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INVESTMENT ACTIVITY (Details)				3 Months Ended		6 Months Ended		12 Months Ended	18 Months Ended
	Jan. 18, 2023 USD ($)	Apr. 28, 2022 USD ($)	Feb. 02, 2022 USD ($)	Jun. 30, 2023 USD ($) facility	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) facility	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) facility	Jun. 30, 2023 USD ($) facility
Self-storage facilities
Number of facilities, construction completed and opened									$ 2
Right-of-use assets - operating leases				$ 50,389,000		$ 50,389,000		$ 49,491,000	50,389,000
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				$ 42,900,000		$ 42,900,000			$ 42,900,000
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
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				$ 500,000	$ 300,000	$ 1,200,000	$ 500,000
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
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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Real estate property acquired, land subject to ground lease.

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