| Document and Entity Information | Mar. 21, 2022 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001559484 |
| Document Type | 8-K |
| Document Period End Date | Mar. 21, 2022 |
| Entity Registrant Name | RESOURCE REIT, INC. |
| Entity Incorporation State Country Code | MD |
| Entity File Number | 000-55430 |
| Entity Tax Identification Number | 80-0854717 |
| Entity Address, Address Line One | 1845 Walnut Street |
| Entity Address, Address Line Two | 17th Floor |
| Entity Address, City or Town | Philadelphia |
| Entity Address, State or Province | PA |
| Entity Address, Postal Zip Code | 19103 |
| City Area Code | (215) |
| Local Phone Number | 231-7050 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
