase additional fixed- maturity securities. The gains and losses realized on those sales for the period from January 1, 2017 to December 31, 2017 were insignificant.

Realized gains and losses are reported on the Consolidated Statement of Income, with the cost of securities sold determined on a specific identification basis.

At December 31, 2018, investments with a fair value of approximately $4.1 million were on deposit with state insurance departments to satisfy regulatory requirements.

Fixed Assets (Notes)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment Disclosure [Text Block]

Fixed Assets

Fixed assets at December 31 consisted of the following:



(in thousands)	2018			2017
Furniture, fixtures and equipment	$	213,928		$	190,784
Leasehold improvements	39,194			35,481
Construction in progress	7,568			—
Land, buildings and improvements	8,185			7,643
Total cost	268,875			233,908
Less accumulated depreciation and amortization	(168,480		)	(156,822		)
Total	$	100,395		$	77,086

Depreciation and amortization expense for fixed assets amounted to $22.8 million in 2018, $22.7 million in 2017 and $21.0 million in 2016.

Long-Term Debt

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Long-Term Debt

Long-term debt at December 31, 2018 and 2017 consisted of the following:



(in thousands)	December 31, 2018			December 31, 2017
Current portion of long-term debt:
Current portion of 5-year term loan facility expires 2022	$	35,000		$	20,000
4.500% Senior Notes, Series E, quarterly interest payments, balloon due 2018	—			100,000
Current portion of 5-year term loan credit agreement expires 2023	15,000			—
Total current portion of long-term debt	50,000			120,000
Long-term debt:
Note agreements:
4.200% Senior Notes, semi-annual interest payments, balloon due 2024	499,101			498,943
Total notes	499,101			498,943
Credit agreements:
5-year term loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires June 28, 2022	330,000			365,000
5-year revolving loan facility, periodic interest payments, currently LIBOR plus up to 1.500%, plus commitment fees up to 0.250%, expires June 28, 2022	350,000			—
5-year term loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires December 21, 2023	$	285,000		$	—
Total credit agreements	965,000			365,000
Debt issuance costs (contra)	(7,111		)	(7,802		)
Total long-term debt less unamortized discount and debt issuance costs	1,456,990			856,141
Current portion of long-term debt	50,000			120,000
Total debt	$	1,506,990		$	976,141

On December 22, 2006, the Company entered into a Master Shelf and Note Purchase Agreement (the “Master Agreement”) with a national insurance company (the “Purchaser”). The initial issuance of notes under the Master Agreement occurred on December 22, 2006, through the issuance of $25.0 million in Series C Senior Notes due December 22, 2016, with a fixed interest rate of 5.660% per year. On February 1, 2008, $25.0 million in Series D Senior Notes due January 15, 2015, with a fixed interest rate of 5.370% per year, were issued. On September 15, 2011, and pursuant to a Confirmation of Acceptance (the “Confirmation”), dated January 21, 2011, in connection with the Master Agreement, $100.0 million in Series E Senior Notes were issued and was due September 15, 2018, with a fixed interest rate of 4.500% per year. The Series E Senior Notes were issued for the sole purpose of retiring existing Senior Notes. On January 15, 2015, the Series D Notes were redeemed at maturity using cash proceeds to pay off the principal of $25.0 million plus any remaining accrued interest. On December 22, 2016, the Series C Notes were redeemed at maturity using cash proceeds to pay off the principal of $25.0 million plus any remaining accrued interest. On May 10, 2018, the principal balance of $100.0 million from the Series E Senior Notes was paid in full, along with accrued interest of $0.7 million and a prepayment premium of $0.7 million. As of December 31, 2018, there was no outstanding debt balance issued under the provisions of the Master Agreement, which is fully terminated with the Series E Senior Notes maturing.

On April 17, 2014, the Company entered into a credit agreement with JPMorgan Chase Bank, N.A. as administrative agent and certain other banks as co-syndication agents and co-documentation agents (the “Credit Agreement”). The Credit Agreement in the amount of $1,350.0 million provides for an unsecured revolving credit facility (the “Credit Facility”) in the initial amount of $800.0 million and unsecured term loans in the initial amount of $550.0 million, either or both of which may, subject to lenders’ discretion, potentially be increased by up to $500.0 million. The Credit Facility was funded on May 20, 2014 in conjunction with the closing of the Wright acquisition, with the $550.0 million term loan being funded as well as a drawdown of $375.0 million on the revolving loan facility. Use of these proceeds was to retire existing term loan debt and to facilitate the closing of the Wright acquisition as well as other acquisitions. The Credit Facility terminates on May 20, 2019, but either or both of the revolving credit facility and the term loans may be extended for two additional one year periods at the Company’s request and at the discretion of the respective lenders. Interest and facility fees in respect to the Credit Facility are based upon the better of the Company’s net debt leverage ratio or a non-credit enhanced senior unsecured long-term debt rating. Based upon the Company’s net debt leverage ratio, the rates of interest charged on the term loan are 1.000% to 1.750%, and the revolving loan is 0.850% to 1.500% above the adjusted LIBOR rate for outstanding amounts drawn. There are fees included in the facility which include a facility fee based upon the revolving credit commitments of the lenders (whether used or unused) at a rate of 0.150% to 0.250% and letter of credit fees based upon the amounts of outstanding secured or unsecured letters of credit. The Credit Facility includes various covenants, limitations and events of default customary for similar facilities for similarly rated borrowers.

On June 28, 2017, the Company entered into an amended and restated credit agreement (the “Amended and Restated Credit Agreement”) with the lenders named therein, JPMorgan Chase Bank, N.A. as administrative agent and certain other banks as co-syndication agents and co-documentation agents. The Amended and Restated Credit Agreement amended and restated the credit agreement dated April 17, 2014, among such parties (the “Original Credit Agreement”). The Amended and Restated Credit Agreement extends the applicable maturity date of the existing revolving credit facility (the “Facility”) of $800.0 million to June 28, 2022 and re-evidences unsecured term loans at $400.0 million, while also extending the applicable maturity date to June 28, 2022. The quarterly term loan principal amortization schedule was reset. At the time of the execution of the Amended and Restated Credit Agreement, $67.5 million of principal from the original unsecured term loans was repaid using operating cash balances, and the Company added an additional $2.8 million in debt issuance costs related to the Facility to the Consolidated Balance Sheet. The Company also expensed to the Consolidated Statements of Income $0.2 million of debt issuance costs related to the Original Credit Agreement due to certain lenders exiting prior to execution of the Amended and Restated Credit Agreement. The Company also carried forward $1.6 million on the Consolidated Balance Sheet the remaining unamortized portion of the Original Credit Agreement debt issuance costs, which will be amortized over the term of the Amended and Restated Credit Agreement. On December 31, 2018, the Company made a scheduled principal payment of $5.0 million per the terms of the Amended and Restated Credit Agreement. As of December 31, 2018, there was an outstanding debt balance issued under the term loan of the Amended and Restated Credit Agreement of $365.0 million with $350.0 million in borrowings outstanding against the Facility. The Company had borrowed approximately $600.0 million under its Revolving Credit Facility on November 15, 2018 in connection with the closing of the acquisition of certain assets and assumption of certain liabilities of the Hays Companies. Per the terms of the Amended and Restated Credit Agreement, a scheduled principal payment of $5.0 million is due March 31, 2019.

On September 18, 2014, the Company issued $500.0 million of 4.200% unsecured Senior Notes due in 2024. The Senior Notes were given investment grade ratings of BBB-/Baa3 with a stable outlook. The notes are subject to certain covenant restrictions and regulations which are customary for credit rated obligations. At the time of funding, the proceeds were offered at a discount of the original note amount which also excluded an underwriting fee discount. The net proceeds received from the issuance were used to repay the outstanding balance of $475.0 million on the revolving Credit Facility and for other general corporate purposes. As of December 31, 2018 and 2017, there was an outstanding debt balance of $500.0 million exclusive of the associated discount balance.

On December 21, 2018, the Company entered into a term loan credit agreement (the “Term Loan Credit Agreement”) with the lenders named therein, Wells Fargo Bank, National Association, as administrative agent, and certain other banks as co-syndication agents and as joint lead arrangers and joint bookrunners. The Term Loan Credit Agreement provides for an unsecured term loan in the initial amount of $300.0 million, which may, subject to lenders’ discretion, potentially be increased up to an aggregate amount of $450.0 million (the “Term Loan”). The Term Loan is repayable over the five-year term from the effective date of the Term Loan Credit Agreement, which was December 21, 2018.

Based on the Company’s net debt leverage ratio or a non-credit enhanced senior unsecured long-term debt rating as determined by Moody’s Investor Service and Standard & Poor’s Rating Service, the rates of interest charged on the term loan are 1.00% to 1.75%, above the adjusted 1-Month LIBOR rate. On December 21, 2018, the Company borrowed $300.0 million under the Term Loan Credit Agreement and used $250.0 million of the proceeds to reduce indebtedness under the Company’s Amended and Restated Credit Agreement, dated June 28, 2017, with the lenders named therein, JPMorgan Chase Bank, N.A., as administrative agent, and certain other banks as co-syndication agents and co-documentation agents (the “Revolving Credit Facility”). As of December 31, 2018, there was an outstanding debt balance issued under the term loan of the Term Loan Credit Agreement of $300.0 million. Per the terms of the Term Loan Credit Agreement, a scheduled principal payment of $3.8 million is due March 31, 2019.

The Master Agreement, Amended and Restated Credit Agreement and the Term Loan Credit Agreement require the Company to maintain certain financial ratios and comply with certain other covenants. The Company was in compliance with all such covenants as of December 31, 2018 and 2017.

The 30-day Adjusted LIBOR Rate for the term loan and Revolving Credit Facility of the Amended and Restated Credit Agreement and Term Loan Credit Agreement as of December 31, 2018 was 2.563%, 2.288%, and 2.500%, respectively.

Interest paid in 2018, 2017 and 2016 was $38.0 million, $36.2 million, and $37.7 million, respectively.

At December 31, 2018, maturities of long-term debt were $50.0 million in 2019, $55.0 million in 2020, $70.0 million in 2021, $630.0 million in 2022, $210.0 million in 2023 and $500.0 million in 2024.

Income Taxes (Notes)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Income Tax Disclosure [Text Block]

Income Taxes

On December 22, 2017, the U.S. government enacted the Tax Cuts and Jobs Act of 2017 (the “Tax Reform Act”). The Tax Reform Act makes changes to the U.S. tax code that affected our income tax rate in 2017. The Tax Reform Act reduces the U.S. federal corporate income tax rate from 35.0% to 21.0% and requires companies to pay a one-time transition tax on certain unrepatriated earnings from foreign subsidiaries. The Tax Reform Act also establishes new tax laws that became effective January 1, 2018.

ASC 740 requires a company to record the effects of a tax law change in the period of enactment, however, shortly after the enactment of the Tax Reform Act, the SEC staff issued SAB 118, which allows a company to record a provisional amount when it does not have the necessary information available, prepared, or analyzed in reasonable detail to complete its accounting for the change in the tax law. The measurement period ends when the company has obtained, prepared and analyzed the information necessary to finalize its accounting, but cannot extend beyond one year.

For 2017, we made a reasonable estimate of the impact of the Tax Reform Act and recorded a one-time credit in our 2017 income tax expense of $120.9 million, which reflects an estimated reduction in our deferred income tax liabilities of $124.2 million as a result of the maximum federal rate decreasing to 21.0% from 35.0%, which was partially offset by an estimated increase in income tax payable in the amount of $3.3 million as a result of the transition tax on cash and cash equivalent balances related to untaxed accumulated earnings associated with our international operations. During 2018, we made a credit adjustment to the transition tax on untaxed international operations in the amount of $1.6 million. This adjustment was a reduction of income tax expense for 2018 as a result of updated calculations based on the Company’s tax filings for the 2017 year end. As of December 31, 2018, management does not expect any further changes to the amounts previously recorded and adjusted under SAB 118.

Significant components of the provision for income taxes for the years ended December 31 are as follows:



(in thousands)	2018		2017			2016
Current:
Federal	$	77,694	$	129,954		$	126,145
State	25,096		21,392			21,110
Foreign	409		929			590
Total current provision	103,199		152,275			147,845
Deferred:
Federal	8,483		18,999			15,551
State	6,519		2,984			2,612
Foreign	6		—			—
Tax Reform Act deferred tax revaluation	—		(124,166		)	—
Total deferred provision	15,008		(102,183		)	18,163
Total tax provision	$	118,207	$	50,092		$	166,008

A reconciliation of the differences between the effective tax rate and the federal statutory tax rate for the years ended December 31 is as follows:



	2018	2017	2016
Federal statutory tax rate	21.0%	35.0%	35.0%
State income taxes, net of federal income tax benefit	5.7	3.8	3.9
Non-deductible employee stock purchase plan expense	0.2	0.3	0.3
Non-deductible meals and entertainment	0.3	0.3	0.3
Non-deductible officers’ compensation	0.3	—	—
Tax Reform Act deferred tax revaluation and transition tax impact	(0.3)	(26.9)	—
Other, net	(1.6)	(1.4)	(0.3)
Effective tax rate	25.6%	11.1%	39.2%

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the corresponding amounts used for income tax reporting purposes.

Significant components of the Company’s net deferred tax liabilities as of December 31 are as follows:



(in thousands)	2018			2017
Non-current deferred tax liabilities:
Intangible assets	$	334,200		$	306,351
Fixed assets	4,929			2,723
Impact of adoption of ASC 606 revenue recognition	29,729			—
Net unrealized holding (loss)/gain on available-for-sale securities	(78		)	(6		)
Total non-current deferred tax liabilities	368,780			309,068
Non-current deferred tax assets:
Deferred compensation	41,293			36,701
Accruals and reserves	10,455			7,534
Deferred profit-sharing contingent commissions	—			7,107
Net operating loss carryforwards	2,196			2,434
Valuation allowance for deferred tax assets	(896		)	(893		)
Total non-current deferred tax assets	53,048			52,883
Net non-current deferred tax liability	$	315,732		$	256,185

Income taxes paid in 2018, 2017 and 2016 were $110.6 million, $152.0 million and $143.1 million, respectively.

At December 31, 2018, the Company had net operating loss carryforwards of $0.1 million and $42.5 million for federal and state income tax reporting purposes, respectively, portions of which expire in the years 2019 through 2038. The federal carryforward is derived from insurance operations acquired by the Company in 2001. The state carryforward amount is derived from the operating results of certain subsidiaries and from the 2013 stock acquisition of Beecher Carlson Holdings, Inc.

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:



(in thousands)	2018			2017			2016
Unrecognized tax benefits balance at January 1	$	1,694		$	750		$	584
Gross increases for tax positions of prior years	594			1,070			412
Gross decreases for tax positions of prior years	(5		)	—			(41		)
Settlements	(644		)	(126		)	(205		)
Unrecognized tax benefits balance at December 31	$	1,639		$	1,694		$	750

The Company recognizes interest and penalties related to uncertain tax positions in income tax expense. As of December 31, 2018, 2017 and 2016 the Company had $197,205, $228,608 and $86,191 of accrued interest and penalties related to uncertain tax positions, respectively.

The total amount of unrecognized tax benefits that would affect the Company’s effective tax rate if recognized was $1.6 million as of December 31, 2018, $1.7 million as of December 31, 2017 and $0.8 million as of December 31, 2016. The Company does not expect its unrecognized tax benefits to change significantly over the next 12 months.

As a result of a 2006 Internal Revenue Service (“IRS”) audit, the Company agreed to accrue at each December 31, for tax purposes only, a known amount of profit-sharing contingent commissions represented by the actual amount of profit-sharing contingent commissions received in the first quarter of the related year, with a true-up adjustment to the actual amount received by the end of the following March. Since this method for tax purposes differed from the method used for book purposes, it resulted in a current deferred tax asset as of December 31, 2017 and 2016. As of January 1, 2018, pursuant to ASU 606, Revenue Recognition, the deferred tax asset was removed and was included in the Company’s overall beginning retained earnings adjustment per ASC 606. The Company will now follow book treatment for accrued profit-sharing contingent commissions.

The Company is subject to taxation in the United States and various state jurisdictions. The Company is also subject to taxation in the United Kingdom. In the United States, federal returns for fiscal years 2014 through 2018 remain open and subject to examination by the IRS. The Company files and remits state income taxes in various states where the Company has determined it is required to file state income taxes. The Company’s filings with those states remain open for audit for the fiscal years 2012 through 2018. In the United Kingdom, the Company’s filings remain open for audit for the fiscal years 2017 and 2018.

During 2017, the Company settled the previously disclosed IRS income tax audit of The Wright Insurance Group for the short period ended May 1, 2014. Pursuant to the agreement in which the Company acquired The Wright Insurance Group, the Company was fully indemnified for all audit-related assessments.

During 2018, the Company settled the previously disclosed State of Massachusetts income tax audit for the fiscal year 2013 through 2014. In addition, the Company is currently under audit in the states of Colorado, Illinois, Kansas, Massachusetts and New York for the fiscal years 2015 through 2017.

In general, it is our practice and intention to reinvest the earnings of our non-U.S. subsidiaries in those operations.

Employee Savings Plan (Notes)	12 Months Ended
Employee Savings Plan (Notes)	Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Compensation and Employee Benefit Plans [Text Block]	NOTE 11· Employee Savings PlanThe Company has an Employee Savings Plan (401(k)) in which substantially all employees with more than 30 days of service are eligible to participate. Under this plan, the Company makes matching contributions of up to 4.0% of each participant’s annual compensation. Prior to 2014, the Company’s matching contribution was up to 2.5% of each participant’s annual compensation with an additional discretionary profit-sharing contribution each year, which equaled 1.5% of each eligible employee’s compensation. The Company’s contribution expense to the plan totaled $22.8 million in 2018, $19.6 million in 2017 and $19.3 million in 2016.

Stock Based Compensation (Notes)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross

10,269,384

Disclosure of Compensation Related Costs, Share-based Payments [Text Block]

Stock-Based Compensation

Performance Stock Plan

In 1996, the Company adopted and the shareholders approved a performance stock plan, under which until the suspension of the plan in 2010, up to 28,800,000 Performance Stock Plan (“PSP”) shares could be granted to key employees contingent on the employees’ future years of service with the Company and other performance-based criteria established by the Compensation Committee of the Company’s Board of Directors. Before participants may take full title to Performance Stock, two vesting conditions must be met. Of the grants currently outstanding, specified portions satisfied the first condition for vesting based upon 20% incremental increases in the 20-trading-day average stock price of Brown & Brown’s common stock from the price on the business day prior to date of grant. Performance Stock that has satisfied the first vesting condition is considered “awarded shares.” Awarded shares are included as issued and outstanding common stock shares and are included in the calculation of basic and diluted net income per share. Dividends are paid on awarded shares and participants may exercise voting privileges on such shares. Awarded shares satisfy the second condition for vesting on the earlier of a participant’s: (i) 15 years of continuous employment with Brown & Brown from the date shares are granted to the participants (or, in the case of the July 2009 grant to Powell Brown, 20 years), (ii) attainment of age 64 (on a prorated basis corresponding to the number of years since the date of grant), or (iii) death or disability. On April 28, 2010, the PSP was suspended and any remaining authorized, but unissued shares, as well as any shares forfeited in the future, will be reserved for issuance under the 2010 Stock Incentive Plan (the “SIP”).

At December 31, 2018, 10,269,384 shares had been granted, net of forfeitures, under the PSP. As of December 31, 2018, 1,196,092 shares had met the first condition of vesting and had been awarded, and 9,073,292 shares had satisfied both conditions of vesting and had been distributed to participants. Of the shares that have not vested as of December 31, 2018, the initial stock prices ranged from $8.16 to $12.84.

The Company uses a path-dependent lattice model to estimate the fair value of PSP grants on the grant date.

A summary of PSP activity for the years ended December 31, 2018, 2017 and 2016 is as follows:



	Weighted- average grant date fair value		Granted shares		Awarded shares		Shares not yet awarded
Outstanding at January 1, 2016	$	4.52	3,204,428		3,188,428		16,000
Granted	$	—	—		—		—
Awarded	$	—	—		8,000		(8,000	)
Vested	$	3.19	(1,012,844	)	(1,012,844	)	—
Forfeited	$	5.26	(185,034	)	(177,034	)	(8,000	)
Outstanding at December 31, 2016	$	5.11	2,006,550		2,006,550		—
Granted	$	—	—		—		—
Awarded	$	—	—		—		—
Vested	$	4.81	(277,602	)	(277,602	)	—
Forfeited	$	5.24	(34,472	)	(34,472	)	—
Outstanding at December 31, 2017	$	5.16	1,694,476		1,694,476		—
Granted	$	—	—		—		—
Awarded	$	—	—		—		—
Vested	$	5.53	(453,860	)	(453,860	)	—
Forfeited	$	4.92	(44,524	)	(44,524	)	—
Outstanding at December 31, 2018	$	5.03	1,196,092		1,196,092		—

The total fair value of PSP grants that vested during each of the years ended December 31, 2018, 2017 and 2016 was $11.9 million, $6.3 million and $18.1 million, respectively.

Stock Incentive Plan

On April 28, 2010, the shareholders of the Company, Inc. approved the Stock Incentive Plan (“SIP”) that provides for the granting of stock options, stock, restricted stock units, and/or stock appreciation rights to employees and directors contingent on criteria established by the Compensation Committee of the Company’s Board of Directors. The principal purpose of the SIP is to attract, incentivize and retain key employees by offering those persons an opportunity to acquire or increase a direct proprietary interest in the Company’s operations and future success. The SIP includes a sub-plan applicable to Decus Insurance Brokers Limited (“Decus”) which, is a subsidiary of Decus Holdings (U.K.) Limited. The shares of stock reserved for issuance under the SIP are any shares that are authorized for issuance under the PSP and not already subject to grants under the PSP, and that were outstanding as of April 28, 2010, the date of suspension of the PSP, together with PSP shares and SIP shares forfeited after that date. As of April 28, 2010, 12,093,536 shares were available for issuance under the PSP, which were then transferred to the SIP. In addition, in May 2016 and May 2017 our shareholders approved amendments to the SIP to increase the shares available for issuance by an additional 2,400,000 and 2,600,000, respectively.

