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Stock Based Compensation (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation | $ 44,906 | $ 37,897 | $ 33,577
Income tax benefit | (13,060) | (8,360) | (12,036)
Total stock-based compensation expense after income taxes | 31,846 | 29,537 | 21,541
Cost Of Revenues |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation | 4,227 | 3,480 | 3,129
Engineering And Development |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation | 12,039 | 9,913 | 9,181
Selling and Administrative |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation | $ 28,640 | $ 24,504 | $ 21,267

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