Related Party (Details) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Related Party Transaction [Line Items]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures			$ 190,964,000	$ 237,330,000
Additional Paid in Capital			2,460,864,000	2,435,497,000
Initial Public Offering overallotment	561,067
Income (Loss) from Equity Method Investments			(53,078,000)	(54,897,000)	$ (49,791,000)
Partners' Capital Account, Units, Sold in Public Offering	5,000,000
Initial Public Offering Share Price	$ 15.00
Debt Instrument, Face Amount	$ 400,000,000
Long-term Debt			2,724,672,000	2,705,718,000
Financing Related Fees	3,000,000
Long-term debt, net of fees	197,000,000
Net Proceeds from Initial Public Offering	342,711,000
Proceeds from Noncontrolling Interests			$ 21,500
Shares Issued by Noncontrolling Interest - Drop			3,956,496
Share Price - Drop			$ 17.01
Total Equity Consideration - Drop			$ 67,300
Accounts Payable, Related Parties			1,666,000	4,000
CONE Gathering [Member]
Related Party Transaction [Line Items]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures			151,075,000	202,570,000	94,467,000
Limited Partners' Contributed Capital			17,112,000	20,916,000
Additional Paid in Capital			4,621,000	87,187,000
Related Party Transaction, Expenses from Transactions with Related Party			706,000	1,077	219
Income (Loss) from Equity Method Investments			17,112,000	20,916,000	25,521,000
Distribution Made to Limited Partner, Cash Distributions Paid			(8,224,000)	0
Equity Method Investment, Net Sales Proceeds			(70,000,000)
Equity Method Investment, Change in Basis			4,996,000
CONE Midstream [Member]
Related Party Transaction [Line Items]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures			18,133,000	11,047,000	4,883,000
Limited Partners' Contributed Capital			31,148,000	22,883,000
Additional Paid in Capital			0	0
Sale of Stock, Description of Transaction		20125000
Excess Stock, Shares Authorized		2,625,000
Total Purchase Consideration of Drop			248,000,000
Equity Method Investment, Cash Consideration for Drop			$ 140,000,000
Equity Method Investment, Stock Issued on Drop			5,200,000
Related Party Transaction, Expenses from Transactions with Related Party			$ 123,020	104,291	65,365
Income (Loss) from Equity Method Investments			31,148,000	22,883,000	4,286,000
Distribution Made to Limited Partner, Cash Distributions Paid			(19,066,000)	(16,719,000)
Equity Method Investment, Net Sales Proceeds			0
Equity Method Investment, Change in Basis			(4,996,000)
CONE [Member]
Related Party Transaction [Line Items]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures			169,208,000	213,617,000	99,350,000
Limited Partners' Contributed Capital			48,260,000	43,799,000
Additional Paid in Capital			4,621,000	87,187,000
Due from Related Parties			5,815,000	12,216,000
Inventory, Raw Materials and Purchased Parts, Net of Reserves			2,239,000
Distribution Made to Limited Partner, Cash Distributions Paid			(27,290,000)	(16,719,000)
Equity Method Investment, Net Sales Proceeds			(70,000,000)
Equity Method Investment, Change in Basis			0
CNX Coal Resources LP [Member]
Related Party Transaction [Line Items]
Proceeds from Issuance Initial Public Offering	75,000,000
Long-term Debt	$ 200,000,000
Selling and Direct Administrative Expenses [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party			3,826,000	8,926,000	11,384,000
Operating and Other Costs [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party			$ 4,251,000	$ 6,793,000	$ 6,707,000