The Company has granted stock to our employees in the form of Restricted Stock Awards and Performance Stock Awards under the SIP. To date, a substantial majority of stock grants to employees under the SIP vest in five to ten years. The Performance Stock Awards are subject to the achievement of certain performance criteria by grantees, which may include growth in a defined book of business, Organic Revenue growth and operating profit growth of a profit center, Organic Revenue growth of the Company and consolidated EPS growth at certain levels of the Company. The performance measurement period ranges from three to five years. Beginning in 2016, certain Performance Stock Awards have a payout range between 0% to 200% depending on the achievement against the stated performance target. Prior to 2016, the majority of the grants had a binary performance measurement criteria that only allowed for 0% or 100% payout.

Non-employee members of the Board of Directors received shares annually issued pursuant to the SIP as part of their annual compensation. A total of 33,720 shares were issued in January 2016, 22,700 shares were issued in January 2017 and 26,620 shares were issued in January 2018.

The Company uses the closing stock price on the day prior to the grant date to determine the fair value of SIP grants and then applies an estimated forfeiture factor to estimate the annual expense. Additionally, the Company uses the path-dependent lattice model to estimate the fair value of grants with PSP-type vesting conditions as of the grant date. SIP shares that satisfied the first vesting condition for PSP-type grants or the established performance criteria are considered awarded shares. Awarded shares are included as issued and outstanding common stock shares and are included in the calculation of basic and diluted net income per share.

A summary of SIP activity for the years ended December 31, 2018, 2017 and 2016 is as follows:



	Weighted- average grant date fair value		Granted shares		Awarded shares		Shares not yet awarded
Outstanding at January 1, 2016	$	14.37	12,553,944		2,259,988		10,293,956
Granted	$	17.76	1,944,198		365,306		1,578,892		⁽¹⁾
Awarded	$	12.46	—		2,862,638		(2,862,638	)
Vested	$	13.66	(333,768	)	(333,768	)	—
Forfeited	$	12.67	(1,908,262	)	(351,576	)	(1,556,686	)
Outstanding at December 31, 2016	$	14.98	12,256,112		4,802,588		7,453,524
Granted	$	20.82	1,392,912		241,334		1,151,578		⁽²⁾
Awarded	$	15.72	—		326,808		(326,808	)
Vested	$	12.61	(484,914	)	(484,914	)	—
Forfeited	$	14.89	(342,120	)	(76,212	)	(265,908	)
Outstanding at December 31, 2017	$	15.58	12,821,990		4,809,604		8,012,386
Granted	$	22.87	1,577,721		454,313		1,123,408		⁽³⁾
Awarded	$	15.89	—		2,489,905		(2,489,905	)
Vested	$	14.09	(933,916	)	(933,916	)	—
Forfeited	$	16.37	(2,363,420	)	(224,587	)	(2,138,833	)
Outstanding at December 31, 2018	$	16.69	11,102,375		6,595,319		4,507,056


(1)	Of the 1,578,892 shares of performance-based restricted stock granted in 2016, the payout for 706,264 shares may be increased up to 200% of the target or decreased to zero, subject to the level of performance attained. The amount reflected in the table includes all restricted stock grants at a target payout of 100%.


(2)	Of the 1,151,578 shares of performance-based restricted stock granted in 2017, the payout for 641,652 shares may be increased up to 200% of the target or decreased to zero, subject to the level of performance attained. The amount reflected in the table includes all restricted stock grants at a target payout of 100%.


(3)	Of the 1,123,408 shares of performance-based restricted stock granted in 2018, the payout for 576,886 shares may be increased up to 200% of the target or decreased to zero, subject to the level of performance attained. The amount reflected in the table includes all restricted stock grants at a target payout of 100%.

The following table sets forth information as of December 31, 2018, 2017 and 2016, with respect to the number of time-based restricted shares granted and awarded, the number of performance-based restricted shares granted, and the number of performance-based restricted shares awarded under our Performance Stock Plan and 2010 Stock Incentive Plan:



Year	Time-based restricted stock granted and awarded	Performance-based restricted stock granted		Performance-based restricted stock awarded
2018	454,313	1,123,408	⁽¹⁾	2,489,905
2017	241,334	1,151,578	⁽²⁾	326,808
2016	365,306	1,578,892	⁽³⁾	2,870,638


(1)	Of the 1,123,408 shares of performance-based restricted stock granted in 2018, the payout for 576,886 shares may be increased up to 200% of the target or decreased to zero, subject to the level of performance attained. The amount reflected in the table includes all restricted stock grants at a target payout of 100%.


(2)	Of the 1,151,578 shares of performance-based restricted stock granted in 2017, the payout for 641,652 shares may be increased up to 200% of the target or decreased to zero, subject to the level of performance attained. The amount reflected in the table includes all restricted stock grants at a target payout of 100%.


(3)	Of the 1,578,892 shares of performance-based restricted stock granted in 2016, the payout for 706,264 shares may be increased up to 200% of the target or decreased to zero, subject to the level of performance attained. The amount reflected in the table includes all restricted stock grants at a target payout of 100%.

At December 31, 2018, 8,697,491 shares were available for future grants. This amount is calculated assuming the maximum payout for all restricted stock grants.

Employee Stock Purchase Plan

The Company has a shareholder-approved Employee Stock Purchase Plan (“ESPP”) with a total of 34,000,000 authorized shares of which 7,316,901 were available for future subscriptions as of December 31, 2018. Employees of the Company who regularly work 20 hours or more per week are eligible to participate in the ESPP. Participants, through payroll deductions, may allot up to 10% of their compensation towards the purchase of a maximum of $25,000 worth of Company stock between August 1st of each year and the following July 31st (the “Subscription Period”) at a cost of 85% of the lower of the stock price as of the beginning or end of the Subscription Period.

The Company estimates the fair value of an ESPP share option as of the beginning of the Subscription Period as the sum of: (1) 15% of the quoted market price of the Company’s stock on the day prior to the beginning of the Subscription Period, and (2) 85% of the value of a one-year stock option on the Company stock using the Black-Scholes option-pricing model. The estimated fair value of an ESPP share option as of the Subscription Period beginning in August 2018 was $5.88. The fair values of an ESPP share option as of the Subscription Periods beginning in August 2017 and 2016, were $4.32 and $3.81, respectively.

For the ESPP plan years ended July 31, 2018, 2017 and 2016, the Company issued 985,601, 1,058,024 and 1,029,330 shares of common stock, respectively. These shares were issued at an aggregate purchase price of $18.7 million, or $18.96 per share, in 2018, $16.4 million, or $15.52 per share, in 2017, and $15.0 million, or $14.62 per share, in 2016.

For the five months ended December 31, 2018, 2017 and 2016 (portions of the 2018-2019, 2017-2018 and 2016-2017 plan years), 402,349, 435,027 and 494,046 shares of common stock (from authorized but unissued shares), respectively, were subscribed to by ESPP participants for proceeds of approximately $9.9 million, $8.2 million and $7.7 million, respectively.

Summary of Non-Cash Stock-Based Compensation Expense

The non-cash stock-based compensation expense for the years ended December 31 is as follows:



(in thousands)	2018		2017		2016
Stock incentive plan	$	28,027	$	24,899	$	11,049
Employee stock purchase plan	4,744		4,025		3,698
Performance stock plan	748		1,707		1,305
Total	$	33,519	$	30,631	$	16,052

Summary of Unamortized Compensation Expense

As of December 31, 2018, the Company estimates there to be $97.1 million of unamortized compensation expense related to all non-vested stock-based compensation arrangements granted under the Company’s stock-based compensation plans, based upon current projections of grant measurement against performance criteria. That expense is expected to be recognized over a weighted average period of 3.29 years.

Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities

12 Months Ended

Dec. 31, 2018

Supplemental Cash Flow Elements [Abstract]

Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities

The following is a reconciliation of cash and cash equivalents inclusive of restricted cash as of December 31, 2018, 2017 and 2016.



	Balance as of December 31,
(in thousands)	2018		2017		2016
Table to reconcile cash and cash equivalents inclusive of restricted cash
Cash and cash equivalents	$	438,961	$	573,383	515,646
Restricted cash	338,635		250,705		265,637
Total cash and cash equivalents inclusive of restricted cash at the end of the period	$	777,596	$	824,088	781,283

Commitments and Contingencies (Notes)

12 Months Ended

Dec. 31, 2018

Other Commitments [Line Items]

Commitments and Contingencies Disclosure [Text Block]

NOTE 14· Commitments and Contingencies

Operating Leases

The Company leases facilities and certain items of office equipment under non-cancelable operating lease arrangements expiring on various dates through 2042. The facility leases generally contain renewal options and escalation clauses based upon increases in the lessors’ operating expenses and other charges. The Company anticipates that most of these leases will be renewed or replaced upon expiration. At December 31, 2018, the aggregate future minimum lease payments under all non-cancelable lease agreements were as follows:



(in thousands)
2019	$	48,292
2020	43,517
2021	34,836
2022	27,035
2023	19,981
Thereafter	36,349
Total minimum future lease payments	$	210,010

Rental expense in 2018, 2017 and 2016 for operating leases totaled $54.6 million, $51.0 million and $49.3 million, respectively.

Legal Proceedings

The Company records losses for claims in excess of the limits of, or outside the coverage of, applicable insurance at the time and to the extent they are probable and estimable. In accordance with ASC Topic 450-Contingencies, the Company accrues anticipated costs of settlement, damages, losses for liability claims and, under certain conditions, costs of defense, based upon historical experience or to the extent specific losses are probable and estimable. Otherwise, the Company expenses these costs as incurred. If the best estimate of a probable loss is a range rather than a specific amount, the Company accrues the amount at the lower end of the range.

The Company’s accruals for legal matters that were probable and estimable were not material at December 31, 2018 and 2017. We continue to assess certain litigation and claims to determine the amounts, if any, that management believes will be paid as a result of such claims and litigation and, therefore, additional losses may be accrued and paid in the future, which could adversely impact the Company’s operating results, cash flows and overall liquidity. The Company maintains third-party insurance policies to provide coverage for certain legal claims, in an effort to mitigate its overall exposure to unanticipated claims or adverse decisions. However, as (i) one or more of the Company’s insurance carriers could take the position that portions of these claims are not covered by the Company’s insurance, (ii) to the extent that payments are made to resolve claims and lawsuits, applicable insurance policy limits are eroded and (iii) the claims and lawsuits relating to

these matters are continuing to develop, it is possible that future results of operations or cash flows for any particular quarterly or annual period could be materially affected by unfavorable resolutions of these matters. Based upon the AM Best Company ratings of these third-party insurers, management does not believe there is a substantial risk of an insurer’s material non-performance related to any current insured claims.

On the basis of current information, the availability of insurance and legal advice, in management’s opinion, the Company is not currently involved in any legal proceedings which, individually or in the aggregate, would have a material adverse effect on its financial condition, operations and/or cash flows.

Quarterly Operating Results (Notes)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Text Block]

Quarterly Operating Results (Unaudited)

Quarterly operating results for 2018 and 2017 were as follows:



(in thousands, except per share data)	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
2018
Total revenues	$	501,461	$	473,187	$	530,850	$	508,748
Total expenses	$	383,020	$	372,277	$	388,350	$	408,137
Income before income taxes	$	118,441	$	100,910	$	142,500	$	100,611
Net income	$	90,828	$	73,922	$	106,053	$	73,452
Net income per share:
Basic	$	0.33	$	0.27	$	0.38	$	0.26
Diluted	$	0.32	$	0.26	$	0.38	$	0.26
2017
Total revenues	$	465,080	$	466,305	$	475,646	$	474,316
Total expenses	$	354,113	$	358,303	$	351,227	$	367,982
Income before income taxes	$	110,967	$	108,002	$	124,419	$	106,334
Net income	$	70,110	$	66,102	$	75,913	$	187,505
Net income per share:
Basic⁽¹⁾	$	0.25	$	0.24	$	0.27	$	0.68
Diluted⁽¹⁾	$	0.25	$	0.23	$	0.27	$	0.66	⁽²⁾


(1)	2017 reflects the 2-for-1 stock split that occurred on March 28, 2018.


(2)	Includes $0.43 impact associated with recording impact of the Tax Reform Act.

Quarterly financial results are affected by seasonal variations. The timing of the Company’s policy renewals and acquisitions may cause revenues, expenses and net income to vary significantly between quarters.

Segment Information

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Segment Information

Brown & Brown’s business is divided into four reportable segments: (1) the Retail Segment, which provides a broad range of insurance products and services to commercial, public and quasi-public entities, and to professional and individual customers, (2) the National Programs Segment, which acts as an MGA, provides professional liability and related package products for certain professionals, a range of insurance products for individuals, flood coverage, and targeted products and services designated for specific industries, trade groups, governmental entities and market niches, all of which are delivered through nationwide networks of independent agents, and Brown & Brown retail agents, (3) the Wholesale Brokerage Segment, which markets and sells excess and surplus commercial and personal lines insurance, primarily through independent agents and brokers, as well as Brown & Brown retail agents, and (4) the Services Segment, which provides insurance-related services, including third-party claims administration and comprehensive medical utilization management services in both the workers’ compensation and all-lines liability arenas, as well as Medicare Set-aside services, Social Security disability and Medicare benefits advocacy services and claims adjusting services.

Brown & Brown conducts all of its operations within the United States of America, except for a wholesale brokerage operation based in London, England, retail operations in Bermuda and the Cayman Islands, and a national programs operation in Canada. These operations earned $15.2 million, $15.9 million and $14.5 million of total revenues for the years ended December 31, 2018, 2017 and 2016, respectively. Long-lived assets held outside of the United States during each of these three years were not material.

The accounting policies of the reportable segments are the same as those described in Note 1. The Company evaluates the performance of its segments based upon revenues and income before income taxes. Inter-segment revenues are eliminated.

Summarized financial information concerning the Company’s reportable segments is shown in the following table. The “Other” column includes any income and expenses not allocated to reportable segments and corporate-related items, including the intercompany interest expense charge to the reporting segment.



	Year ended December 31, 2018
(in thousands)	Retail		National Programs		Wholesale Brokerage		Services		Other			Total
Total revenues	$	1,042,763	$	494,463	$	287,014	$	189,246	$	760		$	2,014,246
Investment income	$	2	$	506	$	165	$	205	$	1,868		$	2,746
Amortization	$	44,386	$	25,954	$	11,391	$	4,813	$	—		$	86,544
Depreciation	$	5,289	$	5,486	$	1,628	$	1,558	$	8,873		$	22,834
Interest expense	$	35,969	$	26,181	$	5,254	$	2,869	$	(29,693	)	$	40,580
Income before income taxes	$	217,845	$	117,375	$	70,171	$	34,508	$	22,563		$	462,462
Total assets	$	5,850,045	$	2,940,097	$	1,283,877	$	471,572	$	(3,856,923	)	$	6,688,668
Capital expenditures	$	6,858	$	12,391	$	2,518	$	1,525	$	18,228		$	41,520



	Year ended December 31, 2017
(in thousands)	Retail		National Programs		Wholesale Brokerage		Services		Other			Total
Total revenues	$	943,460	$	479,813	$	271,737	$	165,372	$	20,965		$	1,881,347
Investment income	$	8	$	384	$	—	$	299	$	935		$	1,626
Amortization	$	42,164	$	27,277	$	11,456	$	4,548	$	1		$	85,446
Depreciation	$	5,210	$	6,325	$	1,885	$	1,600	$	7,678		$	22,698
Interest expense	$	31,133	$	35,561	$	6,263	$	3,522	$	(38,163	)	$	38,316
Income before income taxes	$	196,616	$	109,961	$	68,844	$	30,498	$	43,803		$	449,722
Total assets	$	4,255,515	$	3,267,486	$	1,260,239	$	399,240	$	(3,434,930	)	$	5,747,550
Capital expenditures	$	4,494	$	5,936	$	1,836	$	1,033	$	10,893		$	24,192



	Year ended December 31, 2016
(in thousands)	Retail		National Programs		Wholesale Brokerage		Services		Other			Total
Total revenues	$	917,406	$	448,516	$	243,103	$	156,365	$	1,239		$	1,766,629
Investment income	$	37	$	628	$	4	$	283	$	504		$	1,456
Amortization	$	43,447	$	27,920	$	10,801	$	4,485	$	10		$	86,663
Depreciation	$	6,191	$	7,868	$	1,975	$	1,881	$	3,088		$	21,003
Interest expense	$	38,216	$	45,738	$	3,976	$	4,950	$	(53,399	)	$	39,481
Income before income taxes	$	188,001	$	91,762	$	62,623	$	24,338	$	56,775		$	423,499
Total assets⁽¹⁾	$	3,854,393	$	2,711,378	$	1,108,829	$	371,645	$	(2,783,511	)	$	5,262,734
Capital expenditures	$	5,951	$	6,977	$	1,301	$	656	$	2,880		$	17,765

(1)

Total assets have been restated to reflect the adoption of ASU No. 2015-17, “Income Taxes (Topic 740) - Balance Sheet Classification of Deferred Taxes” (“ASU 2015-17”).

Losses and Loss Adjustment Reserve

12 Months Ended

Dec. 31, 2018

Reinsurance Disclosures [Abstract]

Losses and Loss Adjustment Reserve

Although the reinsurers are liable to the Company for amounts reinsured, our subsidiary, WNFIC remains primarily liable to its policyholders for the full amount of the policies written whether or not the reinsurers meet their obligations to the Company when they become due. The effects of reinsurance on premiums written and earned at December 31 are as follows:



	2018				2017
(in thousands)	Written		Earned		Written		Earned
Direct premiums	$	619,223	$	602,320	$	604,623	$	592,267
Assumed premiums	—		—		—		—
Ceded premiums	619,206		602,303		604,610		592,254
Net premiums	$	17	$	17	$	13	$	13

All premiums written by WNFIC under the National Flood Insurance Program are 100% ceded to FEMA, for which WNFIC received a 30.9% expense allowance from January 1, 2018 through September 30, 2018. From October 1, 2018 through December 31, 2018 WNFIC received a 30.0% expense allowance. As of December 31, 2018 and 2017, the Company ceded $617.2 million and $602.9 million of written premiums, respectively.

Effective April 1, 2014, WNFIC is also a party to a quota share agreement whereby it cedes 100% of its gross private excess flood premiums, excluding fees, to Arch Reinsurance Company and receives a 30.5% commission. WNFIC ceded $2.0 million and $1.7 million for the years ended December 31, 2018 and 2017. As of December 31, 2018, WNFIC had $2.3 million in paid excess flood losses, $99,349 in loss adjustment expenses, case reserves of $0 and incurred but not reported of $0.1 million.

WNFIC also ceded 100%, of the Homeowners, Private Passenger Auto Liability, and Other Liability Occurrence to Stillwater Insurance Company, formerly known as Fidelity National Insurance Company. This business is in runoff. Therefore, only loss data still exists on this business. As of December 31, 2018, no ceded unpaid losses and loss adjustment expenses or incurred but not reported balance for Homeowners, Private Passenger Auto Liability and Other Liability Occurrence.

As of December 31, 2018, the Consolidated Balance Sheet contained Reinsurance recoverable of $65.4 million and Prepaid reinsurance premiums of $337.9 million. As of December 31, 2017, the Consolidated Balance Sheet contained reinsurance recoverable of $477.8 million and prepaid reinsurance premiums of $321.0 million. There was $0.2 million net activity in the reserve for losses and loss adjustment expense for the year ended December 31, 2018, and $1.1 million net activity in the reserve for losses and loss adjustment expense for the year ended December 31, 2017, as WNFIC’s direct premiums written were 100% ceded to two reinsurers. The balance of the reserve for losses and loss adjustment expense, excluding related reinsurance recoverables was $65.4 million as of December 31, 2018 and $477.8 million as of December 31, 2017.

Shareholders' Equity	12 Months Ended
Shareholders' Equity	Dec. 31, 2018
Equity [Abstract]
Shareholders' Equity	Shareholders’ Equity On July 18, 2014, the Company’s Board of Directors authorized the repurchase of up to $200.0 million of its shares of common stock, and on July 20, 2015, the Company’s Board of Directors authorized the repurchase of up to an additional $400.0 million of the Company’s outstanding common stock. Under the authorization from the Company’s Board of Directors, shares may be purchased from time to time, at the Company’s discretion and subject to the availability of stock, market conditions, the trading price of the stock, alternative uses for capital, the Company’s financial performance and other potential factors. These purchases may be carried out through open market purchases, block trades, accelerated share repurchase plans of up to $100.0 million each (unless otherwise approved by the Board of Directors), negotiated private transactions or pursuant to any trading plan that may be adopted in accordance with Rule 10b5-1 of the Securities Exchange Act of 1934. On March 28, 2018, we effected a 2-for-1 stock split (the “Stock Split”). As a result of the Stock Split, every share of common stock outstanding as of close of business on March 14, 2018 received an additional share of common stock, increasing the number of outstanding shares of common stock from approximately 138 million shares to approximately 276 million shares. The number of authorized shares of our common stock increased from 280 million shares to 560 million shares. No fractional shares were issued in connection with the Stock Split. Par value of the Company’s common stock was unchanged as a result of the Stock Split remaining at $0.10 per share. The number of shares of common stock reserved or subject to outstanding grants, the exercise or purchase prices applicable to such outstanding grants and subscriptions, and certain grant limitations under our 1990 Employee Stock Purchase Plan, Performance Stock Plan and 2010 Stock Incentive Plan were adjusted as a result of the Stock Split, as required under the terms of those plans. Treasury shares were not adjusted for the Stock Split. All other shares and per share data included within this Annual Report on Form 10-K, including our Consolidated Financial Statements and related footnotes, have been adjusted to account for the effect of the Stock Split. On December 12, 2018, the Company entered into accelerated share repurchase agreement ("ASR") with an investment bank to purchase an aggregate $100.0 million of the Company’s common stock. As part of the ASR, the Company received an initial share delivery of 2,910,150 shares of the Company’s common stock with a fair market value of $80.0 million. Upon maturity of the program, the Company will receive the remaining balance of $20.0 million at settlement. During 2014, the Company repurchased 2,384,760 shares at an average price per share of $31.46 for a total cost of $75.0 million under the original share repurchase authorization from the Board of Directors on July 18, 2014. During 2015, the Company repurchased 5,408,819 shares at an average price per share of $32.35 for a total cost of $175.0 million under the current share repurchase authorization, while exhausting the previous authorization of $200.0 million from the Board of Directors in 2014. During 2016, the Company repurchased 209,618 shares at an average price per share of $36.53 for a total cost of $7.7 million under the current share repurchase authorization. During 2017, the Company repurchased 2,883,349 shares at an average price of $48.51 for a total cost of $139.9 million under the current share repurchase authorization. At December 31, 2018, the remaining amount authorized by our Board of Directors for share repurchases was $147.5 million. Under the authorized repurchase programs, the Company has repurchased a total of approximately 13.8 million shares for an aggregate cost of approximately $477.5 million between 2014 and 2017. The aforementioned share amounts have not been adjusted for the March 28, 2018 Stock Split, as treasury shares did not participate in this stock split transaction.

