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Workers' Compensation Claims - Summarizes Aggregate Workers' Compensation Reserve Activity (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Workers Compensation Reserve [Abstract]        
Workers' compensation claims liabilities, Beginning balance   $ 112,444us-gaap_WorkersCompensationLiabilityCurrentAndNoncurrent $ 70,564us-gaap_WorkersCompensationLiabilityCurrentAndNoncurrent $ 51,193us-gaap_WorkersCompensationLiabilityCurrentAndNoncurrent
Claims expense accrual:        
Current year   97,883bbsi_WorkersCompensationExpenseAccrualClaimsForCurrentPeriod 63,822bbsi_WorkersCompensationExpenseAccrualClaimsForCurrentPeriod 38,386bbsi_WorkersCompensationExpenseAccrualClaimsForCurrentPeriod
Prior years 61,300bbsi_WorkersCompensationExpenseAccrualClaimsForPriorPeriods 67,101bbsi_WorkersCompensationExpenseAccrualClaimsForPriorPeriods 23,445bbsi_WorkersCompensationExpenseAccrualClaimsForPriorPeriods 12,344bbsi_WorkersCompensationExpenseAccrualClaimsForPriorPeriods
Total expense accrual 101,200bbsi_WorkersCompensationExpenseAccrualClaims 164,984bbsi_WorkersCompensationExpenseAccrualClaims 87,267bbsi_WorkersCompensationExpenseAccrualClaims 50,730bbsi_WorkersCompensationExpenseAccrualClaims
Claims payments related to:        
Current year   13,183bbsi_WorkersCompensationClaimPaymentsCurrentPeriod 10,586bbsi_WorkersCompensationClaimPaymentsCurrentPeriod 6,746bbsi_WorkersCompensationClaimPaymentsCurrentPeriod
Prior years   48,263bbsi_ClaimPaymentsPriorPeriod 34,801bbsi_ClaimPaymentsPriorPeriod 24,613bbsi_ClaimPaymentsPriorPeriod
Total paid   61,446bbsi_WorkersCompensationClaimPayments 45,387bbsi_WorkersCompensationClaimPayments 31,359bbsi_WorkersCompensationClaimPayments
Workers' compensation claims liabilities, Ending balance   215,982us-gaap_WorkersCompensationLiabilityCurrentAndNoncurrent 112,444us-gaap_WorkersCompensationLiabilityCurrentAndNoncurrent 70,564us-gaap_WorkersCompensationLiabilityCurrentAndNoncurrent
Incurred but not reported (IBNR)   $ 113,984bbsi_WorkersCompensationIncurredButNotReported $ 69,611bbsi_WorkersCompensationIncurredButNotReported $ 47,992bbsi_WorkersCompensationIncurredButNotReported