Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net (loss) income	$ (27,084)us-gaap_NetIncomeLoss	$ 17,892us-gaap_NetIncomeLoss	$ 13,131us-gaap_NetIncomeLoss
Reconciliations of net (loss) income to net cash provided by operating activities:
Depreciation and amortization	2,506us-gaap_DepreciationAndAmortization	2,037us-gaap_DepreciationAndAmortization	1,477us-gaap_DepreciationAndAmortization
Losses (gains) recognized on marketable securities	3us-gaap_MarketableSecuritiesGainLoss	(1)us-gaap_MarketableSecuritiesGainLoss	(4)us-gaap_MarketableSecuritiesGainLoss
Gain recognized on sale and leaseback	0	(60)	(122)
Deferred income taxes	(9,487)	(632)	301
Share based compensation	1,699us-gaap_ShareBasedCompensation	1,016us-gaap_ShareBasedCompensation	695us-gaap_ShareBasedCompensation
Excess tax benefit from share-based compensation	(578)	(2,083)	(295)
Changes in certain assets and liabilities:
Trade accounts receivable, net	(17,041)	(21,665)	(17,401)
Income taxes receivable	(11,421)	0	4,133
Prepaid expenses and other	(387)	1,828	1,043
Accounts payable	(533)	1,257	356
Accrued payroll, payroll taxes and related benefits	27,617	22,948	17,228
Other accrued liabilities	1,604	7	6
Income taxes payable	(658)	3,047	567
Workers' compensation claims liabilities	103,538	41,880	20,663
Safety incentives liability	1,146bbsi_SafetyIncentiveLiability	3,244bbsi_SafetyIncentiveLiability	3,521bbsi_SafetyIncentiveLiability
Customer deposits, long-term liabilities and other assets, net	(1,328)	(519)	358
Net cash provided by operating activities	69,596	70,196	45,657
Cash flows from investing activities:
Purchase of property and equipment	(4,632)	(4,097)	(3,712)
Proceeds from sales and maturities of marketable securities	13,241	60,850	39,190
Purchase of marketable securities	(38,434)	(59,917)	(33,539)
Proceeds from maturities of restricted certificates of deposit	0	63,944	0
Purchase of restricted certificates of deposit	(101,546)	(76,733)	0
Proceeds from maturities of restricted marketable securities	10,524	9,918	10,796
Purchase of restricted marketable securities	(61,628)	(11,397)	(10,599)
Net cash (used in) provided by investing activities	(182,475)	(17,432)	2,136
Cash flows from financing activities:
Proceeds from credit-line borrowings	6,242us-gaap_ProceedsFromLinesOfCredit	132,664us-gaap_ProceedsFromLinesOfCredit	50,229us-gaap_ProceedsFromLinesOfCredit
Payments on credit-line borrowings	(6,242)us-gaap_RepaymentsOfLinesOfCredit	(137,196)us-gaap_RepaymentsOfLinesOfCredit	(45,697)us-gaap_RepaymentsOfLinesOfCredit
Proceeds from the issuance of long-term debt	40,000	0	5,512
Commitment fee from the issuance of long-term debt	(400)us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts
Payments on long-term debt	(220)us-gaap_RepaymentsOfLongTermDebt	(220)us-gaap_RepaymentsOfLongTermDebt	(19)us-gaap_RepaymentsOfLongTermDebt
Repurchase of common stock	(3,676)	0	(25,432)
Common stock repurchased on vesting of restricted stock units	(407)	(89)	0
Redemption of mandatorily redeemable preferred stock	0	0	(34,800)
Dividends paid	(5,443)us-gaap_PaymentsOfDividends	(4,056)us-gaap_PaymentsOfDividends	(3,550)us-gaap_PaymentsOfDividends
Proceeds from the exercise of stock options and vesting of restricted stock units	434us-gaap_ProceedsFromStockPlans	1,860us-gaap_ProceedsFromStockPlans	1,845us-gaap_ProceedsFromStockPlans
Excess tax benefit from share-based compensation	578	2,083	295
Net cash provided by (used in) financing activities	30,866	(4,954)	(51,617)
Net (decrease) increase in cash and cash equivalents	(82,013)	47,810	(3,824)
Cash and cash equivalents, beginning of year	93,557	45,747	49,571
Cash and cash equivalents, end of year	11,544	93,557	45,747
Mandatorily redeemable preferred stock [Member]
Supplemental schedule of noncash financing activities:
Issuance of mandatorily redeemable preferred stock	$ 0	$ 0	$ 34,800

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