Basis of Presentation of Interim Period Statements - Additional Information (Detail) |
9 Months Ended | ||
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Sep. 30, 2020
USD ($)
Company
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Sep. 30, 2019
USD ($)
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Dec. 31, 2019
USD ($)
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| 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 | |
| X | ||||||||||
- Definition Cash and cash equivalents maximum maturity period. No definition available.
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| X | ||||||||||
- Definition Estimate of liability for unpaid safety incentives. No definition available.
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| X | ||||||||||
- Definition Number of wholly owned insurance companies. No definition available.
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| X | ||||||||||
- Definition Payment term for staffing customers. No definition available.
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| X | ||||||||||
- Definition Period for cancellation or termination of PEO service contract. No definition available.
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| X | ||||||||||
- Definition Revenue recognition PEO service contract minimum term. No definition available.
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| X | ||||||||||
- Definition Amount of allowance for credit loss on accounts receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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