Fair Value of Financial Assets and Liabilities - Fair Value and Carrying Value of Long-Term Debt (Detail) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Debt Disclosure [Abstract] | ||
| Long-term debt and related current maturities, Fair Value | $ 43,209 | $ 31,866 |
| Long-term debt and related current maturities, Carrying Value | $ 44,391 | $ 31,864 |