Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation of Interim Period Statements - Additional Information (Detail)

v3.20.2
Basis of Presentation of Interim Period Statements - Additional Information (Detail)
9 Months Ended
Sep. 30, 2020
USD ($)
Company
Sep. 30, 2019
USD ($)
Dec. 31, 2019
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 $ 784,000   $ 888,000
Estimate of liability for unpaid safety incentives 23,400,000   $ 28,000,000.0
Income taxes paid $ 3,200,000 $ 10,100,000