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INVESTMENT ACTIVITY (Details)				1 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended	21 Months Ended
	Jan. 18, 2023 USD ($)	Apr. 28, 2022 USD ($)	Feb. 02, 2022 USD ($)	Aug. 31, 2023 USD ($)	Feb. 28, 2022 USD ($)	Dec. 31, 2021 facility	Sep. 30, 2023 USD ($) facility	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) facility	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) facility	Sep. 30, 2023 USD ($) facility
Self-storage facilities
Number of facilities, construction completed and opened												$ 2
Right-of-use assets - operating leases							$ 50,101,000		$ 50,101,000		$ 49,491,000	50,101,000
Construction
Self-storage facilities
Total Construction Costs												$ 59,000
Self storage under construction
Self-storage facilities
Number of self-storage facilities | facility							3		3			3
Development costs							$ 51,500,000		$ 51,500,000			$ 51,500,000
Expected construction cost							$ 82,500,000		$ 82,500,000			$ 82,500,000
Self storage under construction | New York
Self-storage facilities
Number of self-storage facilities | facility							2		2			2
Self storage under construction | New Jersey
Self-storage facilities
Number of self-storage facilities | facility							1		1			1
Self Storage Facility in Valley Stream, NY
Self-storage facilities
Number of facilities, construction completed and opened												$ 1
Option to put ownership interest in the venture	$ 49
Cash portion of put option paid	$ 15,300,000
Self Storage Facility in Valley Stream, NY | Construction
Self-storage facilities
Total Construction Costs												37,200,000
Self Storage Facility in Vienna, VA
Self-storage facilities
Number of facilities, construction completed and opened												1
Self Storage Facility in Vienna, VA | Construction
Self-storage facilities
Total Construction Costs												$ 21,800,000
Self-storage Facility in Bronx, NY
Self-storage facilities
Lease liability derecognized			$ 5,000,000.0
Right of use Assets derecognized			4,100,000
2023 Acquisitions
Self-storage facilities
Number of self-storage facilities acquired | facility									0
2023 Dispositions | LAACO.
Self-storage facilities
Aggregate sale price				$ 800,000
Gains from sales of real estate, net							$ 200,000		$ 200,000
2022 Acquisitions
Self-storage facilities
Number of self-storage facilities acquired | facility											3	3
Aggregate purchase price											$ 75,700,000	$ 75,700,000
Intangible value of the in-place leases											$ 3,400,000
Estimated life											12 months
2022 Acquisitions | Leases, Acquired-in-Place
Self-storage facilities
Amortization expense								$ 900,000	$ 1,200,000	$ 1,400,000
2022 Acquisitions | Texas
Self-storage facilities
Number of self-storage facilities acquired | facility											1
2022 Acquisitions | Maryland
Self-storage facilities
Number of self-storage facilities acquired | facility											1
2022 Acquisitions | Georgia
Self-storage facilities
Number of self-storage facilities acquired | facility											1
2022 Acquisitions | Self-storage Facility in Bronx, NY
Self-storage facilities
Aggregate purchase price			$ 7,500,000
2022 Dispositions | LAACO.
Self-storage facilities
Aggregate sale price					$ 44,000,000.0
Gains from sales of real estate, net					$ 0
2021 Acquisitions | LAACO
Self-storage facilities
Number of self-storage facilities acquired | facility						59
Joint Venture
Self-storage facilities
Real estate property acquired, land subject to ground lease		$ 6,100,000
Joint Venture | Acquisitions
Self-storage facilities
Percentage of interest acquired		20.00%
Joint Venture | Self Storage Facility in Valley Stream, NY
Self-storage facilities
Ownership interest held by the entity (as a percent)											51.00%
Cubesmart
Self-storage facilities
Ownership interest by Parent							99.40%		99.40%			99.40%
Cubesmart | Self Storage Facility in Valley Stream, NY
Self-storage facilities
Ownership interest held by the entity (as a percent)												100.00%
Cubesmart | Self Storage Facility in Vienna, VA
Self-storage facilities
Ownership interest held by the entity (as a percent)												80.00%

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