Guarantor Subsidiaries, Condensed Statement of Cash Flows (Detail) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	$ 970,706,000	$ 553,570,000	$ 457,342,000
Cash Provided by (Used in) Operating Activities, Discontinued Operations	(33,926,000)	105,206,000	270,771,000
Net Cash Provided by Operating Activities	936,780,000	658,776,000	728,113,000
Investing Activities:
Capital Expenditures	(1,493,425,000)	(1,496,056,000)	(1,245,497,000)
Proceeds from Sales of Assets	356,836,000	483,969,000	645,621,000
Increase (Decrease) in Restricted Cash	0	68,673,000	(48,294,000)
Net Investment in Equity Affiliates	95,207,000	(35,712,000)	(23,451,000)
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	(1,041,382,000)	(979,126,000)	(671,621,000)
Cash Provided by (Used in) Investing Activities, Discontinued Operations	0	777,145,000	(328,789,000)
Net Cash Used in Investing Activities	(1,041,382,000)	(201,981,000)	(1,000,410,000)
Financing Activities:
Repayments of Other Debt	(22,022,000)us-gaap_RepaymentsOfOtherDebt	(31,544,000)us-gaap_RepaymentsOfOtherDebt	16,195,000us-gaap_RepaymentsOfOtherDebt
Payments On Long Term Notes Including Redemption Premium	1,843,866,000	0	0
Proceeds from Issuance of Long-Term Notes	1,859,920,000	0	0
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities	2,629,000	2,929,000	8,678,000
Payments on Securitzation Facility	0	(37,846,000)	37,846,000
Dividends Paid	(57,506,000)us-gaap_PaymentsOfDividends	(85,832,000)us-gaap_PaymentsOfDividends	(142,278,000)us-gaap_PaymentsOfDividends
(Payments on) Proceeds from Short-Term Borrowings		0
Proceeds from Issuance of Common Stock	15,016,000	3,727,000	8,278,000
Proceeds from Issuance of Common Stock		3,727,000
Other Financing Activities	0	778,000	53,024,000
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	(45,829,000)	(150,717,000)	(80,976,000)
Cash Provided by (Used in) Financing Activities, Discontinued Operations	0	(520,000)	(601,000)
Net Cash (Used in) Provided by Financing Activities	(45,829,000)	(151,237,000)	(81,577,000)
Parent Issuer
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	(178,921,000)	51,093,000	(58,410,000)
Cash Provided by (Used in) Operating Activities, Discontinued Operations	0	0	0
Net Cash Provided by Operating Activities	(178,921,000)	51,093,000	(58,410,000)
Investing Activities:
Capital Expenditures	4,420,000	68,796,000	49,973,000
Proceeds from Sales of Assets	44,049,000	327,964,000	0
Increase (Decrease) in Restricted Cash		0	0
Net Investment in Equity Affiliates	0	0	(200,000,000)
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	39,629,000	259,168,000	150,027,000
Cash Provided by (Used in) Investing Activities, Discontinued Operations		0	0
Net Cash Used in Investing Activities		259,168,000	150,027,000
Financing Activities:
Repayments of Other Debt	12,135,000	25,952,000
Payments On Long Term Notes Including Redemption Premium	1,843,866,000
Proceeds from Issuance of Long-Term Notes	1,859,920,000
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities	2,629,000
Payments on Securitzation Facility		0
Dividends Paid	57,506,000	(14,168,000)	142,278,000
(Payments on) Proceeds from Short-Term Borrowings		0
Proceeds from Issuance of Common Stock	15,016,000		8,278,000
Proceeds from Issuance of Common Stock		3,727,000
Other Financing Activities	0	778,000	22,532,000
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	(35,942,000)	(7,279,000)	(111,468,000)
Cash Provided by (Used in) Financing Activities, Discontinued Operations		0	0
Net Cash (Used in) Provided by Financing Activities		(7,279,000)	(111,468,000)
Cnx Gas Guarantor [Member]
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	567,851,000	440,763,000	82,036,000
Cash Provided by (Used in) Operating Activities, Discontinued Operations	0	0	0
Net Cash Provided by Operating Activities	567,851,000	440,763,000	82,036,000
Investing Activities:
Capital Expenditures	1,103,656,000	968,607,000	532,636,000
Proceeds from Sales of Assets	92,507,000	350,975,000	360,129,000
Increase (Decrease) in Restricted Cash		0	0
Net Investment in Equity Affiliates	(85,248,000)	47,500,000	37,400,000
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	(925,901,000)	(665,132,000)	(209,907,000)
Cash Provided by (Used in) Investing Activities, Discontinued Operations		0	0
Net Cash Used in Investing Activities		(665,132,000)	(209,907,000)
Financing Activities:
Repayments of Other Debt	(387,663,000)	0
Payments On Long Term Notes Including Redemption Premium	0
Proceeds from Issuance of Long-Term Notes	0
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities	0
Payments on Securitzation Facility		0
Dividends Paid	0	100,000,000	200,000,000
(Payments on) Proceeds from Short-Term Borrowings		332,487,000
Proceeds from Issuance of Common Stock	0		0
Proceeds from Issuance of Common Stock		0
