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Stock-Based Compensation (Detail) - (Table 3) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |
Proceeds from stock options exercised | $ 1,077 | $ 9,596 | $ 1,799 | $ 11,115
Intrinsic value of stock options exercised | $ 513 | $ 4,902 | $ 842 | $ 5,479

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