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Workers' Compensation Claims - Additional Information (Detail) - USD ($) |  |  | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 01, 2021 | Jun. 29, 2020 | Jun. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Description of renewed agreement |  |  |  | The Company entered into a new arrangement for its insured program effective July 1, 2021 whereby third-party insurers assume all risk of loss for claims incurred after June 30, 2021. The agreement continues to June 30, 2022 and includes a renewal commitment through June 30, 2023. The arrangement allows for premium adjustments depending on overall portfolio performance. If claims develop favorably, BBSI can participate in the savings up to $20.0 million for a twelve-month policy period. If claims develop adversely, additional premium may be charged up to $7.5 million for a twelve-month policy period. |  |  |
Maximum savings amount for twelve month policy period, if claims develop favorably |  |  |  | $ 20,000,000.0 |  |  |
Maximum additional premium charged amount for twelve month policy period, if claims develop adversely |  |  |  | 7,500,000 |  |  |
Balance in Chubb trust accounts |  | $ 115,700,000 |  | 273,600,000 | $ 290,700,000 |  |
Workers compensation liability |  |  |  | 279,407,000 | 357,746,000 | $ 438,986,000 | $ 413,397,000
Workers compensation liability, current |  |  |  | 80,028,000 | 102,040,000 |  |
Collateral securities maintain to cover potential workers compensation claims losses |  |  |  | 58,400,000 | 60,100,000 |  |
Surety bonds and standby letters of credit |  |  |  | 58,400,000 |  |  |
Reserves incurred in excess of retention limits |  |  |  | 2,200,000 | 2,900,000 |  |
Other Assets [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Accrual for costs incurred in excess of retention limits offset by a receivable |  |  |  | 2,200,000 | $ 2,900,000 |  |
California [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Surety bonds and standby letters of credit |  |  |  | $ 32,600,000 |  |  |
Insured Program [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of worker's compensation exposure covered |  |  |  | 82.00% |  |  |
Worker's compensation risk claim maximum | $ 3,000,000.0 |  |  |  |  |  |
Worker's compensation risk claim maximum |  | $ 5,000,000.0 |  |  |  |  |
Workers compensation liability |  |  |  | $ 53,100,000 |  |  |
Workers compensation liability, current |  |  |  | $ 5,000,000.0 |  |  |
Self Insured Programs [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of worker's compensation exposure covered |  |  |  | 18.00% |  |  |
Worker's compensation risk claim maximum |  |  | $ 5,000,000.0 | $ 3,000,000.0 |  |  |
Self Insured Programs [Member] | Maryland [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Reinsurance coverage |  |  | 1,000,000.0 | 1,000,000.0 |  |  |
Self Insured Programs [Member] | Colorado [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Reinsurance coverage |  |  | $ 2,000,000.0 | $ 2,000,000.0 |  |  |

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