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Fair Value Measurement - Summary of Restricted Marketable Securities Component and Workers' Compensation Deposits (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Long-Term Available-for-Sale [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	$ 20,940us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember	$ 5,953us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember
Long-Term Available-for-Sale [Member] | Municipal Bonds [Member] | Level 2 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	3,843us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember	4,074us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember
Long-Term Available-for-Sale [Member] | Corporate Bonds [Member] | Level 2 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	2,153us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember	1,879us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Restricted Marketable Securities [Member] | Long-Term Available-for-Sale [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	58,165us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember	10,378us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember
Gross Unrealized Gains (Losses)	18bbsi_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember	15bbsi_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember
Recorded Basis	58,183us-gaap_AvailableforsaleSecuritiesRestrictedNoncurrent / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember	10,393us-gaap_AvailableforsaleSecuritiesRestrictedNoncurrent / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember
Restricted Marketable Securities [Member] | Long-Term Available-for-Sale [Member] | Money Market Funds Held in Trust [Member] | Level 2 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	46,310us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember	0us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember
Gross Unrealized Gains (Losses)	0bbsi_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember	0bbsi_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember
Recorded Basis	46,310us-gaap_AvailableforsaleSecuritiesRestrictedNoncurrent / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember	0us-gaap_AvailableforsaleSecuritiesRestrictedNoncurrent / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember
Restricted Marketable Securities [Member] | Long-Term Available-for-Sale [Member] | Municipal Bonds [Member] | Level 2 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	4,352us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember	4,742us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember
Gross Unrealized Gains (Losses)	21bbsi_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember	10bbsi_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember
Recorded Basis	4,373us-gaap_AvailableforsaleSecuritiesRestrictedNoncurrent / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember	4,752us-gaap_AvailableforsaleSecuritiesRestrictedNoncurrent / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember
Restricted Marketable Securities [Member] | Long-Term Available-for-Sale [Member] | Corporate Bonds [Member] | Level 2 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	3,540us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember	2,849us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Gross Unrealized Gains (Losses)	(3)bbsi_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember	5bbsi_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Recorded Basis	3,537us-gaap_AvailableforsaleSecuritiesRestrictedNoncurrent / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember	2,854us-gaap_AvailableforsaleSecuritiesRestrictedNoncurrent / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Restricted Marketable Securities [Member] | Long-Term Available-for-Sale [Member] | U.S. Treasuries [Member] | Level 1 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	3,963us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember	2,787us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
Gross Unrealized Gains (Losses)	0bbsi_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember	0bbsi_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
Recorded Basis	3,963us-gaap_AvailableforsaleSecuritiesRestrictedNoncurrent / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember	2,787us-gaap_AvailableforsaleSecuritiesRestrictedNoncurrent / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
Restricted Marketable Securities [Member] | Current Available-for-Sale [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	3,776us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByMeasurementBasisAxis = bbsi_CurrentAvailableForSaleMember	0us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByMeasurementBasisAxis = bbsi_CurrentAvailableForSaleMember
Gross Unrealized Gains (Losses)	0bbsi_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByMeasurementBasisAxis = bbsi_CurrentAvailableForSaleMember	0bbsi_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByMeasurementBasisAxis = bbsi_CurrentAvailableForSaleMember
Recorded Basis	3,776us-gaap_AvailableforsaleSecuritiesRestrictedCurrent / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByMeasurementBasisAxis = bbsi_CurrentAvailableForSaleMember	0us-gaap_AvailableforsaleSecuritiesRestrictedCurrent / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByMeasurementBasisAxis = bbsi_CurrentAvailableForSaleMember
Restricted Marketable Securities [Member] | Current Available-for-Sale [Member] | Money Market Funds Held in Trust [Member] | Level 2 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	3,776us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_CurrentAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember	0us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_CurrentAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember
Gross Unrealized Gains (Losses)	0bbsi_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_CurrentAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember	0bbsi_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_CurrentAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember
Recorded Basis	$ 3,776us-gaap_AvailableforsaleSecuritiesRestrictedCurrent / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_CurrentAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember	$ 0us-gaap_AvailableforsaleSecuritiesRestrictedCurrent / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedMarketableSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_CurrentAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember

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Available for sale securities gross unrealized gain loss accumulated in investments.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Investments in debt and equity securities which are categorized neither as trading securities nor held-to-maturity securities, which are intended be sold or mature within one year from the balance sheet date or the normal operating cycle, whichever is longer, and that are pledged to one or more secured parties who have the right to buy, sell, or re-pledge the collateral.

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Investments in debt and equity securities which are categorized neither as trading securities nor held-to-maturity securities, which are intended be sold or mature greater than one year from the balance sheet date or the normal operating cycle, whichever is longer, and that are pledged to one or more secured parties who have the right to buy, sell, or re-pledge the collateral.

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