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Line Items]

Average Annual Operating Profit Earned Period Maximum

3 years

Fair Value of Financial Instruments, Policy [Policy Text Block]

Fair Value of Financial Instruments The carrying amounts of the Company’s financial assets and liabilities, including cash and cash equivalents; restricted cash and short-term investments; investments; premiums, commissions and fees receivable; reinsurance recoverable; prepaid reinsurance premiums; premiums payable to insurance companies; losses and loss adjustment reserve; unearned premium; premium deposits and credits due customers and accounts payable, at December 31, 2018 and 2017, approximate fair value because of the short-term maturity of these instruments. The carrying amount of the Company’s long-term debt approximates fair value at December 31, 2018 and 2017 as our fixed-rate borrowings of $499.1 million approximate their values using market quotes of notes with the similar terms as ours, which we deem a close approximation of current market rates. The estimated fair value of the $1,015.0 million currently outstanding approximates the carrying value due to the variable interest rate based upon adjusted LIBOR. See Note 3 to our Consolidated Financial Statements for the fair values related to the establishment of intangible assets and the establishment and adjustment of earn-out payables. See Note 6 for information on the fair value of investments and Note 9 for information on the fair value of long-term debt.

Nature of Operations

NOTE 1· Summary of Significant Accounting Policies

Nature of Operations

Recently Issued Accounting Pronouncements

Recently Adopted Accounting Standards

The following areas are impacted by the adoption of Topic 606:



(in thousands)	Balance at December 31, 2017		Adjustments due to the New Revenue Standard		Balance at January 1, 2018
Balance Sheet
Assets:
Premiums, commissions and fees receivable	$	546,402	$	153,058	$	699,460
Other current assets	47,864		52,680		100,544

Liabilities:
Premiums payable to insurance companies	685,163		12,107		697,270
Accounts payable	64,177		8,747		72,924
Accrued expenses and other liabilities	228,748		22,794		251,542
Deferred income taxes, net	256,185		44,575		300,760

Shareholders' Equity:
Retained earnings	$	2,456,599	$	117,515	$	2,574,114

The following table illustrates the impact of adopting the New Revenue Standard has had on our reported results in the consolidated statement of income.



	December 31, 2018
(in thousands)	As reported		Impact of adopting the New Revenue Standard			Balances without the New Revenue Standard
Statement of Income
Revenues:
Commissions and fees	$	2,009,857	$	18,399		$	1,991,458

Expenses:
Employee compensation and benefits	1,068,914		(8,835		)	1,077,749
Other operating expenses	332,118		10,621			321,497
Income taxes	118,207		4,246			113,961

Net income	$	344,255	$	12,367		$	331,888

Principles of Consolidation

Revenue Recognition

Management determines the policy cancellation reserve based upon historical cancellation experience adjusted for any known circumstances.

Use of Estimates

Cash and Cash Equivalents

Restricted Cash and Investments, and Premiums, Commissions and Fees Receivable

Investments

Fixed Assets

range from 3 to 15 years. Leasehold improvements are amortized on the straight-line method over the shorter of the useful life of the improvement or the term of the related lease.

Goodwill and Amortizable Intangible Assets

Income Taxes

Recently Issued Accounting Pronouncements

Recently Adopted Accounting Standards

The following areas are impacted by the adoption of Topic 606:



(in thousands)	Balance at December 31, 2017		Adjustments due to the New Revenue Standard		Balance at January 1, 2018
Balance Sheet
Assets:
Premiums, commissions and fees receivable	$	546,402	$	153,058	$	699,460
Other current assets	47,864		52,680		100,544

Liabilities:
Premiums payable to insurance companies	685,163		12,107		697,270
Accounts payable	64,177		8,747		72,924
Accrued expenses and other liabilities	228,748		22,794		251,542
Deferred income taxes, net	256,185		44,575		300,760

Shareholders' Equity:
Retained earnings	$	2,456,599	$	117,515	$	2,574,114

The following table illustrates the impact of adopting the New Revenue Standard has had on our reported results in the consolidated statement of income.



	December 31, 2018
(in thousands)	As reported		Impact of adopting the New Revenue Standard			Balances without the New Revenue Standard
Statement of Income
Revenues:
Commissions and fees	$	2,009,857	$	18,399		$	1,991,458

Expenses:
Employee compensation and benefits	1,068,914		(8,835		)	1,077,749
Other operating expenses	332,118		10,621			321,497
Income taxes	118,207		4,246			113,961

Net income	$	344,255	$	12,367		$	331,888

Consolidation, Policy [Policy Text Block]

Principles of Consolidation

Revenue Recognition, Policy [Policy Text Block]

Revenue Recognition

Management determines the policy cancellation reserve based upon historical cancellation experience adjusted for any known circumstances.

Use of Estimates, Policy [Policy Text Block]

Use of Estimates The preparation of the Consolidated Financial Statements in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, as well as disclosures of contingent assets and liabilities, at the date of the Consolidated Financial Statements, and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from those estimates

Cash and Cash Equivalents, Policy [Policy Text Block]

Cash and Cash Equivalents Cash and cash equivalents principally consist of demand deposits with financial institutions and highly liquid investments with quoted market prices having maturities of three months or less when purchased.

Restricted Cash and Investments Premiums Commissions and Fees Receivable Policy [Text Block]

Restricted Cash and Investments, and Premiums, Commissions and Fees Receivable

Investment, Policy [Policy Text Block]

Investments Certificates of deposit, and other securities, having maturities of more than three months when purchased are reported at cost and are adjusted for other-than-temporary market value declines. The Company’s investment holdings include U.S. Government securities, municipal bonds, domestic corporate and foreign corporate bonds as well as short-duration fixed income funds. Investments within the portfolio or funds are held as available-for-sale and are carried at their fair value. Any gain/loss applicable from the fair value change is recorded, net of tax, as other comprehensive income within the equity section of the Consolidated Balance Sheet. Realized gains and losses are reported on the Consolidated Statement of Income, with the cost of securities sold determined on a specific identification basis

Property, Plant and Equipment, Policy [Policy Text Block]

Fixed Assets

range from 3 to 15 years. Leasehold improvements are amortized on the straight-line method over the shorter of the useful life of the improvement or the term of the related lease.

Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block]

Goodwill and Amortizable Intangible Assets

Income Tax, Policy [Policy Text Block]

Income Taxes

Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]

Stock-Based Compensation

The Company grants non-vested stock awards to its employees and officers and fully vested stock awards to directors. The Company uses the modified-prospective method to account for share-based payments. Under the modified-prospective method, compensation cost is recognized for all share-based payments granted on or after January 1, 2006 and for all awards granted to employees prior to January 1, 2006 that remained unvested on that date. The Company uses the alternative-transition method to account for the income tax effects of payments made related to stock-based compensation.

The Company uses the Black-Scholes valuation model for valuing all stock options and shares purchased under the Employee Stock Purchase Plan (the “ESPP”). Compensation for non-vested stock awards is measured at fair value on the grant date based upon the number of shares expected to vest. Compensation cost for all awards is recognized in earnings, net of estimated forfeitures, on a straight-line basis over the requisite service period

Reinsurance Accounting Policy [Policy Text Block]

Reinsurance

The Company protects itself from claims-related losses by reinsuring all claims risk exposure. The only line of insurance the Company underwrites is flood insurance associated with the Wright National Flood Insurance Company (“WNFIC”), which is part of our National Programs Segment. However, all exposure is reinsured with the Federal Emergency Management Agency (“FEMA”) for basic admitted policies conforming to the National Flood Insurance Program. For excess flood insurance policies, all exposure is reinsured with a reinsurance carrier with an AM Best Company rating of “A” or better. Reinsurance does not legally discharge the ceding insurer from the primary liability for the full amount due under the reinsured policies. Reinsurance premiums, commissions, expense reimbursement and reserves related to ceded business are accounted for on a basis consistent with the accounting for the original policies issued and the terms of reinsurance contracts. Premiums earned and losses and loss adjustment expenses incurred are reported net of reinsurance amounts. Other underwriting expenses are shown net of earned ceding commission income. The liabilities for unpaid losses and loss adjustment expenses and unearned premiums are reported gross of ceded reinsurance recoverable.

Balances due from reinsurers on unpaid losses and loss adjustment expenses, including an estimate of such recoverables related to reserves for incurred but not reported (“IBNR”) losses, are reported as assets and are included in reinsurance recoverable even though amounts

due on unpaid loss and loss adjustment expense are not recoverable from the reinsurer until such losses are paid. The Company does not believe it is exposed to any material credit risk through its reinsurance as the reinsurer is FEMA for basic admitted flood policies and national reinsurance carriers for private flood policies, which has an AM Best Company rating of “A” or better. Historically, no amounts due from reinsurance carriers have been written off as uncollectible.

Unpaid Policy Claims and Claims Adjustment Expense, Policy [Policy Text Block]

Unpaid Losses and Loss Adjustment Reserve

Unpaid losses and loss adjustment reserve include amounts determined on individual claims and other estimates based upon the past experience of WNFIC and the policyholders for IBNR claims, less anticipated salvage and subrogation recoverable. The methods of making such estimates and for establishing the resulting reserves are continually reviewed and updated, and any adjustments resulting therefrom are reflected in operations currently.

WNFIC engages the services of outside actuarial consulting firms (the “Actuaries”) to assist on an annual basis to render an opinion on the sufficiency of the Company’s estimates for unpaid losses and related loss adjustment reserve. The Actuaries utilize both industry experience and the Company’s own experience to develop estimates of those amounts as of year-end. These estimated liabilities are subject to the impact of future changes in claim severity, frequency and other factors. In spite of the variability inherent in such estimates, management believes that the liabilities for unpaid losses and related loss adjustment reserve are adequate.

Insurance Premiums Revenue Recognition, Policy [Policy Text Block]

PremiumsPremiums are recognized as income over the coverage period of the related policies. Unearned premiums represent the portion of premiums written that relate to the unexpired terms of the policies in force and are determined on a daily pro rata basis. The income is recorded to the commissions and fees line of the income statement.

Minimum

Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Useful Life

3 years

Maximum

Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Useful Life

15 years

Nature of Operations (Policies)

12 Months Ended

Dec. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Nature of Operations

Nature of OperationsBrown & Brown, Inc., a Florida corporation, and its subsidiaries (collectively, “Brown & Brown” or the “Company”) is a diversified insurance agency, wholesale brokerage, insurance programs and services organization that markets and sells to its customers, insurance products and services, primarily in the property, casualty and employee benefits areas. Brown & Brown’s business is divided into four reportable segments: the Retail Segment provides a broad range of insurance products and services to commercial, public and quasi-public entities, professional and individual customers; the National Programs Segment, acting as a managing general agent (“MGA”), provides professional liability and related package products for certain professionals, a range of insurance products for individuals, flood coverage, and targeted products and services designated for specific industries, trade groups, governmental entities and market niches, all of which are delivered through a nationwide network of independent agents, including Brown & Brown retail agents; the Wholesale Brokerage Segment markets and sells excess and surplus commercial insurance, primarily through a nationwide network of independent agents and brokers, as well as Brown & Brown Retail offices; and the Services Segment provides insurance-related services, including third-party claims administration and comprehensive medical utilization management services in both the workers’ compensation and all-lines liability arenas, as well as Medicare Set-aside services, Social Security disability and Medicare benefits advocacy services, and claims adjusting services.

Recently Issued Accounting Pronouncements

Recently Adopted Accounting Standards

The following areas are impacted by the adoption of Topic 606:



(in thousands)	Balance at December 31, 2017		Adjustments due to the New Revenue Standard		Balance at January 1, 2018
Balance Sheet
Assets:
Premiums, commissions and fees receivable	$	546,402	$	153,058	$	699,460
Other current assets	47,864		52,680		100,544

Liabilities:
Premiums payable to insurance companies	685,163		12,107		697,270
Accounts payable	64,177		8,747		72,924
Accrued expenses and other liabilities	228,748		22,794		251,542
Deferred income taxes, net	256,185		44,575		300,760

Shareholders' Equity:
Retained earnings	$	2,456,599	$	117,515	$	2,574,114

The following table illustrates the impact of adopting the New Revenue Standard has had on our reported results in the consolidated statement of income.



	December 31, 2018
(in thousands)	As reported		Impact of adopting the New Revenue Standard			Balances without the New Revenue Standard
Statement of Income
Revenues:
Commissions and fees	$	2,009,857	$	18,399		$	1,991,458

Expenses:
Employee compensation and benefits	1,068,914		(8,835		)	1,077,749
Other operating expenses	332,118		10,621			321,497
Income taxes	118,207		4,246			113,961

Net income	$	344,255	$	12,367		$	331,888

Commitments and Contingencies Legal Proceedings (Policies)	12 Months Ended
	Dec. 31, 2018
Loss Contingencies [Line Items]
Legal Matters and Contingencies [Text Block]	Legal Proceedings The Company records losses for claims in excess of the limits of, or outside the coverage of, applicable insurance at the time and to the extent they are probable and estimable. In accordance with ASC Topic 450-Contingencies, the Company accrues anticipated costs of settlement, damages, losses for liability claims and, under certain conditions, costs of defense, based upon historical experience or to the extent specific losses are probable and estimable. Otherwise, the Company expenses these costs as incurred. If the best estimate of a probable loss is a range rather than a specific amount, the Company accrues the amount at the lower end of the range. The Company’s accruals for legal matters that were probable and estimable were not material at December 31, 2018 and 2017. We continue to assess certain litigation and claims to determine the amounts, if any, that management believes will be paid as a result of such claims and litigation and, therefore, additional losses may be accrued and paid in the future, which could adversely impact the Company’s operating results, cash flows and overall liquidity. The Company maintains third-party insurance policies to provide coverage for certain legal claims, in an effort to mitigate its overall exposure to unanticipated claims or adverse decisions. However, as (i) one or more of the Company’s insurance carriers could take the position that portions of these claims are not covered by the Company’s insurance, (ii) to the extent that payments are made to resolve claims and lawsuits, applicable insurance policy limits are eroded and (iii) the claims and lawsuits relating to these matters are continuing to develop, it is possible that future results of operations or cash flows for any particular quarterly or annual period could be materially affected by unfavorable resolutions of these matters. Based upon the AM Best Company ratings of these third-party insurers, management does not believe there is a substantial risk of an insurer’s material non-performance related to any current insured claims. On the basis of current information, the availability of insurance and legal advice, in management’s opinion, the Company is not currently involved in any legal proceedings which, individually or in the aggregate, would have a material adverse effect on its financial condition, operations and/or cash flows.

Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Reconciliation between Basic and Diluted Weighted Average Shares Outstanding

The following is a reconciliation between basic and diluted weighted average shares outstanding for the years ended December 31:



(in thousands, except per share data)	2018			2017⁽¹⁾			2016⁽¹⁾
Net income	$	344,255		$	399,630		$	257,491
Net income attributable to unvested awarded performance stock	(8,297		)	(9,746		)	(6,705		)
Net income attributable to common shares	$	335,958		$	389,884		$	250,786
Weighted average number of common shares outstanding – basic	277,663			279,394			279,558
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic	(6,692		)	(6,814		)	(7,280		)
Weighted average number of common shares outstanding for basic earnings per common share	270,971			272,580			272,278
Dilutive effect of stock options	4,550			5,006			3,330
Weighted average number of shares outstanding – diluted	275,521			277,586			275,608
Net income per share:
Basic	$	1.24		$	1.43		$	0.92
Diluted	$	1.22		$	1.40		$	0.91

Business Combinations (Tables)

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Business Combinations [Abstract]

Purchase price allocation for current year acquisitions and adjustments made for prior year acquisitions



(in thousands)
Name	Business segment	Effective date of acquisition	Cash paid		Common Stock Issued		Other payable		Recorded earn-out payable		Net assets acquired		Maximum potential earn- out payable
Opus Advisory Group, LLC (Opus)	Retail	February 1, 2018	$	20,400	$	—	$	200	$	2,384	$	22,984	$	3,600
Kerxton Insurance Agency, Inc. (Kerxton)	Retail	March 1, 2018	13,176		—		1,490		2,080		16,746		2,920
Automotive Development Group, LLC (ADG)	Retail	May 1, 2018	29,471		—		559		17,545		47,575		20,000
Servco Pacific, Inc. (Servco)	Retail	June 1, 2018	76,245		—		—		934		77,179		7,000
Tower Hill Prime Insurance Company (Tower Hill)	National Programs	July 1, 2018	20,300		—		—		1,188		21,488		7,700
Health Special Risk, Inc. (HSR)	National Programs	July 1, 2018	20,132		—		—		1,991		22,123		9,000
Professional Disability Associates, LLC (PDA)	Services	July 1, 2018	15,025		—		—		9,818		24,843		17,975
Finance & Insurance Resources, Inc. (F&I)	Retail	September 1, 2018	44,940		—		410		9,121		54,471		19,500
Rodman Insurance Agency, Inc. (Rodman)	Retail	November 1, 2018	31,121		—		261		3,720		35,102		9,850
The Hays Group, Inc. et al (Hays)	Retail	November 16, 2018	605,000		100,000		—		19,600		724,600		25,000
Dealer Associates, Inc. (Dealer)	Retail	December 1, 2018	28,825		—		1,175		3,100		33,100		12,125
Other	Various	Various	30,293		—		1,367		5,896		37,556		12,998
Total			$	934,928	$	100,000	$	5,462	$	77,377	$	1,117,767	$	147,668



(in thousands)
Name	Business Segment	Effective Date of Acquisition	Cash Paid		Other Payable		Recorded Earn-Out Payable		Net Assets Acquired		Maximum Potential Earn- Out Payable
Other	Various	Various	$	41,471	$	11,708	$	6,921	$	60,100	$	27,451
Total			$	41,471	$	11,708	$	6,921	$	60,100	$	27,451



(in thousands)
Name	Business Segment	Effective Date of Acquisition	Cash Paid		Note Payable		Other Payable		Recorded Earn-Out Payable		Net Assets Acquired		Maximum Potential Earn- Out Payable
Social Security Advocates for the Disabled LLC (SSAD)	Services	February 1, 2016	$	32,526	$	492	$	—	$	971	$	33,989	$	3,500
Morstan General Agency, Inc. (Morstan)	Wholesale Brokerage	June 1, 2016	66,050		—		10,200		3,091		79,341		5,000
Other	Various	Various	26,140		—		464		400		27,004		7,785
Total			$	124,716	$	492	$	10,664	$	4,462	$	140,334	$	16,285

Estimated fair values of aggregate assets and liabilities acquired



(in thousands)	Opus		Kerxton			ADG		Servco			Tower Hill		HSR			PDA			F&I		Rodman			Hays
Cash	$	—	$	—		$	—	$	8,188		$	—	$	3,114		$	(248	)	$	—	$	—		$	—
Other current assets	1,215		663			1,500		7,769			—		818			1,762			999		1,062			36,254
Fixed assets	11		10			67		179			$	—	$	124		$	310		$	34	$	45		$	4,936
Goodwill	16,414		12,423			35,769		54,429			—		18,737			16,547			36,423		26,572			456,217
Purchased customer accounts	5,008		4,712			9,751		16,442			21,468		5,516			7,700			16,611		10,129			218,600
Non-compete agreements	21		22			21		1			20		65			82			21		51			2,600
Other assets	315		419			467		1,478			—		21			6			383		542			13,977
Total assets acquired	22,984		18,249			47,575		88,486			21,488		28,395			26,159			54,471		38,401			732,584
Other current liabilities	—		(1,503		)	—		(11,307		)	—		(5,930		)	(1,093		)	—		(3,299		)	(7,984		)
Other liabilities	—		—			—		—			—		(342		)	(223		)	—		—			—
Total liabilities assumed	—		(1,503		)	—		(11,307		)	—		(6,272		)	(1,316		)	—		(3,299		)	(7,984		)
Net assets acquired	$	22,984	$	16,746		$	47,575	$	77,179		$	21,488	$	22,123		$	24,843		$	54,471	$	35,102		$	724,600



(in thousands)	Dealer			Other			Total
Cash	$	—		$	—		$	11,054
Other current assets	552			323			52,917
Fixed assets	13			100			5,829
Goodwill	21,467			22,712			717,710
Purchased customer accounts	10,986			15,085			342,008
Non-compete agreements	21			297			3,222
Other assets	226			754			18,588
Total assets acquired	33,265			39,271			1,151,328
Other current liabilities	(165		)	(1,715		)	(32,996		)
Other liabilities	—			—			(565		)
Total liabilities assumed	(165		)	(1,715		)	(33,561		)
Net assets acquired	$	33,100		$	37,556		$	1,117,767

The following table summarizes the estimated fair values of the aggregate assets and liabilities acquired as of the date of each acquisition.



(in thousands)	Total
Other current assets	$	601
Fixed assets	69
Goodwill	42,172
Purchased customer accounts	18,738
Non-compete agreements	721
Total assets acquired	62,301
Other current liabilities	(1,512		)
Deferred income tax, net	(689		)
Total liabilities assumed	(2,201		)
Net assets acquired	$	60,100

The following table summarizes the estimated fair values of the aggregate assets and liabilities acquired as of the date of each acquisition.



