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Long-Term Debt - Additional Information (Details)
3 Months Ended 9 Months Ended
Oct. 02, 2020
USD ($)
Sep. 29, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Jul. 01, 2020
USD ($)
Jun. 01, 2020
USD ($)
Apr. 24, 2020
USD ($)
Apr. 23, 2020
USD ($)
Apr. 15, 2019
USD ($)
Debt Instrument [Line Items]                      
Gain (loss) on extinguishment of debt     $ (20,000) $ 0 $ 83,867,000 $ 0          
Unsecured Senior Notes                      
Debt Instrument [Line Items]                      
Long-term debt, fair value     47,700,000   47,700,000            
Senior Secured Superpriority Debtor-in-Possession Revolving Credit Agreement | Subsequent Event                      
Debt Instrument [Line Items]                      
Aggregate principal amount arranged $ 450,000,000                    
Senior Notes                      
Debt Instrument [Line Items]                      
Aggregate principal amount of debt repurchased     133,900,000   133,900,000            
Cost of debt repurchased     $ 52,900,000   52,900,000            
Gain (loss) on extinguishment of debt         80,200,000            
Write-off of deferred finance cost         $ 800,000            
Senior Notes | 2022 and 2023 Notes                      
Debt Instrument [Line Items]                      
Debt maturity - number of days before maturity of senior unsecured notes         90 days            
Senior Notes | 2.625% senior unsecured convertible notes due September 15, 2023                      
Debt Instrument [Line Items]                      
Stated interest rate (as percent)     2.625%   2.625%            
Aggregate principal amount of debt repurchased     $ 23,000,000.0   $ 23,000,000.0            
Cost of debt repurchased     15,200,000   15,200,000            
Gain (loss) on extinguishment of debt     3,700,000                
Write-off of deferred finance cost     200,000                
Debt issued     244,800,000   244,800,000            
Amortization of debt discount     4,200,000                
Equity component of convertible debt     300,000   $ 300,000            
Debt conversion rate per $1000 principal (in shares per $1000)         0.076365            
Senior Notes | Senior Notes                      
Debt Instrument [Line Items]                      
Unsecured debt     1,580,900,000   $ 1,580,900,000            
Senior Notes | Senior Notes | Level 1                      
Debt Instrument [Line Items]                      
Long-term debt, fair value     $ 369,600,000   $ 369,600,000            
Senior Notes | Senior Notes | Minimum                      
Debt Instrument [Line Items]                      
Stated interest rate (as percent)     6.25%   6.25%            
Senior Notes | Senior Notes | Maximum                      
Debt Instrument [Line Items]                      
Stated interest rate (as percent)     6.875%   6.875%            
Senior Notes | 6.50% senior unsecured notes due November 1, 2021                      
Debt Instrument [Line Items]                      
Stated interest rate (as percent)     6.50%   6.50%            
Aggregate principal amount of debt repurchased     $ 28,200,000   $ 28,200,000            
Senior Notes | 6.875% senior unsecured notes due March 15, 2022                      
Debt Instrument [Line Items]                      
Stated interest rate (as percent)     6.875%   6.875%            
Aggregate principal amount of debt repurchased     $ 56,500,000   $ 56,500,000            
Senior Notes | 6.875% senior unsecured notes due January 15, 2023                      
Debt Instrument [Line Items]                      
Stated interest rate (as percent)     6.875%   6.875%            
Aggregate principal amount of debt repurchased     $ 44,200,000   $ 44,200,000            
Senior Notes | 6.25% senior unsecured notes due May 1, 2026                      
Debt Instrument [Line Items]                      
Stated interest rate (as percent)     6.25%   6.25%            
Aggregate principal amount of debt repurchased     $ 4,900,000   $ 4,900,000            
Secured Debt | Prepetition Secured Debt | Subsequent Event                      
Debt Instrument [Line Items]                      
Aggregate principal amount arranged 300,000,000                    
Initial financing available to the borrower 240,000,000.0                    
Revolving Credit Facility | Senior Secured Superpriority Debtor-in-Possession Revolving Credit Agreement | Subsequent Event                      
Debt Instrument [Line Items]                      
Aggregate principal amount arranged 150,000,000                    
Initial financing available to the borrower $ 120,000,000                    
Revolving Credit Facility | Senior Secured Superpriority Debtor-in-Possession Revolving Credit Agreement | LIBOR | Subsequent Event                      
Debt Instrument [Line Items]                      
Spread on variable rate (percent) 5.50%                    
