Document and Entity Information	3 Months Ended
Document and Entity Information	Mar. 31, 2017 shares
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1
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	140,269,131

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
REVENUES
Commissions and fees	$ 444,566	$ 422,335
Investment income	243	418
Other income, net	20,271	1,420
Total revenues	465,080	424,173
EXPENSES
Employee compensation and benefits	245,866	224,059
Other operating expenses	66,919	63,605
Gain on disposal	(100)	(2,044)
Amortization	21,620	21,610
Depreciation	6,098	5,318
Interest	9,682	9,897
Change in estimated acquisition earn-out payables	4,028	(821)
Total expenses	354,113	321,624
Income before income taxes	110,967	102,549
Income taxes	40,857	40,479
Net income	$ 70,110	$ 62,070
Net income per share:
Basic (in dollars per share)	$ 0.50	$ 0.45
Diluted (in dollars per share)	0.49	0.44
Dividends declared per share (in dollars per share)	$ 0.1350	$ 0.1225

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 546,721	$ 515,646
Restricted cash and investments	279,368	265,637
Short-term investments	20,622	15,048
Premiums, commissions and fees receivable	486,291	502,482
Reinsurance recoverable	39,239	78,083
Prepaid reinsurance premiums	280,140	308,661
Other current assets	44,584	50,571
Total current assets	1,696,965	1,736,128
Fixed assets, net	72,607	75,807
Goodwill	2,675,831	2,675,402
Amortizable intangible assets, net	685,519	707,454
Investments	17,153	23,048
Other assets	49,369	44,895
Total assets	5,197,444	5,262,734
Current Liabilities:
Premiums payable to insurance companies	643,181	647,564
Losses and loss adjustment reserve	39,239	78,083
Unearned premiums	280,140	308,661
Premium deposits and credits due customers	90,853	83,765
Accounts payable	104,819	69,595
Accrued expenses and other liabilities	124,676	201,989
Current portion of long-term debt	55,000	55,500
Total current liabilities	1,337,908	1,445,157
Long-term debt, less unamortized discount and debt issuance costs	1,005,044	1,018,372
Deferred income taxes, net	368,323	357,686
Other liabilities	70,373	81,308
Shareholders’ Equity:
Common stock, par value $0.10 per share; authorized 280,000 shares; issued 148,277 shares and outstanding 140,274 shares at 2017, issued 148,107 shares and outstanding 140,104 shares at 2016	14,828	14,811
Additional paid-in capital	472,749	468,443
Treasury stock, at cost 8,003 shares at 2017 and 2016, respectively	(257,683)	(257,683)
Retained earnings	2,185,902	2,134,640
Total shareholders’ equity	2,415,796	2,360,211
Total liabilities and shareholders’ equity	$ 5,197,444	$ 5,262,734

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Common stock, par value (in dollars per share)	$ 0.10		$ 0.10
Common stock, shares authorized (in shares)	280,000,000		280,000,000
Common stock, shares issued (in shares)	148,277,000		148,107,000
Common stock, shares outstanding (in shares)	140,274,000		140,104,000
Treasury stock shares (in shares)	8,003,000		8,003,000
Tax effect of accumulated other comprehensive income	$ 0	$ 0

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Condensed Cash Flow Statements, Captions [Line Items]
Cash, Cash Equivalents and Restricted Cash	$ 826,089	$ 632,921
Cash flows from operating activities:
Net income	70,110	62,070
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization	21,620	21,610
Depreciation	6,098	5,318
Non-cash stock-based compensation	8,564	2,772
Change in estimated acquisition earn-out payables	4,028	(821)
Deferred income taxes	10,005	9,933
Amortization of debt discount	39	39
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Amortization Expense	383	420
Accretion (Amortization) of Discounts and Premiums, Investments	8	18
Income tax benefit from exercise of shares from the stock benefit plans	0	(1,249)
Payments On Acquisition Earn Outs In Excess Of Original Estimated Payables	(4,547)	(3,550)
Net gain on sales of investments, fixed assets and customer accounts	(2)	(1,911)
Changes in operating assets and liabilities, net of effect from acquisitions and divestitures:
Premiums, commissions and fees receivable decrease	16,297	5,229
Reinsurance recoverables decrease (increase)	38,844	(26,161)
Prepaid reinsurance premiums decrease	28,521	29,859
Other assets decrease (increase)	1,404	(21,247)
Premiums payable to insurance companies (decrease)	(4,383)	(21,139)
Premium deposits and credits due customers increase	7,088	6,238
Losses and loss adjustment reserve (decrease) increase	(38,844)	26,161
Unearned premiums (decrease)	(28,521)	(29,859)
Accounts payable increase	45,386	22,962
Accrued expenses and other liabilities (decrease)	(77,325)	(50,034)
Other liabilities (decrease)	(14,752)	(3,436)
Net cash provided by operating activities	90,021	33,222
Cash flows from investing activities:
Additions to fixed assets	(3,032)	(4,252)
Payments for businesses acquired, net of cash acquired	0	(40,603)
Proceeds from sales of fixed assets and customer accounts	589	2,467
Purchases of investments	(379)	(10,106)
Proceeds from Sale, Maturity and Collection of Investments	679	7,604
Net cash used in investing activities	(2,143)	(44,890)
Cash flows from financing activities:
Payments on acquisition earn-outs	(5,683)	(5,527)
Proceeds from long-term debt	(14,250)	(6,875)
Income tax benefit from exercise of shares from the stock benefit plans	0	1,249
Issuances of common stock for employee stock benefit plans	506	916
Repurchase Of Stock Benefit Plan Shares For Employees To Fund Tax Withholdings	(4,742)	(1,385)
Purchase of treasury stock	0	(11,250)
Settlement of accelerated share repurchase program	0	11,250
Cash dividends paid	(18,903)	(16,962)
Net cash used in financing activities	(43,072)	(28,584)
Net increase (decrease) in cash and cash equivalents inclusive of restricted cash	44,806	(40,252)
Cash, Cash Equivalents and Restricted Cash- Beginning Balance			$ 781,283	$ 673,173
Cash and cash equivalents inclusive of restricted cash at beginning of period	546,721	401,846	515,646	443,420
Cash and Cash Equivalents inclusive of Restricted Cash [Member]
Cash flows from financing activities:
Cash and cash equivalents inclusive of restricted cash at beginning of period	$ 826,089	$ 632,921	$ 781,283	$ 673,173

Nature of Operations	3 Months Ended
Nature of Operations	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	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 nationwide networks of independent agents, including Brown & Brown retail agents; the Wholesale Brokerage Segment markets and sells excess and surplus commercial insurance, primarily through 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.

