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Share-Based Compensation Expenses (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Option plan $ 6,698 $ 6,310 $ 19,878 $ 18,263
Other share-based awards 5,689 8,103 22,167 19,202
Total share-based compensation before tax 12,387 14,413 42,045 37,465
Tax benefit 4,621 5,376 15,683 13,990
Total share-based compensation expense included in net income $ 7,766 $ 9,037 $ 26,362 $ 23,475