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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%