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Summary of Operations and Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) Branch Segment Company | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |
Number Of Branch Offices | Branch | 58 |  |  |
Number of operating segment | Segment | 1 |  |  |
Revenue recognition professional employer services contracts term | 1 year |  |  |
Professional employer service contract cancellation and termination period | 30 days |  |  |
Number of wholly-owned insurance companies | Company | 2 |  |  |
Cash and cash equivalents, maturity term | 3 months |  |  |
Trading securities | $ 0 | $ 0 |  |
Allowance for doubtful accounts | $ 265,000 | 78,000 | $ 268,000 | $ 291,000
Number of reporting units | Segment | 1 |  |  |
Goodwill and intangible assets impairment | $ 0 |  |  |
Estimate of liability for unpaid safety incentives | 28,500,000 | 24,800,000 |  |
Income taxes paid (received) | 9,900,000 | 4,200,000 | $ (4,100,000) |
Deferred income taxes |  | $ 25,200,000 |  |
Restricted cash and investments | 70,600,000 |  |  |
Maximum [Member] | AICE [Member] |  |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |
Reinsurance coverage | $ 5,000,000 |  |  |
Minimum [Member] |  |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |
Likelihood of tax benefit being realized upon settlement | 50.00% |  |  |
Minimum [Member] | Chubb Limited [Member] |  |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |
Excess workers' compensation insurance coverage with Chubb | $ 5,000,000 |  |  |
California [Member] | Revenue [Member] | Geographic Concentration Risk [Member] |  |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |
Percentage of revenue attributable to geographic area | 79.00% | 78.00% | 78.00% |
Maryland [Member] | AICE [Member] |  |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |
Reinsurance coverage | $ 1,000,000 |  |  |
Maryland [Member] | Minimum [Member] | Chubb Limited [Member] |  |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |
Excess workers' compensation insurance coverage with Chubb | 1,000,000 |  |  |
Colorado [Member] | AICE [Member] |  |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |
Reinsurance coverage | $ 2,000,000 |  |  |
Colorado [Member] | Chubb Limited [Member] |  |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |
Excess workers' compensation insurance coverage with American Insurance Company | statutory limits |  |  |
Colorado [Member] | Minimum [Member] | Chubb Limited [Member] |  |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |
Excess workers' compensation insurance coverage with Chubb | $ 2,000,000 |  |  |

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