Income Taxes - Schedule of Income Tax Benefit at Company's Effective Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended							11 Months Ended	12 Months Ended
	Feb. 09, 2018	Mar. 31, 2018	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ 520,989	$ (53,960)	$ (76,612)	$ (36,952)	$ (40,221)	$ (218,349)	$ (123,678)	$ (92,615)	$ 4,386	$ (207,745)		$ (430,256)
Tax provision at statutory tax rate (21% and 35% in 2018 and 2017, respectively)	109,408									(43,627)		(150,590)
Effect of:
Valuation allowance exclusive of Tax Act	(160,644)									43,565		162,496
Section 108 attribute reduction	92,343									0		0
Cancellation of debt income exclusion	(91,859)									(94)		0
State and local income tax	25,127									(4,904)		(26,396)
Section 382 interest adjustment	15,750									0		0
Share-based compensation	8,044									0		0
Non-deductible restructuring costs	1,978									149		13,475
Federal rate change related to Tax Act	0									0		173,405
Valuation allowance related to Tax Act	0									0		(180,033)
Other	(165)									2,260		4,286
Total income tax benefit	$ (18)	$ 189	$ (2,774)	$ (315)	$ 249	$ (5,384)	$ 455	$ 1,694	$ (122)	$ (2,651)		$ (3,357)
Federal statutory income tax rate											21.00%	35.00%