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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, 2019 MMcfe MMcf MBbls | Dec. 31, 2018 MMcfe MMcf MBbls | Dec. 31, 2017 MMcfe MMcf MBbls
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves | MMcfe |  | 8,289,115 | 8,315,536 |
Natural Gas |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Beginning Balance | MMcf |  | 12,027,702 | 10,263,649 | 7,870,416
Revisions | MMcf |  | 33,122 | 178,595 | 70,222
Extensions, discoveries and additions | MMcf |  | 959,901 | 2,269,427 | 2,866,103
Purchases | MMcf |  |  | 0 | 7,738
Property sales | MMcf |  | (327,634) | (135,884) | (60,278)
Production | MMcf |  | (578,114) | (548,085) | (490,552)
Ending Balance | MMcf |  | 12,114,977 | 12,027,702 | 10,263,649
Proved developed reserves: |  |  |  |
Proved developed reserves | MMcf |  | 6,486,211 | 6,451,012 | 5,437,674
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves | MMcf |  | 5,628,766 | 5,576,690 | 4,825,975
NGLs |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Beginning Balance |  | 921,594 | 763,264 | 630,066
Revisions |  | 57,311 | 84,993 | 83,338
Extensions, discoveries and additions |  | 26,505 | 128,436 | 87,572
Purchases |  |  | 0 | 330
Property sales |  | (28,324) | (16,774) | (2,356)
Production |  | (38,850) | (38,325) | (35,686)
Ending Balance |  | 938,236 | 921,594 | 763,264
Proved developed reserves: |  |  |  |
Proved developed reserves |  | 535,007 | 512,318 | 448,258
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves |  | 403,229 | 409,276 | 315,006
Crude Oil and Condensate |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Beginning Balance |  | 85,856 | 69,854 | 70,252
Revisions |  | (12,320) | 7,197 | (10,555)
Extensions, discoveries and additions |  | 7,057 | 17,309 | 15,997
Purchases |  |  | 0 | 66
Property sales |  | (2,371) | (4,276) | (1,121)
Production |  | (3,690) | (4,228) | (4,785)
Ending Balance |  | 74,532 | 85,856 | 69,854
Proved developed reserves: |  |  |  |
Proved developed reserves |  | 34,369 | 38,658 | 36,808
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves |  | 40,163 | 47,198 | 33,046
Natural Gas Equivalents |  |  |  |
Proved developed reserves: |  |  |  |
Proved developed reserves | MMcfe | [1] | 9,902,468 | 9,756,870 | 8,348,074
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves | MMcfe | [1] | 8,289,115 | 8,315,536 | 6,914,287
Beginning Balance | MMcfe | [1] | 18,072,406 | 15,262,361 | 12,072,322
Revisions | MMcfe | [1] | 303,068 | 731,735 | 506,919
Extensions, discoveries and additions | MMcfe | [1] | 1,161,274 | 3,143,898 | 3,487,519
Purchases | MMcfe | [1] |  | 0 | 10,116
Property sales | MMcfe | [1] | (511,811) | (262,180) | (81,133)
Production | MMcfe | [1] | (833,354) | (803,408) | (733,382)
Ending Balance | MMcfe | [1] | 18,191,583 | 18,072,406 | 15,262,361
[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 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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