| Document and Entity Information | Aug. 25, 2021 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001730346 |
| Document Type | 8-K |
| Document Period End Date | Aug. 25, 2021 |
| Entity Registrant Name | Charah Solutions, Inc. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-38523 |
| Entity Tax Identification Number | 82-4228671 |
| Entity Address, Address Line One | 12601 Plantside Drive |
| Entity Address, City or Town | Louisville |
| Entity Address, State or Province | KY |
| Entity Address, Postal Zip Code | 40299 |
| City Area Code | (502) |
| Local Phone Number | 245-1353 |
| Security 12b Title | Common Stock, $0.01 par value |
| Trading Symbol | CHRA |
| Security Exchange Name | NYSE |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
