Share-Based Compensation Expenses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Option plan	$ 23,876	$ 26,191	$ 24,428
Other share-based awards	23,368	23,275	26,574
Total share-based compensation before tax	47,244	49,466	51,002
Tax benefit	17,546	18,451	19,039
Total share-based compensation expense included in net income	$ 29,698	$ 31,015	$ 31,963