Asset Retirement Obligations - Summary of Changes in Asset Retirement Obligations (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
Asset Retirement Obligations [Line Items]
Asset retirement obligations at beginning of period			$ 96,127	$ 76,344	$ 100,173
Liabilities added from acquisition or drilling	[1]		191	9,497	89
Liabilities removed upon sale of wells			0	0	(15,702)
Liabilities settled			(633)	(259)	(767)
Accretion expense			4,384	5,559	5,711
Revision of estimates	[2]		104	(52)	(13,160)
Asset retirement obligation at end of period		$ 96,127	100,173	91,089	76,344
Fresh start adjustment	[3]		0	0	0
Less: Current Portion			713	623	477
Asset retirement obligations - long-term portion		95,186	99,460	$ 90,466	$ 75,867
Predecessor [Member]
Asset Retirement Obligations [Line Items]
Asset retirement obligations at beginning of period		155,702	$ 159,055
Liabilities added from acquisition or drilling	[1]	6
Liabilities removed upon sale of wells		0
Liabilities settled		(164)
Accretion expense		3,407
Revision of estimates	[2]	104
Asset retirement obligation at end of period		159,055
Fresh start adjustment	[3]	(62,928)
Less: Current Portion		941
Asset retirement obligations - long-term portion		$ 95,186

[1] The increase in liabilities added from acquisition or drilling for the year ended December 31, 2019, is primarily due to the Merger with Midstates.

[2] The decrease in revision of estimates for the year ended December 31, 2018 is primarily due to receiving new cost estimates from third parties regarding the estimated plugging and abandonment costs.

[3] As a result of the application of fresh start accounting, the Successor recorded its asset retirement obligation at fair value as of the Effective Date.