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Stock-based Compensation - Compensation Expense Recorded for All Stock Options, Stock Awards and SARs (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |  |
Compensation expense | $ 2,273 | $ 3,335 | $ 7,045 | $ 6,722

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