Income Taxes - Changes in Valuation Allowance for Deferred Tax Assets (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Income Tax Disclosure [Abstract] | |||
| Beginning balance | $ 279,867 | $ 194,739 | $ 178,729 |
| Charged to expense | 10,095 | 95,757 | 29,484 |
| NOL/tax credit claimed/expired | (872) | (1,197) | (7,605) |
| Translation adjustments | (7,617) | (9,432) | (5,869) |
| Ending balance | $ 281,473 | $ 279,867 | $ 194,739 |