Basis of Financial Reporting	3 Months Ended
Basis of Financial Reporting	Mar. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Basis of Financial Reporting	Basis of Financial Reporting The accompanying unaudited Condensed Consolidated Financial Statements have been prepared in accordance with U.S. GAAP for interim financial information and with the instructions for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. These unaudited Condensed Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and the Notes thereto set forth in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016. The preparation of these financial statements in conformity with 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. Recently Issued Accounting Pronouncements 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 has elected to early adopt for the reporting period ended March 31, 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 three months ended March 31, 2016 were previously reported as $31.9 million. With the retrospective adoption, the net cash provided by operating activities for the three months ended March 31, 2016 is now reported as $33.2 million. The Company reflects cash collected from customers that is payable to insurance companies as Restricted cash if required by the state of domicile for the office conducting this transaction or if required by contract with relevant insurance company providing coverage. 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 will take effect for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017 and early adoption is permitted. The Company has evaluated the impact of ASU 2016-15 and has determined there is no impact on the Company's Statement of Cash Flows. The Company already presents 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 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 as a component of equity on the Balance Sheet. Also 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. ASU 2016-08 is effective contemporaneous with ASU 2014-09 beginning January 1, 2018. The impact of ASU 2016-08 is currently being evaluated along with ASU 2014-09. At this point in our evaluation the potential impact would primarily be limited to the claims administering activities within our Services Segment and therefore not material to the Company. 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. ASU 2016-02 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 being that the present value of the remaining lease payments 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. As detailed in Note 13 of the 2016 10-K, the undiscounted contractual cash payments remaining on leased properties is $213 million as of December 31, 2016. 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. As a result, the Company retrospectively applied the guidance to the 2016 balance sheet by reclassifying $24.6 million from deferred income taxes (asset) to deferred income taxes, net (liability) on the Condensed Consolidated Balance Sheet. In May 2014, FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers” (“ASU 2014-09”), which provides guidance for revenue recognition. ASU 2014-09 affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of non-financial assets, and supersedes the revenue recognition requirements in Topic 605, “Revenue Recognition,” and most industry-specific guidance. The standard’s core principle is that a company will 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. In doing so, companies will need to use more judgment and make more estimates than under the current guidance. Specifically in situations where multiple performance obligations exist within the contract, the use of estimates is required to allocate the transaction price to each separate performance obligation. Historically 70% or more of the Company’s revenue is in the form of commissions paid by insurance carriers. Commissions are earned upon the effective date of bound coverage, and no significant performance obligation remains in those arrangements after coverage is bound. The Company is currently evaluating the approximately 30% of revenue earned in the form of fees against the requirements of this pronouncement. Fees are predominantly in our National Programs and Services Segments, and to a lesser extent in the large accounts business within our Retail Segment. At the conclusion of this evaluation it may be determined that fee revenue from certain agreements will be recognized in earlier periods under the new guidance in comparison to our current accounting policies and others will be recognized in later periods. Based upon the work completed to date, management does not expect the overall impact to be material. ASU 2014-09 is effective for the Company beginning January 1, 2018, after FASB voted to delay the effective date by one year. At that time, the Company may adopt the new standard under the full retrospective approach or the modified retrospective approach. We do not anticipate a material change in our internal control framework necessitated by the adoption of ASU 2014-09.

- Definition

The entire disclosure for condensed financial information, including the financial position, cash flows, and the results of operations of the registrant (parent company) as of the same dates or for the same periods for which audited consolidated financial statements are being presented. Alternatively, the details of this disclosure can be reported by the specific parent company taxonomy elements, indicating the appropriate date and period contexts in an instance document.

+ References + Details

Net Income Per Share

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

Net Income Per Share

Basic EPS is computed based on the weighted average number of common shares (including restricted shares) issued and outstanding during the period. Diluted EPS 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 following is a reconciliation between basic and diluted weighted average shares outstanding:



	For the three months ended March 31,
(in thousands, except per share data)	2017			2016
Net income	$	70,110		$	62,070
Net income attributable to unvested awarded performance stock	(1,685		)	(1,451		)
Net income attributable to common shares	$	68,425		$	60,619
Weighted average number of common shares outstanding – basic	140,112			138,793
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic	(3,368		)	(3,245		)
Weighted average number of common shares outstanding for basic earnings per common share	136,744			135,548
Dilutive effect of stock options	2,282			1,392
Weighted average number of shares outstanding – diluted	139,026			136,940
Net income per share:
Basic	$	0.50		$	0.45
Diluted	$	0.49		$	0.44

Business Combinations

3 Months Ended

Mar. 31, 2017

Business Combinations [Abstract]

Business Combinations

During the three months ended March 31, 2017, Brown & Brown did not acquire any insurance intermediaries, however there were miscellaneous adjustments recorded to the purchase price allocation of certain prior acquisitions completed within the last twelve months as permitted by Accounting Standards Codification 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 consummated after January 1, 2009 included 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 Condensed Consolidated Statement of Income when incurred.

The fair value of earn-out obligations is based on 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 on the acquisition date and the complexity of the underlying valuation work, certain amounts included in the Company’s Condensed Consolidated Financial Statements may be provisional and thus subject to further adjustments within the permitted measurement period, as defined in ASC 805. For the three months ended March 31, 2017, several adjustments were made within the permitted measurement period that resulted in an increase in the aggregate purchase price of the affected acquisitions of $489,720 relating to the assumption of certain liabilities. These measurement period adjustments have been reflected as current period adjustments in the three months ended March 31, 2017 in accordance with the guidance in ASU 2015-16 "Business Combinations". The measurement period adjustments primarily impacted goodwill, with no effect on earnings or cash in the current period.

The following table summarizes the changes to purchase price allocations 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		Note Payable		Other Payable		Recorded Earn-Out Payable			Net Assets Acquired			Maximum Potential Earn- Out Payable
Other	Various	Various	—		—		—		(211		)	(211		)	—
Total			$	—	$	—	$	—	$	(211	)	$	(211	)	$	—

The following table summarizes the adjustments made to the estimated fair values of the aggregate assets and liabilities for prior year acquisitions as of the date of each acquisition.



(in thousands)	Other			Total
Other current assets	93			93
Goodwill	429			429
Purchased customer accounts	(32		)	(32		)
Total assets acquired	490			490
Other current liabilities	(12		)	(12		)
Deferred income tax, net	(689		)	(689		)
Total liabilities assumed	(701		)	(701		)
Net assets acquired	$	(211	)	$	(211	)

As of March 31, 2017, 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 three months ended March 31, 2017 and 2016, were as follows:



	For the three months ended March 31,
(in thousands)	2017			2016
Balance as of the beginning of the period	$	63,821		$	78,387
Additions to estimated acquisition earn-out payables	(211		)	606
Payments for estimated acquisition earn-out payables	(10,230		)	(9,077		)
Subtotal	53,380			69,916
Net change in earnings from estimated acquisition earn-out payables:
Change in fair value on estimated acquisition earn-out payables	3,335			(1,563		)
Interest expense accretion	693			742
Net change in earnings from estimated acquisition earn-out payables	4,028			(821		)
Balance as of March 31,	$	57,408		$	69,095

Of the $57.4 million estimated acquisition earn-out payables as of March 31, 2017, $35.3 million was recorded as accounts payable and $22.1 million was recorded as other non-current liabilities. As of March 31, 2017, the maximum future acquisition contingency payments related to all acquisitions was $106.4 million. Included within the additions to estimated acquisition earn-out payables are any adjustments to opening balance sheet items within the allowable measurement period, which may therefore differ from previously reported amounts.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

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+ Details

Goodwill

3 Months Ended

Mar. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

Goodwill is subject to at least an annual assessment for impairment by applying a fair value-based test. The Company completed its most recent annual assessment as of November 30, 2016, and identified no impairment as a result of the evaluation. The changes in the table below represent adjustments recorded to the purchase price allocation of certain prior acquisitions completed within the last twelve months as permitted by Accounting Standards Codification Topic 805 — Business Combinations (“ASC 805”).

