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Employee Benefits - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract] |  |  |
Maximum percentage of a participant's eligible compensation that a participating may elect to contribute, on a tax-deferred annually to the plan (as a percent) 50.00% | 80.00% |  |
Percentage of matching contribution made by company, of first 6% of participating employees contributions (as a percent) | 50.00% |  |
Percentage of participating employees contribution, matched 100% (as a percent) | 6.00% |  |
Employer contribution | $ 9.0 | $ 8.5 | $ 7.9
Deferred gains or (losses) of investment | $ (0.7) | $ 3.7 | $ 8.2

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- Definition Deferred compensation plan gain loss on investments. + References No definition available. + Details
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- Definition Defined contribution plan maximum employee contribution percentage. + References No definition available. + Details
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- Definition Defined contribution plan percentage of base compensation. + References No definition available. + Details
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Balance Type: | na
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- References No definition available. + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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