Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Income Tax Disclosure [Abstract] | ||
| Beginning Balance | $ 2,504 | $ 3,525 |
| Change in measurement of existing tax positions related to expiration of statute of limitations | (100) | (975) |
| Foreign exchange difference in Canadian operations | 2 | (46) |
| Ending Balance | $ 2,406 | $ 2,504 |