The changes in the carrying value of goodwill by reportable segment for the three months ended March 31, 2017 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	(133		)	—		(127		)	689		429
Balance as of March 31, 2017	$	1,354,534		$	901,294	$	284,742		$	135,261	$	2,675,831

- 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

3 Months Ended

Mar. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Amortizable Intangible Assets

Amortizable intangible assets at March 31, 2017 and December 31, 2016 consisted of the following:



	March 31, 2017								December 31, 2016
(in thousands)	Gross Carrying Value		Accumulated Amortization			Net Carrying Value		Weighted Average Life (Years)(1)	Gross Carrying Value		Accumulated Amortization			Net Carrying Value		Weighted Average Life (Years)⁽¹⁾
Purchased customer accounts	$	1,447,280	$	(763,026	)	$	684,254	15.0	$	1,447,680	$	(741,770	)	$	705,910	15.0
Non-compete agreements	29,668		(28,403		)	1,265		6.8	29,668		(28,124		)	1,544		6.8
Total	$	1,476,948	$	(791,429	)	$	685,519		$	1,477,348	$	(769,894	)	$	707,454


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

Amortization expense for amortizable intangible assets for the years ending December 31, 2017, 2018, 2019, 2020 and 2021 is estimated to be $84.9 million, $79.6 million, $75.1 million, $67.7 million, and $64.5 million, respectively.

Long-Term Debt

3 Months Ended

Mar. 31, 2017

Debt Disclosure [Abstract]

Long-Term Debt

Long-term debt at March 31, 2017 and December 31, 2016 consisted of the following:



(in thousands)	March 31, 2017			December 31, 2016
Current portion of long-term debt:
Current portion of 5-year term loan facility expires 2019	$	55,000		$	55,000
Short-term promissory note	—			500
Total current portion of long-term debt	55,000			55,500
Long-term debt:
Note agreements:
4.500% senior notes, Series E, quarterly interest payments, balloon due 2018	100,000			100,000
4.200% senior notes, semi-annual interest payments, net of the unamortized discount, balloon due 2024	498,825			498,785
Total notes	598,825			598,785
Credit agreements:
5-year term-loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires May 20, 2019	412,500			426,250
5-year revolving-loan facility, periodic interest payments, LIBOR plus up to 1.500%, plus commitment fees up to 0.250%, expires May 20, 2019	—			—
Total credit agreements	412,500			426,250
Debt issuance costs (contra)	(6,281		)	(6,663		)
Total long-term debt, less unamortized discount and debt issuance costs	1,005,044			1,018,372
Current portion of long-term debt	55,000			55,500
Total debt	$	1,060,044		$	1,073,872

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 are 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 Senior 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 Senior Notes were redeemed at maturity using cash proceeds to pay off the principal of $25.0 million plus any remaining accrued interest. As of March 31, 2017, there was an outstanding debt balance issued under the provisions of the Master Agreement of $100.0 million.

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 on the better of the Company’s net debt leverage ratio or a non-credit enhanced senior unsecured long-term debt rating. Based on 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 on 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 on 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. As of March 31, 2017 and December 31, 2016, there was an outstanding debt balance issued under the provisions of the Credit Facility in total of $467.5 million and $481.3 million respectively, with no borrowings outstanding relative to the revolving loan. Per the terms of the agreement, a scheduled principal payment of $13.8 million is due on June 30, 2017.

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 March 31, 2017 and December 31, 2016, there was an outstanding debt balance of $500.0 million exclusive of the associated discount balance.

In conjunction with the acquisition of Social Security Advocates for the Disabled (SSAD) effective February 1, 2016, the company added a $0.5 million promissory note incurred as a payment to the sellers and payable after the one-year anniversary of the acquisition. The note had a nominal rate of interest 0.810%. On March 10, 2017, the promissory note was settled, plus any outstanding accrued interest, using cash.

The Master Agreement and the Credit Agreement all 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 March 31, 2017 and December 31, 2016.

The 30-day Adjusted LIBOR Rate as of March 31, 2017 was 1.000%.

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

3 Months Ended

Mar. 31, 2017

Supplemental Cash Flow Elements [Abstract]

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



	For the three months ended March 31,
(in thousands)	2017		2016
Cash paid during the period for:
Interest	$	14,531	$	14,323
Income taxes	$	2,704	$	6,922

Brown & Brown’s significant non-cash investing and financing activities are summarized as follows. The changes in the table below represent adjustments recorded to the purchase price allocation of certain prior acquisitions completed within the last twelve months as permitted by Accounting Standards Codification Topic 805 — Business Combinations (“ASC 805”). These adjustments had no affect on cash or the Condensed Consolidated Statements of Income.



	For the three months ended March 31,
(in thousands)	2017			2016
Other payable issued for purchased customer accounts	$	—		$	300
Change in estimated acquisition earn-out payables and related charges	$	(211	)	$	606
Notes payable issued or assumed for purchased customer accounts	$	—		$	492

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



	Balance as of March 31,
(in thousands)	2017		2016
Table to reconcile cash and cash equivalents inclusive of restricted cash
Cash and cash equivalents	$	546,721	$	401,846
Restricted cash	279,368		231,075
Total cash and cash equivalents inclusive of restricted cash at the end of the period	$	826,089	$	632,921

The following is a reconciliation of cash and cash equivalents inclusive of restricted cash as of December 31, 2016 and 2015.



	Balance as of December, 31
(in thousands)	2016		2015
Table to reconcile cash and cash equivalents inclusive of restricted cash
Cash and cash equivalents	$	515,646	$	443,420
Restricted cash	265,637		229,753
Total cash and cash equivalents inclusive of restricted cash at the end of the period	$	781,283	$	673,173

Legal and Regulatory Proceedings	3 Months Ended
Legal and Regulatory Proceedings	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Legal and Regulatory Proceedings	Legal and Regulatory Proceedings The Company is involved in numerous pending or threatened proceedings by or against Brown & Brown, Inc. or one or more of its subsidiaries that arise in the ordinary course of business. The damages that may be claimed against the Company in these various proceedings are in some cases substantial, including in certain instances claims for punitive or extraordinary damages. Some of these claims and lawsuits have been resolved, others are in the process of being resolved and others are still in the investigation or discovery phase. The Company will continue to respond appropriately to these claims and lawsuits and to vigorously protect its interests. During the quarter, the Company was successful in settling a lawsuit it had brought against certain former employees of Brown & Brown, their employer, AssuredPartners, Inc. and certain key executives of AssuredPartners. The settlement includes a payment of $20,000,000 by AssuredPartners to Brown & Brown in exchange for releasing certain individuals from restrictive covenants in the employment contracts they had signed with the Company and provides protection for current Brown & Brown teammates from continued solicitation for employment by AssuredPartners. The proceeds of the settlement were received in March 2017 and were recorded in the Other income line in the Statement of Income. 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 on 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.

Segment Information

3 Months Ended

Mar. 31, 2017

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 a 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, and retail operations in Bermuda and the Cayman Islands. These operations earned $3.0 million and $2.8 million of total revenues for the three months ended March 31, 2017 and 2016, respectively. Long-lived assets held outside of the United States as of March 31, 2017 and 2016 were not material.

The accounting policies of the reportable segments are the same as those described in Note 1 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2016. 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, corporate-related items, including the inter-company interest expense charge to the reporting segment, and the elimination of inter-segment activities.



