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Basis of Presentation of Interim Period Statements - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 01, 2016 | Jun. 30, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |  |
Revenue recognition professional employer services contracts term |  |  | 1 year |  |
Professional employer service contract cancellation and termination period |  |  | 30 days |  |
Cash and cash equivalents, maturity term |  |  | 3 months |  |
Trading marketable securities |  | $ 0 | $ 0 |  | $ 0
Allowance for doubtful accounts |  | 258,000 | 258,000 |  | 268,000
Settlement amount of workers' compensation liability costs with third party |  | 9,500,000 |  |  |
Quarterly payment due for settlement of workers' compensation liability costs with third party | $ 593,250 |  |  |  |
Estimate of liability for unpaid safety incentives |  | $ 24,300,000 | 24,300,000 |  | $ 21,300,000
Income taxes received |  |  | $ 1,200,000 | $ 1,100,000 |
Minimum [Member] |  |  |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |  |
Restricted marketable securities maturity period |  |  | 180 days |  |
Maximum [Member] |  |  |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |  |
Restricted marketable securities maturity period |  |  | 2 years |  |

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