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Stock Repurchase - Additional Information (Detail) (USD $)
 0 Months Ended 12 Months Ended 0 Months Ended
Sep. 28, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 28, 2012
Sep. 21, 2012
Equity, Class of Treasury Stock [Line Items]            
Repurchase common stock held by promoter, one   87,200us-gaap_StockRepurchasedDuringPeriodShares 0us-gaap_StockRepurchasedDuringPeriodShares 0us-gaap_StockRepurchasedDuringPeriodShares    
Repurchase share price, per share   $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare   20us-gaap_CommonStockParOrStatedValuePerShare  
Total consideration         59,700,000us-gaap_StockRepurchaseProgramAuthorizedAmount1  
Stock repurchase in cash   3,676,000us-gaap_PaymentsForRepurchaseOfCommonStock 0us-gaap_PaymentsForRepurchaseOfCommonStock 25,432,000us-gaap_PaymentsForRepurchaseOfCommonStock    
Non-Voting Redeemable Preferred Stock with a liquidation preference   $ 1,000us-gaap_PreferredStockLiquidationPreference        
Professional and legal fees   514,000us-gaap_ProfessionalFees        
Redemption of outstanding shares of Series A Nonconvertible, Non-Voting Redeemable Preferred Stock           34,800,000us-gaap_PreferredStockRedemptionAmount
Decrease in dividend obligation after redemption of preferred stock 870,000us-gaap_OtherPreferredStockDividendsAndAdjustments          
Dividend rate on preferred stock paid semi-annually 5.00%us-gaap_PreferredStockDividendRatePercentage          
Preferred stock redemption period   6 months        
Series A Nonconvertible, Non-Voting Redeemable Preferred Stock [Member]            
Equity, Class of Treasury Stock [Line Items]            
Stock repurchase from issued shares   34,800us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= bbsi_SeriesNonconvertibleNonVotingRedeemablePreferredStockMember		        
Promoter One [Member]            
Equity, Class of Treasury Stock [Line Items]            
Repurchase common stock held by promoter, one         2,485,929us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= bbsi_PromoterOneMember		  
Promoter Two [Member]            
Equity, Class of Treasury Stock [Line Items]            
Repurchase common stock held by promoter, one         500,000us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= bbsi_PromoterTwoMember		  
Cash [Member]            
Equity, Class of Treasury Stock [Line Items]            
Stock repurchase in cash   $ 24,900,000us-gaap_PaymentsForRepurchaseOfCommonStock
/ us-gaap_InvestmentTypeAxis
= us-gaap_CashMember