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Basis of Presentation of Interim Period Statements - Additional Information (Detail)
 9 Months Ended
Dec. 31, 2022
USD ($)
Sep. 30, 2023
USD ($)
Company
Sep. 30, 2022
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 $ 893,000 $ 885,000  
Estimate of liability for unpaid safety incentives 2,000,000.0 1,500,000  
Income taxes paid   $ 13,000,000 $ 12,200,000
Prior period reclassification adjustment $ 18,900,000   $ 10,000,000