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Workers' Compensation Claims - Additional Information (Detail) - USD ($)
 6 Months Ended 9 Months Ended 12 Months Ended 39 Months Ended
Jul. 01, 2021
Jun. 29, 2020
Jun. 30, 2020
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
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.        
Maximum additional premium charged amount for twelve month policy period, if claims develop adversely       $ 0            
Balance in Chubb trust accounts       189,300,000 $ 210,900,000 $ 189,300,000        
Workers compensation liability       136,803,000 167,763,000 136,803,000 $ 149,630,000 $ 177,802,000 $ 191,823,000 $ 215,987,000
Collateral securities maintain to cover potential workers compensation claims losses       53,900,000 48,100,000 53,900,000        
Surety bonds and standby letters of credit       53,900,000   53,900,000        
Reserves and IBNR in excess of retention limits incurred but not reported       5,800,000 6,000,000.0          
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       $ 5,800,000 $ 6,000,000 5,800,000        
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     $ 5,000,000.0 $ 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   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   $ 2,000,000.0        
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