Guarantor Subsidiaries, Condensed Statement of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	$ 205,194	$ 123,662
Cash Provided by (Used in) Operating Activities, Discontinued Operations	(75)	6,290
Net Cash Provided by Operating Activities	205,119	129,952
Investing Activities:
Capital Expenditures	(112,978)	(77,656)
Proceeds from Sale of Productive Assets	19,427	8,453
Payments for (Proceeds from) Businesses and Interest in Affiliates	5,909	(5,578)
Payments for Advance to Affiliate		0
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	(87,642)	(74,781)
Cash Provided by (Used in) Investing Activities, Discontinued Operations	0	395,757
Net Cash Provided by (Used in) Investing Activities	(87,642)	320,976
Financing Activities:
Repayments of Other Debt	(2,942)	(2,095)
(Payments on) Proceeds from Short-Term Borrowings	0	(100,500)
Treasury Stock Activity	(6,278)	(1,510)
Payments of Dividends	0	(2,294)
Noncontrolling Interest, Period Increase (Decrease)	(5,467)	(5,413)
Payments On Long Term Notes Including Redemption Premium	(98,243)	0
Proceeds from Issuance of Common Stock	494	3
Treasury Stock, Value, Acquired, Cost Method	(6,278)
Net Proceeds from Revolver - MLP	(4,000)	15,000
Payments of Debt Issuance Costs	(250)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	(116,686)	(96,809)
Cash Provided by (Used in) Financing Activities, Discontinued Operations	0	(47)
Net Cash (Used in) Provided by Financing Activities	(116,686)	(96,856)
Parent Issuer [Member]
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	109,039	456,851
Cash Provided by (Used in) Operating Activities, Discontinued Operations	0	0
Net Cash Provided by Operating Activities	109,039	456,851
Investing Activities:
Capital Expenditures	(1,087)	(1,281)
Proceeds from Sale of Productive Assets	0	0
Payments for (Proceeds from) Businesses and Interest in Affiliates	0	0
Payments for Advance to Affiliate		0
Net Cash Provided by (Used in) Investing Activities, Continuing Operations		(1,281)
Cash Provided by (Used in) Investing Activities, Discontinued Operations		0
Net Cash Provided by (Used in) Investing Activities	(1,087)	(1,281)
Financing Activities:
Repayments of Other Debt	(418)	(353)
(Payments on) Proceeds from Short-Term Borrowings		(100,500)
Treasury Stock Activity		(1,510)
Payments of Dividends		(2,294)
Noncontrolling Interest, Period Increase (Decrease)	0	0
Payments On Long Term Notes Including Redemption Premium	(98,243)
Proceeds from Issuance of Common Stock	494	3
Treasury Stock, Value, Acquired, Cost Method	(5,471)
Net Proceeds from Revolver - MLP	0	0
Payments of Debt Issuance Costs	250
Net Cash Provided by (Used in) Financing Activities, Continuing Operations		(104,654)
Cash Provided by (Used in) Financing Activities, Discontinued Operations		0
Net Cash (Used in) Provided by Financing Activities	(103,888)	(104,654)
CNX Gas Guarantor [Member]
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	87,898	58,594
Cash Provided by (Used in) Operating Activities, Discontinued Operations	0	0
Net Cash Provided by Operating Activities	87,898	58,594
Investing Activities:
Capital Expenditures	(100,793)	(62,862)
Proceeds from Sale of Productive Assets	8,518	7,953
Payments for (Proceeds from) Businesses and Interest in Affiliates	5,909	(2,145)
Payments for Advance to Affiliate		0
Net Cash Provided by (Used in) Investing Activities, Continuing Operations		(57,054)
Cash Provided by (Used in) Investing Activities, Discontinued Operations		0
Net Cash Provided by (Used in) Investing Activities	(86,366)	(57,054)
Financing Activities:
Repayments of Other Debt	(1,530)	(1,537)
(Payments on) Proceeds from Short-Term Borrowings		0
Treasury Stock Activity		0
Payments of Dividends		0
Noncontrolling Interest, Period Increase (Decrease)	0	0
Payments On Long Term Notes Including Redemption Premium	0
Proceeds from Issuance of Common Stock	0	0
Treasury Stock, Value, Acquired, Cost Method	0
Net Proceeds from Revolver - MLP	0	0
Payments of Debt Issuance Costs	0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations		(1,537)
Cash Provided by (Used in) Financing Activities, Discontinued Operations		0
Net Cash (Used in) Provided by Financing Activities	(1,530)	(1,537)
Other Guarantors Subsidiaries [Member]
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	(873)	13,434
Cash Provided by (Used in) Operating Activities, Discontinued Operations	0	0
Net Cash Provided by Operating Activities	(873)	13,434
Investing Activities:
Capital Expenditures	(9,068)	(10,288)
Proceeds from Sale of Productive Assets	10,909	480
Payments for (Proceeds from) Businesses and Interest in Affiliates	0	(3,433)
Payments for Advance to Affiliate		0
Net Cash Provided by (Used in) Investing Activities, Continuing Operations		(13,241)
Cash Provided by (Used in) Investing Activities, Discontinued Operations		0
