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Segment Information - Additional Information (Detail) (USD $) In Thousands, 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 Segment	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Number of reportable segments									4us-gaap_NumberOfReportableSegments
Total revenues	$ 393,020us-gaap_Revenues	$ 421,418us-gaap_Revenues	$ 397,764us-gaap_Revenues	$ 363,594us-gaap_Revenues	$ 343,165us-gaap_Revenues	$ 359,310us-gaap_Revenues	$ 325,792us-gaap_Revenues	$ 335,012us-gaap_Revenues	$ 1,575,796us-gaap_Revenues	$ 1,363,279us-gaap_Revenues	$ 1,200,032us-gaap_Revenues
London, Bermuda and Cayman Islands [Member]
Segment Reporting Information [Line Items]
Total revenues									$ 13,300us-gaap_Revenues / dei_EntityByLocationAxis = bro_LondonBermudaAndCaymanIslandsOperationsMember	$ 12,200us-gaap_Revenues / dei_EntityByLocationAxis = bro_LondonBermudaAndCaymanIslandsOperationsMember	$ 9,700us-gaap_Revenues / dei_EntityByLocationAxis = bro_LondonBermudaAndCaymanIslandsOperationsMember

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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