(in thousands)	SSAD			Morstan			Other			Total
Cash	$	2,094		$	—		$	—		$	2,094
Other current assets	1,042			2,482			1,555			5,079
Fixed assets	307			300			77			684
Goodwill	22,352			51,454			19,570			93,376
Purchased customer accounts	13,069			26,481			11,075			50,625
Non-compete agreements	72			39			117			228
Other assets	—			—			20			20
Total assets acquired	38,936			80,756			32,414			152,106
Other current liabilities	(1,717		)	(1,415		)	(5,410		)	(8,542		)
Deferred income tax, net	(3,230		)	—			—			(3,230		)
Total liabilities assumed	(4,947		)	(1,415		)	(5,410		)	(11,772		)
Net assets acquired	$	33,989		$	79,341		$	27,004		$	140,334

Unaudited pro forma results

These unaudited pro forma results are not necessarily indicative of the actual results of operations that would have occurred had the acquisitions actually been made at the beginning of the respective periods.



(UNAUDITED)	Year Ended December 31,
(in thousands, except per share data)	2018		2017
Total revenues	$	2,259,812	$	2,193,169
Income before income taxes	$	504,664	$	503,927
Net income	$	375,670	$	447,796
Net income per share:
Basic	$	1.35	$	1.60
Diluted	$	1.33	$	1.57
Weighted average number of shares outstanding:
Basic	270,971		272,580
Diluted	275,521		277,586



(UNAUDITED)	Year Ended December 31,
(in thousands, except per share data)	2017		2016
Total revenues	$	1,891,701	$	1,784,776
Income before income taxes	$	453,397	$	429,490
Net income	$	401,908	$	261,133
Net income per share:
Basic	$	1.44	$	0.93
Diluted	$	1.41	$	0.92
Weighted average number of shares outstanding:
Basic	272,580		272,278
Diluted	277,586		275,608



(UNAUDITED)	Year Ended December 31,
(in thousands, except per share data)	2016		2015
Total revenues	$	1,789,790	$	1,716,592
Income before income taxes	$	428,194	$	414,911
Net income	$	260,346	$	250,783
Net income per share:
Basic	$	0.93	$	0.89
Diluted	$	0.92	$	0.87
Weighted average number of shares outstanding:
Basic	272,278		275,620
Diluted	275,608		280,224

Schedule Of Business Acquisition Estimated Earn Out Payables Table [Text Block]

The resulting additions, payments and net changes, as well as the interest expense accretion on the estimated acquisition earn-out payables, for the years ended December 31, 2018, 2017 and 2016 were as follows:



	Year Ended December 31,
(in thousands)	2018			2017			2016
Balance as of the beginning of the period	$	36,175		$	63,821		$	78,387
Additions to estimated acquisition earn-out payables	77,377			6,920			4,462
Payments for estimated acquisition earn-out payables	(26,597		)	(43,766		)	(28,213		)
Subtotal	86,955			26,975			54,636
Net change in earnings from estimated acquisition earn-out payables:
Change in fair value on estimated acquisition earn-out payables	603			6,874			6,338
Interest expense accretion	2,366			2,326			2,847
Net change in earnings from estimated acquisition earn-out payables	2,969			9,200			9,185
Balance as of December 31,	$	89,924		$	36,175		$	63,821

Goodwill (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Carrying Value of Goodwill by Operating Segment

The changes in the carrying value of goodwill by reportable segment for the years ended December 31, are as follows:



(in thousands)	Retail			National Programs			Wholesale Brokerage		Services		Total
Balance as of January 1, 2017	$	1,354,667		$	901,294		$	284,869	$	134,572	$	2,675,402
Goodwill of acquired businesses	33,076			7,178			1,229		689		42,172
Goodwill disposed of relating to sales of businesses	(1,495		)	—			—		—		(1,495		)
Balance as of December 31, 2017	$	1,386,248		$	908,472		$	286,098	$	135,261	$	2,716,079
Goodwill of acquired businesses	676,902			18,737			5,524		16,547		717,710
Goodwill disposed of relating to sales of businesses	—			(1,003		)	—		—		(1,003		)
Balance as of December 31, 2018	$	2,063,150		$	926,206		$	291,622	$	151,808	$	3,432,786

Amortizable Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Amortizable Intangible Assets

Amortizable intangible assets at December 31, 2018 and 2017 consisted of the following:



	December 31, 2018								December 31, 2017
(in thousands)	Gross carrying value		Accumulated amortization			Net carrying value		Weighted average life in years⁽¹⁾	Gross carrying value		Accumulated amortization			Net carrying value		Weighted average life in years⁽¹⁾
Purchased customer accounts	$	1,804,404	$	(909,415	)	$	894,989	14.9	$	1,464,274	$	(824,584	)	$	639,690	15.0
Non-compete agreements	33,469		(29,651		)	3,818		4.5	30,287		(28,972		)	1,315		4.6
Total	$	1,837,873	$	(939,066	)	$	898,807		$	1,494,561	$	(853,556	)	$	641,005

(1)

Weighted average life calculated as of the date of acquisition.

Investments (Tables)

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Investments, Debt and Equity Securities [Abstract]

Schedule of Investments in Fixed Maturity Securities

At December 31, 2018, the Company’s amortized cost and fair values of fixed maturity securities are summarized as follows:



(in thousands)	Cost		Gross unrealized gains		Gross unrealized losses			Fair value
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities	$	21,729	$	7	$	(222	)	$	21,514
Corporate debt	623		—		—			623
Total	$	22,352	$	7	$	(222	)	$	22,137

At December 31, 2017, the Company’s amortized cost and fair values of fixed maturity securities are summarized as follows:



(in thousands)	Cost		Gross unrealized gains		Gross unrealized losses			Fair value
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities	$	29,970	$	—	$	(206	)	$	29,764
Corporate debt	1,072		12		—			1,084
Total	$	31,042	$	12	$	(206	)	$	30,848

Summary of Unrealized Loss Position



(in thousands)	Less than 12 Months					12 Months or More					Total
	Fair value		Unrealized losses			Fair value		Unrealized losses			Fair value		Unrealized losses
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities	$	5,866	$	(6	)	$	12,634	$	(216	)	$	18,500	$	(222	)
Corporate debt	457		—			100		—			557		—
Total	$	6,323	$	(6	)	$	12,734	$	(216	)	$	19,057	$	(222	)



(in thousands)	Less than 12 Months					12 Months or More					Total
	Fair value		Unrealized losses			Fair value		Unrealized losses			Fair value		Unrealized losses
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities	$	17,919	$	(157	)	$	11,845	$	(49	)	$	29,764	$	(206	)
Corporate debt	400		—			—		—			400		—
Total	$	18,319	$	(157	)	$	11,845	$	(49	)	$	30,164	$	(206	)

Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity

The amortized cost and estimated fair value of the fixed maturity securities at December 31, 2018 by contractual maturity are set forth below:



(in thousands)	Amortized cost		Fair value
Years to maturity:
Due in one year or less	$	4,768	$	4,743
Due after one year through five years	17,584		17,394
Due after five years through ten years	—		—
Total	$	22,352	$	22,137

The amortized cost and estimated fair value of the fixed maturity securities at December 31, 2017 by contractual maturity are set forth below:



(in thousands)	Amortized cost		Fair value
Years to maturity:
Due in one year or less	$	16,934	$	16,899
Due after one year through five years	13,876		13,708
Due after five years through ten years	232		241
Total	$	31,042	$	30,848

Fixed Assets (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]

Fixed assets at December 31 consisted of the following:



(in thousands)	2018			2017
Furniture, fixtures and equipment	$	213,928		$	190,784
Leasehold improvements	39,194			35,481
Construction in progress	7,568			—
Land, buildings and improvements	8,185			7,643
Total cost	268,875			233,908
Less accumulated depreciation and amortization	(168,480		)	(156,822		)
Total	$	100,395		$	77,086

Depreciation and amortization expense for fixed assets amounted to $22.8 million in 2018, $22.7 million in 2017 and $21.0 million in 2016.

Accrued Expenses (Tables) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2018

Jan. 01, 2018

Dec. 31, 2017

Payables and Accruals [Abstract]

Other Current Liabilities [Table Text Block]

$ 13,357

$ 10,951

Accrued expenses and other liabilities

279,310

$ 251,542

228,748

Interest Payable, Current

7,669

6,749

Reserve for policy cancellations

15,197

11,048

Accrued Rent and Vendor Expenses

34,110

30,616

Accrued Employee Benefits, Current

51,731

40,540

Accrued Bonuses

$ 120,228

106,923

Schedule of Accrued Liabilities [Table Text Block]

Accrued expenses and other liabilities at December 31 consisted of the following:



(in thousands)	2018		2017
Accrued incentive compensation	$	120,228	$	106,923
Accrued compensation and benefits	51,731		40,540
Accrued rent and vendor expenses	34,110		30,616
Deferred revenue	37,018		21,921
Reserve for policy cancellations	15,197		11,048
Accrued interest	7,669		6,749
Other	13,357		10,951
Total	$	279,310	$	228,748

Deferred Revenue

$ 37,018

$ 21,921

Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Long-Term Debt Instrument

Long-term debt at December 31, 2018 and 2017 consisted of the following:



(in thousands)	December 31, 2018			December 31, 2017
Current portion of long-term debt:
Current portion of 5-year term loan facility expires 2022	$	35,000		$	20,000
4.500% Senior Notes, Series E, quarterly interest payments, balloon due 2018	—			100,000
Current portion of 5-year term loan credit agreement expires 2023	15,000			—
Total current portion of long-term debt	50,000			120,000
Long-term debt:
Note agreements:
4.200% Senior Notes, semi-annual interest payments, balloon due 2024	499,101			498,943
Total notes	499,101			498,943
Credit agreements:
5-year term loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires June 28, 2022	330,000			365,000
5-year revolving loan facility, periodic interest payments, currently LIBOR plus up to 1.500%, plus commitment fees up to 0.250%, expires June 28, 2022	350,000			—
5-year term loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires December 21, 2023	$	285,000		$	—
Total credit agreements	965,000			365,000
Debt issuance costs (contra)	(7,111		)	(7,802		)
Total long-term debt less unamortized discount and debt issuance costs	1,456,990			856,141
Current portion of long-term debt	50,000			120,000
Total debt	$	1,506,990		$	976,141

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644

+ Details

Income Taxes (Tables) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Income Tax Contingency [Line Items]

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

ignificant components of the Company’s net deferred tax liabilities as of December 31 are as follows:



(in thousands)	2018			2017
Non-current deferred tax liabilities:
Intangible assets	$	334,200		$	306,351
Fixed assets	4,929			2,723
Impact of adoption of ASC 606 revenue recognition	29,729			—
Net unrealized holding (loss)/gain on available-for-sale securities	(78		)	(6		)
Total non-current deferred tax liabilities	368,780			309,068
Non-current deferred tax assets:
Deferred compensation	41,293			36,701
Accruals and reserves	10,455			7,534
Deferred profit-sharing contingent commissions	—			7,107
Net operating loss carryforwards	2,196			2,434
Valuation allowance for deferred tax assets	(896		)	(893		)
Total non-current deferred tax assets	53,048			52,883
Net non-current deferred tax liability	$	315,732		$	256,185

Income Tax Disclosure [Text Block]

Income Taxes

Significant components of the provision for income taxes for the years ended December 31 are as follows:



(in thousands)	2018		2017			2016
Current:
Federal	$	77,694	$	129,954		$	126,145
State	25,096		21,392			21,110
Foreign	409		929			590
Total current provision	103,199		152,275			147,845
Deferred:
Federal	8,483		18,999			15,551
State	6,519		2,984			2,612
Foreign	6		—			—
Tax Reform Act deferred tax revaluation	—		(124,166		)	—
Total deferred provision	15,008		(102,183		)	18,163
Total tax provision	$	118,207	$	50,092		$	166,008

A reconciliation of the differences between the effective tax rate and the federal statutory tax rate for the years ended December 31 is as follows:



	2018	2017	2016
Federal statutory tax rate	21.0%	35.0%	35.0%
State income taxes, net of federal income tax benefit	5.7	3.8	3.9
Non-deductible employee stock purchase plan expense	0.2	0.3	0.3
Non-deductible meals and entertainment	0.3	0.3	0.3
Non-deductible officers’ compensation	0.3	—	—
Tax Reform Act deferred tax revaluation and transition tax impact	(0.3)	(26.9)	—
Other, net	(1.6)	(1.4)	(0.3)
Effective tax rate	25.6%	11.1%	39.2%

Significant components of the Company’s net deferred tax liabilities as of December 31 are as follows:



(in thousands)	2018			2017
Non-current deferred tax liabilities:
Intangible assets	$	334,200		$	306,351
Fixed assets	4,929			2,723
Impact of adoption of ASC 606 revenue recognition	29,729			—
Net unrealized holding (loss)/gain on available-for-sale securities	(78		)	(6		)
Total non-current deferred tax liabilities	368,780			309,068
Non-current deferred tax assets:
Deferred compensation	41,293			36,701
Accruals and reserves	10,455			7,534
Deferred profit-sharing contingent commissions	—			7,107
Net operating loss carryforwards	2,196			2,434
Valuation allowance for deferred tax assets	(896		)	(893		)
Total non-current deferred tax assets	53,048			52,883
Net non-current deferred tax liability	$	315,732		$	256,185

Income taxes paid in 2018, 2017 and 2016 were $110.6 million, $152.0 million and $143.1 million, respectively.

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:



(in thousands)	2018			2017			2016
Unrecognized tax benefits balance at January 1	$	1,694		$	750		$	584
Gross increases for tax positions of prior years	594			1,070			412
Gross decreases for tax positions of prior years	(5		)	—			(41		)
Settlements	(644		)	(126		)	(205		)
Unrecognized tax benefits balance at December 31	$	1,639		$	1,694		$	750

In general, it is our practice and intention to reinvest the earnings of our non-U.S. subsidiaries in those operations.

Summary of Income Tax Contingencies [Table Text Block]

$ 15,008

$ (102,183)

$ 18,163

Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block]

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:



(in thousands)	2018			2017			2016
Unrecognized tax benefits balance at January 1	$	1,694		$	750		$	584
Gross increases for tax positions of prior years	594			1,070			412
Gross decreases for tax positions of prior years	(5		)	—			(41		)
Settlements	(644		)	(126		)	(205		)
Unrecognized tax benefits balance at December 31	$	1,639		$	1,694		$	750

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

Significant components of the provision for income taxes for the years ended December 31 are as follows:



(in thousands)	2018		2017			2016
Current:
Federal	$	77,694	$	129,954		$	126,145
State	25,096		21,392			21,110
Foreign	409		929			590
Total current provision	103,199		152,275			147,845
Deferred:
Federal	8,483		18,999			15,551
State	6,519		2,984			2,612
Foreign	6		—			—
Tax Reform Act deferred tax revaluation	—		(124,166		)	—
Total deferred provision	15,008		(102,183		)	18,163
Total tax provision	$	118,207	$	50,092		$	166,008

Income Taxes Tax Rate (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

A reconciliation of the differences between the effective tax rate and the federal statutory tax rate for the years ended December 31 is as follows:



	2018	2017	2016
Federal statutory tax rate	21.0%	35.0%	35.0%
State income taxes, net of federal income tax benefit	5.7	3.8	3.9
Non-deductible employee stock purchase plan expense	0.2	0.3	0.3
Non-deductible meals and entertainment	0.3	0.3	0.3
Non-deductible officers’ compensation	0.3	—	—
Tax Reform Act deferred tax revaluation and transition tax impact	(0.3)	(26.9)	—
Other, net	(1.6)	(1.4)	(0.3)
Effective tax rate	25.6%	11.1%	39.2%

Stock Based Compensation (Tables) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based Compensation

$ 33,519

$ 30,631

$ 16,052

Share-based Compensation, Stock Options, Activity [Table Text Block]

A summary of PSP activity for the years ended December 31, 2018, 2017 and 2016 is as follows:



	Weighted- average grant date fair value		Granted shares		Awarded shares		Shares not yet awarded
Outstanding at January 1, 2016	$	4.52	3,204,428		3,188,428		16,000
Granted	$	—	—		—		—
Awarded	$	—	—		8,000		(8,000	)
Vested	$	3.19	(1,012,844	)	(1,012,844	)	—
Forfeited	$	5.26	(185,034	)	(177,034	)	(8,000	)
Outstanding at December 31, 2016	$	5.11	2,006,550		2,006,550		—
Granted	$	—	—		—		—
Awarded	$	—	—		—		—
Vested	$	4.81	(277,602	)	(277,602	)	—
Forfeited	$	5.24	(34,472	)	(34,472	)	—
Outstanding at December 31, 2017	$	5.16	1,694,476		1,694,476		—
Granted	$	—	—		—		—
Awarded	$	—	—		—		—
Vested	$	5.53	(453,860	)	(453,860	)	—
Forfeited	$	4.92	(44,524	)	(44,524	)	—
Outstanding at December 31, 2018	$	5.03	1,196,092		1,196,092		—

A summary of SIP activity for the years ended December 31, 2018, 2017 and 2016 is as follows:



	Weighted- average grant date fair value		Granted shares		Awarded shares		Shares not yet awarded
Outstanding at January 1, 2016	$	14.37	12,553,944		2,259,988		10,293,956
Granted	$	17.76	1,944,198		365,306		1,578,892		⁽¹⁾
Awarded	$	12.46	—		2,862,638		(2,862,638	)
Vested	$	13.66	(333,768	)	(333,768	)	—
Forfeited	$	12.67	(1,908,262	)	(351,576	)	(1,556,686	)
Outstanding at December 31, 2016	$	14.98	12,256,112		4,802,588		7,453,524
Granted	$	20.82	1,392,912		241,334		1,151,578		⁽²⁾
Awarded	$	15.72	—		326,808		(326,808	)
Vested	$	12.61	(484,914	)	(484,914	)	—
Forfeited	$	14.89	(342,120	)	(76,212	)	(265,908	)
Outstanding at December 31, 2017	$	15.58	12,821,990		4,809,604		8,012,386
Granted	$	22.87	1,577,721		454,313		1,123,408		⁽³⁾
Awarded	$	15.89	—		2,489,905		(2,489,905	)
Vested	$	14.09	(933,916	)	(933,916	)	—
Forfeited	$	16.37	(2,363,420	)	(224,587	)	(2,138,833	)
Outstanding at December 31, 2018	$	16.69	11,102,375		6,595,319		4,507,056

Stock Incentive Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based Compensation

$ 28,027

24,899

11,049

PerformanceStockPlan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based Compensation

748

1,707

1,305

Employee Stock [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based Compensation

$ 4,744

$ 4,025

$ 3,698

Stock Based Compensation Summary of Stock Based Compensation Plan Activity (Tables)

12 Months Ended

Dec. 31, 2018

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Share-based Compensation, Stock Options, Activity [Table Text Block]

A summary of PSP activity for the years ended December 31, 2018, 2017 and 2016 is as follows:



	Weighted- average grant date fair value		Granted shares		Awarded shares		Shares not yet awarded
Outstanding at January 1, 2016	$	4.52	3,204,428		3,188,428		16,000
Granted	$	—	—		—		—
Awarded	$	—	—		8,000		(8,000	)
Vested	$	3.19	(1,012,844	)	(1,012,844	)	—
Forfeited	$	5.26	(185,034	)	(177,034	)	(8,000	)
Outstanding at December 31, 2016	$	5.11	2,006,550		2,006,550		—
Granted	$	—	—		—		—
Awarded	$	—	—		—		—
Vested	$	4.81	(277,602	)	(277,602	)	—
Forfeited	$	5.24	(34,472	)	(34,472	)	—
Outstanding at December 31, 2017	$	5.16	1,694,476		1,694,476		—
Granted	$	—	—		—		—
Awarded	$	—	—		—		—
Vested	$	5.53	(453,860	)	(453,860	)	—
Forfeited	$	4.92	(44,524	)	(44,524	)	—
Outstanding at December 31, 2018	$	5.03	1,196,092		1,196,092		—

A summary of SIP activity for the years ended December 31, 2018, 2017 and 2016 is as follows:



	Weighted- average grant date fair value		Granted shares		Awarded shares		Shares not yet awarded
Outstanding at January 1, 2016	$	14.37	12,553,944		2,259,988		10,293,956
Granted	$	17.76	1,944,198		365,306		1,578,892		⁽¹⁾
Awarded	$	12.46	—		2,862,638		(2,862,638	)
Vested	$	13.66	(333,768	)	(333,768	)	—
Forfeited	$	12.67	(1,908,262	)	(351,576	)	(1,556,686	)
Outstanding at December 31, 2016	$	14.98	12,256,112		4,802,588		7,453,524
Granted	$	20.82	1,392,912		241,334		1,151,578		⁽²⁾
Awarded	$	15.72	—		326,808		(326,808	)
Vested	$	12.61	(484,914	)	(484,914	)	—
Forfeited	$	14.89	(342,120	)	(76,212	)	(265,908	)
Outstanding at December 31, 2017	$	15.58	12,821,990		4,809,604		8,012,386
Granted	$	22.87	1,577,721		454,313		1,123,408		⁽³⁾
Awarded	$	15.89	—		2,489,905		(2,489,905	)
Vested	$	14.09	(933,916	)	(933,916	)	—
Forfeited	$	16.37	(2,363,420	)	(224,587	)	(2,138,833	)
Outstanding at December 31, 2018	$	16.69	11,102,375		6,595,319		4,507,056

Stock Based Compensation Stock Options Outstanding (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-based Compensation, Stock Options, Activity [Table Text Block]

A summary of PSP activity for the years ended December 31, 2018, 2017 and 2016 is as follows:



	Weighted- average grant date fair value		Granted shares		Awarded shares		Shares not yet awarded
Outstanding at January 1, 2016	$	4.52	3,204,428		3,188,428		16,000
Granted	$	—	—		—		—
Awarded	$	—	—		8,000		(8,000	)
Vested	$	3.19	(1,012,844	)	(1,012,844	)	—
Forfeited	$	5.26	(185,034	)	(177,034	)	(8,000	)
Outstanding at December 31, 2016	$	5.11	2,006,550		2,006,550		—
Granted	$	—	—		—		—
Awarded	$	—	—		—		—
Vested	$	4.81	(277,602	)	(277,602	)	—
Forfeited	$	5.24	(34,472	)	(34,472	)	—
Outstanding at December 31, 2017	$	5.16	1,694,476		1,694,476		—
Granted	$	—	—		—		—
Awarded	$	—	—		—		—
Vested	$	5.53	(453,860	)	(453,860	)	—
Forfeited	$	4.92	(44,524	)	(44,524	)	—
Outstanding at December 31, 2018	$	5.03	1,196,092		1,196,092		—

A summary of SIP activity for the years ended December 31, 2018, 2017 and 2016 is as follows:



	Weighted- average grant date fair value		Granted shares		Awarded shares		Shares not yet awarded
Outstanding at January 1, 2016	$	14.37	12,553,944		2,259,988		10,293,956
Granted	$	17.76	1,944,198		365,306		1,578,892		⁽¹⁾
Awarded	$	12.46	—		2,862,638		(2,862,638	)
Vested	$	13.66	(333,768	)	(333,768	)	—
Forfeited	$	12.67	(1,908,262	)	(351,576	)	(1,556,686	)
Outstanding at December 31, 2016	$	14.98	12,256,112		4,802,588		7,453,524
Granted	$	20.82	1,392,912		241,334		1,151,578		⁽²⁾
Awarded	$	15.72	—		326,808		(326,808	)
Vested	$	12.61	(484,914	)	(484,914	)	—
Forfeited	$	14.89	(342,120	)	(76,212	)	(265,908	)
Outstanding at December 31, 2017	$	15.58	12,821,990		4,809,604		8,012,386
Granted	$	22.87	1,577,721		454,313		1,123,408		⁽³⁾
Awarded	$	15.89	—		2,489,905		(2,489,905	)
Vested	$	14.09	(933,916	)	(933,916	)	—
Forfeited	$	16.37	(2,363,420	)	(224,587	)	(2,138,833	)
Outstanding at December 31, 2018	$	16.69	11,102,375		6,595,319		4,507,056

Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities (Tables)

12 Months Ended

Dec. 31, 2018

Supplemental Cash Flow Elements [Abstract]

Summary of Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities

NOTE 13· Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities

The Company’s cash paid during the period for interest and income taxes are summarized as follows:



	Year Ended December 31,
(in thousands)	2018		2017		2016
Cash paid during the period for:
Interest	$	38,032	$	36,172	$	37,652
Income taxes	$	110,557	$	152,024	$	143,111

The Company’s significant non-cash investing and financing activities are summarized as follows:



	Year Ended December 31,
(in thousands)	2018		2017		2016
Other payables issued for purchased customer accounts	$	5,462	$	11,708	$	10,664
Estimated acquisition earn-out payables and related charges	$	77,378	$	6,921	$	4,463
Notes payable issued or assumed for purchased customer accounts	$	—	$	—	$	492
Notes received on the sale of fixed assets and customer accounts	$	52	$	—	$	22

Our Restricted Cash balance is comprised of funds held in separate premium trust accounts as required by state law or, in some cases, per agreement with our carrier partners. The following is a reconciliation of cash and cash equivalents inclusive of restricted cash as of December 31, 2018, 2017 and 2016.



