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Fair Value Measurement - Summary of Investments Measured at Fair Value on Recurring Basis (Parenthetical) (Detail) $ in Millions	Dec. 31, 2017 USD ($)
Fair Value Disclosures [Abstract]
Restricted cash and long term workers' compensation deposits	$ 6.3

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- Definition

Restricted cash and long term workers compensation deposits.

+ References

No definition available.

+ Details

Name:	bbsi_RestrictedCashAndLongTermWorkersCompensationDeposits
Namespace Prefix:	bbsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_FairValueDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration