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Acquisitions and Dispositions - Narrative (Details) |  |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2018 USD ($) | May 02, 2018 USD ($) well | Mar. 30, 2018 USD ($) | Jan. 03, 2018 USD ($) | Dec. 14, 2017 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Net gain (loss) on sale |  | $ 286,000 |  |  |  | $ 3,308,000 | $ 134,320,000 |  | $ 610,000 | $ 148,942,000
Proceeds from Asset Exchange Agreement |  | $ 7,000,000 |  |  |  |  |  |  |  |
Minimum commitment of wells | well |  | 40 |  |  |  |  |  |  |  |
Impairment of intangible asset |  |  |  |  |  | 0 | 0 |  | 0 | 18,650,000
Gain on remeasurement of fair value of previously held equity interest |  |  |  |  |  | $ 0 | $ 0 |  | $ 0 | 623,663,000
Midstream Acquisition |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Cash consideration transferred |  |  |  | $ 305,000,000 | $ 305,000,000 |  |  |  |  |
Fair value of previously held equity interest |  |  |  | 799,033,000 |  |  |  |  |  |
Gain on remeasurement of fair value of previously held equity interest |  |  |  | $ 623,663,000 |  |  |  |  |  |
Utica Shale |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Cash consideration received in sale of oil and gas assets | $ 381,214,000 |  |  |  |  |  |  |  |  |
Net gain (loss) on sale | $ 130,849,000 |  |  |  |  |  |  |  |  |
Shallow Oil, Gas, and CBM Assets in Pennsylvania and West Virginia |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Cash consideration received in sale of oil and gas assets |  |  | $ 89,296,000 |  |  |  |  |  |  |
Net gain (loss) on sale |  |  |  |  |  |  |  |  |  | 4,432,000
Asset retirement obligations assumed |  |  | $ 196,514,000 |  |  |  |  |  |  |
CNX Gathering LLC |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage in equity method investment |  |  |  | 50.00% | 50.00% | 50.00% |  |  | 50.00% |
CONE Midstream GP LLC |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage by parent |  |  |  |  | 100.00% |  |  |  |  |
Customer Relationships |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment of intangible asset |  |  |  |  |  |  |  |  |  | $ 18,650,000
Customer Relationships | Midstream Acquisition |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment of intangible asset |  |  |  |  |  | $ 0 |  | $ 18,650,000 |  |

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