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Share-Based Compensation Expenses (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Option plan $ 6,758 $ 5,649 $ 9,815 $ 7,071
Other share-based awards 13,847 13,018 19,736 22,110
Total share-based compensation before tax 20,605 18,667 29,551 29,181
Tax benefit 4,904 6,933 7,033 10,838
Total share-based compensation expense included in net income $ 15,701 $ 11,734 $ 22,518 $ 18,343