Revolving Credit Facility | Senior Secured Superpriority Debtor-in-Possession Revolving Credit Agreement | Alternate Base Rate | Subsequent Event                      
Debt Instrument [Line Items]                      
Spread on variable rate (percent) 4.50%                    
Additional spread on variable rate basis upon an event of default (percent) 6.75%                    
Maturity term extension period available under certain conditions 3 months                    
Revolving Credit Facility | Senior Secured Superpriority Debtor-in-Possession Revolving Credit Agreement | Minimum | LIBOR | Subsequent Event                      
Debt Instrument [Line Items]                      
Stated interest rate (as percent) 1.00%                    
Revolving Credit Facility | Senior Secured Superpriority Debtor-in-Possession Revolving Credit Agreement | Minimum | Alternate Base Rate | Subsequent Event                      
Debt Instrument [Line Items]                      
Stated interest rate (as percent) 2.00%                    
Revolving Credit Facility | Credit Facility                      
Debt Instrument [Line Items]                      
Line of credit facility amount     3,000,000,000.0   $ 3,000,000,000.0            
Debt maturity - number of days before maturity of senior unsecured notes         90 days            
Credit facility borrowing base     562,600,000   $ 562,600,000   $ 600,000,000.0 $ 612,500,000 $ 625,000,000.0 $ 1,300,000,000.0  
Line of credit facility, current borrowing capacity                 $ 625,000,000.0 $ 1,100,000,000.0  
Interest charges         30,300,000            
Revolving Credit Facility | Credit Facility | Oasis Credit Facility                      
Debt Instrument [Line Items]                      
Total long-term debt     $ 360,600,000   $ 360,600,000            
Weighted average interest rate (percent)     3.40%   3.30%            
Letters of credit outstanding     $ 76,900,000   $ 76,900,000            
Company's maximum ratio -Total Debt to EBITDA                 4.00    
Revolving Credit Facility | Credit Facility | OMP Credit Facility                      
Debt Instrument [Line Items]                      
Total long-term debt     487,500,000   487,500,000            
Credit facility borrowing base     $ 575,000,000.0   $ 575,000,000.0            
Weighted average interest rate (percent)     1.90%   2.60%            
Line of credit facility, remaining borrowing capacity     $ 87,500,000   $ 87,500,000            
Interest charges     $ 0   $ 28,000,000.0            
Default penalty, additional interest (percent)     2.00%   2.00%            
Revolving Credit Facility | Credit Facility | OMP Credit Facility | Minimum                      
Debt Instrument [Line Items]                      
Commitment fee percentage         0.375%            
Revolving Credit Facility | Credit Facility | OMP Credit Facility | Maximum                      
Debt Instrument [Line Items]                      
Commitment fee percentage         0.50%            
Revolving Credit Facility | Credit Facility | Exit Facility                      
Debt Instrument [Line Items]                      
Aggregate principal amount arranged   $ 1,500,000,000                  
Initial financing available to the borrower   $ 575,000,000.0                  
Maturity term   3 years 6 months                  
Revolving Credit Facility | Swingline Loan                      
Debt Instrument [Line Items]                      
Credit facility borrowing base                 $ 100,000,000.0   $ 50,000,000.0
Revolving Credit Facility | Secured Debt | Refinanced Post-Petition Secured Debt | LIBOR | Subsequent Event                      
Debt Instrument [Line Items]                      
Spread on variable rate (percent) 4.25%                    
Revolving Credit Facility | Secured Debt | Refinanced Post-Petition Secured Debt | Alternate Base Rate | Subsequent Event                      
Debt Instrument [Line Items]                      
Spread on variable rate (percent) 3.25%                    
Revolving Credit Facility | Secured Debt | Refinanced Post-Petition Secured Debt | Minimum | LIBOR | Subsequent Event                      
Debt Instrument [Line Items]                      
Stated interest rate (as percent) 1.00%                    
Revolving Credit Facility | Secured Debt | Refinanced Post-Petition Secured Debt | Minimum | Alternate Base Rate | Subsequent Event                      
Debt Instrument [Line Items]                      
Stated interest rate (as percent) 2.00%                    
Letter of Credit | Senior Secured Superpriority Debtor-in-Possession Revolving Credit Agreement | Subsequent Event                      
Debt Instrument [Line Items]                      
Initial financing available to the borrower $ 80,000,000                    
Stated interest rate (as percent) 5.50%                    
Letter of Credit | Prepetition Secured Debt | Subsequent Event                      
Debt Instrument [Line Items]                      
Stated interest rate (as percent) 4.25%