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Related Party Transaction (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2014
Dec. 31, 2016
Related Party Transaction [Line Items]        
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures $ 197,385,000     $ 190,964,000
Other General Expense 100,126,000 $ 95,064,000    
Income (Loss) from Equity Method Investments $ (12,330,000) (16,665,000)    
Partners' Capital Account, Units, Sold in Public Offering 5,000,000      
Initial Public Offering Share Price $ 15.00      
Initial Public Offering overallotment 561,067      
Debt Instrument, Face Amount $ 400,000,000      
Long-term Debt 2,622,358,000     2,724,672,000
Financing Related Fees 3,000,000      
Long-term debt, net of fees 197,000,000      
Net Proceeds from Initial Public Offering 342,711,000      
Cash paid for additional interest $ 21,500,000      
Preferred Units, Issued 3,956,496      
Preferred Stock, Par or Stated Value Per Share $ 17.01      
Other Significant Noncash Transaction, Value of Consideration Given $ 67,300,000      
volume weighted average trading price $ 14.79      
Accounts Payable, Related Parties $ 1,764,000,000     1,666,000,000
CONE Gathering [Member]        
Related Party Transaction [Line Items]        
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures 152,941,000     151,075,000
Distribution Made to Limited Partner, Cash Distributions Paid 0      
Income (Loss) from Equity Method Investments 2,000 6,000    
Related Party Transaction, Expenses from Transactions with Related Party 0 217    
Equity Method Investment Summarized Financial Information, Equity 1,866,000      
CONE Midstream [Member]        
Related Party Transaction [Line Items]        
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures 22,296,000     18,133,000
Sale of Stock, Description of Transaction     20125000  
Excess Stock, Shares Authorized     2,625,000  
Distribution Made to Limited Partner, Cash Distributions Paid (5,909,000)      
Income (Loss) from Equity Method Investments 10,000 8,000    
Related Party Transaction, Expenses from Transactions with Related Party 34,054 31,645    
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
Equity Method Investment Summarized Financial Information, Equity 10,072,000      
CONE [Member]        
Related Party Transaction [Line Items]        
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures 175,237,000     $ 169,208,000
Distribution Made to Limited Partner, Cash Distributions Paid (5,909,000)      
Due from Related Parties 8,000     $ 6,000
Equity Method Investment Summarized Financial Information, Equity 11,938,000      
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      
Operating and Other Costs [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Expenses from Transactions with Related Party 872,000 1,266,000    
Selling and Direct Administrative Expenses [Member] [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Expenses from Transactions with Related Party $ 717,000 $ 1,116,000