Guarantor Subsidiaries, Condensed Statement of Cash Flows (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	$ 459,350	$ 499,677	$ 840,386
Cash Provided by (Used in) Operating Activities, Discontinued Operations	9,935	6,172	96,390
Net Cash Provided by Operating Activities	469,285	505,849	936,776
Investing Activities:
Capital Expenditures	(226,820)	(982,934)	(1,459,452)
Proceeds from Divestiture of Interest in Joint Venture	213,295	0	0
Proceeds from Sales of Assets	59,902	110,571	356,836
Net Investment in Equity Affiliates	73,743	(84,221)	95,207
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	120,120	(956,584)	(1,007,409)
Cash Provided by (Used in) Investing Activities, Discontinued Operations	367,251	(39,633)	(33,973)
Net Cash Used in Investing Activities	487,371	(996,217)	(1,041,382)
Financing Activities:
Proceeds from (Repayments of) Debt		(4,282)
Payments On Long Term Notes Including Redemption Premium	0	(1,263,719)	(1,819,005)
Proceeds from Issuance of Long-Term Notes	0	492,760	1,859,920
Proceeds from Contributions from Parent	0		0
Payments for Repurchase of Initial Public Offering		0
Proceeds from Collection of Advance to Affiliate		0
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities	0	208	2,629
Dividends Paid	(2,294)	(33,281)	(57,506)
(Payments on) Proceeds from Short-Term Borrowings	(952,000)	952,000	(11,736)
Repayments of Other Debt	8,312	4,282	10,286
Proceeds from Issuance of Common Stock	4	8,288	15,016
Other Financing Activities			0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	(968,741)	386,013	(45,829)
Cash Provided by (Used in) Financing Activities, Discontinued Operations	(14)	(56)	0
Net Cash (Used in) Provided by Financing Activities	(968,755)	385,957	(45,829)
Net Proceeds from Revolver - MLP	16,000	185,000	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(21,657)	(5,060)	0
Proceeds from Sale of Interest in Partnership Unit	0
Proceeds from Noncontrolling Interests	0	148,359	0
Treasury Stock, Value, Acquired, Cost Method	0	(71,674)	0
Payments of Debt Issuance Costs	(482)	(22,586)	(24,861)
Parent Company [Member]
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	943,652	(153,930)	(178,921)
Cash Provided by (Used in) Operating Activities, Discontinued Operations	0	0	0
Net Cash Provided by Operating Activities	943,652	(153,930)	(178,921)
Investing Activities:
Capital Expenditures	(2,990)	(9,752)	(4,420)
Proceeds from Divestiture of Interest in Joint Venture	0
Proceeds from Sales of Assets	0	142	44,049
Net Investment in Equity Affiliates	0	0	0
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	(2,990)	(9,610)	39,629
Cash Provided by (Used in) Investing Activities, Discontinued Operations	0	0	0
Net Cash Used in Investing Activities	(2,990)	(9,610)	39,629
Financing Activities:
Proceeds from (Repayments of) Debt		(1,281)
Payments On Long Term Notes Including Redemption Premium		(1,263,719)	(1,819,005)
Proceeds from Issuance of Long-Term Notes		492,760	1,859,920
Proceeds from Contributions from Parent	0		0
Payments for Repurchase of Initial Public Offering		0
Proceeds from Collection of Advance to Affiliate		0
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities		208	2,629
Dividends Paid	(2,294)	(33,281)	(57,506)
(Payments on) Proceeds from Short-Term Borrowings	(952,000)	952,000	(11,736)
Repayments of Other Debt	1,645		399
Proceeds from Issuance of Common Stock	4	8,288	15,016
Other Financing Activities			0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	(955,935)	83,301
Cash Provided by (Used in) Financing Activities, Discontinued Operations	0	0
Net Cash (Used in) Provided by Financing Activities	(955,935)	83,301	(35,942)
Net Proceeds from Revolver - MLP	0	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	0	0
Proceeds from Sale of Interest in Partnership Unit	0
Proceeds from Noncontrolling Interests		0
Treasury Stock, Value, Acquired, Cost Method		(71,674)
Payments of Debt Issuance Costs	0		(24,861)
Payments of Financing Costs		0
Cnx Gas Guarantor [Member]
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	(165,861)	624,788	567,851
Cash Provided by (Used in) Operating Activities, Discontinued Operations	0	0	0
Net Cash Provided by Operating Activities	(165,861)	624,788	567,851
Investing Activities:
Capital Expenditures	(165,101)	(832,446)	(1,103,656)
Proceeds from Divestiture of Interest in Joint Venture	213,295
