Income Taxes - Schedule of Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Current Federal	$ (140,987)	$ (19,476)	$ (7)
Current State	(3,875)	(1,496)	(108)
Total current	(144,862)	(20,972)	(115)
Deferred Federal	8,179	36,917
Deferred State	90	313
Total deferred	8,269	37,230
Total income tax (expense) benefit	$ (136,593)	$ 16,258	$ (115)