	For the three months ended March 31, 2017
(in thousands)	Retail		National Programs		Wholesale Brokerage		Services		Other			Total
Total revenues	$	239,287	$	101,183	$	65,247	$	39,326	$	20,037		$	465,080
Investment income	$	2	$	74	$	—	$	80	$	87		$	243
Amortization	$	10,647	$	6,904	$	2,931	$	1,138	$	—		$	21,620
Depreciation	$	1,389	$	1,959	$	490	$	399	$	1,861		$	6,098
Interest expense	$	8,576	$	10,035	$	1,675	$	961	$	(11,565	)	$	9,682
Income before income taxes	$	48,855	$	12,527	$	15,265	$	6,121	$	28,199		$	110,967
Total assets	$	3,861,118	$	2,634,008	$	1,121,109	$	363,173	$	(2,781,964	)	$	5,197,444
Capital expenditures	$	1,136	$	1,080	$	378	$	150	$	288		$	3,032



	For the three months ended March 31, 2016
(in thousands)	Retail		National Programs		Wholesale Brokerage		Services		Other			Total
Total revenues	$	232,188	$	101,070	$	53,414	$	36,568	$	933		$	424,173
Investment income	$	21	$	248	$	3	$	64	$	82		$	418
Amortization	$	10,989	$	7,108	$	2,442	$	1,065	$	6		$	21,610
Depreciation	$	1,637	$	1,929	$	496	$	487	$	769		$	5,318
Interest expense	$	10,403	$	12,590	$	247	$	1,236	$	(14,579	)	$	9,897
Income before income taxes	$	50,452	$	13,803	$	14,562	$	5,052	$	18,680		$	102,549
Total assets	$	3,531,100	$	2,499,870	$	888,745	$	324,269	$	(2,251,024	)	$	4,992,960
Capital expenditures	$	1,049	$	1,932	$	592	$	205	$	474		$	4,252

Investments

3 Months Ended

Mar. 31, 2017

Investments, Debt and Equity Securities [Abstract]

Investments

At March 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 municipals	$	26,648	$	6	$	(64	)	$	26,590
Corporate debt	1,982		14		—			1,996
Total	$	28,630	$	20	$	(64	)	$	28,586

At March 31, 2017, the Company held $26.6 million in fixed income securities composed of U.S. Treasury securities, securities issued by U.S. Government agencies and municipals, and $2.0 million issued by corporations with investment grade ratings. Of that total, $11.4 million is classified as short-term investments on the Consolidated Balance Sheet as maturities are less than one-year. Additionally, the Company holds $9.2 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 March 31, 2017:



	Less than 12 Months					12 Months or More				Total
(in thousands)	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
U.S. Treasury securities, obligations of U.S. Government agencies and municipals	$	23,601	$	(64	)	$	—	$	—	$	23,601	$	(64	)
Corporate debt	276		—			—		—		276		—
Total	$	23,877	$	(64	)	$	—	$	—	$	23,877	$	(64	)

The unrealized losses were caused by interest rate increases. At March 31, 2017, the Company had 19 securities in an unrealized loss position. The corporate securities are highly rated securities with no indicators of potential impairment. Based on 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 March 31, 2017.

At December 31, 2016, 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 municipals	$	26,280	$	11	$	(59	)	$	26,232
Corporate debt	2,358		13		(1		)	2,370
Total	$	28,638	$	24	$	(60	)	$	28,602

At December 31, 2016, the Company held $26.2 million in fixed income securities composed of U.S. Treasury securities, securities issued by U.S. Government agencies and municipals, and 2.4 million issued by corporations with investment grade ratings. Of that total, $5.6 million is classified as short-term investments on the Consolidated Balance Sheet as maturities are less than one-year. Additionally, the Company holds 9.5 million in short-term investments which are related to time deposits held with various financial institutions.



	Less than 12 Months					12 Months or More				Total
(in thousands)	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
U.S. Treasury securities, obligations of U.S. Government agencies and municipals	$	14,663	$	(59	)	$	—	$	—	$	14,663	$	(59	)
Foreign Government	—		—			—		—		—		—
Corporate debt	1,001		(1		)	—		—		1,001		(1		)
Total	$	15,664	$	(60	)	$	—	$	—	$	15,664	$	(60	)

The unrealized losses from corporate issuers were caused by interest rate increases. At December 31, 2016, the Company had 20 securities in an unrealized loss position. The corporate securities are highly rated securities with no indicators of potential impairment. Based on 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, 2016.

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



(in thousands)	Amortized Cost		Fair Value
Years to maturity:
Due in one year or less	$	11,441	$	11,432
Due after one year through five years	16,859		16,813
Due after five years	330		341
Total	$	28,630	$	28,586

The amortized cost and estimated fair value of the fixed maturity securities at December 31, 2016 by contractual maturity are set forth below:



(in thousands)	Amortized Cost		Fair Value
Years to maturity:
Due in one year or less	$	5,551	$	5,554
Due after one year through five years	22,757		22,708
Due after five years	330		340
Total	$	28,638	$	28,602

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 $0.4 million. This along with maturing time deposits yielded total cash proceeds from the sale of investments of $0.7 million in the period of January 1, 2017 to March 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 March 31, 2017 were insignificant.

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

At March 31, 2017, investments with a fair value of approximately $4.0 million were on deposit with state insurance departments to satisfy regulatory requirements.

- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References + Details

Losses and Loss Adjustment Reserve

3 Months Ended

Mar. 31, 2017

Reinsurance Disclosures [Abstract]

Losses and Loss Adjustment Reserve

Although the reinsurers are liable to the Company for amounts reinsured, our subsidiary, Wright Flood 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 are as follows:



	Period from January 1, 2017 to March 31, 2017
(in thousands)	Written			Earned
Direct premiums	$	113,167		$	141,688
Ceded premiums	(113,165		)	(141,686		)
Net premiums	$	2		$	2

All premiums written by Wright Flood under the National Flood Insurance Program are 100% ceded to FEMA, for which Wright Flood received a 30.9% expense allowance from January 1, 2017 through March 31, 2017. For the period from January 1, 2017 through March 31, 2017, the Company ceded $112.8 million of written premiums.

Effective April 1, 2014, Wright Flood is also a party to a quota share agreement whereby it cedes 100% of its gross excess flood premiums, excluding fees, to Arch Reinsurance Company and receives a 30.5% commission. Wright Flood ceded $0.3 million for the period from January 1, 2017 through March 31, 2017. No loss data exists on this agreement.

Wright Flood 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 March 31, 2017, no ceded unpaid losses and loss adjustment expenses or incurred but not reported expenses for Homeowners, Private Passenger Auto Liability and Other Liability Occurrence existed.

As of March 31, 2017 the Condensed Consolidated Balance Sheet contained reinsurance recoverable of $39.2 million and prepaid reinsurance premiums of $280.1 million. There was no net activity in the reserve for losses and loss adjustment expense during the period January 1, 2017 through March 31, 2017, as Wright Flood's direct premiums written were 100% ceded to two reinsurers. The balance of the reserve for losses and loss adjustment expense, excluding related reinsurance recoverable, as of March 31, 2017 was $39.2 million.

Statutory Financial Information	3 Months Ended
Statutory Financial Information	Mar. 31, 2017
Statutory Accounting Practices [Abstract]
Statutory Financial Information	Statutory Financial Data Wright Flood maintains capital in excess of the minimum statutory amount of $7.5 million as required by regulatory authorities. The unaudited statutory capital and surplus of Wright Flood was $24.3 million at March 31, 2017 and $23.5 million as of December 31, 2016. For the period from January 1, 2017 through March 31, 2017, Wright Flood generated statutory net income of $0.7 million. For the period from January 1, 2016 through December 31, 2016, Wright Flood generated statutory net income of $8.2 million.

