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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
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Gross deferred income tax assets: |  |
Workers' compensation claims liabilities | $ 12,168 bbsi_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWorkersCompensationClaims | $ 6,985 bbsi_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWorkersCompensationClaims
Safety incentives payable | 3,782 bbsi_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSafetyIncentivesPayable | 3,529 bbsi_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSafetyIncentivesPayable
Allowance for doubtful accounts | 118 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts | 94 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Tax effect of unrealized losses, net | 856 bbsi_DeferredTaxAssetsTaxEffectOfUnrealizedLossesNet | 959 bbsi_DeferredTaxAssetsTaxEffectOfUnrealizedLossesNet
Alternative minimum tax credit carryforward | 1,840 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax | 0 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
State credit carryforward | 969 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther | 805 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther
State loss carryforward | 568 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal | 0 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Workers' opportunity tax credit and EZ credit carryforward | 3,162 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness | 0 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness
Other | 605 us-gaap_DeferredTaxAssetsOther | 504 us-gaap_DeferredTaxAssetsOther
Deferred tax assets, gross total | 24,068 us-gaap_DeferredTaxAssetsGross | 12,876 us-gaap_DeferredTaxAssetsGross
Less valuation allowance | 1,078 us-gaap_DeferredTaxAssetsValuationAllowance | 1,763 us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets, net total | 22,990 us-gaap_DeferredTaxAssetsNet | 11,113 us-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) | $ 7,632 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ (1,858)us-gaap_DeferredTaxAssetsLiabilitiesNet

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