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Summary of Operations and Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 Segment Unit | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 01, 2010
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |
Restricted capital | $ 58,533,000 bbsi_RestrictedMarketableSecuritiesAndWorkersCompensationDeposits | $ 11,205,000 bbsi_RestrictedMarketableSecuritiesAndWorkersCompensationDeposits |  |
Operating and reporting segment | 1 bbsi_OperatingAndReportingSegment |  |  |
Revenue recognition professional employer services contracts term | 1 year |  |  |
Professional employer service contract cancellation and termination period | 30 days |  |  |
Cash and cash equivalents, maturity term | 3 months |  |  |
Number of reporting unit | 1 bbsi_NumberOfReportingUnit |  |  |
Goodwill and intangible assets impairment | 0 us-gaap_GoodwillAndIntangibleAssetImpairment |  |  |
Income taxes paid | 3,300,000 us-gaap_IncomeTaxesPaidNet | 9,000,000 us-gaap_IncomeTaxesPaidNet | 3,300,000 us-gaap_IncomeTaxesPaidNet |
Anti-dilutive common shares excluded from calculation of diluted loss per share | 227,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  |  |
California [Member] |  |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |
Revenue from attributable to geographic area | 77.00%bbsi_EntityWideRevenueByMajorGeographicAreaPercentage / us-gaap_StatementGeographicalAxis = stpr_CA | 74.00%bbsi_EntityWideRevenueByMajorGeographicAreaPercentage / us-gaap_StatementGeographicalAxis = stpr_CA | 69.00%bbsi_EntityWideRevenueByMajorGeographicAreaPercentage / us-gaap_StatementGeographicalAxis = stpr_CA |
Ecole Insurance Company [Member] |  |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |
Restricted capital |  |  |  | 6,100,000 bbsi_RestrictedMarketableSecuritiesAndWorkersCompensationDeposits / dei_LegalEntityAxis = bbsi_EcoleInsuranceCompanyMember
Minimum [Member] |  |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |
Restricted marketable securities maturity period | 180 days | 180 days |  |
Likelihood of tax benefit being realized upon settlement | 50.00%bbsi_LikelihoodOfTaxBenefitBeingRealizedUponSettlementPercent / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Minimum [Member] | AICE [Member] |  |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |
Workers Compensation Coverage Per Occurrence | 1,000,000 bbsi_WorkersCompensationCoveragePerOccurrence / dei_LegalEntityAxis = bbsi_AssociatedInsuranceCompanyExcessMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Maximum [Member] |  |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |
Restricted marketable securities maturity period | 2 years | 2 years |  |
Maximum [Member] | AICE [Member] |  |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |
Workers Compensation Coverage Per Occurrence | $ 5,000,000 bbsi_WorkersCompensationCoveragePerOccurrence / dei_LegalEntityAxis = bbsi_AssociatedInsuranceCompanyExcessMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |

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