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Oil and Gas Reserves Information (Unaudited) - Changes in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Reserves (Detail) - USD ($)
$ in Thousands
 5 Months Ended 7 Months Ended 12 Months Ended
Dec. 31, 2018
Aug. 13, 2018
Dec. 31, 2020
Dec. 31, 2019
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]        
Standardized Measure, Beginning of Year $ 1,317,383   $ 2,913,211 $ 1,473,840
Net change in sales price, net of production costs 223,731   (1,858,026) (716,930)
Development costs incurred during the year which were previously estimated 112,073   302,135 311,331
Revisions of quantity estimates 27,090   215,268 16,340
Accretion of discount 55,692   326,074 175,514
Changes in future development and abandonment costs 23,139   313,191 (93,476)
Changes in timing and other 9,434   (127,663) 180,314
Extensions and discoveries 15,263   180,624 442,099
Acquisitions of minerals in place 54,143   0 1,813,491
Sales of minerals in place (42,870)   0 (51,070)
Sales, net of production costs (181,218)   (612,194) (580,922)
Net changes in income taxes (140,020)   283,105 (57,320)
Standardized Measure, End of Year 1,473,840 $ 1,317,383 $ 1,935,725 $ 2,913,211
Predecessor        
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]        
Standardized Measure, Beginning of Year $ 877,987 881,544    
Net change in sales price, net of production costs   (61,662)    
Development costs incurred during the year which were previously estimated   86,086    
Revisions of quantity estimates   19,815    
Accretion of discount   53,413    
Changes in future development and abandonment costs   (27,489)    
Changes in timing and other   (17,723)    
Extensions and discoveries   167,986    
Acquisitions of minerals in place   72,738    
Sales of minerals in place   (124,083)    
Sales, net of production costs   (129,991)    
Net changes in income taxes   (42,647)    
Standardized Measure, End of Year   $ 877,987