Annual report pursuant to Section 13 and 15(d)

Accounts Receivable and Major Customers - Summary of Accounts Receivable (Detail)

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Accounts Receivable and Major Customers - Summary of Accounts Receivable (Detail) - USD ($)
$ in Thousands
4 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Cost of Goods and Services Sold   $ 23,197 $ 18,626 $ 10,734
Net Income (Loss) Available to Common Stockholders, Basic $ 32,662 70,589 224,785  
Customers   63,165 59,030  
Joint interest partners   6,929 6,404  
Other   674 640  
Accounts Receivable, Gross, Current, Total   70,768 66,074  
Less: Allowance for doubtful accounts   (52) (36)  
Accounts receivable, net of allowance for doubtful accounts   70,716 66,038  
Oil and Gas, Exploration and Production [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenue from contract with customer   434,713 402,485 140,886
Oil and Condensate [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenue from contract with customer   16,589 21,073 10,066
Natural Gas, Production [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenue from contract with customer   $ 17,733 $ 15,972 $ 8,517