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Business Combinations - Additions, Payments, and Net Changes, as well as Interest Expense Accretion on Estimated Acquisition Earn-Out Payables (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Business Combinations [Abstract] |  |
Beginning balance | $ 75,283bro_BusinessAcquisitionEarnOutPayables | $ 43,058bro_BusinessAcquisitionEarnOutPayables
Additions to estimated acquisition earn-out payables | 5,653bro_AdditionsToEstimatedAcquisitionEarnOutPayables | 280bro_AdditionsToEstimatedAcquisitionEarnOutPayables
Payments for estimated acquisition earn-out payables | (4,590)bro_PaymentsForEstimatedAcquisitionEarnOutPayables | (615)bro_PaymentsForEstimatedAcquisitionEarnOutPayables
Subtotal | 76,346bro_BusinessAcquisitionEarnOutPayableAfterChangeInAdditionsAndPayments | 42,723bro_BusinessAcquisitionEarnOutPayableAfterChangeInAdditionsAndPayments
Net change in earnings from estimated acquisition earn-out payables: |  |
Change in fair value on estimated acquisition earn-out payables | (677)bro_ChangeInFairValueEstimatedAcquisitionEarnOutPayables | (5,603)bro_ChangeInFairValueEstimatedAcquisitionEarnOutPayables
Interest expense accretion | 686us-gaap_AssetRetirementObligationAccretionExpense | 480us-gaap_AssetRetirementObligationAccretionExpense
Net change in earnings from estimated acquisition earn-out payables | 1,363bro_ChangeInEstimatedAcquisitionEarnOutPayable | 6,083bro_ChangeInEstimatedAcquisitionEarnOutPayable
Ending balance | $ 77,709bro_BusinessAcquisitionEarnOutPayables | $ 48,806bro_BusinessAcquisitionEarnOutPayables

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- Definition Business Acquisition Earn Out Payable After Change In Additions And Payments + References No definition available. + Details
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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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