Stockholders' Equity - Additional Information (Detail) - USD ($) $ in Millions |
12 Months Ended | |||
|---|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
Dec. 31, 2012 |
|
| Stockholders Equity Note [Abstract] | ||||
| Existing long-term incentive plan | 200,000 | |||
| Shares available for future award under proposed long term incentive plan | 177,000 | |||
| Shares awarded under proposed long term incentive plan | 8,000 | 8,000 | 7,000 | |
| Repurchase of authorized shares | 2,000,000 | |||
| Shares repurchased under stock repurchase program | 49,000 | |||
| Shares repurchased under stock repurchase program, value | $ 0.7 | |||
| Shares available for repurchase under the plan | 1,951,000 | |||