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Summary of Significant Accounting Policies - Narrative (Detail)
 5 Months Ended 7 Months Ended 12 Months Ended
May 19, 2020
USD ($)
shares
Nov. 01, 2019
USD ($)
$ / shares
shares
Jul. 16, 2019
USD ($)
$ / shares
shares
Jul. 16, 2019
USD ($)
$ / shares
$ / bbl
$ / Mcf
Aug. 14, 2018
USD ($)
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
customer
Aug. 13, 2018
USD ($)
customer
Dec. 31, 2020
USD ($)
product
customer
segment
$ / shares
shares
Dec. 31, 2019
USD ($)
customer
shares
Dec. 31, 2018
USD ($)
Sep. 30, 2020
USD ($)
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Jones contribution transaction, Shares issued | shares         88,571,429              
Jones contribution transaction, ownership percentage         84.00%              
Assumed 7½% senior notes             $ 0 $ 0 $ 0 $ 446,625,000    
Repayments of outstanding borrowings             1,291,352,000 49,679,000 907,000,000 127,000,000    
Value of common stock shares issued           $ 95,003,000     116,206,000 95,003,000    
Acquisition related fees             0 2,866,000 0 41,010,000    
Management's oil price outlook | $ / bbl       74.80                
Management's gas price outlook | $ / Mcf       3.32                
Annual minimum discount rate       10.00%                
Annual maximum discount rate       25.00%                
Operating revenues             223,621,000 166,630,000 858,195,000 768,689,000    
Operating income             116,031,000 10,822,000 163,032,000 274,886,000    
Allowance for doubtful accounts                 0      
Goodwill           335,897,000     335,897,000 335,897,000    
Operating lease right-of-use assets           $ 3,509,000     3,025,000 3,509,000    
Cash payments for operating leases associated with right-of-use assets                 $ 2,500,000 $ 2,000,000.0    
Operating lease, weighted average remaining term           1 year 11 months 15 days     1 year 6 months 14 days 1 year 11 months 15 days    
Discount rate           5.00%     4.30% 5.00%    
Number of operating segments | segment                 1      
Number of primary products | product                 2      
Contract cash settlement max days                 25 days      
Contract cancellable notice term                 30 days      
Oil and gas sales           $ 120,111,000     $ 125,016,000 $ 120,111,000    
Reimbursements of overhead costs             4,500,000 8,500,000 $ 24,700,000 16,800,000    
Performance multiplier, minimum                 0.00%      
Performance multiplier, maximum                 200.00%      
Warrants for common stock exercise price | $ / shares                 $ 0.01      
Conversion price per share (in dollars per share) | $ / shares     $ 4.00           $ 4.00      
Interest paid in-kind             $ 0 25,004,000 $ 0 $ 0    
Convertible Notes                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Interest paid in-kind               $ 25,000,000.0        
Major Oil and Natural Gas Purchaser                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Number of major customer of oil and gas sales | customer             2 3 4 3    
Major Oil and Natural Gas Purchaser One                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Percentage accounted of oil and gas sales             32.00% 33.00% 19.00% 19.00%    
Major Oil and Natural Gas Purchaser Two                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Percentage accounted of oil and gas sales             18.00% 22.00% 15.00% 16.00%    
Major Oil and Natural Gas Purchaser Three                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Percentage accounted of oil and gas sales               20.00% 15.00% 12.00%    
Major Oil and Natural Gas Purchaser Four                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Percentage accounted of oil and gas sales                 10.00%      
Minimum                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Property and equipment estimated useful lives                 3 years      
Maximum                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Property and equipment estimated useful lives                 31 years 6 months      
Haynesville Shale                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Merger value   $ 42,300,000                    
Pro Forma                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Acquisition related fees                   $ 41,000,000.0 $ 41,000,000.0  
Operating revenues                   $ 1,147,290,000 $ 1,168,585,000  
Common Stock | Haynesville Shale                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Share issue price | $ / shares   $ 6.85                    
Shares issued as consideration | shares   4,500,000                    
Common Stock | Affiliates Controlled By Majority Shareholder Jerry Jones                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Issuance of common stock (in shares) | shares     50,000,000                  
Value of common stock shares issued     $ 300,000,000.0 $ 300,000,000.0                
Convertible Series A Preferred Stock                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Redemption value of convertible preferred stock issued                 $ 210,000,000.0      
Fair value of preferred stock                 200,000,000.0      
Series B Convertible Preferred Stock                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Convertible preferred stock issued/ sold (in shares) | shares     175,000                  
Series B 10% Convertible Preferred Stock | Affiliates Controlled By Majority Shareholder Jerry Jones                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Redemption value of convertible preferred stock issued     $ 175,000,000.0                  
Convertible preferred stock issued/ sold (in shares) | shares     175,000                  
Series A 10% Convertible Preferred Stock                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Redemption value of convertible preferred stock issued     $ 210,000,000.0                  
Convertible preferred stock issued/ sold (in shares) | shares     210,000                  
Fair value of preferred stock     $ 200,000,000.0 200,000,000.0                
Redemption of outstanding shares | shares 210,000                      
Aggregate amount of redemption requirement $ 210,000,000.0                      
Accrued and unpaid dividends $ 2,900,000                      
Covey Park Equity Owners                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Cash received by equity owners of acquire     700,000,000                  
Repayments of outstanding borrowings     380,000,000.0                  
Preferred equity redeemed in merger     153,400,000 153,400,000                
Merger value     2,226,682,000 2,226,682,000               $ 2,225,608,000
Acquisition related fees                 $ 41,000,000.0      
Fair value of asset retirement obligations     $ 5,374,000 $ 5,374,000               $ 5,374,000
Operating revenues           264,400,000            
Operating income           $ 93,000,000.0            
Covey Park Equity Owners | Common Stock                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Issuance of common stock (in shares) | shares     28,833,000                  
Share issue price | $ / shares     $ 5.82 $ 5.82                
Covey Park Equity Owners | Series A and Series B Convertible Preferred Stock                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Aggregate common stock upon conversion | shares                   96,250,000    
Covey Park Equity Owners | Convertible Series A Preferred Stock                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Redemption value of convertible preferred stock issued     $ 210,000,000.0                  
Interest rate on debt instrument                 7.50%      
Aggregate common stock upon conversion | shares                 52,500,000      
Covey Park Equity Owners | Series B Convertible Preferred Stock                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Aggregate common stock upon conversion | shares                 43,750,000      
Covey Park Equity Owners | 7.5% Senior Notes                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Assumed 7½% senior notes     $ 625,000,000.0                  
Covey Park Equity Owners | 7½% Senior Notes Due 2025                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Interest rate on debt instrument     7.50% 7.50%         7.00%      
Bakken Shale Properties                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Oil and gas property cost basis         $ 397,600,000              
Oil and gas property capitalized costs         554,300,000              
Oil and gas property accumulated depletion, depreciation and amortization         $ 156,700,000              
Oil and Gas Properties | Covey Park Equity Owners                        
Operations And Summary Of Significant Accounting Policies [Line Items]                        
Fair value of asset retirement obligations     $ 5,400,000 $ 5,400,000