Supplemental Information On Oil And Gas Exploration And Production Activities (Unaudited) - Narrative (Detail) MMBTU in Thousands, Boe in Thousands, $ in Thousands, MBoe in Millions	12 Months Ended
	Dec. 31, 2021 MMBTU	Dec. 31, 2021 USD ($) MMBTU	Dec. 31, 2021 MMBTU $ / bbl	Dec. 31, 2021 MMBTU $ / MMBTU	Dec. 31, 2021 MMBTU Boe	Dec. 31, 2021 MMBTU MBoe	Dec. 31, 2020 USD ($) MMBTU Boe MBoe $ / bbl $ / MMBTU	Dec. 31, 2019 USD ($) Boe $ / bbl $ / MMBTU
Reserve Quantities [Line Items]
Additions to oil and gas properties | $		$ 599,563					$ 67,848	$ 210,907
Natural gas liquids prices used to value reserves | $ / bbl			30.16				11.61	16.17
Oil prices used to value reserves (in dollars per barrel) | $ / bbl			65.64
Natural gas prices used to value reserves (in dollars per MMBtu) | $ / MMBTU				3.01
Natural gas liquids prices used to value reserves (in dollars per barrel) | $ / bbl			30.16
Proved extensions and discoveries					21,856		860	5,065
Revision to previous estimates					(4,054)		(10,691)	(4,642)
Changes in performance					9,200
Other economic factors					5,500
Positive revision					1,700	10.6
Reclassifications					9,200		11,900
Revisions due to change in price							(2,700)
Changes in reserve due to performance and other economic factors | MBoe							3.9
Sales of minerals in place					8			32
Conversion period of proved undeveloped reserves into proved developed producing reserves	5 years						5 years	5 years
Estimated capital expenditures of proved undeveloped reserves | $		41,100					$ 111,100	$ 103,800
Estimated proved undeveloped reserves, conversions to developed, gross					13,000		28,000	30,000
Estimated proved undeveloped reserves, conversions to developed, net					10,500		17,600	12,300
Estimated conversion of proved undeveloped reserves into proved developed producing reserves					6,700		11,300	9,900
Capital expenditures of proved undeveloped reserves | $		$ 55,100					$ 67,800	$ 111,500
Modified proved undeveloped reserves, conversions to developed, gross					16,000		18,000	32,000
Modified proved undeveloped reserves, conversions to developed, net					13,100		10,300	13,400
Modified conversion of proved undeveloped reserves into proved developed producing reserves					8,300		8,200	10,300
Changes in price offset by revisions					2,900
Development plan							5 years
Remaining revisions of proved undeveloped previous estimate energy							2,100
Extensions and discoveries					20,521			1,230
Revisions					10,389		14,038	3,362
Non-Cancelable Agreement
Reserve Quantities [Line Items]
Holding pipeline capacity | MMBTU	10	10	10	10	10	10	10
Midland Basin
Reserve Quantities [Line Items]
Proved extensions and discoveries					21,900
Henry Hub Spot Price
Reserve Quantities [Line Items]
Unweighted average of first of the month prices of natural gas | $ / MMBTU				3.60			1.99	2.58
West Texas Intermediate Spot Price
Reserve Quantities [Line Items]
Unweighted average of first of the month prices of oil | $ / bbl			66.56				39.57	55.69
New Wells
Reserve Quantities [Line Items]
Additions to oil and gas properties | $		$ 2,200					$ 800	$ 100
Operated Eagle Ford and Non-operated Bakken Properties
Reserve Quantities [Line Items]
Proved extensions and discoveries							860	5,100