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Basis of Presentation of Interim Period Statements - Additional Information (Detail) | 9 Months Ended |
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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 |

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