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Share-Based Compensation Expenses (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Option awards $ 6,936 $ 6,821 $ 15,049 $ 16,636
Other share-based awards 12,755 (748) 37,212 18,988
Total share-based compensation before tax 19,691 6,073 52,261 35,624
Tax benefit 4,686 1,446 12,438 8,479
Total share-based compensation expense included in net income $ 15,005 $ 4,627 $ 39,823 $ 27,145