Retirement Plan - Additional Information (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Schedule Of Sale Of Subsidiary [Abstract] | |||
| Employers' sponsors contribution retirement plan | 90.00% | ||
| Contribution to retirement plan, percentage of employee contribution | 100.00% | ||
| Percentage of employee contribution to retirement plan | 5.00% | ||
| Employers' sponsors contribution retirement plan amount | $ 0.2 | $ 0.2 | $ 0.2 |