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Acquisitions and Dispositions (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 28, 2020 | Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 27, 2020
Business Acquisition [Line Items] |  |  |  |  |  |
Common units (in shares) |  |  |  | 211,982,785 | 220,440,993 |
CNXM, CNX Midstream GP LLC, CNX Resources Holding LLC Merger Agreement |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of shares issued in acquisition (in shares) | 37,054,223 |  |  |  |  |
Entity shares issued per acquiree share (in shares) | 0.88 |  |  |  |  |
Consideration | $ 384,623 |  |  |  |  |
Merger costs |  | $ 4,518 | $ 4,737 |  |  |
CNXM |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Common units (in shares) | 42,107,071 |  |  |  |  |
CNXM | Public Unitholders |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Ownership percentage of public unitholders |  |  |  |  |  | 46.90%
CNXM | CNX |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Ownership percentage by parent |  |  |  |  |  | 53.10%

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