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Share-Based Compensation Expenses (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Option awards $ 6,801 $ 6,758 $ 8,113 $ 9,815
Other share-based awards 14,839 13,847 24,457 19,736
Total share-based compensation before tax 21,640 20,605 32,570 29,551
Tax benefit 5,151 4,904 7,752 7,033
Total share-based compensation expense included in net income $ 16,489 $ 15,701 $ 24,818 $ 22,518