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Stock Plans - Schedule of Stock Compensation Expense (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Payment Arrangement [Abstract] |  |  |
Restricted stock units | $ 6,258 | $ 6,914 | $ 6,221
Stock options | 113 | 487 | 217
Performance stock units | 549 | 6,359 | 5,801
Total stock-compensation expense before income taxes | 6,920 | 13,760 | 12,239
Income tax benefit | 1,668 | 3,357 | 2,974
Total stock-compensation expense, net of income tax benefit | $ 5,252 | $ 10,403 | $ 9,265

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