Income Taxes - Summary of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Income Tax Disclosure [Abstract] | |||
| Unrecognized tax benefits, Beginning balance | $ 775 | $ 775 | $ 775 |
| Additions for tax positions related to prior years | 0 | 0 | 0 |
| Additions for tax positions | 0 | 0 | 0 |
| Reductions for tax positions of prior years | 0 | 0 | 0 |
| Settlements | 0 | 0 | 0 |
| Unrecognized tax benefits, Ending balance | $ 775 | $ 775 | $ 775 |