Share-Based Compensation Expenses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Option plan	$ 26,191	$ 24,428	$ 22,245
Other share-based awards	23,275	26,574	57,640
Total share-based compensation before tax	49,466	51,002	79,885
Tax benefit	18,451	19,039	29,835
Total share-based compensation expense included in net income	$ 31,015	$ 31,963	$ 50,050