| Document and Entity Information | Feb. 25, 2021 |
| Document Type | 8-K |
| Document Period End Date | Feb. 25, 2021 |
| Entity File Number | 001-32324 |
| Entity Registrant Name | CUBESMART |
| Entity Incorporation, State or Country Code | MD |
| Entity Tax Identification Number | 20-1024732 |
| Entity Address, Address Line One | 5 Old Lancaster Road |
| Entity Address, City or Town | Malvern |
| Entity Address, State or Province | PA |
| Entity Address, Postal Zip Code | 19355 |
| City Area Code | 610 |
| Local Phone Number | 535-5000 |
| Title of 12(b) Security | Common Shares, $0.01 par value per share, of CubeSmart |
| Trading Symbol | CUBE |
| 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 | false |
| Entity Central Index Key | 0001298675 |
| Amendment Flag | false |
| CUBESMART L.P. | |
| Document Type | 8-K |
| Document Period End Date | Feb. 25, 2021 |
| Entity File Number | 000-54462 |
| Entity Registrant Name | CUBESMART, L.P. |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 34-1837021 |
| Entity Address, Address Line One | 5 Old Lancaster Road |
| Entity Address, City or Town | Malvern |
| Entity Address, State or Province | PA |
| Entity Address, Postal Zip Code | 19355 |
| City Area Code | 610 |
| Local Phone Number | 535-5000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001300485 |
| Amendment Flag | false |
