Income Tax - Schedule of Effective Income Tax Rate Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Loss before income taxes	$ (203,260)	$ (1,043,856)	$ (111,377)
Statutory rate	35.00%	35.00%	35.00%
Income tax benefit computed at statutory rate	$ (71,141)	$ (365,350)	$ (38,982)
Reconciling items:
Non-deductible pre-IPO loss			13,264
State income taxes	546	(21)	(39)
Other, net	854	795	71
Change in tax status			97,609
Gain on acquisition of Eclipse Operating		(141)	(124)
Change in valuation allowance	70,287	292,271
Total income tax expense (benefit)	$ 546	$ (72,446)	$ 71,799