Components of Income Tax Provision (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Federal income tax expense (benefit):
Current	$ (24,777)	$ (42,020)	$ 39,438
Deferred	(134,592)	(83,812)	39,673
Federal Income Tax Expense (Benefit), Continuing Operations, Total	(159,369)	(125,832)	79,111
State income tax expense (benefit):
Current	(257)	(3,480)	3,987
Deferred	(14,163)	(12,433)	5,292
State and Local Income Tax Expense (Benefit), Continuing Operations, Total	(14,420)	(15,913)	9,279
Foreign income tax expense (benefit):
Current	(368)	(2,590)	4,521
Deferred	(3,405)	(3,628)	(1,292)
Foreign Income Tax Expense (Benefit), Continuing Operations, Total	(3,773)	(6,218)	3,229
Total income tax expense (benefit):
Current	(25,402)	(48,090)	47,946
Deferred	(152,160)	(99,873)	43,673
Total income tax expense (benefit):	$ (177,562)	$ (147,963)	$ 91,619