Other Financing Activities	(5,169,000)	(5,232,000)	(5,504,000)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	382,494,000	227,255,000	(205,504,000)
Cash Provided by (Used in) Financing Activities, Discontinued Operations		0	0
Net Cash (Used in) Provided by Financing Activities		227,255,000	(205,504,000)
Other Subsidiary Guarantors
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	157,211,000	572,683,000	412,293,000
Cash Provided by (Used in) Operating Activities, Discontinued Operations	0	0	0
Net Cash Provided by Operating Activities	157,211,000	572,683,000	412,293,000
Investing Activities:
Capital Expenditures	385,349,000	458,653,000	662,888,000
Proceeds from Sales of Assets	220,267,000	(195,082,000)	285,238,000
Increase (Decrease) in Restricted Cash		(68,673,000)	48,294,000
Net Investment in Equity Affiliates	(9,959,000)	(11,788,000)	(13,949,000)
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	(155,123,000)	(573,274,000)	(411,995,000)
Cash Provided by (Used in) Investing Activities, Discontinued Operations		0	0
Net Cash Used in Investing Activities		(573,274,000)	(411,995,000)
Financing Activities:
Repayments of Other Debt	7,257,000	4,800,000
Payments On Long Term Notes Including Redemption Premium	0
Proceeds from Issuance of Long-Term Notes	0
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities	0
Payments on Securitzation Facility		0
Dividends Paid	0	0	0
(Payments on) Proceeds from Short-Term Borrowings		0
Proceeds from Issuance of Common Stock	0		0
Proceeds from Issuance of Common Stock		0
Other Financing Activities	5,169,000	5,232,000	(1,408,000)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	(2,088,000)	432,000	(1,408,000)
Cash Provided by (Used in) Financing Activities, Discontinued Operations		0	0
Net Cash (Used in) Provided by Financing Activities		432,000	(1,408,000)
Non-Guarantors
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	36,902,000	(843,456,000)	21,423,000
Cash Provided by (Used in) Operating Activities, Discontinued Operations	(33,926,000)	105,206,000	270,771,000
Net Cash Provided by Operating Activities	2,976,000	(738,250,000)	292,194,000
Investing Activities:
Capital Expenditures	0	0	0
Proceeds from Sales of Assets	13,000	112,000	254,000
Increase (Decrease) in Restricted Cash		0	0
Net Investment in Equity Affiliates	0	0	0
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	13,000	112,000	254,000
Cash Provided by (Used in) Investing Activities, Discontinued Operations		777,145,000	(328,789,000)
Net Cash Used in Investing Activities		777,257,000	(328,535,000)
Financing Activities:
Repayments of Other Debt	2,630,000	792,000
Payments On Long Term Notes Including Redemption Premium	0
Proceeds from Issuance of Long-Term Notes	0
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities	0
Payments on Securitzation Facility		(37,846,000)
Dividends Paid	0	0	0
(Payments on) Proceeds from Short-Term Borrowings		0
Proceeds from Issuance of Common Stock	0		0
Proceeds from Issuance of Common Stock		0
Other Financing Activities	0	0	37,404,000
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	(2,630,000)	(38,638,000)	37,404,000
Cash Provided by (Used in) Financing Activities, Discontinued Operations		(520,000)	(601,000)
Net Cash (Used in) Provided by Financing Activities		(39,158,000)	36,803,000
Elimination
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	387,663,000	332,487,000	0
Cash Provided by (Used in) Operating Activities, Discontinued Operations	0	0	0
Net Cash Provided by Operating Activities	387,663,000	332,487,000	0
Investing Activities:
Capital Expenditures	0	0	0
Proceeds from Sales of Assets	0	0	0
Increase (Decrease) in Restricted Cash		0	0
Net Investment in Equity Affiliates	0	0	200,000,000
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	0	0	(200,000,000)
Cash Provided by (Used in) Investing Activities, Discontinued Operations		0	0
Net Cash Used in Investing Activities		0	(200,000,000)
Financing Activities:
Repayments of Other Debt	387,663,000	0
Payments On Long Term Notes Including Redemption Premium	0
Proceeds from Issuance of Long-Term Notes	0
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities	0
Payments on Securitzation Facility		0
Dividends Paid	0	0	(200,000,000)
(Payments on) Proceeds from Short-Term Borrowings		(332,487,000)
Proceeds from Issuance of Common Stock	0		0
Proceeds from Issuance of Common Stock		0
Other Financing Activities	0	0	0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	(387,663,000)	(332,487,000)	200,000,000
Cash Provided by (Used in) Financing Activities, Discontinued Operations		0	0
Net Cash (Used in) Provided by Financing Activities		$ (332,487,000)	$ 200,000,000

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

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-Publisher FASB

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-URI http://asc.fasb.org/extlink&oid=6513228

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