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Commitments and Contingencies - Additional Information (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Apr. 23, 2010 subsidiary
Loss Contingencies [Line Items] |  |  |  |
Rental expense | $ 87,300,000 | $ 85,900,000 | $ 89,900,000 |
Staffing Managers Case |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of subsidiaries | subsidiary |  |  |  | 1
Allegations loss | 0 |  |  |
Rodriguez Case |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Allegations loss | 0 |  |  |
Gentry Case |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Allegations loss | $ 0 |  |  |

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