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Quarterly Operating Results (Unaudited) - Quarterly Operating Results (Parenthetical) (Detail) (Axiom [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Axiom [Member] |
Schedule Of Quarterly Financial Data [Line Items] |
Loss on disposal of sale of business | $ 47.4 us-gaap_GainLossOnSaleOfBusiness / us-gaap_TaxCreditCarryforwardAxis = bro_BusinessMember

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- Details
Name: | bro_ScheduleOfQuarterlyFinancialDataLineItems
Namespace Prefix: | bro_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment. + References No definition available. + Details
Name: | us-gaap_GainLossOnSaleOfBusiness
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration