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Oil and Gas Reserves Information (Unaudited) - Summary of Changes in Net Quantities of Crude Oil and Natural Gas Reserves (Detail)	12 Months Ended
	Dec. 31, 2021 MMcf MMBbls	Dec. 31, 2020 MMBbls MMcf	Dec. 31, 2019 MMcf MMBbls	Dec. 31, 2018 MMcf MMBbls
Oil (MBbls)
Proved Reserves:
Beginning of period	11,000	16,747	23,612
Revisions of previous estimates	145	(4,241)	(4,621)
Extensions and discoveries	0	2	259
Acquisitions of minerals in place	0	0	240
Sales of minerals in place	(9,308)	0	(58)
Production	(1,210)	(1,508)	(2,685)
End of period	627	11,000	16,747
Proved Developed Reserves:
Proved developed reserves	627	11,000	15,104	21,466
Proved Undeveloped Reserves:
Proved undeveloped reserves	0	0	1,643	2,146
Natural Gas (MMcf)
Proved Reserves:
Beginning of period | MMcf	5,562,876	5,341,497	2,282,758
Revisions of previous estimates | MMcf	88,546	306,552	62,697
Extensions and discoveries | MMcf	797,198	365,663	315,286
Acquisitions of minerals in place	202,588	0	3,023,109
Sales of minerals in place | MMcf	(43,851)	0	(49,520)
Production | MMcf	(489,274)	(450,836)	(292,833)
End of period | MMcf	6,118,083	5,562,876	5,341,497
Proved Developed Reserves:
Proved developed reserves | MMcf	2,245,660	1,967,288	1,890,357	583,107
Proved Undeveloped Reserves:
Proved undeveloped reserves | MMcf	3,872,423	3,595,588	3,451,140	1,699,651

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Proved developed reserves.

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Proved undeveloped reserves.

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Proved undeveloped reserves abstract.

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Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=123377692&loc=d3e61831-109447

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The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123377692&loc=d3e61797-109447

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Production of proved reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=123377692&loc=d3e61831-109447

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Purchase of minerals in place.

+ References

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-Publisher SEC
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
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-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123377692&loc=d3e61831-109447

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Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
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-Subparagraph (a)
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Sales of minerals in place.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
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