	Balance as of December 31,
(in thousands)	2018		2017		2016
Table to reconcile cash and cash equivalents inclusive of restricted cash
Cash and cash equivalents	$	438,961	$	573,383	515,646
Restricted cash	338,635		250,705		265,637
Total cash and cash equivalents inclusive of restricted cash at the end of the period	$	777,596	$	824,088	781,283

Quarterly Operating Results (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

Quarterly operating results for 2018 and 2017 were as follows:



(in thousands, except per share data)	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
2018
Total revenues	$	501,461	$	473,187	$	530,850	$	508,748
Total expenses	$	383,020	$	372,277	$	388,350	$	408,137
Income before income taxes	$	118,441	$	100,910	$	142,500	$	100,611
Net income	$	90,828	$	73,922	$	106,053	$	73,452
Net income per share:
Basic	$	0.33	$	0.27	$	0.38	$	0.26
Diluted	$	0.32	$	0.26	$	0.38	$	0.26
2017
Total revenues	$	465,080	$	466,305	$	475,646	$	474,316
Total expenses	$	354,113	$	358,303	$	351,227	$	367,982
Income before income taxes	$	110,967	$	108,002	$	124,419	$	106,334
Net income	$	70,110	$	66,102	$	75,913	$	187,505
Net income per share:
Basic⁽¹⁾	$	0.25	$	0.24	$	0.27	$	0.68
Diluted⁽¹⁾	$	0.25	$	0.23	$	0.27	$	0.66	⁽²⁾

Segment Information (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting Information [Line Items]

Segment Information



	Year ended December 31, 2018
(in thousands)	Retail		National Programs		Wholesale Brokerage		Services		Other			Total
Total revenues	$	1,042,763	$	494,463	$	287,014	$	189,246	$	760		$	2,014,246
Investment income	$	2	$	506	$	165	$	205	$	1,868		$	2,746
Amortization	$	44,386	$	25,954	$	11,391	$	4,813	$	—		$	86,544
Depreciation	$	5,289	$	5,486	$	1,628	$	1,558	$	8,873		$	22,834
Interest expense	$	35,969	$	26,181	$	5,254	$	2,869	$	(29,693	)	$	40,580
Income before income taxes	$	217,845	$	117,375	$	70,171	$	34,508	$	22,563		$	462,462
Total assets	$	5,850,045	$	2,940,097	$	1,283,877	$	471,572	$	(3,856,923	)	$	6,688,668
Capital expenditures	$	6,858	$	12,391	$	2,518	$	1,525	$	18,228		$	41,520



	Year ended December 31, 2017
(in thousands)	Retail		National Programs		Wholesale Brokerage		Services		Other			Total
Total revenues	$	943,460	$	479,813	$	271,737	$	165,372	$	20,965		$	1,881,347
Investment income	$	8	$	384	$	—	$	299	$	935		$	1,626
Amortization	$	42,164	$	27,277	$	11,456	$	4,548	$	1		$	85,446
Depreciation	$	5,210	$	6,325	$	1,885	$	1,600	$	7,678		$	22,698
Interest expense	$	31,133	$	35,561	$	6,263	$	3,522	$	(38,163	)	$	38,316
Income before income taxes	$	196,616	$	109,961	$	68,844	$	30,498	$	43,803		$	449,722
Total assets	$	4,255,515	$	3,267,486	$	1,260,239	$	399,240	$	(3,434,930	)	$	5,747,550
Capital expenditures	$	4,494	$	5,936	$	1,836	$	1,033	$	10,893		$	24,192



	Year ended December 31, 2016
(in thousands)	Retail		National Programs		Wholesale Brokerage		Services		Other			Total
Total revenues	$	917,406	$	448,516	$	243,103	$	156,365	$	1,239		$	1,766,629
Investment income	$	37	$	628	$	4	$	283	$	504		$	1,456
Amortization	$	43,447	$	27,920	$	10,801	$	4,485	$	10		$	86,663
Depreciation	$	6,191	$	7,868	$	1,975	$	1,881	$	3,088		$	21,003
Interest expense	$	38,216	$	45,738	$	3,976	$	4,950	$	(53,399	)	$	39,481
Income before income taxes	$	188,001	$	91,762	$	62,623	$	24,338	$	56,775		$	423,499
Total assets⁽¹⁾	$	3,854,393	$	2,711,378	$	1,108,829	$	371,645	$	(2,783,511	)	$	5,262,734
Capital expenditures	$	5,951	$	6,977	$	1,301	$	656	$	2,880		$	17,765

Revenue Recognition (Details) - USD ($)	3 Months Ended								12 Months Ended
Revenue Recognition (Details) - USD ($)	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue from External Customer [Line Items]
Contract with Customer, Liability, Current	$ 37,000,000.0				$ 44,500,000				$ 37,000,000.0	$ 44,500,000
Contract with Customer, Liability, Noncurrent	16,500,000				6,700,000				16,500,000	6,700,000
Contract with Customer, Asset, Net	265,994,000				210,323,000				265,994,000	210,323,000
Insurance Commissions									1,362,037,000
Fees and Commissions, Other									530,838,000
Incentive Commission									51,146,000
Contingent commissions									55,875,000
Guaranteed Supplemental Commissions									9,961,000
Investment income									2,746,000	1,626,000	$ 1,456,000
Other income, net									1,643,000	22,451,000	2,386,000
Revenues	508,748,000	$ 530,850,000	$ 473,187,000	$ 501,461,000	474,316,000	$ 475,646,000	$ 466,305,000	$ 465,080,000	2,014,246,000	1,881,347,000	1,766,629,000
Contract with Customer, Liability	53,496,000				$ 51,236,000				53,496,000	51,236,000
Deferred Revenue, Revenue Recognized									8,900,000
Operating Segments [Member] \| Retail [Member]
Revenue from External Customer [Line Items]
Insurance Commissions									811,820,000
Fees and Commissions, Other									148,121,000
Incentive Commission									48,698,000
Contingent commissions									24,517,000
Guaranteed Supplemental Commissions									8,535,000
Investment income									2,000	8,000	37,000
Other income, net									1,070,000
Revenues									1,042,763,000	943,460,000	917,406,000
Operating Segments [Member] \| Various [Member]
Revenue from External Customer [Line Items]
Insurance Commissions									(68,000)
Fees and Commissions, Other									(1,090,000)
Incentive Commission									41,000
Contingent commissions									0
Guaranteed Supplemental Commissions									0
Investment income									1,868,000
Other income, net									9,000
Revenues									760,000
Operating Segments [Member] \| Services
Revenue from External Customer [Line Items]
Insurance Commissions									0
Fees and Commissions, Other									189,041,000
Incentive Commission									0
Contingent commissions									0
Guaranteed Supplemental Commissions									0
Investment income									205,000	299,000	283,000
Other income, net									0
Revenues									189,246,000	165,372,000	156,365,000
Operating Segments [Member] \| Wholesale Brokerage [Member]
Revenue from External Customer [Line Items]
Insurance Commissions									226,117,000
Fees and Commissions, Other									50,571,000
Incentive Commission									864,000
Contingent commissions									7,462,000
Guaranteed Supplemental Commissions									1,350,000
Investment income									165,000	0	4,000
Other income, net									485,000
Revenues									287,014,000	271,737,000	243,103,000
Operating Segments [Member] \| National Programs
Revenue from External Customer [Line Items]
Insurance Commissions									324,168,000
Fees and Commissions, Other									144,195,000
Incentive Commission									1,543,000
Contingent commissions									23,896,000
Guaranteed Supplemental Commissions									76,000
Investment income									506,000	384,000	628,000
Other income, net									79,000
Revenues									494,463,000	$ 479,813,000	$ 448,516,000
Two Thousand Eighteen Acquisition [Member]
Revenue from External Customer [Line Items]
Contract with Customer, Asset, Net	34,300,000								34,300,000
Contract with Customer, Liability	$ 3,300,000								$ 3,300,000

New Accounting Pronouncements (Details) - USD ($)	3 Months Ended								12 Months Ended
New Accounting Pronouncements (Details) - USD ($)	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Insurance Commissions and Fees									$ 2,009,857,000	$ 1,857,270,000	$ 1,762,787,000
Premiums Commissions And Fees Receivable	$ 844,815,000				$ 546,402,000				844,815,000	546,402,000		$ 699,460,000
Net Cash Provided by (Used in) Operating Activities, Continuing Operations									567,529,000	441,975,000	411,042,000
Insurance Commissions									1,362,037,000
Fees and Commissions, Other									(530,838,000)
Other Assets, Current	128,716,000				47,864,000				128,716,000	47,864,000		100,544,000
Premiums Payable To Insurance Companies	857,559,000				685,163,000				857,559,000	685,163,000		697,270,000
Accounts Payable, Current	87,345,000				64,177,000				87,345,000	64,177,000		72,924,000
Accrued Liabilities, Current	279,310,000				228,748,000				279,310,000	228,748,000		251,542,000
Deferred Tax Liabilities, Net, Noncurrent	315,732,000				256,185,000				315,732,000	256,185,000		300,760,000
Retained Earnings (Accumulated Deficit)	2,833,622,000				2,456,599,000				2,833,622,000	2,456,599,000		2,574,114,000
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification									(18,399,000)
Employee Compensation And Benefits									1,068,914,000	994,652,000	925,217,000
Other Cost and Expense, Operating									332,118,000	283,470,000	262,872,000
Income Tax Expense (Benefit)									118,207,000	50,092,000	166,008,000
Net Income (Loss) Attributable to Parent	73,452,000	$ 106,053,000	$ 73,922,000	$ 90,828,000	187,505,000	$ 75,913,000	$ 66,102,000	$ 70,110,000	344,255,000	399,630,000	257,491,000
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income									12,367,000
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Insurance Commissions and Fees									1,991,458,000
Employee Compensation And Benefits									1,077,749,000
Other Cost and Expense, Operating									321,497,000
Income Tax Expense (Benefit)									113,961,000
Net Income (Loss) Attributable to Parent									331,888,000
Accounting Standards Update 2016-18 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations											375,200,000
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Insurance Commissions									9,900,000
Profit-Sharing Contingent Commission Revenue									(2,300,000)
Fees and Commissions, Other									6,200,000
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption												117,500,000
Net Income (Loss) Attributable to Parent									344,255,000	399,630,000	$ 257,491,000
Retained Earnings [Member] \| Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption					117,515,000					117,515,000
Services [Member] \| Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Fees and Commissions, Other									10,500,000
Various [Member] \| Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Fees and Commissions, Other									(4,300,000)
Accounts Payable [Member] \| Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption					8,747,000					8,747,000
Accrued Liabilities [Member] \| Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption					22,794,000					22,794,000
Deferred Income Tax Charge [Member] \| Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption					44,575,000					44,575,000
Cost to Obtain [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Costs	$ 13,700,000								13,700,000
Capitalized Contract Cost, Amortization									500,000
Employee Compensation and Benefits [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification									8,835,000
Operating Expense [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification									(10,621,000)
Income Tax Expense [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification									4,246,000
Cost to Fulfill [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Costs												$ 52,700,000
Capitalized Contract Cost, Amortization									$ 1,300,000
Premiums Receivable [Member] \| Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption					153,058,000					153,058,000
Other Current Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption					52,700,000					52,700,000
Other Current Assets [Member] \| Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption					$ 52,680,000					$ 52,680,000

Basis of Financial Reporting Revenue Disclosures (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Regulatory Liability [Domain]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 12,100
Regulatory Liability [Domain] \| Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	12,107
Accounts Payable [Member] \| Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	8,747
Accrued Liabilities [Member] \| Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	22,794
Deferred Income Tax Charge [Member] \| Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 44,575

Net Income Per Share - Reconciliation between Basic and Diluted Weighted Average Shares Outstanding (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income	$ 73,452	$ 106,053	$ 73,922	$ 90,828	$ 187,505	$ 75,913	$ 66,102	$ 70,110	$ 344,255	$ 399,630	$ 257,491
Net income attributable to unvested awarded performance stock									(8,297)	(9,746)	(6,705)
Net income attributable to common shares									$ 335,958	$ 389,884	$ 250,786
Weighted average number of common shares outstanding - basic (in shares)									277,663	279,394	279,558
Less unvested awarded performance stock included in weighted average number of common shares outstanding - basic (in shares)									(6,692)	(6,814)	(7,280)
Weighted average number of common shares outstanding for basic earnings per common share (in shares)									270,971	272,580	272,278
Dilutive effect of stock options (in shares)									4,550	5,006	3,330
Weighted average number of shares outstanding - diluted (in shares)									275,521	277,586	275,608
Basic (in dollars per share)	$ 0.0026	$ 0.0038	$ 0.0027	$ 0.0033	$ 0.0068	$ 0.0027	$ 0.0024	$ 0.0025	$ 1.24	$ 1.43	$ 0.92
Diluted (in dollars per share)	$ 0.0026	$ 0.0038	$ 0.0026	$ 0.0032	$ 0.0066	$ 0.0027	$ 0.0023	$ 0.0025	$ 1.22	$ 1.40	$ 0.91

Business Combinations - Additional Information (Detail) $ / shares in Units, shares in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) acquisition customer_account	Dec. 31, 2017 USD ($) acquisition $ / shares shares	Dec. 31, 2016 USD ($) acquisition $ / shares shares	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	$ 11,054,000		$ 2,094,000
Maximum Future Contingency payments Acquisitions	$ 198,600,000
Number of acquisitions \| acquisition	23	11
Aggregate purchase price of acquisitions	$ 21,400	$ 1,500,000	917,497
Payments to Acquire Businesses, Gross	$ 934,928,000	41,471,000	124,716,000
Document Period End Date	Dec. 31, 2018
Stock Issued During Period, Value, Acquisitions	$ 100,000,000
Goodwill currently deductible for income tax purposes	640,300,000	35,300,000	88,900,000
Goodwill currently non-deductible for income tax purposes	77,400,000
Goodwill related to the recorded earn-out payables		6,900,000	4,500,000
Total revenues related to acquisitions	82,400,000	7,800,000	34,200,000
Income before income taxes related to acquisitions	6,300,000	2,400,000	4,300,000
Estimated acquisition earn-out payables	89,924,000	36,175,000	63,821,000	$ 78,387,000
Other Payable	5,462,000	11,708,000	10,664,000
Business Acquisitions Contingent Consideration At Fair Value	77,377,000	6,921,000	4,462,000
Net Assets Acquired	1,117,767,000	60,100,000	140,334,000
Maximum Potential Earn- Out Payable	147,668,000	27,451,000	16,285,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	52,917,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	5,829,000	69,000	684,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	342,008,000	18,738,000	50,625,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	3,222,000	721,000	228,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	18,588,000		20,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	1,151,328,000	62,301,000	152,106,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	(32,996,000)	(1,512,000)	(8,542,000)
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	(565,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(33,561,000)	(2,201,000)	(11,772,000)
Accounts payable
Business Acquisition [Line Items]
Estimated acquisition earn-out payables	$ 21,100,000	$ 25,100,000	$ 31,800,000
Purchased customer accounts
Business Acquisition [Line Items]
Weighted average life (years)	15 years	15 years	15 years
Non-compete agreements
Business Acquisition [Line Items]
Weighted average life (years)	5 years	5 years	5 years
Other non-current liability
Business Acquisition [Line Items]
Estimated acquisition earn-out payables	$ 68,800,000	$ 11,100,000	$ 32,000,000.0
Social Security Advocates for the Disabled LLC [Member]
Business Acquisition [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents			2,094,000
Net Assets Acquired			33,989,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment			307,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets			13,069,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross			72,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets			0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets			38,936,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other			(1,717,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities			(4,947,000)
Social Security Advocates for the Disabled LLC [Member] \| Services [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross			32,526,000
Other Payable			0
Business Acquisitions Contingent Consideration At Fair Value			971,000
Net Assets Acquired			33,989,000
Maximum Potential Earn- Out Payable			3,500,000
Morstan General Agency, Inc [Member]
Business Acquisition [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents			0
Net Assets Acquired			79,341,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment			300,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets			26,481,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross			39,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets			0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets			80,756,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other			(1,415,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities			(1,415,000)
Morstan General Agency, Inc [Member] \| Wholesale Brokerage [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross			66,050,000
Other Payable			10,200,000
Business Acquisitions Contingent Consideration At Fair Value			3,091,000
Net Assets Acquired			79,341,000
Maximum Potential Earn- Out Payable			$ 5,000,000
Asset Acquisitions [Member]
Business Acquisition [Line Items]
Number of acquisitions \| acquisition	20	11	7
Stock Acquisitions [Member]
Business Acquisition [Line Items]
Number of acquisitions \| acquisition			1
Stock Purchases [Member]
Business Acquisition [Line Items]
Number of acquisitions \| customer_account	3
Book of Business Purchases [Member]
Business Acquisition [Line Items]
Number of acquisitions	1	1	3
Other Acquisitions [Member] \| Various [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross		$ 41,471,000	$ 26,140,000
Other Payable		11,708,000	464,000
Business Acquisitions Contingent Consideration At Fair Value		6,921,000	400,000
Net Assets Acquired		60,100,000	27,004,000
Maximum Potential Earn- Out Payable		27,451,000	7,785,000
Other Acquisitions [Member]
Business Acquisition [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	$ 0
Net Assets Acquired	22,984,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	1,215,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	11,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	5,008,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	21,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	315,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	22,984,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	0
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	0
Other Acquisitions [Member] \| Retail [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	20,400,000
Stock Issued During Period, Value, Acquisitions	0
Other Payable	200,000
Business Acquisitions Contingent Consideration At Fair Value	2,384,000
Net Assets Acquired	22,984,000
Maximum Potential Earn- Out Payable	3,600,000
Kerxton [Member]
Business Acquisition [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	0
Net Assets Acquired	16,746,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	663,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	10,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	4,712,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	22,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	419,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	18,249,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	(1,503,000)
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(1,503,000)
Kerxton [Member] \| Retail [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	13,176,000
Stock Issued During Period, Value, Acquisitions	0
Other Payable	1,490,000
Business Acquisitions Contingent Consideration At Fair Value	2,080,000
Net Assets Acquired	16,746,000
Maximum Potential Earn- Out Payable	2,920,000
ADG [Member]
Business Acquisition [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	0
Net Assets Acquired	47,575,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	1,500,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	67,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	9,751,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	21,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	467,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	47,575,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	0
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	0
ADG [Member] \| Retail [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	29,471,000
Stock Issued During Period, Value, Acquisitions	0
Other Payable	559,000
Business Acquisitions Contingent Consideration At Fair Value	17,545,000
Net Assets Acquired	47,575,000
Maximum Potential Earn- Out Payable	20,000,000
Servco [Member]
Business Acquisition [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	8,188,000
Net Assets Acquired	77,179,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	7,769,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	179,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	16,442,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	1,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	1,478,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	88,486,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	(11,307,000)
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(11,307,000)
Servco [Member] \| Retail [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	76,245,000
Stock Issued During Period, Value, Acquisitions	0
Other Payable	0
Business Acquisitions Contingent Consideration At Fair Value	934,000
Net Assets Acquired	77,179,000
Maximum Potential Earn- Out Payable	7,000,000
Tower Hill [Member]
Business Acquisition [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	0
Net Assets Acquired	21,488,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	0
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	21,468,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	20,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	21,488,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	0
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	0
Tower Hill [Member] \| National Programs
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	20,300,000
Stock Issued During Period, Value, Acquisitions	0
Other Payable	0
Business Acquisitions Contingent Consideration At Fair Value	1,188,000
Net Assets Acquired	21,488,000
Maximum Potential Earn- Out Payable	7,700,000
HSR [Member]
Business Acquisition [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	3,114,000
Net Assets Acquired	22,123,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	818,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	124,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	5,516,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	65,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	21,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	28,395,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	(5,930,000)
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	(342,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(6,272,000)
HSR [Member] \| National Programs
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	20,132,000
Stock Issued During Period, Value, Acquisitions	0
Other Payable	0
Business Acquisitions Contingent Consideration At Fair Value	1,991,000
Net Assets Acquired	22,123,000
Maximum Potential Earn- Out Payable	9,000,000
PDA [Member]
Business Acquisition [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	(248,000)
Net Assets Acquired	24,843,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	1,762,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	310,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	7,700,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	82,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	6,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	26,159,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	(1,093,000)
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	(223,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(1,316,000)
PDA [Member] \| Services [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	15,025,000
Stock Issued During Period, Value, Acquisitions	0
Other Payable	0
Business Acquisitions Contingent Consideration At Fair Value	9,818,000
Net Assets Acquired	24,843,000
Maximum Potential Earn- Out Payable	17,975,000
F&I [Member]
Business Acquisition [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	0
Net Assets Acquired	54,471,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	999,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	34,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	16,611,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	21,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	383,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	54,471,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	0
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	0
F&I [Member] \| Retail [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	44,940,000
Stock Issued During Period, Value, Acquisitions	0
Other Payable	410,000
Business Acquisitions Contingent Consideration At Fair Value	9,121,000
Net Assets Acquired	54,471,000
Maximum Potential Earn- Out Payable	19,500,000
Rodman [Member]
Business Acquisition [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	0
Net Assets Acquired	35,102,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	1,062,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	45,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	10,129,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	51,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	542,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	38,401,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	(3,299,000)
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(3,299,000)
Rodman [Member] \| Retail [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	31,121,000
Stock Issued During Period, Value, Acquisitions	0
Other Payable	261,000
Business Acquisitions Contingent Consideration At Fair Value	3,720,000
Net Assets Acquired	35,102,000
Maximum Potential Earn- Out Payable	9,850,000
Hays [Member]
Business Acquisition [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	0
Net Assets Acquired	724,600,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	36,254,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	4,936,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	218,600,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	2,600,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	13,977,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	732,584,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	(7,984,000)
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(7,984,000)
Hays [Member] \| Retail [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	605,000,000
Stock Issued During Period, Value, Acquisitions	100,000,000
Other Payable	0
Business Acquisitions Contingent Consideration At Fair Value	19,600,000
Net Assets Acquired	724,600,000
Maximum Potential Earn- Out Payable	25,000,000
Dealer Associates [Member]
Business Acquisition [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	0
Net Assets Acquired	33,100,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	552,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	13,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	10,986,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	21,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	226,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	33,265,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	(165,000)
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(165,000)
Dealer Associates [Member] \| Retail [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	28,825,000
Stock Issued During Period, Value, Acquisitions	0
Other Payable	1,175,000
Business Acquisitions Contingent Consideration At Fair Value	3,100,000
Net Assets Acquired	33,100,000
Maximum Potential Earn- Out Payable	12,125,000
Various [Member]
Business Acquisition [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	0		0
Net Assets Acquired	37,556,000		27,004,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	323,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	100,000		77,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	15,085,000		11,075,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	297,000		117,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	754,000		20,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	39,271,000		32,414,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	(1,715,000)		(5,410,000)
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(1,715,000)		(5,410,000)
Various [Member] \| Various [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	30,293,000
Stock Issued During Period, Value, Acquisitions	0
Other Payable	1,367,000
Business Acquisitions Contingent Consideration At Fair Value	5,896,000
Net Assets Acquired	37,556,000
Maximum Potential Earn- Out Payable	$ 12,998,000
Two Thousand Seventeen Acquisition [Member] [Domain]
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue		1,891,701,000	1,784,776,000
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax		453,397,000	429,490,000
Business Acquisition, Pro Forma Net Income (Loss)		$ 401,908,000	$ 261,133,000
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax, Per Share, Basic \| $ / shares		$ 1.44	$ 0.93
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax, Per Share, Diluted \| $ / shares		$ 1.41	$ 0.92
Weighted Average Basic Shares Outstanding, Pro Forma \| shares		272,580	272,278
Pro Forma Weighted Average Shares Outstanding, Diluted \| shares		277,586	275,608

