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Basis of Presentation of Interim Period Statements - Additional Information (Detail)
 9 Months Ended
Sep. 30, 2022
USD ($)
Company
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Organization Consolidation And Presentation Of Financial Statements [Abstract]      
Revenue recognition professional employer service contracts term 1 year    
Professional employer service contract cancellation and termination period 30 days    
Payment term for staffing customers 30 days    
Number of wholly-owned insurance companies | Company 2    
Cash and cash equivalents, maturity term 3 months    
Allowance for doubtful accounts $ 700,000   $ 460,000
Estimate of liability for unpaid safety incentives 2,500,000   $ 4,300,000
Income taxes paid $ 12,200,000 $ 3,500,000