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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%