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Basis of Presentation of Interim Period Statements - Additional Information (Detail) shares in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 USD ($) Company shares | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Abstract] |  |  |
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 | 73,000 |  | 78,000
Estimate of liability for unpaid safety incentives | 26,100,000 |  | 24,800,000
Income taxes paid (received) | $ 2,400,000 | $ (1,200,000) |
Anti-dilutive common shares excluded from calculation of diluted loss per share | shares | 294,169 |  |
Deferred income taxes |  |  | $ 25,200,000
Restricted cash and investments | $ 93,200,000 |  |

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