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NONCONTROLLING INTERESTS - Interests in Consolidated Real Estate Joint Ventures (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2024 USD ($) facility	Dec. 31, 2023 USD ($)
Variable Interest Entity [Line Items]
Total assets	$ 6,192,415	$ 6,225,020
Total liabilities	$ 3,319,783	$ 3,344,212
VIE
Variable Interest Entity [Line Items]
Number of Stores | facility	8
Total assets	$ 190,022
Total liabilities	102,253
Related Party Loans	$ 97,555
New Rochelle Investors LLC | VIE
Variable Interest Entity [Line Items]
Number of Stores | facility	1
CubeSmart Ownership Interest	70.00%
Total assets	$ 27,811
Total liabilities	4,511
Related Party Loans	$ 3,540
1074 Raritan Road, LLC | VIE
Variable Interest Entity [Line Items]
Number of Stores | facility	1
CubeSmart Ownership Interest	90.00%
Total assets	$ 15,357
Total liabilities	9,723
Related Party Loans	$ 9,489
350 Main Street, LLC | VIE
Variable Interest Entity [Line Items]
Number of Stores | facility	1
CubeSmart Ownership Interest	90.00%
Total assets	$ 6,616
Total liabilities	$ 404
Astoria Investors, LLC | VIE
Variable Interest Entity [Line Items]
Number of Stores | facility	1
CubeSmart Ownership Interest	70.00%
Total assets	$ 45,499
Total liabilities	31,483
Related Party Loans	$ 29,319
CS Vienna LLC | VIE
Variable Interest Entity [Line Items]
Number of Stores | facility	1
CubeSmart Ownership Interest	80.00%
Total assets	$ 30,177
Total liabilities	35,337
Related Party Loans	$ 34,875
CS Valley Forge Village Storage LLC | VIE
Variable Interest Entity [Line Items]
Number of Stores | facility	1
CubeSmart Ownership Interest	70.00%
Total assets	$ 18,728
Total liabilities	14,880
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	$ 35,911
Total liabilities	$ 280
C S Lock Up Anoka LLC | VIE
Variable Interest Entity [Line Items]
Number of Stores | facility	1
CubeSmart Ownership Interest	50.00%
Total assets	$ 9,923
Total liabilities	5,635
Related Party Loans	$ 5,540

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