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Stockholders' Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Equity [Abstract] |  |  |  |
Beginning Balance |  |  | $ 479,517 |
Net Income | $ 15,898 | $ 12,415 | 34,950 | $ 27,657
Dividend payments |  |  | (13,031) |
Dividends accrued for unvested restricted stock units |  |  | (43) |
Net unrealized gains on available-for-sale securities (net of tax) | 804 | 258 | 2,512 | (162)
Net unrealized losses on cash flow hedges (net of tax) | 142 |  | (196) |
Defined benefit plan adjustments (net of tax) | 73 | 36 | 214 | 103
Foreign currency translation adjustment | 1,541 | $ 575 | 5,402 | 1,202
Proceeds from stock option exercises |  |  | 6,606 | $ 1,076
Purchase of treasury stock |  |  | (17,348) |
ASU 2016-09 adoption |  |  | 10 |
Stock-based compensation expense |  |  | 5,573 |
Ending Balance | $ 504,166 |  | $ 504,166 |

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