Business Combinations - Acquisitions Accounted for Business Combinations (Detail) - USD ($) $ / shares in Units, shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Combination, Separately Recognized Transactions [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	$ 11,054,000		$ 2,094,000
Cash Paid	934,928,000	$ 41,471,000	124,716,000
Stock Issued During Period, Value, Acquisitions	100,000,000
Other Payable	5,462,000	11,708,000	10,664,000
Recorded Earn-Out Payable	77,377,000	6,921,000	4,462,000
Net Assets Acquired	1,117,767,000	60,100,000	140,334,000
Maximum Potential Earn- Out Payable	147,668,000	27,451,000	16,285,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	52,917,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	5,829,000	69,000	684,000
Goodwill, Fair Value Disclosure	717,710,000	42,172,000	93,376,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	342,008,000	18,738,000	50,625,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	3,222,000	721,000	228,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	18,588,000		20,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	1,151,328,000	62,301,000	152,106,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	32,996,000	1,512,000	8,542,000
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	565,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	33,561,000	2,201,000	11,772,000
National Programs
Business Combination, Separately Recognized Transactions [Line Items]
Goodwill, Fair Value Disclosure	18,700,000	7,200,000	57,900,000
Retail
Business Combination, Separately Recognized Transactions [Line Items]
Goodwill, Fair Value Disclosure	676,900,000	33,100,000	13,100,000
Wholesale Brokerage [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Goodwill, Fair Value Disclosure	5,500,000	1,200,000	(1,200)
Services [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Goodwill, Fair Value Disclosure	16,500,000	700,000	22,400,000
Dealer Associates [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	0
Net Assets Acquired	33,100,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	552,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	13,000
Goodwill, Fair Value Disclosure	21,467,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	10,986,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	21,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	226,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	33,265,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	165,000
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	165,000
Dealer Associates [Member] \| Retail
Business Combination, Separately Recognized Transactions [Line Items]
Cash Paid	28,825,000
Stock Issued During Period, Value, Acquisitions	0
Other Payable	1,175,000
Recorded Earn-Out Payable	3,100,000
Net Assets Acquired	33,100,000
Maximum Potential Earn- Out Payable	12,125,000
Tower Hill [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	0
Net Assets Acquired	21,488,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	0
Goodwill, Fair Value Disclosure	0
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	21,468,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	20,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	21,488,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	0
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	0
Tower Hill [Member] \| National Programs
Business Combination, Separately Recognized Transactions [Line Items]
Cash Paid	20,300,000
Stock Issued During Period, Value, Acquisitions	0
Other Payable	0
Recorded Earn-Out Payable	1,188,000
Net Assets Acquired	21,488,000
Maximum Potential Earn- Out Payable	7,700,000
HSR [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	3,114,000
Net Assets Acquired	22,123,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	818,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	124,000
Goodwill, Fair Value Disclosure	18,737,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	5,516,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	65,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	21,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	28,395,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	5,930,000
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	342,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	6,272,000
HSR [Member] \| National Programs
Business Combination, Separately Recognized Transactions [Line Items]
Cash Paid	20,132,000
Stock Issued During Period, Value, Acquisitions	0
Other Payable	0
Recorded Earn-Out Payable	1,991,000
Net Assets Acquired	22,123,000
Maximum Potential Earn- Out Payable	9,000,000
PDA [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	(248,000)
Net Assets Acquired	24,843,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	1,762,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	310,000
Goodwill, Fair Value Disclosure	16,547,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	7,700,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	82,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	6,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	26,159,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	1,093,000
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	223,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	1,316,000
PDA [Member] \| Services [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Cash Paid	15,025,000
Stock Issued During Period, Value, Acquisitions	0
Other Payable	0
Recorded Earn-Out Payable	9,818,000
Net Assets Acquired	24,843,000
Maximum Potential Earn- Out Payable	17,975,000
Opus [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	0
Net Assets Acquired	22,984,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	1,215,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	11,000
Goodwill, Fair Value Disclosure	16,414,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	5,008,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	21,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	315,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	22,984,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	0
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	0
Opus [Member] \| Retail
Business Combination, Separately Recognized Transactions [Line Items]
Cash Paid	20,400,000
Stock Issued During Period, Value, Acquisitions	0
Other Payable	200,000
Recorded Earn-Out Payable	2,384,000
Net Assets Acquired	22,984,000
Maximum Potential Earn- Out Payable	3,600,000
F&I [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	0
Net Assets Acquired	54,471,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	999,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	34,000
Goodwill, Fair Value Disclosure	36,423,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	16,611,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	21,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	383,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	54,471,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	0
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	0
F&I [Member] \| Retail
Business Combination, Separately Recognized Transactions [Line Items]
Cash Paid	44,940,000
Stock Issued During Period, Value, Acquisitions	0
Other Payable	410,000
Recorded Earn-Out Payable	9,121,000
Net Assets Acquired	54,471,000
Maximum Potential Earn- Out Payable	19,500,000
Kerxton [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	0
Net Assets Acquired	16,746,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	663,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	10,000
Goodwill, Fair Value Disclosure	12,423,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	4,712,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	22,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	419,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	18,249,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	1,503,000
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	1,503,000
Kerxton [Member] \| Retail
Business Combination, Separately Recognized Transactions [Line Items]
Cash Paid	13,176,000
Stock Issued During Period, Value, Acquisitions	0
Other Payable	1,490,000
Recorded Earn-Out Payable	2,080,000
Net Assets Acquired	16,746,000
Maximum Potential Earn- Out Payable	2,920,000
Rodman [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	0
Net Assets Acquired	35,102,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	1,062,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	45,000
Goodwill, Fair Value Disclosure	26,572,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	10,129,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	51,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	542,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	38,401,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	3,299,000
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	3,299,000
Rodman [Member] \| Retail
Business Combination, Separately Recognized Transactions [Line Items]
Cash Paid	31,121,000
Stock Issued During Period, Value, Acquisitions	0
Other Payable	261,000
Recorded Earn-Out Payable	3,720,000
Net Assets Acquired	35,102,000
Maximum Potential Earn- Out Payable	9,850,000
Hays [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	0
Net Assets Acquired	724,600,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	36,254,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	4,936,000
Goodwill, Fair Value Disclosure	456,217,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	218,600,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	2,600,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	13,977,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	732,584,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	7,984,000
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	7,984,000
Hays [Member] \| Retail
Business Combination, Separately Recognized Transactions [Line Items]
Cash Paid	605,000,000
Stock Issued During Period, Value, Acquisitions	100,000,000
Other Payable	0
Recorded Earn-Out Payable	19,600,000
Net Assets Acquired	724,600,000
Maximum Potential Earn- Out Payable	25,000,000
Other Acquisitions [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Goodwill, Fair Value Disclosure	717,700,000
Other Acquisitions [Member] \| Various [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Cash Paid		41,471,000	26,140,000
Other Payable		11,708,000	464,000
Recorded Earn-Out Payable		6,921,000	400,000
Net Assets Acquired		60,100,000	27,004,000
Maximum Potential Earn- Out Payable		27,451,000	7,785,000
Various [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	0		0
Net Assets Acquired	37,556,000		27,004,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	323,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	100,000		77,000
Goodwill, Fair Value Disclosure	22,712,000		19,570,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	15,085,000		11,075,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	297,000		117,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	754,000		20,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	39,271,000		32,414,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	1,715,000		5,410,000
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	1,715,000		5,410,000
Various [Member] \| Various [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Cash Paid	30,293,000
Stock Issued During Period, Value, Acquisitions	0
Other Payable	1,367,000
Recorded Earn-Out Payable	5,896,000
Net Assets Acquired	37,556,000
Maximum Potential Earn- Out Payable	12,998,000
ADG [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	0
Net Assets Acquired	47,575,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	1,500,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	67,000
Goodwill, Fair Value Disclosure	35,769,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	9,751,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	21,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	467,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	47,575,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	0
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	0
ADG [Member] \| Retail
Business Combination, Separately Recognized Transactions [Line Items]
Cash Paid	29,471,000
Stock Issued During Period, Value, Acquisitions	0
Other Payable	559,000
Recorded Earn-Out Payable	17,545,000
Net Assets Acquired	47,575,000
Maximum Potential Earn- Out Payable	20,000,000
Servco [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	8,188,000
Net Assets Acquired	77,179,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	7,769,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	179,000
Goodwill, Fair Value Disclosure	54,429,000
Business Acquisitions Purchase Price Allocation Amortizable Intangible Assets	16,442,000
Business Acquisitions Purchase Price Allocation Noncompete Agreements Gross	1,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	1,478,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	88,486,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	11,307,000
Business Acquisition Purchase Price Allocation Other Liabilities Assumed	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	11,307,000
Servco [Member] \| Retail
Business Combination, Separately Recognized Transactions [Line Items]
Cash Paid	76,245,000
Stock Issued During Period, Value, Acquisitions	0
Other Payable	0
Recorded Earn-Out Payable	934,000
Net Assets Acquired	77,179,000
Maximum Potential Earn- Out Payable	$ 7,000,000
Two Thousand Seventeen Acquisition [Member] [Domain]
Business Combination, Separately Recognized Transactions [Line Items]
Business Acquisition, Pro Forma Revenue		$ 1,891,701,000	$ 1,784,776,000
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted		$ 1.41	$ 0.92
Weighted Average Basic Shares Outstanding, Pro Forma		272,580	272,278
Pro Forma Weighted Average Shares Outstanding, Diluted		277,586	275,608
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax		$ 453,397,000	$ 429,490,000
Business Acquisition, Pro Forma Net Income (Loss)		$ 401,908,000	$ 261,133,000
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax, Per Share, Basic		$ 1.44	$ 0.93

Business Combinations - Estimated Fair Values of Aggregate Assets and Liabilities Acquired (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value Of Assets And Liabilities Statement [Line Items]
Other Payable	$ 5,462,000	$ 11,708,000	$ 10,664,000
Payments to Acquire Businesses, Gross	934,928,000	41,471,000	124,716,000
Recorded Earn-Out Payable	77,377,000	6,921,000	4,462,000
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets	11,054,000		2,094,000
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets		601,000	5,079,000
Fixed assets	5,829,000	69,000	684,000
Goodwill	717,710,000	42,172,000	93,376,000
Purchased customer accounts	342,008,000	18,738,000	50,625,000
Non-compete agreements	3,222,000	721,000	228,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	18,588,000		20,000
Total assets acquired	1,151,328,000	62,301,000	152,106,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	52,917,000
Other current liabilities	(32,996,000)	(1,512,000)	(8,542,000)
Deferred Tax Liabilities, Net		(689,000)	(3,230,000)
Other liabilities	(565,000)
Total liabilities assumed	(33,561,000)	(2,201,000)	(11,772,000)
Net assets acquired	1,117,767,000	60,100,000	140,334,000
Maximum Potential Earn- Out Payable	147,668,000	27,451,000	16,285,000
Social Security Advocates for the Disabled LLC [Member]
Fair Value Of Assets And Liabilities Statement [Line Items]
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets			2,094,000
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets			1,042,000
Fixed assets			307,000
Goodwill			22,352,000
Purchased customer accounts			13,069,000
Non-compete agreements			72,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets			0
Total assets acquired			38,936,000
Other current liabilities			(1,717,000)
Deferred Tax Liabilities, Net			(3,230,000)
Total liabilities assumed			(4,947,000)
Net assets acquired			33,989,000
Various [Member]
Fair Value Of Assets And Liabilities Statement [Line Items]
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets	0		0
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets			1,555,000
Fixed assets	100,000		77,000
Goodwill	22,712,000		19,570,000
Purchased customer accounts	15,085,000		11,075,000
Non-compete agreements	297,000		117,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets	754,000		20,000
Total assets acquired	39,271,000		32,414,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	323,000
Other current liabilities	(1,715,000)		(5,410,000)
Deferred Tax Liabilities, Net			0
Other liabilities	0
Total liabilities assumed	(1,715,000)		(5,410,000)
Net assets acquired	37,556,000		27,004,000
Morstan General Agency, Inc [Member]
Fair Value Of Assets And Liabilities Statement [Line Items]
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets			0
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets			2,482,000
Fixed assets			300,000
Goodwill			51,454,000
Purchased customer accounts			26,481,000
Non-compete agreements			39,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets			0
Total assets acquired			80,756,000
Other current liabilities			(1,415,000)
Deferred Tax Liabilities, Net			0
Total liabilities assumed			(1,415,000)
Net assets acquired			79,341,000
Other Acquisitions [Member]
Fair Value Of Assets And Liabilities Statement [Line Items]
Goodwill	717,700,000
Services
Fair Value Of Assets And Liabilities Statement [Line Items]
Goodwill	16,500,000	700,000	22,400,000
Services \| Social Security Advocates for the Disabled LLC [Member]
Fair Value Of Assets And Liabilities Statement [Line Items]
Other Payable			0
Payments to Acquire Businesses, Gross			32,526,000
Recorded Earn-Out Payable			971,000
Net assets acquired			33,989,000
Maximum Potential Earn- Out Payable			3,500,000
Retail
Fair Value Of Assets And Liabilities Statement [Line Items]
Goodwill	676,900,000	33,100,000	13,100,000
National Programs
Fair Value Of Assets And Liabilities Statement [Line Items]
Goodwill	18,700,000	7,200,000	57,900,000
Wholesale Brokerage
Fair Value Of Assets And Liabilities Statement [Line Items]
Goodwill	$ 5,500,000	$ 1,200,000	(1,200)
Wholesale Brokerage \| Morstan General Agency, Inc [Member]
Fair Value Of Assets And Liabilities Statement [Line Items]
Other Payable			10,200,000
Payments to Acquire Businesses, Gross			66,050,000
Recorded Earn-Out Payable			3,091,000
Net assets acquired			79,341,000
Maximum Potential Earn- Out Payable			$ 5,000,000

Business Combinations - Results of Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	$ 82.4	$ 7.8	$ 34.2
Business Combination Pro Forma Information Income Loss Before Income Taxes Of Acquiree Since Acquisition Date Actual	$ 6.3	$ 2.4	$ 4.3
Two Thousand Seventeen Acquisition [Member] [Domain]
Net income per share:
Basic (in dollars per share)		$ 1.44	$ 0.93
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted		$ 1.41	$ 0.92
Weighted Average Basic Shares Outstanding, Pro Forma		272,580	272,278
Weighted average number of shares outstanding:
Pro Forma Weighted Average Shares Outstanding, Diluted		277,586	275,608

Business Combinations - Additions, Payments, and Net Changes, as well as Interest Expense Accretion on Estimated Acquisition Earn-Out Payables (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Document Period End Date	Dec. 31, 2018
Business Acquisition Cost- Note Payable			$ 492
Beginning balance	$ 36,175	$ 63,821	78,387
Additions to estimated acquisition earn-out payables	77,377	6,920	4,462
Payments for estimated acquisition earn-out payables	26,597	43,766	28,213
Subtotal	86,955	26,975	54,636
Net change in earnings from estimated acquisition earn-out payables:
Change in fair value on estimated acquisition earn-out payables	(603)	(6,874)	(6,338)
Interest expense accretion	2,366	2,326	2,847
Net change in earnings from estimated acquisition earn-out payables	2,969	9,200	9,185
Ending balance	$ 89,924	$ 36,175	63,821
Services \| Social Security Advocates for the Disabled LLC [Member]
Business Acquisition [Line Items]
Business Acquisition Cost- Note Payable			492
Wholesale Brokerage [Member] \| Morstan General Agency, Inc [Member]
Business Acquisition [Line Items]
Business Acquisition Cost- Note Payable			0
Various [Member] \| Other Acquisitions [Member]
Business Acquisition [Line Items]
Business Acquisition Cost- Note Payable			$ 0

Business Combinations Business Acquisitions - Pro-forma Table (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Two Thousand Sixteen Acquisition [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Weighted Average Basic Shares Outstanding, Pro Forma			272,278	275,620
Business Acquisition, Pro Forma Revenue			$ 1,789,790	$ 1,716,592
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax			428,194	414,911
Business Acquisition, Pro Forma Net Income (Loss)			$ 260,346	$ 250,783
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax, Per Share, Basic			$ 0.93	$ 0.89
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted			$ 0.92	$ 0.87
Pro Forma Weighted Average Shares Outstanding, Diluted			275,608	280,224
Two Thousand Eighteen Acquisition [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Weighted Average Basic Shares Outstanding, Pro Forma	270,971	272,580
Business Acquisition, Pro Forma Revenue	$ 2,259,812	$ 2,193,169
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax	504,664	503,927
Business Acquisition, Pro Forma Net Income (Loss)	$ 375,670	$ 447,796
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax, Per Share, Basic	$ 1.35	$ 1.60
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted	$ 1.33	$ 1.57
Pro Forma Weighted Average Shares Outstanding, Diluted	275,521	277,586

Goodwill - Changes in Carrying Value of Goodwill by Operating Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Beginning balance	$ 2,716,079	$ 2,675,402
Goodwill of acquired businesses	717,710	42,172
Goodwill disposed of relating to sales of businesses	(1,003)	(1,495)
Ending balance	3,432,786	2,716,079
Retail
Goodwill [Roll Forward]
Beginning balance	1,386,248	1,354,667
Goodwill of acquired businesses	676,902	33,076
Goodwill disposed of relating to sales of businesses	0	(1,495)
Ending balance	2,063,150	1,386,248
National Programs
Goodwill [Roll Forward]
Beginning balance	908,472	901,294
Goodwill of acquired businesses	18,737	7,178
Goodwill disposed of relating to sales of businesses	(1,003)	0
Ending balance	926,206	908,472
Wholesale Brokerage
Goodwill [Roll Forward]
Beginning balance	286,098	284,869
Goodwill of acquired businesses	5,524	1,229
Goodwill disposed of relating to sales of businesses	0	0
Ending balance	291,622	286,098
Services
Goodwill [Roll Forward]
Beginning balance	135,261	134,572
Goodwill of acquired businesses	16,547	689
Goodwill disposed of relating to sales of businesses	0	0
Ending balance	$ 151,808	$ 135,261

