Supplemental Oil and Gas Disclosures - Unaudited - Results of Operations for Oil and Natural Gas Producing Activities (Detail) - USD ($) $ in Thousands	1 Months Ended	11 Months Ended	12 Months Ended
Dec. 31, 2020	Nov. 19, 2020	Dec. 31, 2019	Dec. 31, 2018
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Revenues	$ 119,915	$ 963,419	$ 2,071,744	$ 2,321,947
Oil and gas
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Revenues	86,442	603,585	1,408,771	1,590,024
Production costs	32,903	249,707	464,782	434,801
Depreciation, depletion and amortization		264,822	759,900	613,928
Exploration expenses	0	2,748	6,658	27,432
Rig termination	0	1,279	384	0
Impairment	0	4,800,785	5,389	384,228
Income tax (benefit) expense	9,648	(1,115,276)	40,745	30,770
Results of operations for oil and gas producing activities	$ 31,146	$ (3,600,480)	$ 130,913	$ 98,865

Amount, before tax, of (gain) loss recognized for the (reversal of write-down) write-down to fair value, less cost to sell, of a disposal group. Excludes discontinued operations.

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Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells.

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Costs related to the impairment of oil and gas properties.

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