Employee Benefit Plan - Additional Information (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |||
| Discretionary plan contribution | $ 0.4 | $ 0.2 | $ 0.1 |