v3.4.0.3
Document and Entity Information - USD ($)
3 Months Ended
Mar. 31, 2016
May. 03, 2016
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2016  
Document Fiscal Year Focus 2016  
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   140,022,014
Entity Public Float $ 111,111,111