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Income Taxes - Summary of Effective Tax Rate for Continuing Operations Differed from U.S. Statutory Federal Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Statutory federal tax rate	(35.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State taxes, net of federal benefit	0.20%bbsi_EffectiveIncomeTaxRateReconciliationStateTaxesNetOfFederalBenefit	3.40%bbsi_EffectiveIncomeTaxRateReconciliationStateTaxesNetOfFederalBenefit	0.40%bbsi_EffectiveIncomeTaxRateReconciliationStateTaxesNetOfFederalBenefit
Valuation allowance on capital loss carryforward and state tax credit carryforward	(0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	(0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	2.30%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Adjustment for final positions on filed returns	(0.70%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	(1.50%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	(0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Nondeductible expenses and other, net	2.20%bbsi_EffectiveIncomeTaxRateReconciliationNonDeductibleExpensesAndOtherNet	0.80%bbsi_EffectiveIncomeTaxRateReconciliationNonDeductibleExpensesAndOtherNet	4.40%bbsi_EffectiveIncomeTaxRateReconciliationNonDeductibleExpensesAndOtherNet
Federal tax-exempt interest income	(0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome	(0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome	(0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome
Federal and state tax credits	(6.60%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits	(8.90%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits	(8.90%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
Total	(40.30%)us-gaap_EffectiveIncomeTaxRateContinuingOperations	28.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations	32.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations

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Effective income tax rate reconciliation non deductible expenses and other net.

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Effective income tax rate reconciliation state taxes net of federal benefit.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB

-Name Accounting Standards Codification

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes.

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