Subsidiary Dividend Restrictions	3 Months Ended
Subsidiary Dividend Restrictions	Mar. 31, 2017
Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract]
Subsidiary Dividend Restrictions	Subsidiary Dividend Restrictions Under the insurance regulations of Texas, where Wright Flood is incorporated, the maximum amount of ordinary dividends that Wright Flood 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 Wright Flood’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 2016 and the maximum dividend payout that may be made in 2017 without prior approval is $8.2 million.

Shareholders' Equity	3 Months Ended
Shareholders' Equity	Mar. 31, 2017
Equity [Abstract]
Shareholders' Equity	Shareholders’ Equity 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.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 4.E)
-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

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+ Details

Nature of Operations (Policies)	3 Months Ended
Nature of Operations (Policies)	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	four
Basis of Accounting	The accompanying unaudited Condensed Consolidated Financial Statements have been prepared in accordance with U.S. GAAP for interim financial information and with the instructions for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. These unaudited Condensed Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and the Notes thereto set forth in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements

Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2017

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 three months ended March 31,
(in thousands, except per share data)	2017			2016
Net income	$	70,110		$	62,070
Net income attributable to unvested awarded performance stock	(1,685		)	(1,451		)
Net income attributable to common shares	$	68,425		$	60,619
Weighted average number of common shares outstanding – basic	140,112			138,793
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic	(3,368		)	(3,245		)
Weighted average number of common shares outstanding for basic earnings per common share	136,744			135,548
Dilutive effect of stock options	2,282			1,392
Weighted average number of shares outstanding – diluted	139,026			136,940
Net income per share:
Basic	$	0.50		$	0.45
Diluted	$	0.49		$	0.44

Business Combinations (Tables)

3 Months Ended

Mar. 31, 2017

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		Note Payable		Other Payable		Recorded Earn-Out Payable			Net Assets Acquired			Maximum Potential Earn- Out Payable
Other	Various	Various	—		—		—		(211		)	(211		)	—
Total			$	—	$	—	$	—	$	(211	)	$	(211	)	$	—

Estimated fair values of aggregate assets and liabilities acquired

The following table summarizes the adjustments made to the estimated fair values of the aggregate assets and liabilities for prior year acquisitions as of the date of each acquisition.



(in thousands)	Other			Total
Other current assets	93			93
Goodwill	429			429
Purchased customer accounts	(32		)	(32		)
Total assets acquired	490			490
Other current liabilities	(12		)	(12		)
Deferred income tax, net	(689		)	(689		)
Total liabilities assumed	(701		)	(701		)
Net assets acquired	$	(211	)	$	(211	)

Additions, payments, and net changes, as well as interest expense accretion on estimated acquisition earn-out payables

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



	For the three months ended March 31,
(in thousands)	2017			2016
Balance as of the beginning of the period	$	63,821		$	78,387
Additions to estimated acquisition earn-out payables	(211		)	606
Payments for estimated acquisition earn-out payables	(10,230		)	(9,077		)
Subtotal	53,380			69,916
Net change in earnings from estimated acquisition earn-out payables:
Change in fair value on estimated acquisition earn-out payables	3,335			(1,563		)
Interest expense accretion	693			742
Net change in earnings from estimated acquisition earn-out payables	4,028			(821		)
Balance as of March 31,	$	57,408		$	69,095

Goodwill (Tables)

3 Months Ended

Mar. 31, 2017

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 three months ended March 31, 2017 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	(133		)	—		(127		)	689		429
Balance as of March 31, 2017	$	1,354,534		$	901,294	$	284,742		$	135,261	$	2,675,831

Amortizable Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Amortizable Intangible Assets

Amortizable intangible assets at March 31, 2017 and December 31, 2016 consisted of the following:



	March 31, 2017								December 31, 2016
(in thousands)	Gross Carrying Value		Accumulated Amortization			Net Carrying Value		Weighted Average Life (Years)(1)	Gross Carrying Value		Accumulated Amortization			Net Carrying Value		Weighted Average Life (Years)⁽¹⁾
Purchased customer accounts	$	1,447,280	$	(763,026	)	$	684,254	15.0	$	1,447,680	$	(741,770	)	$	705,910	15.0
Non-compete agreements	29,668		(28,403		)	1,265		6.8	29,668		(28,124		)	1,544		6.8
Total	$	1,476,948	$	(791,429	)	$	685,519		$	1,477,348	$	(769,894	)	$	707,454


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

Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2017

Debt Disclosure [Abstract]

Long-Term Debt Instrument

Long-term debt at March 31, 2017 and December 31, 2016 consisted of the following:



(in thousands)	March 31, 2017			December 31, 2016
Current portion of long-term debt:
Current portion of 5-year term loan facility expires 2019	$	55,000		$	55,000
Short-term promissory note	—			500
Total current portion of long-term debt	55,000			55,500
Long-term debt:
Note agreements:
4.500% senior notes, Series E, quarterly interest payments, balloon due 2018	100,000			100,000
4.200% senior notes, semi-annual interest payments, net of the unamortized discount, balloon due 2024	498,825			498,785
Total notes	598,825			598,785
Credit agreements:
5-year term-loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires May 20, 2019	412,500			426,250
5-year revolving-loan facility, periodic interest payments, LIBOR plus up to 1.500%, plus commitment fees up to 0.250%, expires May 20, 2019	—			—
Total credit agreements	412,500			426,250
Debt issuance costs (contra)	(6,281		)	(6,663		)
Total long-term debt, less unamortized discount and debt issuance costs	1,005,044			1,018,372
Current portion of long-term debt	55,000			55,500
Total debt	$	1,060,044		$	1,073,872

- 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
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-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-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
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-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
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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-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=6928386&loc=d3e21521-112644

+ Details

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

3 Months Ended

Mar. 31, 2017

Supplemental Cash Flow Elements [Abstract]

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



	For the three months ended March 31,
(in thousands)	2017		2016
Cash paid during the period for:
Interest	$	14,531	$	14,323
Income taxes	$	2,704	$	6,922



	For the three months ended March 31,
(in thousands)	2017			2016
Other payable issued for purchased customer accounts	$	—		$	300
Change in estimated acquisition earn-out payables and related charges	$	(211	)	$	606
Notes payable issued or assumed for purchased customer accounts	$	—		$	492

Segment Information (Tables)

3 Months Ended

Mar. 31, 2017

Segment Reporting Information [Line Items]

Segment Information



	For the three months ended March 31, 2017
(in thousands)	Retail		National Programs		Wholesale Brokerage		Services		Other			Total
Total revenues	$	239,287	$	101,183	$	65,247	$	39,326	$	20,037		$	465,080
Investment income	$	2	$	74	$	—	$	80	$	87		$	243
Amortization	$	10,647	$	6,904	$	2,931	$	1,138	$	—		$	21,620
Depreciation	$	1,389	$	1,959	$	490	$	399	$	1,861		$	6,098
Interest expense	$	8,576	$	10,035	$	1,675	$	961	$	(11,565	)	$	9,682
Income before income taxes	$	48,855	$	12,527	$	15,265	$	6,121	$	28,199		$	110,967
Total assets	$	3,861,118	$	2,634,008	$	1,121,109	$	363,173	$	(2,781,964	)	$	5,197,444
Capital expenditures	$	1,136	$	1,080	$	378	$	150	$	288		$	3,032



