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Basis of Presentation - Narrative (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 27, 2020
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Receivables related to contracts with customers | $ 147,714 | $ 145,929 |
Other receivables | $ 9,719 | $ 4,238 |
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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