Amortizable Intangible Assets - Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 1,837,873	$ 1,494,561
Accumulated Amortization	(939,066)	(853,556)
Net Carrying Value	898,807	641,005
Purchased customer accounts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1,804,404	1,464,274
Accumulated Amortization	(909,415)	(824,584)
Net Carrying Value	$ 894,989	$ 639,690
Weighted Average Life (Years)	14 years 10 months 24 days	15 years
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 33,469	$ 30,287
Accumulated Amortization	(29,651)	(28,972)
Net Carrying Value	$ 3,818	$ 1,315
Weighted Average Life (Years)	4 years 6 months	4 years 7 months 6 days

Amortizable Intangible Assets - Additional Information (Detail) $ in Millions	Dec. 31, 2018 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense estimated, year one (2015)	$ 100.4
Amortization expense estimated, year two (2016)	93.0
Amortization expense estimated, year three (2017)	89.5
Amortization expense estimated, year four (2018)	85.0
Amortization expense estimated, year five (2019)	$ 78.0

Investments - Schedule of Investments in Fixed Maturity Securities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Proceeds from Sale, Maturity and Collection of Investments	$ 17,923	$ 9,644	$ 18,890
Cost	22,352	31,042
Gross Unrealized Gains	7	12
Gross Unrealized Losses	(222)	(206)
Fair Value	22,137	30,848
Payments to Acquire Investments	9,284	$ 10,665	$ 25,872
Short-term Debt [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	$ 4,800

Investments - Summary of Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	$ 22,352	$ 31,042
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	7	12
Fair Value, Less than 12 Months	6,323	18,319
Unrealized Losses, Less than 12 Months	(6)	(157)
Fair Value, 12 Months or More	12,734	11,845
Unrealized Losses, 12 Months or More	(216)	(49)
Fair Value	19,057	30,164
Unrealized Losses	(222)	(206)
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(222)	(206)
Available-for-sale Securities	22,137	30,848
U.S. Treasury securities, obligations of U.S. Government agencies and Municipals
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	21,729	29,970
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	7	0
Fair Value, Less than 12 Months	5,866	17,919
Unrealized Losses, Less than 12 Months	(6)	(157)
Fair Value, 12 Months or More	12,634	11,845
Unrealized Losses, 12 Months or More	(216)	(49)
Fair Value	18,500	29,764
Unrealized Losses	(222)	(206)
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(222)	(206)
Available-for-sale Securities	21,514	29,764
Corporate debt
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	623	1,072
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0	12
Fair Value, Less than 12 Months	457	400
Unrealized Losses, Less than 12 Months	0	0
Fair Value, 12 Months or More	100	0
Unrealized Losses, 12 Months or More	0	0
Fair Value	557	400
Unrealized Losses	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities	$ 623	$ 1,084

Investments - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Securities	Dec. 31, 2017 USD ($) Securities
Schedule of Available-for-sale Securities [Line Items]
Short-term Investments	$ 12,868	$ 24,965
Number of securities in unrealized loss position \| Securities	20	27
Proceeds from sale of investment in fixed maturity securities	$ 17,100	$ 5,800
Investments on deposit with the state insurance department	4,100
Time Deposits	$ 8,100

Investments - Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Amortized cost
Due in one year or less	$ 4,768	$ 16,934
Due after one year through five years	17,584	13,876
Due after five years through ten years	0	232
Amortized Cost, Total	22,352	31,042
Fair value
Due in one year or less	4,743	16,899
Due after one year through five years	17,394	13,708
Due after five years through ten years	0	241
Fair Value, Total	$ 22,137	$ 30,848

Fixed Assets (Details) - USD ($) $ in Thousands	12 Months Ended
Fixed Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Depreciation	$ 22,834	$ 22,698	$ 21,003
Property, Plant and Equipment, Gross	268,875	233,908
Development in Process	7,568	0
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(168,480)	(156,822)
Property, Plant and Equipment, Net	100,395	77,086
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	213,928	190,784
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	39,194	35,481
Land, Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 8,185	$ 7,643

Long-Term Debt - Long-Term Debt Instrument (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	May 10, 2018	Dec. 31, 2017	Dec. 22, 2016	Sep. 15, 2011
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Year Five	$ 210,000,000.0
Document Period End Date	Dec. 31, 2018
Total current portion of long-term debt	$ 50,000,000		$ 120,000,000
Total notes	499,101,000		498,943,000
Long-term credit agreements	965,000,000		365,000,000
Debt Issuance Costs, Net	(7,111,000)		(7,802,000)
Total long-term debt	1,456,990,000		856,141,000
Current portion of long-term debt	50,000,000		120,000,000
Total debt	1,506,990,000		976,141,000
5.370% senior notes, Series D, quarterly interest payments, balloon due 2015
Debt Instrument [Line Items]
Current portion of senior notes				$ 25,000,000.0
5.660% senior notes, Series C, semi-annual interest payments, balloon due 2016
Debt Instrument [Line Items]
Current portion of senior notes	0		100,000,000
4.200% Senior Notes, semi-annual interest payments, balloon due 2024
Debt Instrument [Line Items]
Total notes	499,101,000		498,943,000
5-year term loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires June 28, 2022
Debt Instrument [Line Items]
Current portion of loan facility	35,000,000		20,000,000
Long-term credit agreements	330,000,000		365,000,000
5-year revolving loan facility, periodic interest payments, currently LIBOR plus up to 1.500%, plus commitment fees up to 0.250%, expires June 28, 2022
Debt Instrument [Line Items]
Long-term credit agreements	350,000,000		0
Five Year Term Loan Facility Expires in Two Thousand Twenty Three [Member]
Debt Instrument [Line Items]
Current portion of loan facility	15,000,000		0
Long-term credit agreements	$ 285,000,000		$ 0
Master Agreement [Member] \| Series E [Member]
Debt Instrument [Line Items]
Unsecured Debt		$ 100,000,000.0			$ 100,000,000.0

Long-Term Debt - Long-Term Debt Instrument (Additional Information) (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Sep. 15, 2011
5.660% senior notes, Series C, semi-annual interest payments, balloon due 2016
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			4.50%	4.50%
4.500% senior notes, Series E, quarterly interest payments, balloon due 2018
Debt Instrument [Line Items]
Debt instrument maturity year			2018	2018
4.200% Senior Notes, semi-annual interest payments, balloon due 2024
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			4.20%	4.20%
Debt instrument maturity year			2024	2024
5-year term loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires June 28, 2022
Debt Instrument [Line Items]
Line of credit facility, expiration period			5 years	5 years
Line of credit facility, expiration date			Jun. 28, 2022	Jun. 28, 2022
5-year term loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires June 28, 2022 \| LIBOR
Debt Instrument [Line Items]
Debt instrument, variable interest rate			1.75%	1.75%
5-year revolving loan facility, periodic interest payments, currently LIBOR plus up to 1.500%, plus commitment fees up to 0.250%, expires June 28, 2022
Debt Instrument [Line Items]
Line of credit facility, expiration period			5 years	5 years
Line of credit facility, commitment fee percentage			0.25%	0.25%
Line of credit facility, expiration date			Jun. 28, 2022	Jun. 28, 2022
5-year revolving loan facility, periodic interest payments, currently LIBOR plus up to 1.500%, plus commitment fees up to 0.250%, expires June 28, 2022 \| LIBOR
Debt Instrument [Line Items]
Debt instrument, variable interest rate			1.50%	1.50%
Maximum
Debt Instrument [Line Items]
Debt instrument, variable interest rate			1.75%
Master Agreement [Member] \| Series E [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment, Interest		$ 700,000
Payment for Debt Extinguishment or Debt Prepayment Cost	$ 700,000
Debt instrument, interest rate, stated percentage					4.50%

Long-Term Debt - Narrative (Detail)			3 Months Ended			12 Months Ended
Long-Term Debt - Narrative (Detail)	Dec. 21, 2018 USD ($)	May 20, 2014 USD ($) extension	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2019 USD ($)	Nov. 15, 2018 USD ($)	May 10, 2018 USD ($)	Jun. 28, 2017 USD ($)	Dec. 22, 2016 USD ($)	Jan. 15, 2015 USD ($)	Sep. 18, 2014 USD ($)	Apr. 17, 2014 USD ($)	Sep. 15, 2011 USD ($)	Feb. 01, 2008 USD ($)	Dec. 22, 2006 USD ($)
Debt Instrument [Line Items]
Proceeds from Issuance of Debt				$ 2,800,000
Write off of Deferred Debt Issuance Cost				200,000
Debt Issuance Costs, Noncurrent, Net												$ 1,600,000
Credit facility, outstanding amount			$ 965,000,000			$ 965,000,000	$ 365,000,000
Revolving and term loan						1,015,000,000.0
Potential increased in line of credit facility																$ 500,000,000.0
Unsecured revolving credit facility			350,000,000.0			350,000,000.0				$ 600,000,000.0		$ 400,000,000.0				800,000,000.0
Debt Instrument, Periodic Payment, Principal			5,000,000.0
Unsecured term loans			365,000,000.0			365,000,000.0										550,000,000.0
Long-term Debt, Maturities, Repayments of Principal in Year Two			55,000,000.0			55,000,000.0
Debt Instrument, Periodic Payment	$ 250,000,000.0
Proceeds from lines of credit						600,000,000	0	$ 0
Outstanding debt balance			1,506,990,000			1,506,990,000	$ 976,141,000
Senior Notes Due Two Thousand Sixteen [Member]
Debt Instrument [Line Items]
Current portion of senior notes														$ 25,000,000.0
5.370% senior notes, Series D, quarterly interest payments, balloon due 2015
Debt Instrument [Line Items]
Current portion of senior notes													$ 25,000,000.0
Credit Agreement
Debt Instrument [Line Items]
Number of extension periods \| extension		2
Extension period		1 year
Unsecured revolving credit facility																$ 1,350,000,000.0
Unsecured Senior Notes
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage															4.20%
Debt instrument, face amount															$ 500,000,000.0
Outstanding debt balance			500,000,000.0			500,000,000.0
Term Loan
Debt Instrument [Line Items]
Credit facility, outstanding amount		$ 550,000,000.0
Debt Instrument, Periodic Payment, Principal				67,500,000
Unsecured term loans			$ 300,000,000.0			$ 300,000,000.0
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility, outstanding amount		$ 375,000,000.0													$ 475,000,000.0
Master Agreement \| Series C
Debt Instrument [Line Items]
Unsecured senior notes outstanding																		$ 25,000,000.0	$ 25,000,000.0
Debt instrument interest rate stated percentage																			5.66%
Master Agreement \| Series D
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage																		5.37%
Master Agreement \| Series E
Debt Instrument [Line Items]
Unsecured senior notes outstanding											$ 100,000,000.0						$ 100,000,000.0
Debt Instrument, Periodic Payment, Interest					$ 700,000
Debt instrument interest rate stated percentage																	4.50%
Long-term Debt, Contingent Payment of Principal or Interest				$ 700,000
LIBOR \| Term Loan
Debt Instrument [Line Items]
30-day Adjusted LIBOR Rate			2.50%			2.50%
LIBOR \| Revolving Credit Facility
Debt Instrument [Line Items]
30-day Adjusted LIBOR Rate			2.563%			2.563%
LIBOR \| Long-term Debt [Member]
Debt Instrument [Line Items]
30-day Adjusted LIBOR Rate			2.288%			2.288%
Minimum
Debt Instrument [Line Items]
Debt instrument, variable interest rate						1.00%
Minimum \| Term Loan
Debt Instrument [Line Items]
Unsecured term loans	300,000,000.0
Minimum \| Revolving Credit Facility
Debt Instrument [Line Items]
Facility fee						0.15%
Minimum \| LIBOR \| Term Loan
Debt Instrument [Line Items]
Debt instrument, variable interest rate						1.00%
Minimum \| LIBOR \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, variable interest rate						0.85%
Maximum
Debt Instrument [Line Items]
Debt instrument, variable interest rate						1.75%
Maximum \| Term Loan
Debt Instrument [Line Items]
Unsecured term loans	$ 450,000,000.0
Maximum \| Revolving Credit Facility
Debt Instrument [Line Items]
Facility fee						0.25%
Maximum \| LIBOR \| Term Loan
Debt Instrument [Line Items]
Debt instrument, variable interest rate						1.75%
Maximum \| LIBOR \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, variable interest rate						1.50%
Scenario, Forecast [Member]
Debt Instrument [Line Items]
Unsecured senior notes outstanding									$ 5,000,000.0
Subsequent Event [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Year Two									$ 3,800,000

Long-Term Debt Details (Details) - USD ($) $ in Thousands	12 Months Ended
Long-Term Debt Details (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Disclosure [Abstract]
Interest	$ 38,032	$ 36,172	$ 37,652
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	50,000
Long-term Debt, Maturities, Repayments of Principal in Year Two	55,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	70,000
Long-term Debt, Maturities, Repayments of Principal in Year Four	630,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	210,000
Long-term Debt, Maturities, Repayments of Principal after Year Five	$ 500,000

Income Taxes (Details) - USD ($)	12 Months Ended
Income Taxes (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018	Dec. 31, 2014
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	$ 1,600,000
Operating Loss Carryforwards State	42,500,000
Operating Loss Carryforwards	100,000
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	(644,000)	$ (126,000)	$ (205,000)
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	(5,000)	0	(41,000)
Deferred Tax Assets, Valuation Allowance	(896,000)	(893,000)
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	594,000	1,070,000	412,000
Deferred income taxes, net	315,732,000	256,185,000		$ 300,760,000
Deferred Tax Assets, Operating Loss Carryforwards	2,196,000	2,434,000
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation	41,293,000	36,701,000
Liability for Uncertain Tax Positions, Current	197,205	228,608	86,191
Income Taxes Paid	$ 110,557,000	152,024,000	143,111,000
Document Period End Date	Dec. 31, 2018
Unrecognized Tax Benefits	$ 1,639,000	1,694,000	$ 750,000		$ 584,000
Deferred Tax Liabilities, Property, Plant and Equipment	4,929,000	2,723,000
deferred profit sharing contingent commissions	$ 0	$ 7,107,000
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	21.00%	35.00%	35.00%
Current Federal Tax Expense (Benefit)	$ 77,694,000	$ 129,954,000	$ 126,145,000
Current State and Local Tax Expense (Benefit)	25,096,000	21,392,000	21,110,000
Current Foreign Tax Expense (Benefit)	409,000	929,000	590,000
Deferred Federal Income Tax Expense (Benefit)	8,483,000	18,999,000	15,551,000
Current Income Tax Expense (Benefit)	103,199,000	152,275,000	147,845,000
Deferred State and Local Income Tax Expense (Benefit)	6,519,000	2,984,000	2,612,000
Deferred Foreign Income Tax Expense (Benefit)	6,000	0	0
Summary of Income Tax Contingencies [Table Text Block]	15,008,000	(102,183,000)	18,163,000
Income Tax Expense (Benefit)	$ (118,207,000)	$ (50,092,000)	$ (166,008,000)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	5.70%	3.80%	3.90%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent	0.20%	0.30%	0.30%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Percent	0.30%	0.30%	0.30%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount	$ 0.003	$ 0
Tax Reform Act Deferred Tax Revaluation and Transition Tax Impact	(0.30%)	(26.90%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent	(1.60%)	(1.40%)	(0.30%)
Effective Income Tax Rate Reconciliation, Percent	25.60%	11.10%	39.20%
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals	$ 10,455,000	$ 7,534,000
Net Unrealized Holding Gain on Available for Sale Securities	(78,000)	(6,000)
Deferred Tax Liabilities, Goodwill and Intangible Assets	334,200,000	306,351,000
Non Current Deferred Tax Liability	368,780,000	309,068,000
Deferred Tax Assets, Net, Noncurrent	$ 53,048,000	52,883,000
Tax Cuts and Jobs Act 2017 [Member]
Income Tax Contingency [Line Items]
Taxes Payable		3,300,000
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	21.00%
Income Tax Expense (Benefit)		120,900,000
Deferred Tax Liabilities, Deferred Expense	$ 0	$ (124,166,000)
Accounting Standards Update 2014-09 [Member]
Income Tax Contingency [Line Items]
Deferred Tax Liabilities, Other	$ 29,729,000

Income Taxes Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%	35.00%
Income Tax Expense (Benefit)	$ (118,207)	$ (50,092)	$ (166,008)
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	$ 1,600
Tax Cuts and Jobs Act 2017 [Member]
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Income Tax Expense (Benefit)		120,900
Taxes Payable		3,300
Deferred Tax Liabilities, Deferred Expense	$ 0	$ 124,166
Accounting Standards Update 2014-09 [Member]
Income Tax Contingency [Line Items]
Deferred Tax Liabilities, Other	$ 29,729

Employee Savings Plan (Details) - USD ($)	12 Months Ended
Employee Savings Plan (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Employee Savings Plan [Abstract]
Compensation and Employee Benefit Plans [Text Block]	NOTE 11· Employee Savings PlanThe Company has an Employee Savings Plan (401(k)) in which substantially all employees with more than 30 days of service are eligible to participate. Under this plan, the Company makes matching contributions of up to 4.0% of each participant’s annual compensation. Prior to 2014, the Company’s matching contribution was up to 2.5% of each participant’s annual compensation with an additional discretionary profit-sharing contribution each year, which equaled 1.5% of each eligible employee’s compensation. The Company’s contribution expense to the plan totaled $22.8 million in 2018, $19.6 million in 2017 and $19.3 million in 2016.
Service Period Eligible to Participate for Employee Savings Plan	$ 30
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	4.00%		2.50%
Discretionary Profit Sharing Contribution Percentage of Employees Salary	1.50%
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 22,800,000	$ 19,600,000	$ 19,300,000

Stock Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Jul. 31, 2009	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Apr. 28, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
MaximumNumberOfSharesAvailableToBeGrantedUnderAwardStockPlan				28,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				10,269,384
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value				$ 11.9	$ 6.3	$ 18.1
IncrementalIncreasesInAverageStockPriceFromInitialGrantPrice				20.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period	20 years			15 years
AttainmentAgeOfStockPlan				attainment of age 64
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedSharesOutstandingNumber				1,196,092
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsDistributedSharesOutstandingNumber				9,073,292
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit				$ 8.16
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit				$ 12.84
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease)		2,600,000	2,400,000
PerformanceStockPlan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodAwardedShares				453,860	277,602	1,012,844
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period				(44,524)	(34,472)	(185,034)
ShareBasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedInPeriod				0	0	8,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				0	0	0
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodPriorYearAwardsIssuedGrantedInCurrentYear				0	0	0
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsNotYetAwardedInPeriod				0	0	0
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedInPeriodWeightedAverageGrantDateFairValue				0	0	0
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNotYetAwardedInPeriod				0	0	(8,000)
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue				5.03	5.16	5.11	4.52
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value				$ 5.53	$ 4.81	$ 3.19
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period				(453,860)	(277,602)	(1,012,844)
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodAwardedShares				(44,524)	(34,472)	(177,034)
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodNotYetAwardedShares				0	0	(8,000)
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodSharesNotAwarded				0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value				$ 4.92	$ 5.24	$ 5.26
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedSharesOutstandingNumber				1,196,092	1,694,476	2,006,550	3,204,428
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesNotYetAwardedOutstandingNumber				0	0	0	16,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value				$ 0	$ 0	$ 0
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedSharesOutstandingNumber				1,196,092	1,694,476	2,006,550	3,188,428
Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodAwardedShares				(933,916)	484,914	333,768
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period				(2,363,420)	(342,120)	(1,908,262)
ShareBasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedInPeriod				2,489,905	326,808	2,862,638
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				1,577,721	1,392,912	1,944,198
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodPriorYearAwardsIssuedGrantedInCurrentYear				454,313	241,334	365,306
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedInPeriodWeightedAverageGrantDateFairValue				15.89	15.72	12.46
ShareBasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsGrantedSharesAwardedInPeriod				0	0	0
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNotYetAwardedInPeriod				(2,489,905)	(326,808)	(2,862,638)
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue				16.69	15.58	14.98		14.37
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant				8,697,491
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value				$ 14.09	$ 12.61	$ 13.66
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period				(933,916)	(484,914)	333,768
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodAwardedShares				(224,587)	(76,212)	(351,576)
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodNotYetAwardedShares				(2,138,833)	(265,908)	(1,556,686)
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodSharesNotAwarded				0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value				$ 16.37	$ 14.89	$ 12.67
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedSharesOutstandingNumber				11,102,375	12,821,990	12,256,112		12,553,944
SharesAvailableForIssuanceUnderStockIncentivePlan									12,093,536
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesNotYetAwardedOutstandingNumber				4,507,056	8,012,386	7,453,524		10,293,956
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value				$ 22.87	$ 20.82	$ 17.76
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedSharesOutstandingNumber				6,595,319	4,809,604	4,802,588		2,259,988
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized				34,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant				7,316,901
Perfomance Based [Member] \| Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsNotYetAwardedInPeriod				1,123,408	1,151,578	1,578,892

Stock Based Compensation Summary of PSP Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedSharesOutstandingNumber	1,196,092
Stock Incentive Plan [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue	16.69	15.58	14.98	14.37
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedSharesOutstandingNumber	11,102,375	12,821,990	12,256,112	12,553,944
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedSharesOutstandingNumber	6,595,319	4,809,604	4,802,588	2,259,988
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesNotYetAwardedOutstandingNumber	4,507,056	8,012,386	7,453,524	10,293,956
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 22.87	$ 20.82	$ 17.76
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	1,577,721	1,392,912	1,944,198
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodPriorYearAwardsIssuedGrantedInCurrentYear	454,313	241,334	365,306
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedInPeriodWeightedAverageGrantDateFairValue	15.89	15.72	12.46
ShareBasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsGrantedSharesAwardedInPeriod	0	0	0
ShareBasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedInPeriod	2,489,905	326,808	2,862,638
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNotYetAwardedInPeriod	(2,489,905)	(326,808)	(2,862,638)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 14.09	$ 12.61	$ 13.66
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	933,916	484,914	(333,768)
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodAwardedShares	933,916	(484,914)	(333,768)
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodSharesNotAwarded	0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 16.37	$ 14.89	$ 12.67
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(2,363,420)	(342,120)	(1,908,262)
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodAwardedShares	(224,587)	(76,212)	(351,576)
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodNotYetAwardedShares	(2,138,833)	(265,908)	(1,556,686)
Perfomance Based [Member] \| Stock Incentive Plan [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsNotYetAwardedInPeriod	1,123,408	1,151,578	1,578,892

