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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, 2016 MMcfe MMcf MBbls | Dec. 31, 2015 MMcfe MMcf MBbls | Dec. 31, 2014 MMcfe MMcf MBbls
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves | MMcfe |  | 5,302,414 | 4,469,588 |
Natural Gas |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Beginning Balance | MMcf |  | 6,277,697 | 6,922,836 | 5,665,645
Revisions | MMcf |  | (7,441) | (340,286) | (30,566)
Extensions, discoveries and additions | MMcf |  | 1,193,154 | 1,017,956 | 1,393,108
Purchases | MMcf |  | 943,544 | 0 | 262,813
Property sales | MMcf |  | (160,727) | (960,122) | (81,238)
Production | MMcf |  | (375,811) | (362,687) | (286,926)
Ending Balance | MMcf |  | 7,870,416 | 6,277,697 | 6,922,836
Proved developed reserves: |  |  |  |
Proved developed reserves | MMcf |  | 4,352,141 | 3,376,165 | 3,583,051
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves | MMcf |  | 3,518,275 | 2,901,533 | 3,339,785
NGLs |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Beginning Balance |  | 549,135 | 515,907 | 374,412
Revisions |  | 41,402 | 17,717 | 19,716
Extensions, discoveries and additions |  | 26,991 | 36,308 | 154,664
Purchases |  | 40,724 | 0 | 0
Property sales |  | (360) | (441) | (14,064)
Production |  | (27,826) | (20,356) | (18,821)
Ending Balance |  | 630,066 | 549,135 | 515,907
Proved developed reserves: |  |  |  |
Proved developed reserves |  | 363,852 | 309,306 | 270,271
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves |  | 266,214 | 239,828 | 245,636
Crude Oil and Condensate |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Beginning Balance |  | 53,193 | 48,658 | 48,360
Revisions |  | 2,471 | 3,804 | 515
Extensions, discoveries and additions |  | 6,506 | 4,924 | 12,936
Purchases |  | 11,986 | 0 | 0
Property sales |  | (295) | (109) | (9,083)
Production |  | (3,609) | (4,084) | (4,070)
Ending Balance |  | 70,252 | 53,193 | 48,658
Proved developed reserves: |  |  |  |
Proved developed reserves |  | 39,110 | 31,679 | 24,180
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves |  | 31,143 | 21,514 | 24,478
Natural Gas Equivalents |  |  |  |
Proved developed reserves: |  |  |  |
Proved developed reserves | MMcfe | [1] | 6,769,908 | 5,422,075 | 5,349,761
Proved undeveloped reserves: |  |  |  |
Proved undeveloped reserves | MMcfe | [1] | 5,302,414 | 4,469,588 | 4,960,468
Beginning Balance | MMcfe | [1] | 9,891,663 | 10,310,229 | 8,202,274
Revisions | MMcfe | [1] | 255,794 | (211,163) | 90,822
Extensions, discoveries and additions | MMcfe | [1] | 1,394,134 | 1,265,348 | 2,398,709
Purchases | MMcfe | [1] | 1,259,806 | 0 | 262,813
Property sales | MMcfe | [1] | (164,655) | (963,423) | (220,122)
Production | MMcfe | [1] | (564,420) | (509,328) | (424,267)
Ending Balance | MMcfe | [1] | 12,072,322 | 9,891,663 | 10,310,229
[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 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=50486907&loc=d3e511914-122862 + Details
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