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Summary of Significant Accounting Policies - Reconciliation between Basic and Diluted Weighted Average Shares Outstanding (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Net income	$ 24,395us-gaap_NetIncomeLoss	$ 68,331us-gaap_NetIncomeLoss	$ 61,755us-gaap_NetIncomeLoss	$ 52,415us-gaap_NetIncomeLoss	$ 47,225us-gaap_NetIncomeLoss	$ 57,749us-gaap_NetIncomeLoss	$ 52,007us-gaap_NetIncomeLoss	$ 60,131us-gaap_NetIncomeLoss	$ 206,896us-gaap_NetIncomeLoss	$ 217,112us-gaap_NetIncomeLoss	$ 184,045us-gaap_NetIncomeLoss
Net income attributable to unvested awarded performance stock									(5,186)bro_NetIncomeAttributableToUnvestedAwardedPerformanceStock	(5,446)bro_NetIncomeAttributableToUnvestedAwardedPerformanceStock	(5,313)bro_NetIncomeAttributableToUnvestedAwardedPerformanceStock
Net income attributable to common shares									$ 201,710us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 211,666us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 178,732us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted average basic number of common shares outstanding									144,568us-gaap_WeightedAverageNumberOfSharesIssuedBasic	144,662us-gaap_WeightedAverageNumberOfSharesIssuedBasic	143,507us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Less unvested awarded performance stock included in weighted average basic share outstanding									(3,624)us-gaap_IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights	(3,629)us-gaap_IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights	(4,143)us-gaap_IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights
Weighted average number of common shares outstanding for basic earnings per common share									140,944us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	141,033us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	139,364us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of stock options									1,947us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1,591us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2,646us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average number of shares outstanding									142,891us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	142,624us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	142,010us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic	$ 0.17us-gaap_EarningsPerShareBasic	$ 0.47us-gaap_EarningsPerShareBasic	$ 0.43us-gaap_EarningsPerShareBasic	$ 0.36us-gaap_EarningsPerShareBasic	$ 0.32us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic	$ 0.36us-gaap_EarningsPerShareBasic	$ 0.42us-gaap_EarningsPerShareBasic	$ 1.43us-gaap_EarningsPerShareBasic	$ 1.50us-gaap_EarningsPerShareBasic	$ 1.28us-gaap_EarningsPerShareBasic
Diluted	$ 0.17us-gaap_EarningsPerShareDiluted	$ 0.47us-gaap_EarningsPerShareDiluted	$ 0.42us-gaap_EarningsPerShareDiluted	$ 0.36us-gaap_EarningsPerShareDiluted	$ 0.32us-gaap_EarningsPerShareDiluted	$ 0.39us-gaap_EarningsPerShareDiluted	$ 0.36us-gaap_EarningsPerShareDiluted	$ 0.41us-gaap_EarningsPerShareDiluted	$ 1.41us-gaap_EarningsPerShareDiluted	$ 1.48us-gaap_EarningsPerShareDiluted	$ 1.26us-gaap_EarningsPerShareDiluted

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