Summary of Property and Equipment (Detail) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2021 USD ($) $ / bbl	Mar. 31, 2020 USD ($) $ / bbl	Dec. 31, 2020 USD ($)
Property, Plant and Equipment [Abstract]
Proved Oil and Gas Property, Full Cost Method	$ 1,626,435		$ 1,545,910
Unproved Oil and Gas Property, Full Cost Method	63,489		49,935
Oil and Gas Property, Full Cost Method, Gross	1,689,924		1,595,845
Total properties and equipment	1,717,720		1,623,591
Other property and equipment	27,796		27,746
Accumulated depreciation, depletion and amortization	(925,643)		(900,042)
Property and equipment, net (successful efforts method)	792,077		723,549
Unproved Oil and Gas Property excluded	63,500		49,900
Capitalized Costs of Unproved Properties Excluded from Amortization, Period Cost		$ 500	$ 1,200
Undeveloped Leasehold Costs Transferred	7,600	1,400
Capitalized Costs, Proved Properties	700	800
Interest Costs Capitalized	$ 800	$ 700
Amortization Expense Per Physical Unit of Production \| $ / bbl	12.92	16.73
Impairments of oil and gas properties	$ 1,811	$ 0

Proved Oil and Gas Property, Full Cost Method

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Undeveloped Leasehold Costs Transferred

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Unproved Oil and Gas Property, Full Cost Method

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Unproved Oil and Gas Property Excluded from Amortization

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amortization computed on the basis of physical units, with oil and gas converted to a common unit of measure on the basis of their approximate relative energy content.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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The sum of the capitalized costs incurred during the period of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs.

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Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table.

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Amount of interest capitalized during the period.

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Oil and gas properties, gross, carried under the full cost method.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business 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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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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