NONCONTROLLING INTERESTS - Interests in Consolidated Real Estate Joint Ventures (Details) $ in Thousands	3 Months Ended
Mar. 31, 2025 USD ($) facility	Dec. 31, 2024 USD ($)
Variable Interest Entity [Line Items]
Total assets	$ 6,740,280	$ 6,394,181
Total liabilities	$ 3,817,473	$ 3,440,313
VIE
Variable Interest Entity [Line Items]
Number of Stores \| facility	22
Total assets	$ 382,867
Total liabilities	230,746
Related Party Loans	$ 107,458
Hines Capital \| VIE
Variable Interest Entity [Line Items]
Number of Stores \| facility	14
CubeSmart Ownership Interest	85.00%
Total assets	$ 182,602
Total liabilities	$ 116,516
New Rochelle Investors LLC \| VIE
Variable Interest Entity [Line Items]
Number of Stores \| facility	1
CubeSmart Ownership Interest	70.00%
Total assets	$ 32,943
Total liabilities	9,939
Related Party Loans	$ 7,634
1074 Raritan Road, LLC \| VIE
Variable Interest Entity [Line Items]
Number of Stores \| facility	1
CubeSmart Ownership Interest	90.00%
Total assets	$ 15,630
Total liabilities	10,616
Related Party Loans	$ 10,393
350 Main Street, LLC \| VIE
Variable Interest Entity [Line Items]
Number of Stores \| facility	1
CubeSmart Ownership Interest	90.00%
Total assets	$ 13,573
Total liabilities	7,102
Related Party Loans	$ 4,827
Astoria Investors, LLC \| VIE
Variable Interest Entity [Line Items]
Number of Stores \| facility	1
CubeSmart Ownership Interest	70.00%
Total assets	$ 44,987
Total liabilities	30,738
Related Party Loans	$ 29,946
CS Vienna LLC \| VIE
Variable Interest Entity [Line Items]
Number of Stores \| facility	1
CubeSmart Ownership Interest	80.00%
Total assets	$ 29,166
Total liabilities	34,840
Related Party Loans	$ 34,335
CS Valley Forge Village Storage LLC \| VIE
Variable Interest Entity [Line Items]
Number of Stores \| facility	1
CubeSmart Ownership Interest	70.00%
Total assets	$ 18,366
Total liabilities	14,862
Related Party Loans	$ 14,792
SH3, LLC \| VIE
Variable Interest Entity [Line Items]
Number of Stores \| facility	1
CubeSmart Ownership Interest	90.00%
Total assets	$ 35,961
Total liabilities	$ 500
C S Lock Up Anoka LLC \| VIE
Variable Interest Entity [Line Items]
Number of Stores \| facility	1
CubeSmart Ownership Interest	50.00%
Total assets	$ 9,639
Total liabilities	5,633
Related Party Loans	$ 5,531

Represents the number of self-storage facilities owned and operated.

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