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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Nov. 19, 2020	Nov. 18, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Proved oil and gas properties	$ 770,117			$ 8,724,376
Less: Accumulated depreciation, depletion, amortization and impairment	(12,403)			(3,601,019)
Proved oil and gas properties, net	757,714			5,123,357
Unproved oil and gas properties	40,211			738,662
Other property and equipment	935,950	$ 938,172	$ 1,311,240	1,279,653
Less: Accumulated depreciation and impairment	(5,088)			(163,896)
Other property and equipment, net	930,862			1,115,757
Total property, plant and equipment, net	$ 1,728,787	$ 1,733,419	$ 1,988,076	$ 6,977,776	$ 7,027,109

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Oil and Gas properties with proved reserves under the successful effort method, net of accumulated depreciation, depletion, amortization and impairment.

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Amount of accumulated depreciation, depletion and amortization of oil and gas property carried under the successful effort method. Oil and gas property include, but not limited to, the entity's wells and related equipment and facilities.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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