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Long-Term Debt - Additional Information (Detail) |  |  | 1 Months Ended | 11 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 19, 2020 USD ($) shares | Oct. 02, 2020 USD ($) | Dec. 31, 2020 USD ($) | Nov. 19, 2020 USD ($) shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2020 USD ($) | Feb. 19, 2020 USD ($) | Apr. 15, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total long-term debt |  |  | $ 710,000,000 |  | $ 710,000,000 | $ 2,711,573,000 |  |  |  |
Aggregate principal amount arranged | $ 20,600,000 |  |  | $ 20,600,000 |  |  |  |  |  |
Issued of common stock (in shares) | shares | 65,000,000 |  |  | 65,000,000 |  |  |  |  |  |
Gain (loss) on debt repurchase |  |  | 0 | $ 83,867,000 |  | 4,312,000 | $ (13,848,000) |  |  |
Interest expense |  |  |  | $ 28,014,000 |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior unsecured notes stated interest rate (percent) | 3.06% |  |  | 3.06% |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior unsecured notes stated interest rate (percent) | 6.58% |  |  | 6.58% |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit sublimit |  |  |  |  |  |  |  |  |  | $ 100,000,000.0
Senior unsecured notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal of senior unsecured notes |  |  | 0 |  | 0 | 1,982,568,000 |  |  |  |
Less: unamortized deferred financing costs on senior unsecured notes |  |  | $ 0 |  | $ 0 | 15,618,000 |  |  |  |
Face amount of repurchased debt | $ 133,900,000 |  |  | $ 133,900,000 |  | 24,600,000 |  |  |  |
Debt repurchased | $ 52,900,000 |  |  | 52,900,000 |  | 22,800,000 |  |  |  |
Write off of deferred finance costs |  |  |  | (800,000) |  | (200,000) |  |  |  |
Gain (loss) on debt repurchase |  |  |  | $ 80,200,000 |  | $ 1,600,000 |  |  |  |
Senior unsecured notes | Successor Board of Directors |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Issued of common stock (in shares) | shares | 20,000,000 |  |  | 20,000,000 |  |  |  |  |  |
Senior convertible notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of repurchased debt | $ 23,000,000.0 |  |  | $ 23,000,000.0 |  |  |  |  |  |
Debt repurchased | 15,200,000 |  |  | 15,200,000 |  |  |  |  |  |
Write off of deferred finance costs |  |  |  | (200,000) |  |  |  |  |  |
Gain (loss) on debt repurchase |  |  |  | 3,700,000 |  |  |  |  |  |
Write off of deferred debt discount |  |  |  | 4,200,000 |  |  |  |  |  |
Write off of equity component of notes |  |  |  | (300,000) |  |  |  |  |  |
Line of credit | Letter of Credit |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt, weighted average interest rate |  |  | 4.30% |  | 4.30% |  |  |  |  |
Outstanding letters of credit |  |  | $ 6,800,000 |  | $ 6,800,000 |  |  |  |  |
Line of credit | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit sublimit |  |  | $ 575,000,000.0 |  | $ 575,000,000.0 |  |  |  |  |
Restricted payments capacity, maximum |  |  |  |  |  |  |  |  | $ 25,000,000 |
Restricted payment added capacity able to be used, maximum |  |  |  |  |  |  |  |  | $ 10,000,000 |
Debt, weighted average interest rate |  |  | 2.20% |  | 2.20% | 3.80% |  |  |  |
Line of credit facility, capacity available for specific purpose other than for trade purchases |  |  | $ 3,000,000,000.0 |  | $ 3,000,000,000.0 |  |  |  |  |
Current borrowing base |  |  |  |  |  |  |  | $ 1,100,000,000.0 |  |
Write off of deferred finance costs |  |  | (1,500,000) |  |  | $ (1,600,000) | (300,000) |  |  |
Interest expense |  |  |  | 30,285,000 |  |  |  |  |  |
Swingline Loan | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit sublimit |  |  |  |  |  |  |  |  |  | $ 50,000,000.0
Predecessor Credit Facility | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Accumulated amortization, debt issuance costs | 7,000,000.0 |  | 6,400,000 | 7,000,000.0 | 6,400,000 |  | 7,100,000 |  |  |
Predecessor Credit Facility | Line of credit | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal of senior unsecured notes |  |  | $ 0 |  | $ 0 | 337,000,000 |  |  |  |
