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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
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Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | $ 114,335 us-gaap_RestrictedCashAndInvestmentsNoncurrent | $ 12,789 us-gaap_RestrictedCashAndInvestmentsNoncurrent
Restricted Certificates of Deposit [Member] | Level 2 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 114,335 us-gaap_RestrictedCashAndInvestmentsNoncurrent / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedCertificatesOfDepositMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 12,789 us-gaap_RestrictedCashAndInvestmentsNoncurrent / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedCertificatesOfDepositMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Gross Unrealized Gains | 0 bbsi_CertificatesOfDepositGrossUnrealizedGain / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedCertificatesOfDepositMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 bbsi_CertificatesOfDepositGrossUnrealizedGain / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedCertificatesOfDepositMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Recorded Basis | $ 114,335 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedCertificatesOfDepositMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | $ 12,789 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedCertificatesOfDepositMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member

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- Definition Certificates Of Deposit Gross Unrealized Gain + References No definition available. + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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Namespace Prefix: | us-gaap_
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- Details
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- Definition The noncurrent cash, cash equivalents and investments that is restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits classified as long-term; that is not expected to be released from such existing restrictions within one year of the balance sheet date or operating cycle, whichever is longer. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes noncurrent cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Details
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