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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, 2017 MMcfe MMcf MBbls | Dec. 31, 2016 MMcfe MMcf MBbls | Dec. 31, 2015 MMcfe MMcf MBbls
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves | MMcfe |  | 6,914,287 | 5,302,414 |
Natural Gas |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Beginning Balance | MMcf |  | 7,870,416 | 6,277,697 | 6,922,836
Revisions | MMcf |  | 70,222 | (7,441) | (340,286)
Extensions, discoveries and additions | MMcf |  | 2,866,103 | 1,193,154 | 1,017,956
Purchases | MMcf |  | 7,738 | 943,544 |
Property sales | MMcf |  | (60,278) | (160,727) | (960,122)
Production | MMcf |  | (490,552) | (375,811) | (362,687)
Ending Balance | MMcf |  | 10,263,649 | 7,870,416 | 6,277,697
Proved developed reserves: |  |  |  |
Proved developed reserves | MMcf |  | 5,437,674 | 4,352,141 | 3,376,165
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves | MMcf |  | 4,825,975 | 3,518,275 | 2,901,533
NGLs |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Beginning Balance |  | 630,066 | 549,135 | 515,907
Revisions |  | 83,338 | 41,402 | 17,717
Extensions, discoveries and additions |  | 87,572 | 26,991 | 36,308
Purchases |  | 330 | 40,724 |
Property sales |  | (2,356) | (360) | (441)
Production |  | (35,686) | (27,826) | (20,356)
Ending Balance |  | 763,264 | 630,066 | 549,135
Proved developed reserves: |  |  |  |
Proved developed reserves |  | 448,258 | 363,852 | 309,306
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves |  | 315,006 | 266,214 | 239,828
Crude Oil and Condensate |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Beginning Balance |  | 70,252 | 53,193 | 48,658
Revisions |  | (10,555) | 2,471 | 3,804
Extensions, discoveries and additions |  | 15,997 | 6,506 | 4,924
Purchases |  | 66 | 11,986 |
Property sales |  | (1,121) | (295) | (109)
Production |  | (4,785) | (3,609) | (4,084)
Ending Balance |  | 69,854 | 70,252 | 53,193
Proved developed reserves: |  |  |  |
Proved developed reserves |  | 36,808 | 39,110 | 31,679
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves |  | 33,046 | 31,143 | 21,514
Natural Gas Equivalents |  |  |  |
Proved developed reserves: |  |  |  |
Proved developed reserves | MMcfe | [1] | 8,348,074 | 6,769,908 | 5,422,075
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves | MMcfe | [1] | 6,914,287 | 5,302,414 | 4,469,588
Beginning Balance | MMcfe | [1] | 12,072,322 | 9,891,663 | 10,310,229
Revisions | MMcfe | [1] | 506,919 | 255,794 | (211,163)
Extensions, discoveries and additions | MMcfe | [1] | 3,487,519 | 1,394,134 | 1,265,348
Purchases | MMcfe | [1] | 10,116 | 1,259,806 |
Property sales | MMcfe | [1] | (81,133) | (164,655) | (963,423)
Production | MMcfe | [1] | (733,382) | (564,420) | (509,328)
Ending Balance | MMcfe | [1] | 15,262,361 | 12,072,322 | 9,891,663
[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 of 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/2003/role/presentationRef -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 Energy measure of decrease in quantity of proved reserve of oil and gas resulting from production, 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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (e) -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/presentationRef -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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61831-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(a)(2)) -URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862 + Details
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