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Subsequent Event - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Feb. 13, 2014 Subsequent Event [Member]
Subsequent Event [Line Items] |  |
Workers' compensation insurance arrangement effective date | Feb. 13, 2014 |
Worker's compensation risk, per claim |  | $ 5.0

X
- Definition Agreement Effective Date + References No definition available. + Details
Name: | bbsi_AgreementEffectiveDate
Namespace Prefix: | bbsi_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Workers Compensation Claims + References No definition available. + Details
Name: | bbsi_WorkersCompensationClaims
Namespace Prefix: | bbsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration