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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 |  |

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