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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | $ 12,757 | $ 7,796 | $ 21,091 | $ 15,571
Less: Tax benefit | (2,141) | (1,335) | (3,523) | (2,898)
Total stock-based compensation expense, after tax | 10,616 | 6,461 | 17,568 | 12,673
Equity-based awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 10,696 | 7,554 | 18,300 | 15,174
Liability-based awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | $ 2,061 | $ 242 | $ 2,791 | $ 397

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