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Fair Value Measurement - Schedule of Long-Term Restricted Certificates of Deposit (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost	$ 114,335us-gaap_RestrictedCashAndInvestmentsNoncurrent	$ 114,335us-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	114,335us-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	$ 114,335us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bbsi_RestrictedCertificatesOfDepositMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member

X

- Definition

Certificates Of Deposit Gross Unrealized Gain

+ References

No definition available.

+ Details

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X

- 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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- Details

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X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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X

- Details

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