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Fresh Start Accounting - Additional Information (Details) |  | 11 Months Ended | 12 Months Ended |  |  |  |  |
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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 |  |  |  |

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