Income Taxes - Components of Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Federal - current	$ 63,223	$ 66,843	$ 40,045
State - current	93	(121)	69
Foreign - current	71,656	59,926	151,339
Total current	134,972	126,648	191,453
Federal - deferred	(245,045)	(6,699)	46,767
Foreign - deferred	3,010	8,231	(12,666)
Total deferred	(242,034)	1,532	34,101
Income tax expense	$ (107,063)	$ 128,180	$ 225,554