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Summary of Operations and Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2016 USD ($) Branch Segment | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |
Number Of Branch Offices | Branch | 57 |  |
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 securities | $ 0 | $ 0 |
Number of reporting units | Segment | 1 |  |
Goodwill and intangible assets impairment | $ 0 |  |
Estimate of liability for unpaid safety incentives | 24,800,000 | 21,300,000 |
Income taxes paid (received) | 4,200,000 | (4,100,000) | $ 3,300,000
Deferred income taxes | $ 25,242,000 | $ 20,941,000 |
Maximum [Member] |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |
Restricted cash and investments maturity period | 2 years |  |
Maximum [Member] | AICE [Member] |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |
Workers Compensation Coverage Per Occurrence | $ 5,000,000 |  |
Maximum [Member] | Chubb Limited [Member] |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |
Excess workers' compensation insurance coverage with Chubb | $ 15,000,000 |  |
Minimum [Member] |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |
Restricted cash and investments maturity period | 180 days |  |
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 | 78.00% | 78.00% | 77.00%
Maryland [Member] | AICE [Member] |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |
Excess workers' compensation insurance coverage with Chubb | $ 1,000,000 |  |
Maryland [Member] | Maximum [Member] | Chubb Limited [Member] |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |
Excess workers' compensation insurance coverage with Chubb | 25,000,000 |  |
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] |  |  |
Excess workers' compensation insurance coverage with Chubb | $ 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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