Extinguishment of debt | 60,600,000 |  |  |  |  |  |  |  |  |
Accrued interest | 800,000 |  |  |  |  |  |  |  |  |
Default penalty, additional interest rate |  |  | 2.00% |  | 2.00% |  |  |  |  |
OMP Credit Facility | Bridge Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit sublimit |  |  | $ 10,000,000.0 |  | $ 10,000,000.0 |  |  |  |  |
OMP Credit Facility | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Accumulated amortization, debt issuance costs | 800,000 |  |  | 800,000 |  | 900,000 | $ 500,000 |  |  |
OMP Credit Facility | Line of credit | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal of senior unsecured notes |  |  | 450,000,000 |  | 450,000,000 | 458,500,000 |  |  |  |
Line of credit sublimit |  |  | 575,000,000.0 |  | 575,000,000.0 |  |  |  |  |
Unused borrowing capacity |  |  | 125,000,000.0 |  | 125,000,000.0 | 114,800,000 |  |  |  |
OMP Credit Facility | Letter of Credit | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal of senior unsecured notes |  |  | 0 |  | 0 |  |  |  |  |
2.625% senior unsecured convertible notes due September 15, 2023 | Senior unsecured notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal of senior unsecured notes | $ 244,800,000 |  | $ 0 | $ 244,800,000 | $ 0 | 267,800,000 |  |  |  |
Senior unsecured notes stated interest rate (percent) | 2.625% |  | 2.625% | 2.625% | 2.625% |  |  |  |  |
Initial conversion rate (shares per $1000 principal) |  |  |  |  | 0.0763650 |  |  |  |  |
2.625% senior unsecured convertible notes due September 15, 2023 | Senior convertible notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of repurchased debt |  |  |  |  |  | 32,200,000 |  |  |  |
Debt repurchased |  |  |  |  |  | 23,000,000.0 |  |  |  |
Write off of deferred finance costs |  |  |  |  |  | (300,000) |  |  |  |
Gain (loss) on debt repurchase |  |  |  |  |  | 2,700,000 |  |  |  |
Write-off of unamortized debt discount |  |  |  |  |  | 6,200,000 |  |  |  |
Amended credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
EBITDAX ratio |  |  |  |  | 3.00 |  |  |  |  |
Minimum consolidated asset to liability ratio |  |  |  |  | 1.0 |  |  |  |  |
Amended credit facility | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Letter of credit unused borrowing base capacity |  |  | $ 308,200,000 |  | $ 308,200,000 |  |  |  |  |
6.875% senior unsecured notes due March 15, 2022 | Senior unsecured notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal of senior unsecured notes | $ 834,500,000 |  | 0 | $ 834,500,000 | 0 | 890,980,000 |  |  |  |
Senior unsecured notes stated interest rate (percent) | 6.875% |  |  | 6.875% |  |  |  |  |  |
Face amount of repurchased debt | $ 56,500,000 |  |  | $ 56,500,000 |  | 10,500,000 |  |  |  |
6.875% senior unsecured notes due January 15, 2023 | Senior unsecured notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal of senior unsecured notes | $ 307,700,000 |  | 0 | $ 307,700,000 | 0 | 351,953,000 |  |  |  |
Senior unsecured notes stated interest rate (percent) | 6.875% |  |  | 6.875% |  |  |  |  |  |
Face amount of repurchased debt | $ 44,200,000 |  |  | $ 44,200,000 |  | 14,100,000 |  |  |  |
Oasis Credit Facility | Revolving credit facility | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Less: unamortized deferred financing costs on senior unsecured notes |  |  | 8,000,000.0 |  | 8,000,000.0 |  |  |  |  |
Accumulated amortization, debt issuance costs |  |  | 300,000 |  | 300,000 |  |  |  |  |
Oasis Credit Facility | Line of credit | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal of senior unsecured notes |  |  | 260,000,000.0 |  | 260,000,000.0 | 0 |  |  |  |
DIP Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount arranged |  | $ 450,000,000.0 |  |  |  |  |  |  |  |
DIP Credit Facility | Letter of Credit |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Capacity available for new issuances |  | $ 100,000,000.0 |  |  |  |  |  |  |  |
