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Stock-Based Compensation (Detail) - (Table 2) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Total | $ 5,105 | $ 4,907 | $ 15,340 | $ 15,680
Restricted Stock [Member] |  |  |  |
Allocated Share-based Compensation Expense | 3,937 | 3,902 | 12,075 | 12,540
Stock Options [Member] |  |  |  |
Allocated Share-based Compensation Expense | $ 1,168 | $ 1,005 | $ 3,265 | $ 3,140

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