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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, 2018 MMcfe MMcf MBbls | Dec. 31, 2017 MMcfe MMcf MBbls | Dec. 31, 2016 MMcfe MMcf MBbls
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves | MMcfe |  | 8,315,535 | 6,914,287 |
Natural Gas |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Beginning Balance | MMcf |  | 10,263,649 | 7,870,416 | 6,277,697
Revisions | MMcf |  | 178,595 | 70,222 | (7,441)
Extensions, discoveries and additions | MMcf |  | 2,269,427 | 2,866,103 | 1,193,154
Purchases | MMcf |  |  | 7,738 | 943,544
Property sales | MMcf |  | (135,884) | (60,278) | (160,727)
Production | MMcf |  | (548,085) | (490,552) | (375,811)
Ending Balance | MMcf |  | 12,027,702 | 10,263,649 | 7,870,416
Proved developed reserves: |  |  |  |
Proved developed reserves | MMcf |  | 6,451,012 | 5,437,674 | 4,352,141
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves | MMcf |  | 5,576,690 | 4,825,975 | 3,518,275
NGLs |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Beginning Balance |  | 763,264 | 630,066 | 549,135
Revisions |  | 84,993 | 83,338 | 41,402
Extensions, discoveries and additions |  | 128,436 | 87,572 | 26,991
Purchases |  |  | 330 | 40,724
Property sales |  | (16,774) | (2,356) | (360)
Production |  | (38,325) | (35,686) | (27,826)
Ending Balance |  | 921,594 | 763,264 | 630,066
Proved developed reserves: |  |  |  |
Proved developed reserves |  | 512,318 | 448,258 | 363,852
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves |  | 409,276 | 315,006 | 266,214
Crude Oil and Condensate |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Beginning Balance |  | 69,854 | 70,252 | 53,193
Revisions |  | 7,197 | (10,555) | 2,471
Extensions, discoveries and additions |  | 17,309 | 15,997 | 6,506
Purchases |  |  | 66 | 11,986
Property sales |  | (4,276) | (1,121) | (295)
Production |  | (4,228) | (4,785) | (3,609)
Ending Balance |  | 85,856 | 69,854 | 70,252
Proved developed reserves: |  |  |  |
Proved developed reserves |  | 38,658 | 36,808 | 39,110
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves |  | 47,198 | 33,046 | 31,143
Natural Gas Equivalents |  |  |  |
Proved developed reserves: |  |  |  |
Proved developed reserves | MMcfe | [1] | 9,756,870 | 8,348,074 | 6,769,908
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves | MMcfe | [1] | 8,315,536 | 6,914,287 | 5,302,414
Beginning Balance | MMcfe | [1] | 15,262,361 | 12,072,322 | 9,891,663
Revisions | MMcfe | [1] | 731,735 | 506,919 | 255,794
Extensions, discoveries and additions | MMcfe | [1] | 3,143,898 | 3,487,519 | 1,394,134
Purchases | MMcfe | [1] |  | 10,116 | 1,259,806
Property sales | MMcfe | [1] | (262,180) | (81,133) | (164,655)
Production | MMcfe | [1] | (803,408) | (733,382) | (564,420)
Ending Balance | MMcfe | [1] | 18,072,406 | 15,262,361 | 12,072,322
[1] | Oil and NGLs 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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