	For the three months ended March 31, 2016
(in thousands)	Retail		National Programs		Wholesale Brokerage		Services		Other			Total
Total revenues	$	232,188	$	101,070	$	53,414	$	36,568	$	933		$	424,173
Investment income	$	21	$	248	$	3	$	64	$	82		$	418
Amortization	$	10,989	$	7,108	$	2,442	$	1,065	$	6		$	21,610
Depreciation	$	1,637	$	1,929	$	496	$	487	$	769		$	5,318
Interest expense	$	10,403	$	12,590	$	247	$	1,236	$	(14,579	)	$	9,897
Income before income taxes	$	50,452	$	13,803	$	14,562	$	5,052	$	18,680		$	102,549
Total assets	$	3,531,100	$	2,499,870	$	888,745	$	324,269	$	(2,251,024	)	$	4,992,960
Capital expenditures	$	1,049	$	1,932	$	592	$	205	$	474		$	4,252

Investments (Tables)

3 Months Ended

Mar. 31, 2017

Schedule of Held-to-maturity Securities [Line Items]

Schedule of Investments in Fixed Maturity Securities

At March 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 municipals	$	26,648	$	6	$	(64	)	$	26,590
Corporate debt	1,982		14		—			1,996
Total	$	28,630	$	20	$	(64	)	$	28,586

At December 31, 2016, 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 municipals	$	26,280	$	11	$	(59	)	$	26,232
Corporate debt	2,358		13		(1		)	2,370
Total	$	28,638	$	24	$	(60	)	$	28,602

Summary of Unrealized Loss Position

he 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, 2016:



	Less than 12 Months					12 Months or More				Total
(in thousands)	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
U.S. Treasury securities, obligations of U.S. Government agencies and municipals	$	14,663	$	(59	)	$	—	$	—	$	14,663	$	(59	)
Foreign Government	—		—			—		—		—		—
Corporate debt	1,001		(1		)	—		—		1,001		(1		)
Total	$	15,664	$	(60	)	$	—	$	—	$	15,664	$	(60	)



	Less than 12 Months					12 Months or More				Total
(in thousands)	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
U.S. Treasury securities, obligations of U.S. Government agencies and municipals	$	23,601	$	(64	)	$	—	$	—	$	23,601	$	(64	)
Corporate debt	276		—			—		—		276		—
Total	$	23,877	$	(64	)	$	—	$	—	$	23,877	$	(64	)

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 March 31, 2017 by contractual maturity are set forth below:



(in thousands)	Amortized Cost		Fair Value
Years to maturity:
Due in one year or less	$	11,441	$	11,432
Due after one year through five years	16,859		16,813
Due after five years	330		341
Total	$	28,630	$	28,586

The amortized cost and estimated fair value of the fixed maturity securities at December 31, 2016 by contractual maturity are set forth below:



(in thousands)	Amortized Cost		Fair Value
Years to maturity:
Due in one year or less	$	5,551	$	5,554
Due after one year through five years	22,757		22,708
Due after five years	330		340
Total	$	28,638	$	28,602

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
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Net income	$ 70,110	$ 62,070
Net income attributable to unvested awarded performance stock	(1,685)	(1,451)
Net income attributable to common shares	$ 68,425	$ 60,619
Weighted average number of common shares outstanding - basic (in shares)	140,112	138,793
Less unvested awarded performance stock included in weighted average number of common shares outstanding - basic (in shares)	(3,368)	(3,245)
Weighted average number of common shares outstanding for basic earnings per common share (in shares)	136,744	135,548
Dilutive effect of stock options (in shares)	2,282	1,392
Weighted average number of shares outstanding - diluted (in shares)	139,026	136,940
Basic (in dollars per share)	$ 0.50	$ 0.45
Diluted (in dollars per share)	$ 0.49	$ 0.44

Business Combinations - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2017	Apr. 01, 2016	Mar. 31, 2016	Apr. 01, 2015
Business Acquisition [Line Items]
Aggregate purchase price of acquisitions	$ 489,720
Payments to Acquire Businesses, Gross	0
Goodwill assigned	429,000
Estimated acquisition earn-out payables	57,408,000	$ 63,821,000	$ 69,095,000	$ 78,387,000
Accounts payable
Business Acquisition [Line Items]
Estimated acquisition earn-out payables	35,300,000
Other non-current liability
Business Acquisition [Line Items]
Estimated acquisition earn-out payables	$ 22,100,000

Business Combinations - Acquisitions Accounted for Business Combinations (Detail)	3 Months Ended
	Mar. 31, 2017 USD ($)
Business Combination, Separately Recognized Transactions [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	$ 701,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	490,000
Cash Paid	0
Business Acquisition Cost of Entity Note Payable	0
Other Payable	0
Recorded Earn-Out Payable	(211,000)
Net Assets Acquired	(211,000)
Maximum Potential Earn- Out Payable	0
Other current assets	93,000
Goodwill	429,000
Purchased customer accounts	(32,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	12,000
Deferred Tax Liabilities, Net	689,000
Other Acquisitions [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	701,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	490,000
Net Assets Acquired	(211,000)
Other current assets	93,000
Goodwill	429,000
Purchased customer accounts	(32,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	12,000
Deferred Tax Liabilities, Net	689,000
Other Acquisitions [Member] \| Various
Business Combination, Separately Recognized Transactions [Line Items]
Cash Paid	0
Business Acquisition Cost of Entity Note Payable	0
Other Payable	0
Recorded Earn-Out Payable	(211,000)
Net Assets Acquired	(211,000)
Maximum Potential Earn- Out Payable	$ 0

Business Combinations - Estimated Fair Values of Aggregate Assets and Liabilities Acquired (Detail)	3 Months Ended
	Mar. 31, 2017 USD ($)
Fair Value Of Assets And Liabilities Statement [Line Items]
Payments to Acquire Businesses, Gross	$ 0
Recorded Earn-Out Payable	(211,000)
Other current assets	93,000
Goodwill	429,000
Purchased customer accounts	(32,000)
Total assets acquired	490,000
Other current liabilities	(12,000)
Deferred Tax Liabilities, Net	(689,000)
Total liabilities assumed	(701,000)
Net assets acquired	(211,000)
Maximum Potential Earn- Out Payable	0
Other Acquisitions [Member]
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets	93,000
Goodwill	429,000
Purchased customer accounts	(32,000)
Total assets acquired	490,000
Other current liabilities	(12,000)
Deferred Tax Liabilities, Net	(689,000)
Total liabilities assumed	(701,000)
Net assets acquired	$ (211,000)

Business Combinations - Additions, Payments, and Net Changes, as well as Interest Expense Accretion on Estimated Acquisition Earn-Out Payables (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Business Acquisition [Line Items]
Maximum Future Contingency payments Acquisitions	$ 106,400
Additions to estimated acquisition earn-out payables	(211)	$ 606
Payments for estimated acquisition earn-out payables	(10,230)	(9,077)
Subtotal	53,380	69,916
Net change in earnings from estimated acquisition earn-out payables:
Change in fair value on estimated acquisition earn-out payables	3,335	(1,563)
Interest expense accretion	693	742
Net change in earnings from estimated acquisition earn-out payables	4,028	(821)
Ending balance	$ 57,408	$ 69,095

Goodwill - Changes in Carrying Value of Goodwill by Operating Segment (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 2,675,402
Goodwill of acquired businesses	429
Ending balance	2,675,831
0
Goodwill [Roll Forward]
Beginning balance	1,354,667
Goodwill of acquired businesses	(133)
Ending balance	1,354,534
National Programs
Goodwill [Roll Forward]
Beginning balance	901,294
Goodwill of acquired businesses	0
Ending balance	901,294
Wholesale Brokerage
Goodwill [Roll Forward]
Beginning balance	284,869
Goodwill of acquired businesses	(127)
Ending balance	284,742
Services
Goodwill [Roll Forward]
Beginning balance	134,572
Goodwill of acquired businesses	689
Ending balance	$ 135,261

Amortizable Intangible Assets - Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 1,476,948		$ 1,477,348
Accumulated Amortization	(791,429)		(769,894)
Net Carrying Value	685,519		707,454
Purchased customer accounts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1,447,280		1,447,680
Accumulated Amortization	(763,026)		(741,770)
Net Carrying Value	$ 684,254		705,910
Weighted Average Life (Years)	15 years	15 years
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 29,668		29,668
Accumulated Amortization	(28,403)		(28,124)
Net Carrying Value	$ 1,265		$ 1,544
Weighted Average Life (Years)	6 years 9 months 18 days	6 years 9 months 18 days

Amortizable Intangible Assets - Additional Information (Detail) $ in Millions	Mar. 31, 2017 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense estimated, year one (2015)	$ 84.9
Amortization expense estimated, year two (2016)	79.6
Amortization expense estimated, year three (2017)	75.1
Amortization expense estimated, year four (2018)	67.7
Amortization expense estimated, year five (2019)	$ 64.5

Long-Term Debt - Long-Term Debt Instrument (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Jan. 15, 2015
Debt Instrument [Line Items]
Total current portion of long-term debt	$ 55,000	$ 55,500
Total notes	598,825	598,785
Long-term credit agreements	412,500	426,250
Debt Issuance Costs, Gross	(6,281)	(6,663)
Total long-term debt	1,005,044	1,018,372
Current portion of long-term debt	55,000	55,500
Total debt	1,060,044	1,073,872
Notes Payable, Current	0	500
5.660% senior notes, Series C, semi-annual interest payments, balloon due 2016
Debt Instrument [Line Items]
Current portion of senior notes			$ 25,000
4.500% senior notes, Series E, quarterly interest payments, balloon due 2018
Debt Instrument [Line Items]
Total notes	100,000	100,000
4.200% senior notes, semi-annual interest payments, net of the unamortized discount, balloon due 2024
Debt Instrument [Line Items]
Total notes	498,825	498,785
5-year term-loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires May 20, 2019
Debt Instrument [Line Items]
Current portion of loan facility	55,000	55,000
Long-term credit agreements	412,500	426,250
5-year revolving-loan facility, periodic interest payments, LIBOR plus up to 1.500%, plus commitment fees up to 0.250%, expires May 20, 2019
Debt Instrument [Line Items]
Long-term credit agreements	$ 0	$ 0

Long-Term Debt - Long-Term Debt Instrument (Additional Information) (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
4.500% senior notes, Series E, quarterly interest payments, balloon due 2018
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.50%	4.50%
Debt instrument maturity year	2018	2018
4.200% senior notes, semi-annual interest payments, net of the unamortized discount, 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 May 20, 2019
Debt Instrument [Line Items]
Line of credit facility, expiration period	5 years	5 years
Line of credit facility, expiration date	May 20, 2019	May 20, 2019
5-year term-loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires May 20, 2019 \| LIBOR
Debt Instrument [Line Items]
Debt instrument, variable interest rate	1.75%	1.75%
Five Year Term Loan Facility Expires In Two Thousand Ninteen Current [Member]
Debt Instrument [Line Items]
Debt instrument maturity year	2019	2019
5-year revolving-loan facility, periodic interest payments, LIBOR plus up to 1.500%, plus commitment fees up to 0.250%, expires May 20, 2019
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	May 20, 2019	May 20, 2019
5-year revolving-loan facility, periodic interest payments, LIBOR plus up to 1.500%, plus commitment fees up to 0.250%, expires May 20, 2019 \| LIBOR
Debt Instrument [Line Items]
Debt instrument, variable interest rate	1.50%	1.50%
Wells Fargo [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	$ 800,000	$ 800,000

Long-Term Debt - Narrative (Detail)			3 Months Ended
Long-Term Debt - Narrative (Detail)	Sep. 18, 2014 USD ($)	May 20, 2014 USD ($) extension	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Jan. 15, 2015 USD ($)	Apr. 17, 2014 USD ($)	Sep. 15, 2011 USD ($)	Feb. 01, 2008 USD ($)	Dec. 22, 2006 USD ($)
Debt Instrument [Line Items]
Credit facility, outstanding amount			$ 412,500,000		$ 426,250,000
Potential increased in line of credit facility							$ 500,000,000.0
Unsecured revolving credit facility							800,000,000.0
Unsecured term loans							550,000,000.0
Outstanding debt balance			1,060,044,000		1,073,872,000
5.660% senior notes, Series C, semi-annual interest payments, balloon due 2016
Debt Instrument [Line Items]
Current portion of senior notes						$ 25,000,000
Credit Agreement
Debt Instrument [Line Items]
Credit facility, outstanding amount			467,500,000		481,300,000
Number of extension periods \| extension		2
Extension period		1 year
Unsecured revolving credit facility							$ 1,350,000,000.0
First principal payment			13,800,000
Unsecured Senior Notes
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.20%
Debt instrument, face amount	$ 500,000,000.0
Debt instrument maturity year	2024
Outstanding debt balance			500,000,000		500,000,000
Term Loan
Debt Instrument [Line Items]
Credit facility, outstanding amount		$ 550,000,000.0
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility, outstanding amount	$ 475,000,000	$ 375,000,000
Proceeds from lines of credit			0	$ 0
Uncommitted Facility \| New Master Agreement
Debt Instrument [Line Items]
Credit facility, outstanding amount					0
Master Agreement
Debt Instrument [Line Items]
Unsecured senior notes outstanding			100,000,000
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
Debt instrument interest rate stated percentage								4.50%
New Master Agreement
Debt Instrument [Line Items]
Unsecured senior notes outstanding			$ 1,060,044,000		$ 1,073,872,000
LIBOR
Debt Instrument [Line Items]
30-day Adjusted LIBOR Rate			1.00%
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 \| 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%

Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities - Significant Non-Cash Investing and Financing Activities (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 546,721,000	$ 401,846,000	$ 515,646,000	$ 443,420,000
Restricted Cash and Cash Equivalents	279,368,000	231,075,000	265,637,000	229,753,000
Cash paid during the period for:
Interest	14,531,000	14,323,000
Income taxes	2,704,000	6,922,000
Significant non-cash investing and financing activities
Other payable issued for purchased customer accounts	0	300,000
Change in estimated acquisition earn-out payables and related charges	(211,000)	606,000
Business Acquisition Cost of Entity Note Payable	0	492,000
Cash and Cash Equivalents inclusive of Restricted Cash [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 826,089,000	$ 632,921,000	$ 781,283,000	$ 673,173,000

Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities Restricted Cash (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Cash, Cash Equivalents and Restricted Cash	$ 826,089	$ 632,921
Cash and cash equivalents inclusive of restricted cash at beginning of period	546,721	401,846	$ 515,646	$ 443,420
Cash and Cash Equivalents inclusive of Restricted Cash [Member]
Cash and cash equivalents inclusive of restricted cash at beginning of period	$ 826,089	$ 632,921	$ 781,283	$ 673,173

Segment Information - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Segment	Mar. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| Segment	4
Total revenues	$ 465,080	$ 424,173
London, Bermuda and Cayman Islands
Segment Reporting Information [Line Items]
Total revenues	$ 3,000	$ 2,800

