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Share-Based Compensation Expenses (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Option plan $ 3,057 $ 1,422
Other share-based awards 5,889 9,092
Total share-based compensation before tax 8,946 10,514
Tax benefit 2,129 3,905
Total share-based compensation expense included in net income $ 6,817 $ 6,609