Proceeds from Sales of Assets	44,710	10,298	92,507
Net Investment in Equity Affiliates	79,103	(79,756)	85,248
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	172,007	(901,904)	(925,901)
Cash Provided by (Used in) Investing Activities, Discontinued Operations	0	0	0
Net Cash Used in Investing Activities	172,007	(901,904)	(925,901)
Financing Activities:
Proceeds from (Repayments of) Debt		(6,391)
Payments On Long Term Notes Including Redemption Premium		0	0
Proceeds from Issuance of Long-Term Notes		0	0
Proceeds from Contributions from Parent	0		0
Payments for Repurchase of Initial Public Offering		0
Proceeds from Collection of Advance to Affiliate		0
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities		0	0
Dividends Paid	0	0	0
(Payments on) Proceeds from Short-Term Borrowings	0	252,900	0
Repayments of Other Debt	6,138		(387,663)
Proceeds from Issuance of Common Stock	0	0	0
Other Financing Activities			(5,169)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	(6,138)	246,509
Cash Provided by (Used in) Financing Activities, Discontinued Operations	0	0
Net Cash (Used in) Provided by Financing Activities	(6,138)	246,509	382,494
Net Proceeds from Revolver - MLP	0	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	0	0
Proceeds from Sale of Interest in Partnership Unit	0
Proceeds from Noncontrolling Interests		0
Treasury Stock, Value, Acquired, Cost Method		0
Payments of Debt Issuance Costs	0		0
Payments of Financing Costs		0
Other Guarantors Subsidiaries [Member]
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	58,648	21,906	(4,086)
Cash Provided by (Used in) Operating Activities, Discontinued Operations	0	0	0
Net Cash Provided by Operating Activities	58,648	21,906	(4,086)
Investing Activities:
Capital Expenditures	(46,025)	(106,663)	(266,300)
Proceeds from Divestiture of Interest in Joint Venture	0
Proceeds from Sales of Assets	15,169	100,060	201,221
Net Investment in Equity Affiliates	(5,360)	(4,465)	9,959
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	(14,716)	(11,068)	(55,120)
Cash Provided by (Used in) Investing Activities, Discontinued Operations	0	0	0
Net Cash Used in Investing Activities	(14,716)	(11,068)	(55,120)
Financing Activities:
Proceeds from (Repayments of) Debt		3,443
Payments On Long Term Notes Including Redemption Premium		0	0
Proceeds from Issuance of Long-Term Notes		0	0
Proceeds from Contributions from Parent	0		0
Payments for Repurchase of Initial Public Offering		0
Proceeds from Collection of Advance to Affiliate		0
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities		0	0
Dividends Paid	0	0	0
(Payments on) Proceeds from Short-Term Borrowings	0	0	0
Repayments of Other Debt	450		7,233
Proceeds from Issuance of Common Stock	0	0	0
Other Financing Activities			5,169
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	(932)	(10,838)
Cash Provided by (Used in) Financing Activities, Discontinued Operations	0	0
Net Cash (Used in) Provided by Financing Activities	(932)	(10,838)	(2,064)
Net Proceeds from Revolver - MLP	0	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	0	0
Proceeds from Sale of Interest in Partnership Unit	21,500
Proceeds from Noncontrolling Interests		0
Treasury Stock, Value, Acquired, Cost Method		0
Payments of Debt Issuance Costs	(482)		0
Payments of Financing Costs		(14,281)
Non-Guarantor Subsidiaries [Member]
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	(377,257)	33,422	(59,441)
Cash Provided by (Used in) Operating Activities, Discontinued Operations	9,935	6,172	96,390
Net Cash Provided by Operating Activities	(367,322)	39,594	36,949
Investing Activities:
Capital Expenditures	0	0	0
Proceeds from Divestiture of Interest in Joint Venture	0
Proceeds from Sales of Assets	0	0	13
Net Investment in Equity Affiliates	0	0	0
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	0	0	13
Cash Provided by (Used in) Investing Activities, Discontinued Operations	367,251	(39,633)	(33,973)
Net Cash Used in Investing Activities	367,251	(39,633)	(33,960)
Financing Activities:
Proceeds from (Repayments of) Debt		0
Payments On Long Term Notes Including Redemption Premium		0	0
Proceeds from Issuance of Long-Term Notes		0	0
Proceeds from Contributions from Parent	0		0
Payments for Repurchase of Initial Public Offering		0
Proceeds from Collection of Advance to Affiliate		0
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities		0	0
