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Fair Value Measurement - Schedule of Long-Term Restricted Certificates of Deposit (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Cost $ 114,335us-gaap_RestrictedCashAndInvestmentsNoncurrent $ 12,789us-gaap_RestrictedCashAndInvestmentsNoncurrent
Restricted Certificates of Deposit [Member] | Level 2 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Cost 114,335us-gaap_RestrictedCashAndInvestmentsNoncurrent
/ us-gaap_FairValueByAssetClassAxis
= bbsi_RestrictedCertificatesOfDepositMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
12,789us-gaap_RestrictedCashAndInvestmentsNoncurrent
/ us-gaap_FairValueByAssetClassAxis
= bbsi_RestrictedCertificatesOfDepositMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Gross Unrealized Gains 0bbsi_CertificatesOfDepositGrossUnrealizedGain
/ us-gaap_FairValueByAssetClassAxis
= bbsi_RestrictedCertificatesOfDepositMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0bbsi_CertificatesOfDepositGrossUnrealizedGain
/ us-gaap_FairValueByAssetClassAxis
= bbsi_RestrictedCertificatesOfDepositMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Recorded Basis $ 114,335us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= bbsi_RestrictedCertificatesOfDepositMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
$ 12,789us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= bbsi_RestrictedCertificatesOfDepositMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member