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Debt Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 20, 2020
Dec. 20, 2019
Feb. 28, 2019
Apr. 30, 2020
Mar. 31, 2019
Feb. 28, 2019
Sep. 30, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Jan. 31, 2018
Debt Instrument [Line Items]                          
Borrowings on credit facilities                   $ 210,000,000 $ 455,000,000    
Term of debt instrument             4 years            
Repayments of debt                   101,132,000 400,000,000    
Gain (loss) on extinguishment of debt, net               $ 17,847,000 $ (650,000) 17,254,000 30,616,000    
Noble Joe Knight                          
Debt Instrument [Line Items]                          
Purchase price of asset acquired     $ 83,800,000     $ 83,800,000              
Noble Johnny Whitstine                          
Debt Instrument [Line Items]                          
Purchase price of asset acquired             $ 93,800,000            
2017 Credit Facility matures January 2023                          
Debt Instrument [Line Items]                          
Maximum borrowing capacity under credit facilities               1,300,000,000 $ 1,500,000,000 1,300,000,000 $ 1,500,000,000    
2019 Seller Loan                          
Debt Instrument [Line Items]                          
Financed value     $ 53,600,000     $ 53,600,000              
Term of debt instrument           4 years              
2019 Seller Loan | Due at End of Third-Year                          
Debt Instrument [Line Items]                          
Term of debt instrument           4 years              
Percentage of principal payment due at end of term     5.00%     5.00%              
2019 Seller Loan | Due at End of Four-Year Term                          
Debt Instrument [Line Items]                          
Percentage of principal payment due at end of term     95.00%     95.00%              
2018 Seller Loan                          
Debt Instrument [Line Items]                          
Financed value             $ 60,000,000.0            
2018 Seller Loan | Due at End of Third-Year                          
Debt Instrument [Line Items]                          
Percentage of principal payment due at end of term             5.00%            
2018 Seller Loan | Due at End of Four-Year Term                          
Debt Instrument [Line Items]                          
Percentage of principal payment due at end of term             95.00%            
Line of credit | 2017 Credit Facility matures January 2023                          
Debt Instrument [Line Items]                          
Net loss due to reduction of aggregate principal amount                       $ 700,000  
Borrowings on credit facilities       $ 100,000,000.0                  
Borrowings outstanding or letters of credit issued               545,000,000.0   545,000,000.0      
Secured loan | 2019 Seller Loan                          
Debt Instrument [Line Items]                          
Interest rate     4.25%     4.25%              
Interest rate paid-in-kind     1.25%     1.25%              
Interest rate on first year     8.91%     8.91%              
Repayments of debt $ 48,100,000                        
Secured loan | 2018 Seller Loan                          
Debt Instrument [Line Items]                          
Term of debt instrument             4 years            
Interest rate             4.25%            
Interest rate paid-in-kind             1.25%            
Interest rate on first year             8.91%            
Repayments of debt $ 53,600,000                        
Secured loan | Seller loans                          
Debt Instrument [Line Items]                          
Percentage of principal payment due at end of term       85.00%                  
Debt to total capitalization ratio requirement             0.55            
Covenant, minimum liquidity             $ 300,000,000.0            
Gain (loss) on extinguishment of debt, net               17,800,000   17,200,000      
Senior unsecured notes                          
Debt Instrument [Line Items]                          
Long-term debt               3,400,000,000   3,400,000,000      
Gain (loss) on extinguishment of debt, net         $ 31,300,000                
Purchase of senior notes         440,900,000                
Repurchase amount         $ 400,000,000.0                
Letters of credit | Line of credit | 2017 Credit Facility matures January 2023                          
Debt Instrument [Line Items]                          
Current borrowing capacity               15,000,000.0   15,000,000.0      
Long-term debt               545,000,000.0   545,000,000.0      
Borrowings outstanding or letters of credit issued               8,800,000   8,800,000      
Credit facility | 2015 Credit Facility matures January 2020                          
Debt Instrument [Line Items]                          
Maximum borrowing capacity under credit facilities                         $ 300,000,000.0
Extinguished aggregate principal amount   $ 300,000,000.0                      
Credit facility | Line of credit | 2017 Credit Facility matures January 2023                          
Debt Instrument [Line Items]                          
Credit facility, ability to increase (up to)               500,000,000.0   $ 500,000,000.0      
Credit facility | Line of credit | 2017 Credit Facility matures January 2023 | LIBOR | Maximum                          
Debt Instrument [Line Items]                          
Debt, basis spread on variable rate                   4.25%      
Letters of credit and surety bonds | Line of credit                          
Debt Instrument [Line Items]                          
Borrowings outstanding or letters of credit issued               $ 5,800,000   $ 5,800,000