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Stock-Based Compensation (Detail) - (Table 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Total | $ 20,847 | $ 19,509 | $ 18,698
Restricted Stock [Member] |  |  |
Allocated Share-based Compensation Expense | 16,616 | 16,494 | 15,543
Stock Options [Member] |  |  |
Allocated Share-based Compensation Expense | $ 4,231 | $ 3,015 | $ 3,155

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