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401(k) Savings Plan - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014 Age H	Dec. 31, 2013	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Age to participate in the savings plan	21bbsi_AgeToParticipateInSavingsPlan
Time to participate in the savings plan	1,000bbsi_TimeToParticipateInSavingsPlan
Consecutive period to participate in the savings plan	12 months
Discretionary Company contributions	$ 0us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount	$ 0us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount	$ 0us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Contributions by management	100.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Percentage of each participating employee annual compensation	3.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Employee's contributions	50.00%bbsi_DefinedContributionEmployeeContributionPercent
Additional annual compensation	2.00%bbsi_EmployeeContributionPortionOfAnnualCompensation
Matching contributions	$ 885,000bbsi_DefinedContributionPlanEmployerMatchingContributionAmount	$ 734,000bbsi_DefinedContributionPlanEmployerMatchingContributionAmount	$ 610,000bbsi_DefinedContributionPlanEmployerMatchingContributionAmount

X

- Definition

Age to participate in the savings plan.

+ References

No definition available.

+ Details

Name:	bbsi_AgeToParticipateInSavingsPlan
Namespace Prefix:	bbsi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Consecutive period of service following initial date of employment for saving plan valuation.

+ References

No definition available.

+ Details

Name:	bbsi_ConsecutivePeriodOfServiceFollowingInitialDateOfEmploymentForSavingPlanValuation
Namespace Prefix:	bbsi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Defined contribution employee contribution percent.

+ References

No definition available.

+ Details

Name:	bbsi_DefinedContributionEmployeeContributionPercent
Namespace Prefix:	bbsi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Defined contribution plan employer matching contribution amount.

+ References

No definition available.

+ Details

Name:	bbsi_DefinedContributionPlanEmployerMatchingContributionAmount
Namespace Prefix:	bbsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Employee contribution portion of annual compensation.

+ References

No definition available.

+ Details

Name:	bbsi_EmployeeContributionPortionOfAnnualCompensation
Namespace Prefix:	bbsi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Time to participate in the savings plan.

+ References

No definition available.

+ Details

Name:	bbsi_TimeToParticipateInSavingsPlan
Namespace Prefix:	bbsi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration