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Summary of Operations and Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 Unit Segment | Dec. 31, 2012 | Dec. 31, 2011 | Mar. 01, 2010 Ecole Insurance Company [Member] | Dec. 31, 2013 Minimum [Member] | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2013 Minimum [Member] ACE [Member] | Dec. 31, 2013 Maximum [Member] | Dec. 31, 2012 Maximum [Member] | Dec. 31, 2013 Maximum [Member] ACE [Member]
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Revenue from attributable to geographic area | 74.00% | 69.00% | 61.00% |  |  |  |  |  |  |
Workers Compensation Coverage Per Occurrence |  |  |  |  |  |  | $ 1,000,000 |  |  | $ 5,000,000
Restricted capital | 11,205,000 | 9,726,000 |  | 6,100,000 |  |  |  |  |  |
Operating and reporting segment | 1 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Cash and cash equivalents exceeded federally insured limits Value | 92,600,000 |  |  |  |  |  |  |  |  |
Restricted marketable securities maturity period |  |  |  |  | 180 days | 180 days |  | 2 years | 2 years |
Likelihood of tax benefit being realized upon settlement | 50.00% |  |  |  |  |  |  |  |  |
Number of reporting unit | 1 |  |  |  |  |  |  |  |  |
Goodwill and intangible assets impairment | 0 |  |  |  |  |  |  |  |  |
Income taxes paid | $ 9,000,000 | $ 3,300,000 | $ 4,700,000 |  |  |  |  |  |  |

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