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

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- Details

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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

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Period Type:	duration