Goodwill and Other Intangible Assets - Estimated Amortization Expense Related to Intangible Assets (Detail) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Goodwill And Intangible Assets Disclosure [Abstract] | ||
| Year ending December 31, 2017 | $ 759 | |
| Year ending December 31, 2018 | 705 | |
| Total | $ 1,464 | $ 2,334 |