Net Cash Provided by (Used in) Investing Activities	1,841	(13,241)
Financing Activities:
Repayments of Other Debt	(968)	(193)
(Payments on) Proceeds from Short-Term Borrowings		0
Treasury Stock Activity		0
Payments of Dividends		0
Noncontrolling Interest, Period Increase (Decrease)	0	0
Payments On Long Term Notes Including Redemption Premium	0
Proceeds from Issuance of Common Stock	0	0
Treasury Stock, Value, Acquired, Cost Method	0
Net Proceeds from Revolver - MLP	0	0
Payments of Debt Issuance Costs	0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations		(193)
Cash Provided by (Used in) Financing Activities, Discontinued Operations		0
Net Cash (Used in) Provided by Financing Activities	(968)	(193)
CNX Coal Resources LP [Member]
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	17,662	3,511
Cash Provided by (Used in) Operating Activities, Discontinued Operations	0	0
Net Cash Provided by Operating Activities	17,662	3,511
Investing Activities:
Capital Expenditures	(2,030)	(3,225)
Proceeds from Sale of Productive Assets	0	20
Payments for (Proceeds from) Businesses and Interest in Affiliates	0	0
Net Cash Provided by (Used in) Investing Activities, Continuing Operations		(3,205)
Cash Provided by (Used in) Investing Activities, Discontinued Operations		0
Net Cash Provided by (Used in) Investing Activities	(2,030)	(3,205)
Financing Activities:
Repayments of Other Debt	(26)	(12)
(Payments on) Proceeds from Short-Term Borrowings		0
Treasury Stock Activity		0
Payments of Dividends		0
Noncontrolling Interest, Period Increase (Decrease)	(14,050)	(12,144)
Proceeds from Collection of Advance to Affiliate		(550)
Payments On Long Term Notes Including Redemption Premium	0
Proceeds from Issuance of Common Stock	0	0
Treasury Stock, Value, Acquired, Cost Method	(807)
Net Proceeds from Revolver - MLP	(4,000)	15,000
Payments of Debt Issuance Costs	0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations		(2,294)
Cash Provided by (Used in) Financing Activities, Discontinued Operations		0
Net Cash (Used in) Provided by Financing Activities	(18,883)	2,294
Non-Guarantors [Member]
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	51	(401,447)
Cash Provided by (Used in) Operating Activities, Discontinued Operations	(75)	6,290
Net Cash Provided by Operating Activities	(24)	(395,157)
Investing Activities:
Capital Expenditures	0	0
Proceeds from Sale of Productive Assets	0	0
Payments for (Proceeds from) Businesses and Interest in Affiliates	0	0
Payments for Advance to Affiliate		0
Net Cash Provided by (Used in) Investing Activities, Continuing Operations		0
Cash Provided by (Used in) Investing Activities, Discontinued Operations		395,757
Net Cash Provided by (Used in) Investing Activities	0	395,757
Financing Activities:
Repayments of Other Debt	0	0
(Payments on) Proceeds from Short-Term Borrowings		0
Treasury Stock Activity		0
Payments of Dividends		0
Noncontrolling Interest, Period Increase (Decrease)	0	0
Payments On Long Term Notes Including Redemption Premium	0
Proceeds from Issuance of Common Stock	0	0
Treasury Stock, Value, Acquired, Cost Method
Net Proceeds from Revolver - MLP	0	0
Payments of Debt Issuance Costs	0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations		0
Cash Provided by (Used in) Financing Activities, Discontinued Operations		(47)
Net Cash (Used in) Provided by Financing Activities	0	(47)
Consolidation, Eliminations [Member]
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	(8,583)	(7,281)
Cash Provided by (Used in) Operating Activities, Discontinued Operations	0	0
Net Cash Provided by Operating Activities	(8,583)	(7,281)
Investing Activities:
Capital Expenditures	0	0
Proceeds from Sale of Productive Assets	0	0
Payments for (Proceeds from) Businesses and Interest in Affiliates	0	0
Net Cash Provided by (Used in) Investing Activities, Continuing Operations		0
Cash Provided by (Used in) Investing Activities, Discontinued Operations		0
Net Cash Provided by (Used in) Investing Activities	0	0
Financing Activities:
Repayments of Other Debt	0	0
(Payments on) Proceeds from Short-Term Borrowings		0
Treasury Stock Activity		0
Payments of Dividends		0
Noncontrolling Interest, Period Increase (Decrease)	8,583	6,731
Proceeds from Collection of Advance to Affiliate		550
Payments On Long Term Notes Including Redemption Premium	0
Proceeds from Issuance of Common Stock	0	0
Treasury Stock, Value, Acquired, Cost Method
Net Proceeds from Revolver - MLP	0	0
Payments of Debt Issuance Costs	0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations		7,281
Cash Provided by (Used in) Financing Activities, Discontinued Operations		0
Net Cash (Used in) Provided by Financing Activities	$ 8,583	$ 7,281

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