Stock Based Compensation Stock Incentive Plan (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	10,269,384
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedSharesOutstandingNumber	1,196,092
PerformanceStockPlan [Member]
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue	5.03	5.16	5.11	4.52
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 0	$ 0	$ 0
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedInPeriodWeightedAverageGrantDateFairValue	0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 5.53	$ 4.81	$ 3.19
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 4.92	$ 5.24	$ 5.26
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedSharesOutstandingNumber	1,196,092	1,694,476	2,006,550	3,204,428
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0	0	0
ShareBasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedInPeriod	0	0	8,000
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNotYetAwardedInPeriod	0	0	(8,000)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	453,860	277,602	1,012,844
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(44,524)	(34,472)	(185,034)
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedSharesOutstandingNumber	1,196,092	1,694,476	2,006,550	3,188,428
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodPriorYearAwardsIssuedGrantedInCurrentYear	0	0	0
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodAwardedShares	(453,860)	(277,602)	(1,012,844)
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodAwardedShares	(44,524)	(34,472)	(177,034)
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesNotYetAwardedOutstandingNumber	0	0	0	16,000
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsNotYetAwardedInPeriod	0	0	0
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodSharesNotAwarded	0	0	0
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodNotYetAwardedShares	0	0	(8,000)
Stock Incentive Plan [Member]
Stock Issued During Period, Shares, Share-based Compensation, Gross	26,620	22,700	33,720
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue	16.69	15.58	14.98		14.37
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 22.87	$ 20.82	$ 17.76
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedInPeriodWeightedAverageGrantDateFairValue	15.89	15.72	12.46
ShareBasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsGrantedSharesAwardedInPeriod	0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 14.09	$ 12.61	$ 13.66
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 16.37	$ 14.89	$ 12.67
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedSharesOutstandingNumber	11,102,375	12,821,990	12,256,112		12,553,944
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	1,577,721	1,392,912	1,944,198
ShareBasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedInPeriod	2,489,905	326,808	2,862,638
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNotYetAwardedInPeriod	(2,489,905)	(326,808)	(2,862,638)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	933,916	484,914	(333,768)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(2,363,420)	(342,120)	(1,908,262)
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedSharesOutstandingNumber	6,595,319	4,809,604	4,802,588		2,259,988
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodPriorYearAwardsIssuedGrantedInCurrentYear	454,313	241,334	365,306
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodAwardedShares	933,916	(484,914)	(333,768)
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodAwardedShares	(224,587)	(76,212)	(351,576)
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesNotYetAwardedOutstandingNumber	4,507,056	8,012,386	7,453,524		10,293,956
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodSharesNotAwarded	0	0	0
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodNotYetAwardedShares	(2,138,833)	(265,908)	(1,556,686)
Perfomance Based [Member] \| Stock Incentive Plan [Member]
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsNotYetAwardedInPeriod	1,123,408	1,151,578	1,578,892

Stock Based Compensation Non Cash Stock Based Compensation Expense (Details) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

The non-cash stock-based compensation expense for the years ended December 31 is as follows:



(in thousands)	2018		2017		2016
Stock incentive plan	$	28,027	$	24,899	$	11,049
Employee stock purchase plan	4,744		4,025		3,698
Performance stock plan	748		1,707		1,305
Total	$	33,519	$	30,631	$	16,052

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based Compensation

$ 33,519

$ 30,631

$ 16,052

Stock Incentive Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based Compensation

28,027

24,899

11,049

PerformanceStockPlan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based Compensation

748

1,707

1,305

Employee Stock [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based Compensation

$ 4,744

$ 4,025

$ 3,698

Stock Based Compensation Summary of Stock Options (Details) - Stock Incentive Plan [Member] - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNotYetAwardedInPeriod	(2,489,905)	(326,808)	(2,862,638)
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodPriorYearAwardsIssuedGrantedInCurrentYear	454,313	241,334	365,306
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	1,577,721	1,392,912	1,944,198

Stock Based Compensation Employee Stock Purchase Plan Details (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) shares	Aug. 31, 2018 $ / shares	Jul. 31, 2018 shares	Dec. 31, 2017 USD ($) shares	Aug. 31, 2017 $ / shares	Jul. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) shares	Aug. 31, 2016 $ / shares	Jul. 31, 2016 USD ($) $ / shares shares	Jul. 31, 2015 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate	10.00%
Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	8,697,491
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	7,316,901
ThresholdPeriodWorkedPerWeekByEmployees	20
AllottedValueMaximum \| $	$ 25,000
ShareBasedCompensationArrangementByShareBasedPaymentAwardSubscriptionPeriodBeginning	--08-01
ShareBasedCompensationArrangementByShareBasedPaymentAwardSubscriptionPeriodEnding	--07-31
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent	85.00%
ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentOfMarketPrice	15.00%
ValueOfOneYearStockOptionPercentage	85.00%
EstimatedFairValuePerShareOption \| $ / shares		$ 5.88			$ 4.32			$ 3.81
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period			985,601			1,058,024			1,029,330
ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedAggregatePurchaseValue \| $						$ 18,700,000			$ 16,400,000	$ 15,000,000.0
ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedAggregatePurchasePricePerShare \| $ / shares						$ 18.96			$ 15.52	$ 14.62
Shares held in Employee Stock Option Plan, Suspense Shares	402,349			435,027			494,046
CashReceivedFromProceedsByParticipants \| $	$ 9,900,000			$ 8,200,000			$ 7,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	34,000,000

Stock Based Compensation Unrecognized Compensation Costs (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 97.1
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	3 years 3 months 14 days

Stock Based Compensation Details (Details) - shares	3 Months Ended		12 Months Ended
Stock Based Compensation Details (Details) - shares	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Apr. 28, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
MaximumNumberOfSharesAvailableToBeGrantedUnderAwardStockPlan			28,800,000
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease)	2,600,000	2,400,000
Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
SharesAvailableForIssuanceUnderStockIncentivePlan						12,093,536
Time-Based [Member] \| Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period			454,313	241,334	365,306
Perfomance Based [Member] \| Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsNotYetAwardedInPeriod			1,123,408	1,151,578	1,578,892
Performance Shares [Member] \| Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period			2,489,905	326,808	2,870,638

Stock Based Compensation Schedule of compensation cost for share-based payment arrangements, allocation of share-based compensation costs by plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation	$ 33,519	$ 30,631	$ 16,052
Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation	28,027	24,899	11,049
PerformanceStockPlan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation	$ 748	$ 1,707	$ 1,305

Stock Based Compensation Schedule of Share Based Compensation, Stock Options Activity (Details) - $ / shares	3 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Apr. 28, 2010
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			10,269,384
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedSharesOutstandingNumber			1,196,092
Stock Incentive Plan [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Common Stock Issued to Directors Shares			26,620	22,700	33,720
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNotYetAwardedInPeriod			(2,489,905)	(326,808)	(2,862,638)
SharesAvailableForIssuanceUnderStockIncentivePlan								12,093,536
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedSharesOutstandingNumber			11,102,375	12,821,990	12,256,112		12,553,944
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 22.87	$ 20.82	$ 17.76
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedSharesOutstandingNumber			6,595,319	4,809,604	4,802,588		2,259,988
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesNotYetAwardedOutstandingNumber			4,507,056	8,012,386	7,453,524		10,293,956
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			1,577,721	1,392,912	1,944,198
PerformanceStockPlan [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNotYetAwardedInPeriod			0	0	(8,000)
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedSharesOutstandingNumber			1,196,092	1,694,476	2,006,550	3,204,428
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 0	$ 0	$ 0
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedSharesOutstandingNumber			1,196,092	1,694,476	2,006,550	3,188,428
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesNotYetAwardedOutstandingNumber			0	0	0	16,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			0	0	0
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsNotYetAwardedInPeriod			0	0	0
Maximum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease)	2,600,000	2,400,000
Perfomance Based [Member] \| Stock Incentive Plan [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsNotYetAwardedInPeriod			1,123,408	1,151,578	1,578,892

Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities - Significant Non-Cash Investing and Financing Activities (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted Cash and Cash Equivalents	$ 338,635,000	$ 250,705,000	$ 265,637,000
Cash and Cash Equivalents, at Carrying Value	438,961,000	573,383,000	515,646,000
Cash paid during the period for:
Interest	38,032,000	36,172,000	37,652,000
Income taxes	110,557,000	152,024,000	143,111,000
Significant non-cash investing and financing activities
Other payables issued for purchased customer accounts	5,462,000	11,708,000	10,664,000
Estimated acquisition earn-out payables and related charges	77,378,000	6,921,000	4,463,000
Notes Assumed	0	0	492,000
Notes received on the sale of fixed assets and customer accounts	52,000	0	22,000
Cash and Cash Equivalents inclusive of Restricted Cash [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 777,596,000	$ 824,088,000	$ 781,283,000

Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities Restricted Cash (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash and Cash Equivalents, at Carrying Value	$ 438,961,000	$ 573,383,000	$ 515,646,000
Restricted Cash and Cash Equivalents	338,635,000	250,705,000	265,637,000
Cash and Cash Equivalents inclusive of Restricted Cash [Member]
Cash and Cash Equivalents, at Carrying Value	$ 777,596,000	$ 824,088,000	$ 781,283,000

Commitments and Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Operating Leases, Rent Expense	$ 54.6	$ 51.0	$ 49.3
Operating Leases, Future Minimum Payments Due	$ 210.0	$ 210.4	$ 213.2

Quarterly Operating Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 508,748	$ 530,850	$ 473,187	$ 501,461	$ 474,316	$ 475,646	$ 466,305	$ 465,080	$ 2,014,246	$ 1,881,347	$ 1,766,629
Operating Expenses	408,137	388,350	372,277	383,020	367,982	351,227	358,303	354,113	1,551,784	1,431,625	1,343,130
Income before income taxes	100,611	142,500	100,910	118,441	106,334	124,419	108,002	110,967	462,462	449,722	423,499
Net Income (Loss) Attributable to Parent	$ 73,452	$ 106,053	$ 73,922	$ 90,828	$ 187,505	$ 75,913	$ 66,102	$ 70,110	$ 344,255	$ 399,630	$ 257,491
Earnings Per Share, Basic	$ 0.0026	$ 0.0038	$ 0.0027	$ 0.0033	$ 0.0068	$ 0.0027	$ 0.0024	$ 0.0025	$ 1.24	$ 1.43	$ 0.92
Diluted (in dollars per share)	$ 0.0026	$ 0.0038	$ 0.0026	$ 0.0032	$ 0.0066	$ 0.0027	$ 0.0023	$ 0.0025	$ 1.22	$ 1.40	$ 0.91

Segment Information - Additional Information (Detail) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) Segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| Segment									4
Total revenues	$ 508,748	$ 530,850	$ 473,187	$ 501,461	$ 474,316	$ 475,646	$ 466,305	$ 465,080	$ 2,014,246	$ 1,881,347	$ 1,766,629
London, Bermuda and Cayman Islands
Segment Reporting Information [Line Items]
Total revenues									$ 15,200	$ 15,900	$ 14,500

Segment Information - Summarized Financial Information Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total revenues	$ 508,748	$ 530,850	$ 473,187	$ 501,461	$ 474,316	$ 475,646	$ 466,305	$ 465,080	$ 2,014,246	$ 1,881,347	$ 1,766,629
Investment income									2,746	1,626	1,456
Amortization									86,544	85,446	86,663
Depreciation									22,834	22,698	21,003
Interest expense									40,580	38,316	39,481
Income before income taxes	100,611	$ 142,500	$ 100,910	$ 118,441	106,334	$ 124,419	$ 108,002	$ 110,967	462,462	449,722	423,499
Total assets	6,688,668				5,747,550				6,688,668	5,747,550	5,262,734
Capital expenditures									41,520	24,192	17,765
Operating Segments \| Retail
Segment Reporting Information [Line Items]
Total revenues									1,042,763	943,460	917,406
Investment income									2	8	37
Amortization									44,386	42,164	43,447
Depreciation									5,289	5,210	6,191
Interest expense									35,969	31,133	38,216
Income before income taxes									217,845	196,616	188,001
Total assets	5,850,045				4,255,515				5,850,045	4,255,515	3,854,393
Capital expenditures									6,858	4,494	5,951
Operating Segments \| National Programs
Segment Reporting Information [Line Items]
Total revenues									494,463	479,813	448,516
Investment income									506	384	628
Amortization									25,954	27,277	27,920
Depreciation									5,486	6,325	7,868
Interest expense									26,181	35,561	45,738
Income before income taxes									117,375	109,961	91,762
Total assets	2,940,097				3,267,486				2,940,097	3,267,486	2,711,378
Capital expenditures									12,391	5,936	6,977
Operating Segments \| Wholesale Brokerage
Segment Reporting Information [Line Items]
Total revenues									287,014	271,737	243,103
Investment income									165	0	4
Amortization									11,391	11,456	10,801
Depreciation									1,628	1,885	1,975
Interest expense									5,254	6,263	3,976
Income before income taxes									70,171	68,844	62,623
Total assets	1,283,877				1,260,239				1,283,877	1,260,239	1,108,829
Capital expenditures									2,518	1,836	1,301
Operating Segments \| Services
Segment Reporting Information [Line Items]
Total revenues									189,246	165,372	156,365
Investment income									205	299	283
Amortization									4,813	4,548	4,485
Depreciation									1,558	1,600	1,881
Interest expense									2,869	3,522	4,950
Income before income taxes									34,508	30,498	24,338
Total assets	471,572				399,240				471,572	399,240	371,645
Capital expenditures									1,525	1,033	656
Other
Segment Reporting Information [Line Items]
Total revenues									760	20,965	1,239
Investment income									1,868	935	504
Amortization									0	1	10
Depreciation									8,873	7,678	3,088
Interest expense									(29,693)	(38,163)	(53,399)
Income before income taxes									22,563	43,803	56,775
Total assets	$ (3,856,923)				$ (3,434,930)				(3,856,923)	(3,434,930)	(2,783,511)
Capital expenditures									$ 18,228	$ 10,893	$ 2,880

Losses and Loss Adjustment Reserve - Effects of Reinsurance on Premiums Written and Earned (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Written
Direct premiums	$ 619,223	$ 604,623
Assumed premiums	0	0
Ceded premiums	619,206	604,610
Net premiums	17	13
Earned
Direct premiums	602,320	592,267
Assumed premiums	0	0
Ceded premiums	602,303	592,254
Net premiums	$ 17	$ 13

Losses and Loss Adjustment Reserve - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018 USD ($) Reinsurer	Dec. 31, 2017 USD ($)	Sep. 30, 2018
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Ceded rate of premiums under insurance program	100.00%
Document Period End Date	Dec. 31, 2018
Premiums written net	$ 619,206,000	$ 604,610,000
Reinsurance Recoverables on Unpaid Losses, Gross	65,400,000	477,800,000
Prepaid reinsurance premiums	337,920,000	321,017,000
Increase (Decrease) in Loss and Loss Adjustment Expense Reserve	200,000	1,100,000
Reserve For Losses And Loss Adjustment Expenses For Reinsurance Liability	$ 65,400,000	477,800,000
Number of reinsurers \| Reinsurer	2
Wright National Flood Insurance Company [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Ceded rate of premiums under insurance program	100.00%
Percentage of reinsurance recoverables allowance	30.00%		30.90%
Premiums written net	$ 617,200,000	602,900,000
Operating Expenses	$ 2,300,000
Wright National Flood Insurance Company [Member] \| Quota Share Agreement
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Effective cedes rate under quota share agreement	100.00%
Commission rate, percent of ceded written premiums	30.50%
Wright National Flood Insurance Company [Member] \| Quota Share Agreement \| Reinsurer Concentration Risk [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Ceded amount	$ 2,000,000.0	$ 1,700,000
Wright National Flood Insurance Company [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Loss Adjustment Expense	99,349
Case Reserves	0
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount	$ 100,000

Statutory Financial Information - Additional Information (Detail) - Wright Flood - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statutory Accounting Practices [Line Items]
Statutory capital and surplus required	$ 7,500,000
Statutory capital and surplus	19,400,000	$ 28,700,000
Statutory net Income	$ 4,500,000	$ 4,800,000

Subsidiary Dividend Restrictions - Additional Information (Detail) - Wright Flood - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019
Dividend Restrictions [Line Items]
Dividend rate as a percentage of net income	100.00%
Statutory Dividend Payment Restrictions Disclosure	Under the insurance regulations of Texas, where WNFIC in incorporated, the maximum amount of ordinary dividends that WNFIC can pay to shareholders in a rolling twelve month period is limited to the greater of 10% of statutory adjusted capital and surplus as shown on WNFIC’s last annual statement on file with the superintendent of the Texas Department of Insurance or 100% of adjusted net income
Scenario, Forecast
Dividend Restrictions [Line Items]
Maximum dividend payout that may be made without prior approval		$ 4.5
Maximum
Dividend Restrictions [Line Items]
Dividend rate as a percentage of net income	10.00%

Shareholders' Equity - Additional Information (Detail) - USD ($)		12 Months Ended				48 Months Ended
	Dec. 12, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2017	Dec. 31, 2018	Mar. 28, 2018	Mar. 14, 2018	Jul. 20, 2015	Jul. 21, 2014
Accelerated Share Repurchases [Line Items]
Common Stock, Shares Authorized		560,000,000				560,000,000	560,000,000
Common Stock, Par or Stated Value Per Share		$ 0.10				$ 0.10	$ 0.10	$ 0.10
Stock Repurchase Program, Authorized Amount							$ 100,000,000.0
Common Stock, Shares, Outstanding		276,210,910				276,210,910	279,583,006
Treasury stock shares (in shares)		10,718,319				10,718,319	13,796,696
Fair value of common stock repurchased		$ 386,322,000				$ 386,322,000	$ 477,572,000
Accelerated Share Repurchases, Settlement (Payment) or Receipt							20,000,000.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount							147,500,000
Treasury Stock, Shares, Acquired						13,800,000
Accelerated Share Repurchase Agreement [Member]
Accelerated Share Repurchases [Line Items]
Treasury stock shares (in shares)		2,883,349	209,618	5,408,819	2,384,760	2,883,349
Treasury Stock Acquired, Average Cost Per Share		$ 48.51	$ 36.53	$ 32.35	$ 31.46
Fair value of common stock repurchased		$ 139,900,000	$ 7,700,000	$ 175,000,000.0	$ 75,000,000.0	$ 139,900,000	80,000,000.0
Treasury Stock, Shares, Acquired	2,910,150
Maximum [Member]
Accelerated Share Repurchases [Line Items]
Stock Repurchase Program, Authorized Amount							$ 100,000,000.0			$ 400,000,000.0	$ 200,000,000.0
2 for 1 Stock Split [Member]
Accelerated Share Repurchases [Line Items]
Common Stock, Shares Authorized								560,000,000	280,000,000
Common Stock, Shares, Outstanding								276,000,000	138,000,000

Shareholders' Equity Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended					48 Months Ended
	Dec. 12, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2017
Treasury Stock, Value, Acquired, Cost Method		$ 100,000	$ 139,889	$ 7,658			$ 477,500
Stock Repurchase Program, Authorized Amount		100,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 147,500
Treasury Stock, Shares, Acquired							13,800,000
Treasury Stock, Shares		13,796,696	10,718,319				10,718,319
Treasury Stock, Value		$ 477,572	$ 386,322				$ 386,322
Accelerated Share Repurchases, Settlement (Payment) or Receipt		20,000
Accelerated Share Repurchase Agreement [Member]
Treasury Stock, Shares, Acquired	2,910,150
Treasury Stock, Shares			2,883,349	209,618	5,408,819	2,384,760	2,883,349
Treasury Stock Acquired, Average Cost Per Share			$ 48.51	$ 36.53	$ 32.35	$ 31.46
Treasury Stock, Value		$ 80,000	$ 139,900	$ 7,700	$ 175,000	$ 75,000	$ 139,900

Statutory Financial Information	12 Months Ended
Statutory Financial Information	Dec. 31, 2018
Statutory Accounting Practices [Abstract]
Statutory Financial Information	Statutory Financial InformationWNFIC maintains capital in excess of minimum statutory amount of $7.5 million as required by regulatory authorities. The statutory capital and surplus of WNFIC was $19.4 million as of December 31, 2018 and $28.7 million as of December 31, 2017. As of December 31, 2018 and 2017, WNFIC generated statutory net income of $4.5 million and $4.8 million, respectively.

Subsidiary Dividend Restrictions	12 Months Ended
Subsidiary Dividend Restrictions	Dec. 31, 2018
Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract]
Subsidiary Dividend Restrictions	Subsidiary Dividend RestrictionsUnder the insurance regulations of Texas, where WNFIC in incorporated, the maximum amount of ordinary dividends that WNFIC can pay to shareholders in a rolling twelve month period is limited to the greater of 10% of statutory adjusted capital and surplus as shown on WNFIC’s last annual statement on file with the superintendent of the Texas Department of Insurance or 100% of adjusted net income. There was no dividend payout in 2018 and the maximum dividend payout that may be made in 2019 without prior approval is $4.5 million.

Summary of Significant Accounting Policies Fair Value of Financial Instruments (Details) $ in Millions	Dec. 31, 2018 USD ($)
Text Block [Abstract]
Long-term Debt, Fair Value	$ 499.1

Summary of Significant Accounting Policies Amortizable Intangible Assets (Details)	12 Months Ended
	Dec. 31, 2018
Minimum
Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years
Maximum
Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years

Nature of Operations - Additional Information (Detail)	12 Months Ended
Nature of Operations - Additional Information (Detail)	Dec. 31, 2018 Segment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of reportable segments	4