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Workers' Compensation Claims - Summarizes Aggregate Workers' Compensation Reserve Activity (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Workers Compensation Reserve [Abstract] |  |  |
Workers' compensation claims liabilities, Beginning balance | $ 167,763 | $ 215,987 | $ 279,407
Add: claims expense accrual |  |  |
Current period | 12,188 | 16,731 | 19,146
Prior periods | (11,524) | (12,147) | (11,337)
Total claims expense incurred | 664 | 4,584 | 7,809
Less: claim payments related to |  |  |
Current period | 5,006 | 3,260 | 4,450
Prior periods | 35,008 | 52,570 | 67,581
Total claim payments | 40,014 | 55,830 | 72,031
Change in claims incurred in excess of retention limits | 33 | 3,022 | 802
Workers' compensation claims liabilities, Ending balance | $ 128,446 | $ 167,763 | $ 215,987

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- Definition Claim payments. + References No definition available. + Details
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- Definition Claim payments prior period. + References No definition available. + Details
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- Definition Claims expense accrual. + References No definition available. + Details
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- Definition Workers compensation change in claims incurred in excess of retention limits. + References No definition available. + Details
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- Definition Workers compensation claim payments. + References No definition available. + Details
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- Definition Workers compensation claim payments current period. + References No definition available. + Details
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- Definition Workers compensation expense accrual claims. + References No definition available. + Details
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- Definition Workers compensation expense accrual claims for current period. + References No definition available. + Details
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- Definition Workers compensation expense adjustments accrual claims for prior periods. + References No definition available. + Details
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Namespace Prefix: | bbsi_
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- Definition workers compensation reserve. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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