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Stock Compensation Plans - Stock-Based Compensation Expense Included in Consolidated Statement of Income and Comprehensive Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation | $ 38,610 | $ 31,918 | $ 32,581
Less tax benefit | (7,305) | (6,556) | (5,659)
Total stock-based compensation, net of tax | 31,305 | 25,362 | 26,922
Equity-based awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation | 34,482 | 29,401 | 26,567
Liability-based awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation | $ 4,128 | $ 2,517 | $ 6,014

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