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Share-Based Compensation - Summary of Share-based Compensation Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Option plan $ 18,423 $ 23,876 $ 26,191
Other share-based awards 28,844 23,368 23,275
Total share-based compensation before tax 47,267 47,244 49,466
Tax benefit 17,555 17,546 18,451
Total share-based compensation expense included in net income $ 29,712 $ 29,698 $ 31,015