Dividends Paid	0	0	0
(Payments on) Proceeds from Short-Term Borrowings	0	0	0
Repayments of Other Debt	0		2,630
Proceeds from Issuance of Common Stock	0	0	0
Other Financing Activities			0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	0	0
Cash Provided by (Used in) Financing Activities, Discontinued Operations	(14)	(56)
Net Cash (Used in) Provided by Financing Activities	(14)	(56)	(2,630)
Net Proceeds from Revolver - MLP	0	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	0	0
Proceeds from Sale of Interest in Partnership Unit	0
Proceeds from Noncontrolling Interests		0
Treasury Stock, Value, Acquired, Cost Method		0
Payments of Debt Issuance Costs	0		0
Payments of Financing Costs		0
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	73,098	76,908	142,636
Cash Provided by (Used in) Operating Activities, Discontinued Operations	0	0	0
Net Cash Provided by Operating Activities	73,098	76,908	142,636
Investing Activities:
Capital Expenditures	(12,704)	(34,073)	(85,076)
Proceeds from Divestiture of Interest in Joint Venture	0
Proceeds from Sales of Assets	23	71	19,046
Net Investment in Equity Affiliates	0	0	0
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	(34,181)	(34,002)	(66,030)
Cash Provided by (Used in) Investing Activities, Discontinued Operations	0	0	0
Net Cash Used in Investing Activities	(34,181)	(34,002)	(66,030)
Financing Activities:
Proceeds from (Repayments of) Debt		(53)
Payments On Long Term Notes Including Redemption Premium		(10,951)	(2,311)
Proceeds from Issuance of Long-Term Notes		16,990	14,214
Proceeds from Contributions from Parent	(8,953)		(88,485)
Payments for Repurchase of Initial Public Offering		(342,711)
Proceeds from Collection of Advance to Affiliate		(17,328)
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities		0	0
Dividends Paid	0	0	0
(Payments on) Proceeds from Short-Term Borrowings	0	0	0
Repayments of Other Debt	79		24
Proceeds from Issuance of Common Stock	0	0	0
Other Financing Activities			0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	(35,666)	(36,376)
Cash Provided by (Used in) Financing Activities, Discontinued Operations	0	0
Net Cash (Used in) Provided by Financing Activities	(35,666)	(36,376)	(76,606)
Net Proceeds from Revolver - MLP	16,000	185,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(42,634)	(11,353)
Proceeds from Sale of Interest in Partnership Unit	(21,500)
Proceeds from Noncontrolling Interests		148,359
Treasury Stock, Value, Acquired, Cost Method		0
Payments of Debt Issuance Costs	0		0
Payments of Financing Costs		(4,329)
Consolidation, Eliminations [Member]
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	(72,930)	(103,417)	372,347
Cash Provided by (Used in) Operating Activities, Discontinued Operations	0	0	0
Net Cash Provided by Operating Activities	(72,930)	(103,417)	372,347
Investing Activities:
Capital Expenditures	0	0	0
Proceeds from Divestiture of Interest in Joint Venture	0
Proceeds from Sales of Assets	0	0	0
Net Investment in Equity Affiliates	0	0	0
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	0	0	0
Cash Provided by (Used in) Investing Activities, Discontinued Operations	0	0	0
Net Cash Used in Investing Activities	0	0	0
Financing Activities:
Proceeds from (Repayments of) Debt		0
Payments On Long Term Notes Including Redemption Premium		10,951	2,311
Proceeds from Issuance of Long-Term Notes		(16,990)	(14,214)
Proceeds from Contributions from Parent	8,953		88,485
Payments for Repurchase of Initial Public Offering		342,711
Proceeds from Collection of Advance to Affiliate		17,328
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities		0	0
Dividends Paid	0	0	0
(Payments on) Proceeds from Short-Term Borrowings	0	(252,900)	0
Repayments of Other Debt	0		387,663
Proceeds from Issuance of Common Stock	0	0	0
Other Financing Activities			0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	29,930	103,417
Cash Provided by (Used in) Financing Activities, Discontinued Operations	0	0
Net Cash (Used in) Provided by Financing Activities	29,930	103,417	(311,081)
Net Proceeds from Revolver - MLP	0	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	20,977	6,293
Proceeds from Sale of Interest in Partnership Unit	0
Proceeds from Noncontrolling Interests		0
Treasury Stock, Value, Acquired, Cost Method		0
Payments of Debt Issuance Costs	$ 0		$ 0
Payments of Financing Costs		$ (3,976)