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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