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Share-Based Compensation Expenses (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Option plan $ 5,649 $ 6,158 $ 7,071 $ 11,562
Other share-based awards 13,018 9,362 22,110 18,819
Total share-based compensation before tax 18,667 15,520 29,181 30,381
Tax benefit 6,933 5,789 10,838 11,332
Total share-based compensation expense included in net income $ 11,734 $ 9,731 $ 18,343 $ 19,049