Income Taxes - Components of Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal - current	$ 230	$ 63,223	$ 66,843
State - current	(60)	93	(121)
Foreign - current	10,297	71,655	59,926
Total current	10,467	134,971	126,648
Federal - deferred	(108,274)	(245,045)	(6,699)
Foreign - deferred	2,011	3,011	8,231
Total deferred	(106,263)	(242,034)	1,532
Income tax expense	$ (95,796)	$ (107,063)	$ 128,180