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UNSECURED SENIOR NOTES (Details) $ in Thousands	6 Months Ended
UNSECURED SENIOR NOTES (Details) $ in Thousands	Jun. 30, 2026 USD ($)	Dec. 31, 2025 USD ($)	Jan. 24, 2019 USD ($)
UNSECURED SENIOR NOTES
Senior notes, principal amount	$ 2,950,000	$ 2,950,000
Total unsecured senior notes, net	2,927,533	2,925,103
CubeSmart, L.P. and Subsidiaries
UNSECURED SENIOR NOTES
Total unsecured senior notes, net	2,927,533	2,925,103
Senior Notes
UNSECURED SENIOR NOTES
Less: Discount on issuance of notes, net	(11,540)	(12,669)
Less: Loan procurement costs, net	(10,927)	(12,228)
Total unsecured senior notes, net	$ 2,927,533	2,925,103
Senior Notes \| Maximum
UNSECURED SENIOR NOTES
Consolidated leverage ratio	0.60
Secured debt leverage ratio	0.40
Senior Notes \| Minimum
UNSECURED SENIOR NOTES
Consolidated interest coverage ratio	1.50
Financial and customary covenant, minimum unencumbered asset (as a percent)	150.00%
Senior Notes 3.125% Due 2026
UNSECURED SENIOR NOTES
Senior notes, principal amount	$ 300,000	300,000
Interest rate (as a percent)	3.125%
Effective interest rate (as a percent)	3.18%
Senior Notes 2.250 % Due 2028
UNSECURED SENIOR NOTES
Senior notes, principal amount	$ 550,000	550,000
Interest rate (as a percent)	2.25%
Effective interest rate (as a percent)	2.33%
Senior Notes 4.375 % Due 2029
UNSECURED SENIOR NOTES
Senior notes, principal amount	$ 350,000	350,000	$ 350,000
Interest rate (as a percent)	4.375%		4.375%
Effective interest rate (as a percent)	4.46%
Senior Notes 3.000 % Due 2030
UNSECURED SENIOR NOTES
Senior notes, principal amount	$ 350,000	350,000
Interest rate (as a percent)	3.00%
Effective interest rate (as a percent)	3.04%
Senior Notes 2.000 % Due 2031
UNSECURED SENIOR NOTES
Senior notes, principal amount	$ 450,000	450,000
Interest rate (as a percent)	2.00%
Effective interest rate (as a percent)	2.10%
Senior Notes 2.500 % Due 2032
UNSECURED SENIOR NOTES
Senior notes, principal amount	$ 500,000	500,000
Interest rate (as a percent)	2.50%
Effective interest rate (as a percent)	2.59%
Senior Notes 5.125 % Due 2035
UNSECURED SENIOR NOTES
Senior notes, principal amount	$ 450,000	$ 450,000
Interest rate (as a percent)	5.125%
Effective interest rate (as a percent)	5.30%