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Supplemental Disclosures of Cash Flow Information - Significant Non-Cash Investing and Financing Activities (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Supplemental Cash Flow Elements [Abstract]      
Other payable issued for purchased customer accounts $ 1,930bro_OtherPayables $ 1,425bro_OtherPayables $ 25,439bro_OtherPayables
Notes payable issued or assumed for purchased customer accounts     59us-gaap_NotesAssumed1
Estimated acquisition earn-out payables and related charges 33,229bro_RecordedEarnOutPayable 5,091bro_RecordedEarnOutPayable 21,479bro_RecordedEarnOutPayable
Notes received on the sale of fixed assets and customer accounts $ 6,340bro_NotesReceivableOnSaleOfFixedAssetsAndCustomerAccounts $ 1,108bro_NotesReceivableOnSaleOfFixedAssetsAndCustomerAccounts $ 967bro_NotesReceivableOnSaleOfFixedAssetsAndCustomerAccounts