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Benefit Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Compensation And Retirement Disclosure [Abstract]
Discretionary Company contributions	$ 0	$ 0	$ 0
Employer matching contribution	1,800,000	1,900,000	$ 1,600,000
Long term portion of deferred compensation plan liability	4,900,000	3,500,000
Current portion of deferred compensation plan liability	100,000	0
Fair value of long term portion of deferred compensation plan liability	4,900,000	3,500,000
Fair value of current portion of deferred compensation plan liability	$ 100,000	$ 0

X

- Definition

Deferred compensation liability fair value classified current

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Deferred compensation liability fair value classified noncurrent.

+ References

No definition available.

+ Details

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Namespace Prefix:	bbsi_
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X

- Definition

Defined contribution plan employer matching contribution amount.

+ References

No definition available.

+ Details

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Namespace Prefix:	bbsi_
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Balance Type:	debit
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- References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

+ References

No definition available.

+ Details

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X

- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable within one year (or the operating cycle, if longer). Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 25
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=6409733&loc=d3e19512-108361

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20028-108363

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X

- Definition

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

+ References

No definition available.

+ Details

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