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Stock Compensation Plans - Stock-Based Compensation Expense and Related Tax Benefits (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | $ 13,494 | $ 12,757 | $ 21,479 | $ 21,091
Less: Tax benefit | (2,568) | (2,141) | (3,962) | (3,523)
Total stock-based compensation expense, after tax | 10,926 | 10,616 | 17,517 | 17,568
Equity-based awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 10,358 | 10,696 | 18,982 | 18,300
Liability-based awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | $ 3,136 | $ 2,061 | $ 2,497 | $ 2,791

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