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Income Taxes - Summary of Deferred Income Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Gross deferred income tax assets:    
Workers' compensation claims liabilities $ 12,168bbsi_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWorkersCompensationClaims $ 6,985bbsi_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWorkersCompensationClaims
Safety incentives payable 3,782bbsi_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSafetyIncentivesPayable 3,529bbsi_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSafetyIncentivesPayable
Allowance for doubtful accounts 118us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 94us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Tax effect of unrealized losses, net 856bbsi_DeferredTaxAssetsTaxEffectOfUnrealizedLossesNet 959bbsi_DeferredTaxAssetsTaxEffectOfUnrealizedLossesNet
Alternative minimum tax credit carryforward 1,840us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 0us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
State credit carryforward 969us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther 805us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther
State loss carryforward 568us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 0us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Workers' opportunity tax credit and EZ credit carryforward 3,162us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness 0us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness
Other 605us-gaap_DeferredTaxAssetsOther 504us-gaap_DeferredTaxAssetsOther
Deferred tax assets, gross total 24,068us-gaap_DeferredTaxAssetsGross 12,876us-gaap_DeferredTaxAssetsGross
Less valuation allowance 1,078us-gaap_DeferredTaxAssetsValuationAllowance 1,763us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets, net total 22,990us-gaap_DeferredTaxAssetsNet 11,113us-gaap_DeferredTaxAssetsNet
Gross deferred income tax liabilities:    
Tax depreciation in excess of book depreciation (3,770)bbsi_DeferredTaxLiabilitiesTaxDepreciationInExcessOfBookDepreciation (2,793)bbsi_DeferredTaxLiabilitiesTaxDepreciationInExcessOfBookDepreciation
Tax amortization of goodwill (11,588)bbsi_DeferredTaxLiabilitiesTaxAmortizationOfGoodwill (10,178)bbsi_DeferredTaxLiabilitiesTaxAmortizationOfGoodwill
Deferred Tax Liabilities, gross total (15,358)us-gaap_DeferredIncomeTaxLiabilities (12,971)us-gaap_DeferredIncomeTaxLiabilities
Net deferred income tax assets (liabilities) $ 7,632us-gaap_DeferredTaxAssetsLiabilitiesNet $ (1,858)us-gaap_DeferredTaxAssetsLiabilitiesNet