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Supplemental Information on Natural Gas and Oil Exploration, Development and Production Activities (Unaudited) - Proved Developed and Undeveloped Reserves (Detail) | 12 Months Ended
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Dec. 31, 2021 MMcfe MMBbls MMcf | Dec. 31, 2020 MMcfe MMBbls MMcf | Dec. 31, 2019 MMcfe MMcf MMBbls
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves | MMcfe |  | 7,357,597 | 7,410,574 |
Natural Gas |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Beginning Balance | MMcf |  | 11,148,560 | 12,114,977 | 12,027,702
Revisions | MMcf |  | (311,410) | (789,992) | 33,122
Extensions, discoveries and additions | MMcf |  | 1,155,952 | 1,007,415 | 959,901
Property sales | MMcf |  |  | (609,311) | (327,634)
Production | MMcf |  | (541,021) | (574,529) | (578,114)
Ending Balance | MMcf |  | 11,452,081 | 11,148,560 | 12,114,977
Proved developed reserves: |  |  |  |
Proved developed reserves | MMcf |  | 6,809,849 | 6,350,057 | 6,486,211
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves | MMcf |  | 4,642,232 | 4,798,503 | 5,628,766
NGLs |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Beginning Balance |  | 951,466 | 938,236 | 921,594
Revisions |  | 16,845 | 42,741 | 57,311
Extensions, discoveries and additions |  | 69,367 | 38,298 | 26,505
Property sales |  |  | (30,317) | (28,324)
Production |  | (36,373) | (37,492) | (38,850)
Ending Balance |  | 1,001,305 | 951,466 | 938,236
Proved developed reserves: |  |  |  |
Proved developed reserves |  | 577,506 | 550,771 | 535,007
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves |  | 423,798 | 400,695 | 403,229
Crude Oil and Condensate |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Beginning Balance |  | 57,626 | 74,532 | 85,856
Revisions |  | (7,089) | (12,444) | (12,320)
Extensions, discoveries and additions |  | 5,103 | 4,512 | 7,057
Property sales |  |  | (6,145) | (2,371)
Production |  | (3,044) | (2,829) | (3,690)
Ending Balance |  | 52,596 | 57,626 | 74,532
Proved developed reserves: |  |  |  |
Proved developed reserves |  | 23,833 | 22,976 | 34,369
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves |  | 28,762 | 34,650 | 40,163
Natural Gas Equivalents |  |  |  |
Proved developed reserves: |  |  |  |
Proved developed reserves | MMcfe | [1] | 10,417,887 | 9,792,540 | 9,902,468
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves | MMcfe | [1] | 7,357,597 | 7,410,574 | 8,289,115
Beginning Balance | MMcfe | [1] | 17,203,114 | 18,191,583 | 18,072,406
Revisions | MMcfe | [1] | (252,876) | (608,211) | 303,068
Extensions, discoveries and additions | MMcfe | [1] | 1,602,769 | 1,264,282 | 1,161,274
Property sales | MMcfe | [1] |  | (828,084) | (511,811)
Production | MMcfe | [1] | (777,523) | (816,456) | (833,354)
Ending Balance | MMcfe | [1] | 17,775,484 | 17,203,114 | 18,191,583
[1] | Oil and NGLs volumes are converted to mcfe at the rate of one barrel equals six mcf based upon the approximate relative energy content of oil to natural gas, which is not indicative of the relationship between oil and natural gas prices.

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- Definition Proved developed reserve. + References No definition available. + Details
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- Definition Proved undeveloped reserves. + References No definition available. + Details
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- Definition Energy measure of increase in quantity of proved reserve of oil and gas resulting from the extension of the proved acreage of previously discovered reservoir or discovery of new field with proved reserve or of new reservoir of proved reserve in old field, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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- Definition 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 + Details
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- Definition 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 + Details
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