Fresh Start Accounting - Additional Information (Details)		11 Months Ended	12 Months Ended
	Nov. 19, 2020 USD ($) $ / shares shares	Nov. 19, 2020 USD ($) $ / shares shares	Dec. 31, 2018 MMBoe	Dec. 31, 2020 USD ($) $ / MMcf $ / bbl	Oct. 02, 2020 USD ($)	Mar. 31, 2020	Dec. 31, 2019	Nov. 19, 2018
Fresh Start Accounting [Line Items]
Percentage of voting interest received	50.00%	50.00%
Reorganization value of Successor assets	$ 2,237,991,000	$ 2,237,991,000
Reorganization value	1,300,000,000	1,300,000,000
Post-petition liabilities and allowed claims	3,200,000,000	3,200,000,000
Cash attributable to OMP		4,500,000
Restricted cash	1,400,000	1,400,000
Restricted cash related to professional fees		10,400,000
Write-off of Predecessor Credit Facility deferred financing costs		243,000
Liabilities subject to compromise, accounts payable	19,900,000	19,900,000
Reclassification of payable for vested liability awards to accounts payable	$ 1,913,000	1,913,000
Interest expense		$ 28,014,000
Issued of common stock (in shares) | shares	65,000,000	65,000,000
Warrants to purchase of number of shares (in shares) | shares	1,621,622	1,621,622
Fair value assumptions exercise price of warrants | $ / shares	$ 14.68	$ 14.68
Aggregate principal amount arranged	$ 20,600,000	$ 20,600,000
Positive (negative) revisions of previous estimates - proved developed reserves (MMBoe) | MMBoe			(20,200)
Bobcat DevCo | OMS Holdings LLC (“OMS”)
Fresh Start Accounting [Line Items]
Ownership interest (percent)			75.00%	64.70%			64.70%	75.00%
Beartooth DevCo | OMS Holdings LLC (“OMS”)
Fresh Start Accounting [Line Items]
Ownership interest (percent)				30.00%
DIP Credit Facility
Fresh Start Accounting [Line Items]
Aggregate principal amount arranged					$ 450,000,000.0
Oasis Credit Facility
Fresh Start Accounting [Line Items]
Deferred financing costs	7,300,000	7,300,000
E&P
Fresh Start Accounting [Line Items]
Increase in commodity prices				2.00%
E&P | Crude oil
Fresh Start Accounting [Line Items]
Derivative, cap price | $ / bbl				75
E&P | Natural gas
Fresh Start Accounting [Line Items]
Derivative, cap price | $ / MMcf				4.80
Revolving credit facility | Line of credit
Fresh Start Accounting [Line Items]
Interest expense		$ 30,285,000
Revolving credit facility | DIP Credit Facility
Fresh Start Accounting [Line Items]
Aggregate principal amount arranged					$ 150,000,000.0
Revolving credit facility | DIP Credit Facility | Line of credit
Fresh Start Accounting [Line Items]
Extinguishment of debt	300,000,000.0
Accrued interest	1,400,000
Revolving credit facility | Predecessor Credit Facility | Line of credit
Fresh Start Accounting [Line Items]
Extinguishment of debt	60,600,000
Accrued interest	$ 800,000
Proved Oil and Gas Properties | Discounted Cash Flow | Market-based Weighted Average Cost of Capital
Fresh Start Accounting [Line Items]
Estimated future cash flows, measurement input (percent)						12.70%
Proved Oil and Gas Properties | Discounted Cash Flow | Market-based Weighted Average Cost of Capital | E&P
Fresh Start Accounting [Line Items]
Estimated future cash flows, measurement input (percent)	11.00%	11.00%
Proved Oil and Gas Properties | Discounted Cash Flow | Market-based Weighted Average Cost of Capital | Beartooth DevCo
Fresh Start Accounting [Line Items]
Estimated future cash flows, measurement input (percent)	13.00%	13.00%
Proved Oil and Gas Properties | Discounted Cash Flow | Market-based Weighted Average Cost of Capital | Bobcat DevCo
Fresh Start Accounting [Line Items]
Estimated future cash flows, measurement input (percent)	13.00%	13.00%
Minimum
Fresh Start Accounting [Line Items]
Reorganization value				$ 1,300,000,000
Maximum
Fresh Start Accounting [Line Items]
Reorganization value				$ 1,700,000,000