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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

X

- 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