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Workers' Compensation Claims - Additional Information (Detail) - USD ($)
 6 Months Ended 12 Months Ended 42 Months Ended
Jul. 01, 2021
Jun. 29, 2020
Jun. 30, 2020
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2022
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Description of renewed agreement           Effective July 1, 2021, the Company entered into a fully insured arrangement for its insured program, whereby third-party insurers assume substantially all risk of loss for claims incurred under the program. This fully insured arrangement has been extended annually and covers claims incurred between July 1, 2021 and June 30, 2025, with an option to renew through June 30, 2026.Each annual fully insured policy allows BBSI to participate in savings if claims develop favorably up to a maximum per policy year ranging from $20.5 million to $28.5 million, depending on the policy period. For only the policy period from July 1, 2021 to June 30 2022, BBSI can also incur additional premium up to $7.5 million if claims develop adversely. No additional premium can be charged based on claim performance for other policy years. Premiums incurred but not paid are recorded as either current or long-term premium payable on the consolidated balance sheets based on the expected timing of the payments.    
Workers' Compensation Liability       $ 128,446,000 $ 167,763,000 $ 128,446,000 $ 215,987,000 $ 279,407,000
Maximum additional premium charged amount for twelve month policy period, if claims develop adversely       0        
Balance in Chubb trust accounts       197,100,000 210,900,000 197,100,000    
Workers compensation liability       128,446,000 167,763,000 128,446,000 $ 215,987,000 $ 279,407,000
Workers compensation liability, current       39,081,000 50,006,000 39,081,000    
Collateral securities maintain to cover potential workers compensation claims losses       55,900,000 48,100,000 55,900,000    
Surety bonds and standby letters of credit       55,900,000   55,900,000    
Reserves and IBNR in excess of retention limits incurred but not reported       6,000,000 6,000,000      
2021-2022 Policy [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Maximum additional premium charged amount for twelve month policy period, if claims develop adversely       7,500,000        
2021-2022 Policy [Member] | Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Maximum savings amount for twelve month policy period, if claims develop favorably       28,500,000        
2021-2022 Policy [Member] | Minimum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Maximum savings amount for twelve month policy period, if claims develop favorably       20,500,000        
2022-2023 Policy [Member] | Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Maximum savings amount for twelve month policy period, if claims develop favorably       28,500,000        
2022-2023 Policy [Member] | Minimum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Maximum savings amount for twelve month policy period, if claims develop favorably       20,500,000        
2023-2024 Policy [Member] | Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Maximum savings amount for twelve month policy period, if claims develop favorably       28,500,000        
2023-2024 Policy [Member] | Minimum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Maximum savings amount for twelve month policy period, if claims develop favorably       20,500,000        
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       $ 6,000,000 $ 6,000,000 6,000,000    
Self Insured Programs [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Percentage of worker's compensation exposure covered       15.00%        
Worker's compensation risk claim maximum     $ 5,000,000 $ 3,000,000        
Self Insured Programs [Member] | Maryland [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Reinsurance coverage     1,000,000 1,000,000   1,000,000    
Self Insured Programs [Member] | Colorado [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Reinsurance coverage     $ 2,000,000 $ 2,000,000   $ 2,000,000    
Insured Program [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Percentage of worker's compensation exposure covered       85.00%        
Worker's compensation risk claim maximum $ 3,000,000              
Worker's compensation risk claim maximum   $ 5,000,000