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Property, Plant and Equipment Joint Participation Agreements (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Proceeds from Divestiture of Interest in Joint Venture | $ 213,295 | $ 0 | $ 0
Hess [Member] |  |  |
Drilling commitment carry | $ 335,000 |  |

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- Definition Drilling commitment carry - dollars committed to pay by joint venture partner for drill carry + References No definition available. + Details
Name: | cnx_DrillingCommitmentCarry
Namespace Prefix: | cnx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The cash inflow from the sale of an investment interest in a joint venture that the reporting entity has not previously accounted for using consolidation or the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=cnx_HessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |