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Share-Based Compensation Expenses (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Option plan $ 1,422 $ 5,404
Other share-based awards 9,092 9,457
Total share-based compensation before tax 10,514 14,861
Tax benefit 3,905 5,543
Total share-based compensation expense included in net income $ 6,609 $ 9,318