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Stock-Based Compensation (Detail) - (Table 2) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Total | $ 5,597 | $ 4,709 | $ 10,773 | $ 9,636
Restricted Stock [Member] |  |  |  |
Allocated Share-based Compensation Expense | 4,424 | 4,097 | 8,638 | 8,240
Stock Options [Member] |  |  |  |
Allocated Share-based Compensation Expense | $ 1,173 | $ 612 | $ 2,135 | $ 1,396

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