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Share-Based Compensation Expenses (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Option plan $ 5,766 $ 6,210 $ 12,837 $ 17,772
Other share-based awards (3,919) (3,139) 18,191 15,680
Total share-based compensation before tax 1,847 3,071 31,028 33,452
Tax benefit 686 1,146 11,524 12,478
Total share-based compensation expense included in net income $ 1,161 $ 1,925 $ 19,504 $ 20,974