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Fair Value Measurement - Summary of Marketable Securities Consist of Investments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Recorded Basis | $ 20,930 us-gaap_MarketableSecuritiesNoncurrent | $ 5,909 us-gaap_MarketableSecuritiesNoncurrent
Recorded Basis | 29,957 us-gaap_MarketableSecuritiesCurrent | 19,787 us-gaap_MarketableSecuritiesCurrent
Current Available-for-Sale [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 30,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByAssetClassAxis = bbsi_CurrentAvailableForSaleMember | 19,800 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByAssetClassAxis = bbsi_CurrentAvailableForSaleMember
Gross Unrealized Gains (Losses) | (43)bbsi_MarketableSecuritiesUnrealizedHoldingGainLoss / us-gaap_FairValueByAssetClassAxis = bbsi_CurrentAvailableForSaleMember | (13)bbsi_MarketableSecuritiesUnrealizedHoldingGainLoss / us-gaap_FairValueByAssetClassAxis = bbsi_CurrentAvailableForSaleMember
Recorded Basis | 29,957 us-gaap_MarketableSecuritiesCurrent / us-gaap_FairValueByAssetClassAxis = bbsi_CurrentAvailableForSaleMember | 19,787 us-gaap_MarketableSecuritiesCurrent / us-gaap_FairValueByAssetClassAxis = bbsi_CurrentAvailableForSaleMember
Long-Term Available-for-Sale [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 20,940 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember | 5,953 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember
Gross Unrealized Gains (Losses) | (10)bbsi_MarketableSecuritiesUnrealizedHoldingGainLoss / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember | (44)bbsi_MarketableSecuritiesUnrealizedHoldingGainLoss / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember
Recorded Basis | 20,930 us-gaap_MarketableSecuritiesNoncurrent / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember | 5,909 us-gaap_MarketableSecuritiesNoncurrent / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember
Municipal Bonds [Member] | Long-Term Available-for-Sale [Member] | Level 2 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 3,843 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 4,074 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember
Gross Unrealized Gains (Losses) | 7 bbsi_MarketableSecuritiesUnrealizedHoldingGainLoss / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | (17)bbsi_MarketableSecuritiesUnrealizedHoldingGainLoss / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember
Recorded Basis | 3,850 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 4,057 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember
Corporate Bonds [Member] | Current Available-for-Sale [Member] | Level 2 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 0 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByAssetClassAxis = bbsi_CurrentAvailableForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember | 9,800 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByAssetClassAxis = bbsi_CurrentAvailableForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Gross Unrealized Gains (Losses) | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / us-gaap_FairValueByAssetClassAxis = bbsi_CurrentAvailableForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember | (13)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / us-gaap_FairValueByAssetClassAxis = bbsi_CurrentAvailableForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Recorded Basis | 0 us-gaap_MarketableSecuritiesCurrent / us-gaap_FairValueByAssetClassAxis = bbsi_CurrentAvailableForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember | 9,787 us-gaap_MarketableSecuritiesCurrent / us-gaap_FairValueByAssetClassAxis = bbsi_CurrentAvailableForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Corporate Bonds [Member] | Long-Term Available-for-Sale [Member] | Level 2 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 2,153 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember | 1,879 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Gross Unrealized Gains (Losses) | (3)bbsi_MarketableSecuritiesUnrealizedHoldingGainLoss / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember | (27)bbsi_MarketableSecuritiesUnrealizedHoldingGainLoss / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Recorded Basis | 2,150 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember | 1,852 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = bbsi_LongTermAvailableForSaleMember / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Variable Rate Demand Notes (VRDN) [Member] | Current Available-for-Sale [Member] | Level 2 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 21,670 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByAssetClassAxis = bbsi_CurrentAvailableForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_VariableRateDemandObligationMember | 10,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_FairValueByAssetClassAxis = bbsi_CurrentAvailableForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_VariableRateDemandObligationMember
Gross Unrealized Gains (Losses) | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / us-gaap_FairValueByAssetClassAxis = bbsi_CurrentAvailableForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_VariableRateDemandObligationMember | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / us-gaap_FairValueByAssetClassAxis = bbsi_CurrentAvailableForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_VariableRateDemandObligationMember
Recorded Basis | 21,670 us-gaap_MarketableSecuritiesCurrent / us-gaap_FairValueByAssetClassAxis = bbsi_CurrentAvailableForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_VariableRateDemandObligationMember | 10,000 us-gaap_MarketableSecuritiesCurrent / us-gaap_FairValueByAssetClassAxis = bbsi_CurrentAvailableForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_VariableRateDemandObligationMember
Certificate of Deposits [Member] | Level 2 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 14,944 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Gross Unrealized Gains (Losses) | (14)bbsi_MarketableSecuritiesUnrealizedHoldingGainLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 bbsi_MarketableSecuritiesUnrealizedHoldingGainLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Recorded Basis | 14,930 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Certificate of Deposits [Member] | Current Available-for-Sale [Member] | Level 2 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 8,330 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_FairValueByAssetClassAxis = bbsi_CurrentAvailableForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_FairValueByAssetClassAxis = bbsi_CurrentAvailableForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Gross Unrealized Gains (Losses) | (43)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_FairValueByAssetClassAxis = bbsi_CurrentAvailableForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_FairValueByAssetClassAxis = bbsi_CurrentAvailableForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Recorded Basis | $ 8,287 us-gaap_MarketableSecuritiesCurrent / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_FairValueByAssetClassAxis = bbsi_CurrentAvailableForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | $ 0 us-gaap_MarketableSecuritiesCurrent / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_FairValueByAssetClassAxis = bbsi_CurrentAvailableForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member

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- Definition Marketable securities unrealized holding gain loss. + References No definition available. + Details
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- Definition Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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- Definition Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 2 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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- Definition Total debt and equity financial instruments including: (1) securities held-to-maturity and (2) securities available-for-sale that will be held for the long-term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 + Details
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