| **Fair Value Measurements and Disclosures - Fair Value of Equity Method Investments (Details) - USD ($) $ in Thousands** | 3 Months Ended |           |
|--------------------------------------------------------------------------------------------------------------------------|----------------|-----------|
||
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                         |           |      |   |
| Equity owned (units)                                                                                                     | 0              |      | 21,692,198 |
| Carrying Amount                                                                                                          |           |      |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                         |           |      |   |
| Investment in CNX Midstream Partners (0 Common Units and 21,692,198 Common Units, respectively)                          | $ 0            |      | $ 70,000 |
| Fair Value(1)                                                                                                            |           |      |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                         |           |      |   |
| Investment in CNX Midstream Partners (0 Common Units and 21,692,198 Common Units, respectively)                          | $ 0            |      | $ 364,000 |
| CONE Gathering LLC                                                                                                       |           |      |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                         |           |      |   |
| Shares sold (in shares)                                                                                                  | 14,200,000     | 7,500,000 |   |

| X                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Investment Owned, Balance, Shares Sold
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value portion of investments accounted under the equity method.
+ References
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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Balance held at close of period in number of shares.
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