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Summary of Significant Accounting Policies - Additional Information (Detail)
1 Months Ended 11 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
counterparty
Nov. 19, 2020
USD ($)
Dec. 31, 2020
USD ($)
counterparty
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Nov. 18, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jan. 01, 2019
USD ($)
Property, Plant and Equipment [Line Items]                
Retained earnings (accumulated deficit) $ (49,912,000) $ 0 $ (49,912,000) $ 554,446,000   $ (3,995,209,000)    
Capitalized interest costs 100,000 6,400,000   12,000,000.0 $ 17,200,000      
Amount of capitalized exploratory well costs that have been capitalized for period greater than one year $ 0   $ 0          
Derivative, number of counterparties | counterparty 8   8          
Past-due receivables from counterparties $ 0   $ 0          
Unrecognized tax benefits 0   0 0        
Operating right-of-use assets 6,083,000 $ 12,463,000 6,083,000 18,497,000   $ 13,260,000    
Operating lease liabilities 4,970,000   4,970,000          
Finance lease assets 3,419,000   3,419,000 $ 6,303,000        
Present value of future lease payments $ 3,530,000   $ 3,530,000          
Accounting Standards Update 2016-02                
Property, Plant and Equipment [Line Items]                
Operating right-of-use assets               $ 31,100,000
Operating lease liabilities               37,100,000
Finance lease assets               6,000,000.0
Present value of future lease payments               $ 6,000,000.0
Cumulative Effect, Period of Adoption, Adjustment                
Property, Plant and Equipment [Line Items]                
Retained earnings (accumulated deficit)             $ (400,000)  
Allowance for credit loss             $ (400,000)  
Minimum                
Property, Plant and Equipment [Line Items]                
Useful life of intangible asset     5 years          
Maximum                
Property, Plant and Equipment [Line Items]                
Useful life of intangible asset     14 years          
Produced and flowback water disposal facilities, natural gas processing plants and pipelines                
Property, Plant and Equipment [Line Items]                
Estimated life of assets     30 years          
Building                
Property, Plant and Equipment [Line Items]                
Estimated life of assets     20 years          
Furniture, software and equipment | Minimum                
Property, Plant and Equipment [Line Items]                
Estimated life of assets     2 years          
Furniture, software and equipment | Maximum                
Property, Plant and Equipment [Line Items]                
Estimated life of assets     7 years