Segment Information - Summarized Financial Information Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total revenues	$ 465,080	$ 424,173
Investment income	243	418
Amortization	21,620	21,610
Depreciation	6,098	5,318
Interest expense	9,682	9,897
Income before income taxes	110,967	102,549
Total assets	5,197,444	4,992,960	$ 5,262,734
Capital expenditures	3,032	4,252
Operating Segments \| 0
Segment Reporting Information [Line Items]
Total revenues	239,287	232,188
Investment income	2	21
Amortization	10,647	10,989
Depreciation	1,389	1,637
Interest expense	8,576	10,403
Income before income taxes	48,855	50,452
Total assets	3,861,118	3,531,100
Capital expenditures	1,136	1,049
Operating Segments \| National Programs
Segment Reporting Information [Line Items]
Total revenues	101,183	101,070
Investment income	74	248
Amortization	6,904	7,108
Depreciation	1,959	1,929
Interest expense	10,035	12,590
Income before income taxes	12,527	13,803
Total assets	2,634,008	2,499,870
Capital expenditures	1,080	1,932
Operating Segments \| Wholesale Brokerage
Segment Reporting Information [Line Items]
Total revenues	65,247	53,414
Investment income	0	3
Amortization	2,931	2,442
Depreciation	490	496
Interest expense	1,675	247
Income before income taxes	15,265	14,562
Total assets	1,121,109	888,745
Capital expenditures	378	592
Operating Segments \| Services
Segment Reporting Information [Line Items]
Total revenues	39,326	36,568
Investment income	80	64
Amortization	1,138	1,065
Depreciation	399	487
Interest expense	961	1,236
Income before income taxes	6,121	5,052
Total assets	363,173	324,269
Capital expenditures	150	205
Other
Segment Reporting Information [Line Items]
Total revenues	20,037	933
Investment income	87	82
Amortization	0	6
Depreciation	1,861	769
Interest expense	(11,565)	(14,579)
Income before income taxes	28,199	18,680
Total assets	(2,781,964)	(2,251,024)
Capital expenditures	$ 288	$ 474

Investments - Schedule of Investments in Fixed Maturity Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Single Maturity Date	$ 9,200	$ 9,500
Cost	28,630	28,638
Gross Unrealized Gains	20	24
Gross Unrealized Losses	(64)	(60)
Fair Value	28,586	28,602
U.S. Treasury securities, obligations of U.S. Government agencies and municipals
Schedule of Available-for-sale Securities [Line Items]
Cost	26,648	26,280
Gross Unrealized Gains	6	11
Gross Unrealized Losses	(64)	(59)
Fair Value	26,590	26,232
Corporate debt
Schedule of Available-for-sale Securities [Line Items]
Cost	1,982	2,358
Gross Unrealized Gains	14	13
Gross Unrealized Losses	0	(1)
Fair Value	$ 1,996	$ 2,370

Investments - Summary of Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	$ 23,877	$ 15,664
Unrealized Losses, Less than 12 Months	(64)	(60)
Fair Value, 12 Months or More	0	0
Unrealized Losses, 12 Months or More	0	0
Fair Value	23,877	15,664
Unrealized Losses	(64)	(60)
U.S. Treasury securities, obligations of U.S. Government agencies and municipals
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	23,601	14,663
Unrealized Losses, Less than 12 Months	(64)	(59)
Fair Value, 12 Months or More	0	0
Unrealized Losses, 12 Months or More	0	0
Fair Value	23,601	14,663
Unrealized Losses	(64)	(59)
Foreign government
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months		0
Unrealized Losses, Less than 12 Months		0
Fair Value, 12 Months or More		0
Unrealized Losses, 12 Months or More		0
Fair Value		0
Unrealized Losses		0
Corporate debt
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	276	1,001
Unrealized Losses, Less than 12 Months	0	(1)
Fair Value, 12 Months or More	0	0
Unrealized Losses, 12 Months or More	0	0
Fair Value	276	1,001
Unrealized Losses	$ 0	$ (1)

Investments - Additional Information (Detail) $ in Millions	3 Months Ended
Investments - Additional Information (Detail) $ in Millions	Mar. 31, 2017 USD ($) Securities	Dec. 31, 2016 Securities
Schedule of Available-for-sale Securities [Line Items]
Number of securities in unrealized loss position \| Securities	19	20
Proceeds from sale of investment in fixed maturity securities	$ 0.4
Investment security maturity date, start	Jan. 01, 2017
Investment security maturity date, End	Mar. 31, 2017
Gross realized gains and losses of securities	insignificant
Investments on deposit with the state insurance department	$ 4.0

Investments - Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Amortized Cost
Due in one year or less	$ 11,441	$ 5,551
Due after one year through five years	16,859	22,757
Due after five years	330	330
Amortized Cost, Total	28,630	28,638
Fair Value
Due in one year or less	11,432	5,554
Due after one year through five years	16,813	22,708
Due after five years	341	340
Fair Value, Total	$ 28,586	$ 28,602

Losses and Loss Adjustment Reserve - Effects of Reinsurance on Premiums Written and Earned (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Written
Direct premiums	$ 113,167
Ceded premiums	(113,165)
Net premiums	2
Earned
Direct premiums	141,688
Ceded premiums	(141,686)
Net premiums	$ 2

Losses and Loss Adjustment Reserve - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017 USD ($) Reinsurer	Dec. 31, 2016 USD ($)
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Ceded rate of premiums under insurance program	100.00%
Premiums written net	$ 113,165,000
Ceded unpaid loss	39,200,000
Prepaid reinsurance premiums	280,140,000	$ 308,661,000
Increase (Decrease) in Loss and Loss Adjustment Expense Reserve	0
Reserve for losses and loss adjustment expense	$ 39,200,000
Number of reinsurers \| Reinsurer	2
Wright Flood
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Ceded rate of premiums under insurance program	100.00%
Expenses and allowance rate received in premiums	30.90%
Premiums written net	$ 112,800,000
Wright Flood \| 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%
Ceded amount	$ 300,000

Statutory Financial Information - Additional Information (Detail) - Wright Flood - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Statutory Accounting Practices [Line Items]
Statutory capital and surplus required	$ 7,500,000
Statutory capital and surplus	24,300,000	$ 23,500,000
Statutory net Income	$ 700,000	$ 8,200,000

Subsidiary Dividend Restrictions - Additional Information (Detail) - Wright Flood $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($)
Dividend Restrictions [Line Items]
Dividend rate as a percentage of net income	100.00%
Ordinary dividends payment description	The maximum amount of ordinary dividends that Wright Flood 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 Wright Flood’s last annual statement on file with the superintendent or 100% of adjusted net income.
Maximum dividend payout that may be made without prior approval	$ 8.2
Maximum
Dividend Restrictions [Line Items]
Dividend rate as a percentage of net income	10.00%

Shareholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Accelerated Share Repurchases [Line Items]
Shares repurchased, number of shares received initially (in shares)	8,003,000	8,003,000
Fair value of common stock repurchased	$ 257,683	$ 257,683
Repurchase Agreements [Member]
Accelerated Share Repurchases [Line Items]
Shares repurchased, authorized amount	$ 100,000

Basis of Financial Reporting Text Block (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Text Block [Abstract]
Share-based Compensation	$ 8,564	$ 2,772

Nature of Operations - Additional Information (Detail)	3 Months Ended
Nature of Operations - Additional Information (Detail)	Mar. 31, 2017 Segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments	4