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Summary of Operations and Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
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Dec. 31, 2020 USD ($) Branch Segment Company | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |
Number Of Branch Offices | Branch | 56 |  |  |
Number of operating segment | Segment | 1 |  |  |
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 | $ 757,000 | $ 888,000 | $ 533,000 | $ 265,000
Number of reporting units | Segment | 1 |  |  |
Goodwill and intangible assets impairment | $ 0 |  |  |
Estimate of liability for unpaid safety incentives | 18,800,000 | 28,000,000.0 |  |
One-time customer Incentive | 0 | 2,400,000 | 9,800,000 |
Income taxes paid | $ 8,500,000 | $ 15,400,000 | $ 1,800,000 |
Minimum [Member] |  |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |
Likelihood of tax benefit being realized upon settlement | 50.00% |  |  |
California [Member] | Revenue [Member] | Geographic Concentration Risk [Member] |  |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |
Percentage of revenue attributable to geographic area | 75.00% | 77.00% | 79.00% |

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