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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, 2013 Mcf | Dec. 31, 2012 Mcf | Dec. 31, 2011 Mcf
Reserve Quantities [Line Items] |  |  |  |
Revisions | 449,000,000 | 109,000,000 | 225,000,000 |
Extensions, discoveries and additions | 1,700,000,000 | 1,800,000,000 | 1,500,000,000 |
Proved Undeveloped Reserves: |  |  |  |
Proved undeveloped reserves | 4,009,608,000 | 3,048,068,000 |  |
Natural Gas |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Beginning Balance | 4,792,676,000 | 4,009,676,000 | 3,566,526,000 | [1]
Revisions | 384,825,000 | 76,925,000 | 73,643,000 |
Extensions, discoveries and additions | 853,746,000 | 996,059,000 | 1,304,324,000 |
Purchases |  |  |  |
Property sales | (101,074,000) | (73,429,000) | (777,816,000) |
Production | (264,528,000) | (216,555,000) | (157,001,000) |
Ending Balance | 5,665,645,000 | 4,792,676,000 | 4,009,676,000 |
Proved Developed Reserves: |  |  |  |
Proved developed reserves | 2,797,483,000 | 2,373,604,000 | 1,907,209,000 |
Proved Undeveloped Reserves: |  |  |  |
Proved undeveloped reserves | 2,868,162,000 | 2,419,072,000 | 2,102,467,000 |
NGLs |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Beginning Balance | 240,399 | 142,515 | 122,722 | [1]
Revisions | 7,743 | 3,036 | 18,627 |
Extensions, discoveries and additions | 135,810 | 113,392 | 26,591 |
Purchases |  |  |  |
Property sales | (286) | (11,575) | (19,852) |
Production | (9,254) | (6,969) | (5,573) |
Ending Balance | 374,412 | 240,399 | 142,515 |
Proved Developed Reserves: |  |  |  |
Proved developed reserves | 206,477 | 154,984 | 64,472 |
Proved Undeveloped Reserves: |  |  |  |
Proved undeveloped reserves | 167,935 | 85,415 | 78,043 |
Crude Oil and Condensate |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Beginning Balance | 45,082 | 31,532 | 23,239 | [1]
Revisions | 2,935 | 2,316 | 6,522 |
Extensions, discoveries and additions | 10,723 | 15,131 | 4,915 |
Purchases |  |  |  |
Property sales | (6,553) | (1,046) | (1,176) |
Production | (3,827) | (2,851) | (1,968) |
Ending Balance | 48,360 | 45,082 | 31,532 |
Proved Developed Reserves: |  |  |  |
Proved developed reserves | 26,054 | 25,667 | 17,872 |
Proved Undeveloped Reserves: |  |  |  |
Proved undeveloped reserves | 22,306 | 19,415 | 13,660 |
Natural Gas Equivalents |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Beginning Balance | 6,505,570,000 | 5,053,961,000 | 4,442,290,000 | [1]
Revisions | 448,898,000 | 109,036,000 | 224,542,000 |
Extensions, discoveries and additions | 1,732,944,000 | 1,767,202,000 | 1,493,357,000 |
Purchases |  |  |  |
Property sales | (142,116,000) | (149,153,000) | (903,983,000) |
Production | (343,022,000) | (275,476,000) | (202,245,000) |
Ending Balance | 8,202,274,000 | 6,505,570,000 | 5,053,961,000 |
Proved Developed Reserves: |  |  |  |
Proved developed reserves | 4,192,666,000 | 3,457,502,000 | 2,401,274,000 |
Proved Undeveloped Reserves: |  |  |  |
Proved undeveloped reserves | 4,009,608,000 | 3,048,068,000 | 2,652,687,000 |
[1] | Total proved reserves at December 31, 2010 includes 906,371 Mmcfe related to discontinued operations of which 408,710 Mmcfe is proved undeveloped.

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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=8451039&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=8451039&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=27015464&loc=d3e511914-122862 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph a -Subparagraph 2 -Article 4 + Details
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- Definition Production of proved reserves. + 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=8451039&loc=d3e61831-109447 + Details
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- Definition Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors. + 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 (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61831-109447 + Details
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- Definition Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61797-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61884-109447 + Details
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