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Stock Incentive Plans - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 Installment | Dec. 31, 2013 Installment | Dec. 31, 2012 Installment | Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |
Stock-based awards issued to outside consultants or advisors | 0 bbsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodToConsultantsAndAdvisors |  |  |
Number of shares of common stock reserved for issuance under the 2009 Plan | 1,000,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance |  |  |
Aggregate number of shares for which incentive stock options may be granted under the Plan | 900,000 bbsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantUnderStockIncentivePlan |  |  |
Option awards shares outstanding under the 2009 plan together with the 2003 Plan and its predecessor | 367,533 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 400,399 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 538,697 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 671,294 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Outstanding options expiration period from the date of grant | 10 years |  |  |
Number of equal annual installments options are exercisable | 4 bbsi_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingExercisableInNumberOfInstallments |  |  |
Options exercisable period after date of grant | 1 year |  |  |
New grants of stock options | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod | 44,970 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod | 47,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod |
Restricted stock units outstanding | 126,846 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber |  |  |
Options granted | 0 bbsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrossAtBelowMarketPrice | 0 bbsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrossAtBelowMarketPrice | 0 bbsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrossAtBelowMarketPrice |
Weighted average grant date fair value of restricted stock units, granted | $ 50.47 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 50.28 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 21.44 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue |
Number of equal annual installments in which restricted stock units vest | 4 bbsi_NumberOfEqualInstallmentInWhichRestrictedStockUnitsVest | 4 bbsi_NumberOfEqualInstallmentInWhichRestrictedStockUnitsVest | 4 bbsi_NumberOfEqualInstallmentInWhichRestrictedStockUnitsVest |
Annual installments for vesting of restricted stock beginning from date of grant, period | 1 year | 1 year | 1 year |
Unrecognized compensation expense related to stock options | $ 5.6 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |  |
Weighted average period | 3 years 1 month 24 days |  |  |

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant Under Stock Incentive Plan + References No definition available. + Details
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- Definition Share-based compensation arrangement by share-based payment award options grants in period gross at below market price. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award options grants in period to consultants and advisors. + References No definition available. + Details
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- Definition Aggregate number of common shares reserved for future issuance. + 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 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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