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v2.4.1.9

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 |  |  |  |  |  |  |  |  | 4 us-gaap_NumberOfReportableSegments |  |
Total revenues | $ 393,020 us-gaap_Revenues | $ 421,418 us-gaap_Revenues | $ 397,764 us-gaap_Revenues | $ 363,594 us-gaap_Revenues | $ 343,165 us-gaap_Revenues | $ 359,310 us-gaap_Revenues | $ 325,792 us-gaap_Revenues | $ 335,012 us-gaap_Revenues | $ 1,575,796 us-gaap_Revenues | $ 1,363,279 us-gaap_Revenues | $ 1,200,032 us-gaap_Revenues
London, Bermuda and Cayman Islands [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 13,300 us-gaap_Revenues / dei_EntityByLocationAxis = bro_LondonBermudaAndCaymanIslandsOperationsMember | $ 12,200 us-gaap_Revenues / dei_EntityByLocationAxis = bro_LondonBermudaAndCaymanIslandsOperationsMember | $ 9,700 us-gaap_Revenues / dei_EntityByLocationAxis = bro_LondonBermudaAndCaymanIslandsOperationsMember

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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 + Details
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