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Summary of Significant Accounting Policies - Results of Operations for Properties (Detail) - Predecessor - USD ($)
$ in Thousands
 3 Months Ended 7 Months Ended 9 Months Ended
Sep. 30, 2017
Aug. 13, 2018
Sep. 30, 2017
Operations And Summary Of Significant Accounting Policies [Line Items]      
Total oil and gas sales $ 11,079 $ 17,747 $ 36,495
Total operating expenses [1] (11,664) (6,134) (38,262)
Operating income (loss) $ (585) $ 11,613 $ (1,767)
[1] Includes direct operating expenses, depreciation, depletion and amortization and exploration expense and excludes interest and general and administrative expense. No depreciation, depletion and amortization expense has been provided for subsequent to the date the assets were designated as held for sale.