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Stock-Based Compensation - Performance Stock Plan - Additional Information (Detail) (Performance Stock Plan [Member], USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2009
Jul. 31, 2009
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum number of shares available to be granted under PSP 14,400,000bro_MaximumNumberOfSharesAvailableToBeGrantedUnderAwardStockPlan          
Incremental increases in 20-trading-day average stock price 20.00%bro_IncrementalIncreasesInAverageStockPriceFromInitialGrantPrice          
Number of years of continuous employment 15 years          
Attainment age Attainment of age 64          
Grant of shares made under plan 5,549,882us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross     187,040us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross    
Initial stock prices, minimum $ 4.25us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit          
Initial stock prices, maximum $ 25.68us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit          
Shares not meeting first condition for vesting 25,418bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesNotYetAwardedOutstandingNumber 75,435bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesNotYetAwardedOutstandingNumber 1,296,517bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesNotYetAwardedOutstandingNumber     1,586,543bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesNotYetAwardedOutstandingNumber
Shares met the first condition for vesting and awarded 1,903,213bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedSharesOutstandingNumber 2,295,852bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedSharesOutstandingNumber 2,394,505bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedSharesOutstandingNumber     3,345,269bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedSharesOutstandingNumber
Shares distributed to the participants 3,455,604bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsDistributedSharesOutstandingNumber          
Total fair market value of PSP grants $ 8,362us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue $ 3,729us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue $ 23,034us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue      
Powell Brown [Member]
            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of years of continuous employment         20 years