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Workers' Compensation Claims - Additional Information (Detail) - USD ($) |  |  |  | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2022 | Jul. 01, 2021 | Jun. 29, 2020 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2020
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 assumed all risk of loss for claims incurred from July 1, 2021 to June 30, 2022 (the “2021-2022 Policy”). The 2021-2022 Policy allows for premium adjustments depending on overall policy performance. If claims develop favorably, BBSI can participate in the savings up to $20.0 million for the 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 | 198,600,000 |  | $ 273,600,000 |  |  |
Workers compensation liability |  |  |  | 227,343,000 | $ 296,999,000 | 279,407,000 | $ 241,510,000 | $ 315,733,000 | $ 357,746,000
Collateral securities maintain to cover potential workers compensation claims losses |  |  |  | 54,500,000 |  | 58,400,000 |  |  |
Surety bonds |  |  |  | 54,500,000 |  |  |  |  |
Reserves incurred in excess of retention limits |  |  |  | 3,000,000.0 |  | 2,200,000 |  |  |
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 |  |  |  | 3,000,000.0 |  | $ 2,200,000 |  |  |
California [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Surety bonds |  |  |  | $ 22,300,000 |  |  |  |  |
2022-2023 Policy [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Description of renewed agreement |  |  |  | Effective July 1, 2022, the Company renewed the arrangement for its insured program, which now continues to June 30, 2023 (the “2022-2023 Policy”). Under the renewed arrangement, the Company can participate in savings up to $22.5 million for the twelve-month policy period. For the 2022-2023 Policy, no additional premium may be charged if claims develop adversely. The 2022-2023 Policy includes a renewal commitment through June 30, 2024. |  |  |  |  |
Maximum savings amount for twelve month policy period, if claims develop favorably | $ 22,500,000 |  |  |  |  |  |  |  |
Maximum additional premium charged amount for twelve month policy period, if claims develop adversely | $ 0 |  |  |  |  |  |  |  |
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 |  |  |  |  |
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 |  |  |  | $ 3,000,000.0 | $ 5,000,000.0 |  |  |  |
Self Insured Programs [Member] | Maryland [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Reinsurance coverage |  |  |  | 1,000,000.0 |  |  |  |  |
Self Insured Programs [Member] | Colorado [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Reinsurance coverage |  |  |  | $ 2,000,000.0 |  |  |  |  |

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