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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 0bbsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodToConsultantsAndAdvisors      
Number of shares of common stock reserved for issuance under the 2009 Plan 1,000,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance      
Aggregate number of shares for which incentive stock options may be granted under the Plan 900,000bbsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantUnderStockIncentivePlan      
Option awards shares outstanding under the 2009 plan together with the 2003 Plan and its predecessor 367,533us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 400,399us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 538,697us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 671,294us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Outstanding options expiration period from the date of grant 10 years      
Number of equal annual installments options are exercisable 4bbsi_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingExercisableInNumberOfInstallments      
Options exercisable period after date of grant 1 year      
New grants of stock options 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 44,970us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 47,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod  
Restricted stock units outstanding 126,846us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber      
Options granted 0bbsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrossAtBelowMarketPrice 0bbsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrossAtBelowMarketPrice 0bbsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrossAtBelowMarketPrice  
Weighted average grant date fair value of restricted stock units, granted $ 50.47us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 50.28us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 21.44us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue  
Number of equal annual installments in which restricted stock units vest 4bbsi_NumberOfEqualInstallmentInWhichRestrictedStockUnitsVest 4bbsi_NumberOfEqualInstallmentInWhichRestrictedStockUnitsVest 4bbsi_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 $ 5.6us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized      
Weighted average period 3 years 1 month 24 days