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Stock-Based Compensation - Effect of Recording Stock-Based Compensation (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation | $ 49,194 | $ 27,262 | $ 24,378
Windfall tax effect on stock-based compensation | (2,244) | (8,277) | (11,071)
Net effect on net income | $ 46,950 | $ 18,985 | $ 13,307
Basic | $ 0.86 | $ 0.35 | $ 0.25
Diluted | $ 0.85 | $ 0.35 | $ 0.24
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation | $ 47,005 | $ 24,883 | $ 22,428
Stock Appreciation Rights (SARs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation | 73 | 98 | 529
Employee Stock Purchase Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation | $ 2,116 | $ 2,281 | $ 1,421

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