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Stock-Based Compensation (Detail) - (Table 3) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Payment Arrangement [Abstract] |  |  |  |
Proceeds from stock options exercised | $ 0 | $ 807 | $ 960 | $ 2,606
Intrinsic value of stock options exercised | $ 0 | $ 453 | $ 758 | $ 1,295

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