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Segment Information - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 Segment | Mar. 31, 2014
Segment Reporting Information [Line Items] |  |
Number of reportable segments | 4us-gaap_NumberOfReportableSegments |
Total revenues | $ 404,298us-gaap_Revenues | $ 363,594us-gaap_Revenues
London, Bermuda and Cayman Islands |  |
Segment Reporting Information [Line Items] |  |
Total revenues | $ 2,700us-gaap_Revenues / dei_EntityByLocationAxis = bro_LondonBermudaAndCaymanIslandsOperationsMember | $ 2,400us-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. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_EntityByLocationAxis=bro_LondonBermudaAndCaymanIslandsOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |