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NONCONTROLLING INTERESTS - Interests in Consolidated Real Estate Joint Ventures (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2025 USD ($) facility item	Dec. 31, 2024 USD ($)
NONCONTROLLING INTERESTS
Total assets	$ 6,757,658	$ 6,394,181
Total liabilities	$ 3,902,720	$ 3,440,313
VIE
NONCONTROLLING INTERESTS
Number of Stores | facility	22
Total assets	$ 386,137
Total liabilities	244,513
Related Party Loans	$ 121,735
Hines Capital
NONCONTROLLING INTERESTS
Number Of Consolidated Joint Ventures In Portfolio | item	7
Hines Capital | VIE
NONCONTROLLING INTERESTS
Number of Stores | facility	14
CubeSmart Ownership Interest	85.00%
Total assets	$ 175,998
Total liabilities	$ 117,926
New Rochelle Investors LLC | VIE
NONCONTROLLING INTERESTS
Number of Stores | facility	1
CubeSmart Ownership Interest	70.00%
Total assets	$ 40,554
Total liabilities	17,801
Related Party Loans	$ 16,352
1074 Raritan Road, LLC | VIE
NONCONTROLLING INTERESTS
Number of Stores | facility	1
CubeSmart Ownership Interest	90.00%
Total assets	$ 15,399
Total liabilities	10,978
Related Party Loans	$ 10,623
350 Main Street, LLC | VIE
NONCONTROLLING INTERESTS
Number of Stores | facility	1
CubeSmart Ownership Interest	90.00%
Total assets	$ 17,430
Total liabilities	11,364
Related Party Loans	$ 10,415
Astoria Investors, LLC | VIE
NONCONTROLLING INTERESTS
Number of Stores | facility	1
CubeSmart Ownership Interest	70.00%
Total assets	$ 44,769
Total liabilities	30,823
Related Party Loans	$ 29,964
CS Vienna LLC | VIE
NONCONTROLLING INTERESTS
Number of Stores | facility	1
CubeSmart Ownership Interest	80.00%
Total assets	$ 28,875
Total liabilities	34,587
Related Party Loans	$ 34,049
CS Valley Forge Village Storage LLC | VIE
NONCONTROLLING INTERESTS
Number of Stores | facility	1
CubeSmart Ownership Interest	70.00%
Total assets	$ 18,016
Total liabilities	14,887
Related Party Loans	$ 14,792
SH3, LLC | VIE
NONCONTROLLING INTERESTS
Number of Stores | facility	1
CubeSmart Ownership Interest	90.00%
Total assets	$ 35,695
Total liabilities	$ 511
C S Lock Up Anoka LLC | VIE
NONCONTROLLING INTERESTS
Number of Stores | facility	1
CubeSmart Ownership Interest	50.00%
Total assets	$ 9,401
Total liabilities	5,636
Related Party Loans	$ 5,540

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