Income Taxes - Reconciliation of Income Tax Benefit (Provision) (Detail) - USD ($) $ in Thousands		4 Months Ended	8 Months Ended	12 Months Ended
		May 04, 2017	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Income Tax Contingency [Line Items]
Expected tax benefit (expense) at federal statutory rate			$ 310	$ 7,402	$ 11,468
State income tax benefit (expense), net of federal benefit			240	946	1,108
Non-deductible expenses			(187)	(3,659)	1,328
Changes in valuation allowances			24,767	(4,332)	(14,194)
Remeasurement of federal deferred tax assets due rate change			(22,958)	0	0
Pass-through entities	[1]		0	0	0
Non-cash compensation			0	(367)	0
Other			4	60	290
Total income tax benefit (expense)			$ 2,176	$ 50	$ 0
Predecessor [Member]
Income Tax Contingency [Line Items]
Expected tax benefit (expense) at federal statutory rate		$ 5,764
State income tax benefit (expense), net of federal benefit		30
Non-deductible expenses		0
Changes in valuation allowances		0
Remeasurement of federal deferred tax assets due rate change		0
Pass-through entities	[1]	(5,686)
Non-cash compensation		0
Other		(17)
Total income tax benefit (expense)		$ 91

[1] MEMP, a publicly traded partnership with qualifying income, was a pass-through entity for federal income tax purposes.