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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net loss	$ (5,802)us-gaap_NetIncomeLoss	$ (3,583)us-gaap_NetIncomeLoss
Reconciliations of net loss to net cash provided by operating activities:
Depreciation and amortization	683us-gaap_DepreciationAndAmortization	584us-gaap_DepreciationAndAmortization
Losses recognized on marketable securities	2us-gaap_MarketableSecuritiesGainLoss	1us-gaap_MarketableSecuritiesGainLoss
Deferred income taxes	56bbsi_DeferredIncomeTaxExpenseBenefitIncludingOtherComprehensiveIncomeTaxAdjustments	(409)bbsi_DeferredIncomeTaxExpenseBenefitIncludingOtherComprehensiveIncomeTaxAdjustments
Share-based compensation	545us-gaap_ShareBasedCompensation	331us-gaap_ShareBasedCompensation
Excess tax benefit from share-based compensation	(15)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	(15)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Changes in certain assets and liabilities:
Trade accounts receivable, net	(27,749)us-gaap_IncreaseDecreaseInAccountsReceivable	(10,370)us-gaap_IncreaseDecreaseInAccountsReceivable
Income taxes receivable	(2,150)us-gaap_IncreaseDecreaseInIncomeTaxesReceivable	(1,596)us-gaap_IncreaseDecreaseInIncomeTaxesReceivable
Prepaid expenses and other	(2,845)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	(1,595)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable	781us-gaap_IncreaseDecreaseInAccountsPayable	(870)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued payroll, payroll taxes and related benefits	34,375us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities	19,484us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Other accrued liabilities	(133)us-gaap_IncreaseDecreaseInOtherAccruedLiabilities	98us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
Income taxes payable	0us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable	(1,221)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Workers' compensation claims liabilities	6,283us-gaap_IncreaseDecreaseInWorkersCompensationLiabilities	7,691us-gaap_IncreaseDecreaseInWorkersCompensationLiabilities
Safety incentives liability	1,267bbsi_IncreaseDecreaseInSafetyIncentiveLiability	(894)bbsi_IncreaseDecreaseInSafetyIncentiveLiability
Customer deposits, long-term liabilities and other assets, net	205bbsi_IncreaseDecreaseInCustomerDepositsLongTermLiabilitiesAndOtherAssetsNet	74bbsi_IncreaseDecreaseInCustomerDepositsLongTermLiabilitiesAndOtherAssetsNet
Net cash provided by operating activities	5,503us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	7,710us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:
Purchase of property and equipment	(656)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment	(1,814)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sales and maturities of marketable securities	24,651us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities	2,934us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Purchase of marketable securities	(1,454)us-gaap_PaymentsToAcquireMarketableSecurities	(14,936)us-gaap_PaymentsToAcquireMarketableSecurities
Proceeds from maturities of restricted marketable securities	1,192us-gaap_ProceedsFromSaleOfRestrictedInvestments	1,010us-gaap_ProceedsFromSaleOfRestrictedInvestments
Purchase of restricted marketable securities	(29,932)us-gaap_PaymentsToAcquireRestrictedInvestments	(20,938)us-gaap_PaymentsToAcquireRestrictedInvestments
Net cash used in investing activities	(6,199)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	(33,744)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:
Proceeds from credit-line borrowings	28,251us-gaap_ProceedsFromLinesOfCredit	0us-gaap_ProceedsFromLinesOfCredit
Payments on credit-line borrowings	(22,479)us-gaap_RepaymentsOfLinesOfCredit	0us-gaap_RepaymentsOfLinesOfCredit
Payments on long-term debt	(55)us-gaap_RepaymentsOfLongTermDebt	(55)us-gaap_RepaymentsOfLongTermDebt
Dividends paid	(1,570)us-gaap_PaymentsOfDividends	(1,291)us-gaap_PaymentsOfDividends
Proceeds from exercise of stock options	195us-gaap_ProceedsFromStockPlans	76us-gaap_ProceedsFromStockPlans
Excess tax benefits from share-based compensation	15us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	15us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net cash provided by (used in) financing activities	4,357us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	(1,255)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase (decrease) in cash and cash equivalents	3,661us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	(27,289)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period	11,544us-gaap_CashAndCashEquivalentsAtCarryingValue	93,557us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period	$ 15,205us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 66,268us-gaap_CashAndCashEquivalentsAtCarryingValue

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