| Document and Entity Information | Nov. 30, 2020 |
| Document And Entity Information [Line Items] | |
| Entity Registrant Name | CNX Resources Corp |
| Entity Address, State or Province | PA |
| Amendment Flag | false |
| Entity Central Index Key | 0001070412 |
| Document Type | 8-K |
| Document Period End Date | Nov. 30, 2020 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-14901 |
| Entity Tax Identification Number | 51-0337383 |
| Entity Address, Address Line One | CNX Center |
| Entity Address, Address Line Two | 1000 CONSOL Energy Drive |
| Entity Address, Address Line Three | Suite 400 |
| Entity Address, City or Town | Canonsburg |
| Entity Address, Postal Zip Code | 15317 |
| City Area Code | (724) |
| Local Phone Number | 485-4000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common Stock ($.01 par value) |
| Trading Symbol | CNX |
| Security Exchange Name | NYSE |
| Preferred Share Purchase Rights [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Preferred Share Purchase Rights |
| Trading Symbol | — |
| Security Exchange Name | NYSE |
