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NONCONTROLLING INTERESTS - Interests in Consolidated Real Estate Joint Ventures (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($) facility	Dec. 31, 2023 USD ($)
Variable Interest Entity [Line Items]
Total assets	$ 6,184,456	$ 6,225,020
Total liabilities	$ 3,337,110	$ 3,344,212
VIE
Variable Interest Entity [Line Items]
Number of Stores | facility	8
Total assets	$ 190,028
Total liabilities	100,538
Related Party Loans	$ 94,801
New Rochelle Investors LLC | VIE
Variable Interest Entity [Line Items]
Number of Stores | facility	1
CubeSmart Ownership Interest	70.00%
Total assets	$ 26,591
Total liabilities	3,132
Related Party Loans	$ 1,923
1074 Raritan Road, LLC | VIE
Variable Interest Entity [Line Items]
Number of Stores | facility	1
CubeSmart Ownership Interest	90.00%
Total assets	$ 15,471
Total liabilities	9,511
Related Party Loans	$ 8,949
350 Main Street, LLC | VIE
Variable Interest Entity [Line Items]
Number of Stores | facility	1
CubeSmart Ownership Interest	90.00%
Total assets	$ 6,268
Total liabilities	$ 54
Astoria Investors, LLC | VIE
Variable Interest Entity [Line Items]
Number of Stores | facility	1
CubeSmart Ownership Interest	70.00%
Total assets	$ 45,714
Total liabilities	31,555
Related Party Loans	$ 28,722
CS Vienna LLC | VIE
Variable Interest Entity [Line Items]
Number of Stores | facility	1
CubeSmart Ownership Interest	80.00%
Total assets	$ 30,532
Total liabilities	35,497
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	$ 18,929
Total liabilities	14,878
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	$ 36,508
Total liabilities	$ 330
C S Lock Up Anoka LLC | VIE
Variable Interest Entity [Line Items]
Number of Stores | facility	1
CubeSmart Ownership Interest	50.00%
Total assets	$ 10,015
Total liabilities	5,581
Related Party Loans	$ 5,540

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