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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, 2020 MMcfe MMcf MBbls | Dec. 31, 2019 MMcfe MMcf MBbls | Dec. 31, 2018 MMcfe MMcf MBbls
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves | MMcfe |  | 7,410,574 | 8,289,115 |
Natural Gas |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Beginning Balance | MMcf |  | 12,114,977 | 12,027,702 | 10,263,649
Revisions | MMcf |  | (789,992) | 33,122 | 178,595
Extensions, discoveries and additions | MMcf |  | 1,007,415 | 959,901 | 2,269,427
Property sales | MMcf |  | (609,311) | (327,634) | (135,884)
Production | MMcf |  | (574,529) | (578,114) | (548,085)
Ending Balance | MMcf |  | 11,148,560 | 12,114,977 | 12,027,702
Proved developed reserves: |  |  |  |
Proved developed reserves | MMcf |  | 6,350,057 | 6,486,211 | 6,451,012
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves | MMcf |  | 4,798,503 | 5,628,766 | 5,576,690
NGLs |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Beginning Balance |  | 938,236 | 921,594 | 763,264
Revisions |  | 42,741 | 57,311 | 84,993
Extensions, discoveries and additions |  | 38,298 | 26,505 | 128,436
Property sales |  | (30,317) | (28,324) | (16,774)
Production |  | (37,492) | (38,850) | (38,325)
Ending Balance |  | 951,466 | 938,236 | 921,594
Proved developed reserves: |  |  |  |
Proved developed reserves |  | 550,771 | 535,007 | 512,318
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves |  | 400,695 | 403,229 | 409,276
Crude Oil and Condensate |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Beginning Balance |  | 74,532 | 85,856 | 69,854
Revisions |  | (12,444) | (12,320) | 7,197
Extensions, discoveries and additions |  | 4,512 | 7,057 | 17,309
Property sales |  | (6,145) | (2,371) | (4,276)
Production |  | (2,829) | (3,690) | (4,228)
Ending Balance |  | 57,626 | 74,532 | 85,856
Proved developed reserves: |  |  |  |
Proved developed reserves |  | 22,976 | 34,369 | 38,658
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves |  | 34,650 | 40,163 | 47,198
Natural Gas Equivalents |  |  |  |
Proved developed reserves: |  |  |  |
Proved developed reserves | MMcfe | [1] | 9,792,540 | 9,902,468 | 9,756,870
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves | MMcfe | [1] | 7,410,574 | 8,289,115 | 8,315,536
Beginning Balance | MMcfe | [1] | 18,191,583 | 18,072,406 | 15,262,361
Revisions | MMcfe | [1] | (608,211) | 303,068 | 731,735
Extensions, discoveries and additions | MMcfe | [1] | 1,264,282 | 1,161,274 | 3,143,898
Property sales | MMcfe | [1] | (828,084) | (511,811) | (262,180)
Production | MMcfe | [1] | (816,456) | (833,354) | (803,408)
Ending Balance | MMcfe | [1] | 17,203,114 | 18,191,583 | 18,072,406
[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 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=68064819&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=68064819&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=68064819&loc=d3e61797-109447 + Details
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