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Income Taxes - Significant Components of Non-Current Deferred Tax Liabilities and Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Fixed assets $ 10,368us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment $ 11,651us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Net unrealized holding gain on available-for-sale securities 56bro_NetUnrealizedHoldingGainOfAvailableForSaleSecurities  
Intangible assets 364,938us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 306,009us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Total non-current deferred tax liabilities 375,362bro_NoncurrentDeferredTaxLiabilities 317,660bro_NoncurrentDeferredTaxLiabilities
Deferred compensation 31,580us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 22,598us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
Net operating loss carryforwards 2,796us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 3,843us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Valuation allowance for deferred tax assets (511)us-gaap_DeferredTaxAssetsValuationAllowance (485)us-gaap_DeferredTaxAssetsValuationAllowance
Total non-current deferred tax assets 33,865us-gaap_DeferredTaxAssetsNetNoncurrent 25,956us-gaap_DeferredTaxAssetsNetNoncurrent
Net non-current deferred tax liability $ 341,497us-gaap_DeferredTaxLiabilitiesNoncurrent $ 291,704us-gaap_DeferredTaxLiabilitiesNoncurrent