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Stockholders' Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Equity [Abstract] |  |  |  |
Beginning Balance |  |  | $ 497,911 |
Net Income (Loss) | $ 7,589 | $ 15,898 | (10,895) | $ 34,950
Dividend payments |  |  | (12,976) |
Dividends accrued for unvested restricted stock units |  |  | (15) |
Net unrealized gains (losses) on available-for-sale securities | (32) | 804 | (3,340) | 2,512
Defined benefit plan adjustments (net of tax) | 37 | 73 | 104 | 214
Foreign currency translation adjustment | (451) | $ 1,541 | (3,033) | 5,402
Proceeds from stock option exercises |  |  | 1,321 | $ 6,606
Purchase of treasury stock |  |  | (14,185) |
Adoption of new accounting standards (see Note 1) |  |  | 3,499 |
Stock-based compensation expense |  |  | 5,243 |
RSU's and restricted stock vested |  |  | (33) |
Ending Balance | $ 463,601 |  | $ 463,601 |

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