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Supplemental Gas Data Acreages (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 acre | Dec. 31, 2013
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Gas and Oil Acreage [Line Items] |  |
Unproved Oil and Gas Property, Successful Effort Method | $ 1,540,835 us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod | $ 1,463,406 us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod
Proved Oil and Gas Property, Successful Effort Method | $ 1,768,007 us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod | $ 1,670,404 us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod
Productive Gas Wells, Number of Wells, Gross | 17,044,000 us-gaap_ProductiveGasWellsNumberOfWellsGross |
Gas and Oil Acreage, Undeveloped, Net | 63,801,000 us-gaap_GasAndOilAreaUndevelopedNet |
unproved acreage gross | 4,946,174,000 cnx_UnprovedAcreageGross |
Gas and Oil Acreage, Unproved, Net | 3,933,975,000 cnx_GasAndOilAcreageUnprovedNet |
Total Acreage - Gross | 5,596,726,000 cnx_TotalAcreageGross |
Total Acreage - Net | 4,513,215,000 cnx_TotalAcreageNet |
Productive Gas Wells, Number of Wells, Net | 12,918,000 us-gaap_ProductiveGasWellsNumberOfWellsNet |
Productive Oil Wells, Number of Wells, Gross | 154,000 us-gaap_ProductiveOilWellsNumberOfWellsGross | 34,000 us-gaap_ProductiveOilWellsNumberOfWellsGross
Gas and Oil Area, Developed, Gross | 537,935,000 us-gaap_GasAndOilAreaDevelopedGross |
Gas and Oil Area, Developed, Net | 515,439,000 us-gaap_GasAndOilAreaDevelopedNet |
Gas and Oil Area, Undeveloped, Gross | 112,617,000 us-gaap_GasAndOilAreaUndevelopedGross |

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- Definition Area spaced or assigned to productive wells in which a working interest is owned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 2 -Paragraph 4 -Subparagraph A + Details
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- Definition Fractional interest owned based on working interests or other economic arrangements of area spaced or assigned to productive wells. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 2 -Paragraph 4 -Subparagraph A + Details
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- Definition Lease area in which a working interest is owned and on which wells have not been drilled or completed to a point that would permit the production of commercial quantities of oil and gas regardless of whether or not such area contains proved reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 2 -Paragraph 5 + Details
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- Definition Fractional interest owned based on working interests or other economic arrangements of lease area on which wells have not been drilled or completed to a point that would permit the production of commercial quantities of oil and gas regardless of whether or not such area contains proved reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 2 -Paragraph 5 + Details
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- Definition The total number of producing gas wells and gas wells capable of production, in which the entity owns an undivided working interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 2 -Paragraph 4 -Subparagraph A + Details
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- Definition The total number of producing gas wells and gas wells capable of production, in which the entity owns a fractional working interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 2 -Paragraph 4 -Subparagraph A + Details
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- Definition The total number of producing oil wells and oil wells capable of production, in which the entity owns an undivided working interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 2 -Paragraph 4 -Subparagraph A + Details
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- Definition Oil and Gas properties with proved reserves under the successful effort method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Glossary Proved Properties -URI http://asc.fasb.org/extlink&oid=6522428 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6474861&loc=d3e64746-109465 + Details
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- Definition Oil and Gas properties with unproved reserves under the successful effort method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61926-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -Glossary Unproved Properties -URI http://asc.fasb.org/extlink&oid=6527831 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6474861&loc=d3e64746-109465 + Details
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