Senior unsecured notes stated interest rate (percent) |  | 5.50% |  |  |  |  |  |  |  |
DIP Credit Facility | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount arranged |  | $ 150,000,000.0 |  |  |  |  |  |  |  |
DIP Credit Facility | Line of credit | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Extinguishment of debt | 300,000,000.0 |  |  |  |  |  |  |  |  |
Accrued interest | 1,400,000 |  |  |  |  |  |  |  |  |
Prepetition Secured Debt | Letter of Credit |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior unsecured notes stated interest rate (percent) |  | 4.25% |  |  |  |  |  |  |  |
Prepetition Secured Debt | Secured Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount arranged |  | $ 300,000,000.0 |  |  |  |  |  |  |  |
Exit Facility | Line of credit | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount arranged |  |  | 1,500,000,000.0 |  | 1,500,000,000.0 |  |  |  |  |
6.25% senior unsecured notes due May 1, 2026 | Senior unsecured notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal of senior unsecured notes | $ 395,100,000 |  | $ 0 | $ 395,100,000 | $ 0 | 400,000,000 |  |  |  |
Senior unsecured notes stated interest rate (percent) | 6.25% |  | 6.25% | 6.25% | 6.25% |  |  |  |  |
Face amount of repurchased debt | $ 4,900,000 |  |  | $ 4,900,000 |  |  |  |  |  |
6.50% senior unsecured notes due November 1, 2021 | Senior unsecured notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal of senior unsecured notes | $ 43,600,000 |  | $ 0 | $ 43,600,000 | $ 0 | 71,835,000 |  |  |  |
Senior unsecured notes stated interest rate (percent) | 6.50% |  | 6.50% | 6.50% | 6.50% |  |  |  |  |
Face amount of repurchased debt |  |  |  |  |  | $ 28,200,000 |  |  |  |
LIBOR | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Commitment fee (percent) |  |  |  |  | 0.50% |  |  |  |  |
LIBOR | DIP Credit Facility | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Applicable margin on variable rate (percent) |  | 4.25% |  |  |  |  |  |  |  |
LIBOR | Refinanced Post-Petition Secured Debt | Secured Debt | Revolving credit facility | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior unsecured notes stated interest rate (percent) |  | 1.00% |  |  |  |  |  |  |  |
Base Rate | Predecessor Credit Facility | ABR Loans | Revolving credit facility | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior unsecured notes stated interest rate (percent) |  | 1.75% |  |  |  |  |  |  |  |
Base Rate | Predecessor Credit Facility | Eurodollar Loans | Revolving credit facility | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior unsecured notes stated interest rate (percent) |  | 3.25% |  |  |  |  |  |  |  |
Base Rate | DIP Credit Facility | Revolving credit facility | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior unsecured notes stated interest rate (percent) |  | 2.00% |  |  |  |  |  |  |  |
Base Rate | Refinanced Post-Petition Secured Debt | Secured Debt | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Applicable margin on variable rate (percent) |  | 3.25% |  |  |  |  |  |  |  |
Base Rate | ABR Based Loans | Line of credit | Revolving credit facility | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior unsecured notes stated interest rate (percent) |  | 0.75% |  |  |  |  |  |  |  |
Base Rate | Eurodollar Based Loans | Eurodollar Loans | Revolving credit facility | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior unsecured notes stated interest rate (percent) |  | 2.25% |  |  |  |  |  |  |  |
OMP Operating, LLC | Letter of Credit | Letter of Credit |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit sublimit |  |  | $ 10,000,000.0 |  | $ 10,000,000.0 |  |  |  |  |
OMP Operating, LLC | Federal Funds Effective Swap Rate | ABR Loans | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Applicable margin on variable rate (percent) |  |  |  |  | 0.50% |  |  |  |  |

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