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The increase (decrease) during the period for right-of-use asset for operating lease.

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Number of facilities acquired with existing ground leases.

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Number of facilities acquired with existing ground leases, for which the leases were classifed as finance leases.

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Number of facilities acquired with existing ground leases, for which the leases were classified as operating leases.

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Number of real estate property acquisition tranches.

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Cash portion of put option paid.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Value of new stock classified as temporary equity issued during the period.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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INVESTMENT ACTIVITY (Details)							3 Months Ended			6 Months Ended		12 Months Ended	18 Months Ended
INVESTMENT ACTIVITY (Details)	Jun. 29, 2021 USD ($)	Jun. 28, 2021	Dec. 22, 2020 USD ($)	Sep. 29, 2020 USD ($) shares	Sep. 28, 2020	Jul. 20, 2020 USD ($)	Jun. 30, 2021 USD ($) property facility	Mar. 31, 2021 property	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) facility property	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) item property facility	Jun. 30, 2021 USD ($) property facility
Self-storage facilities
Number of facilities, construction completed and opened													$ 4
Construction
Self-storage facilities
Total Construction Costs													121,000,000
New York
Self-storage facilities
Aggregate purchase price						$ 9,500,000
Decrease in right-of-use asset						(5,100,000)
Decrease in operating lease liability						$ (5,000,000.0)
Cash paid for acquisition				$ 1,000,000.0
Total consideration				$ 10,000,000.0
Units issued (in shares) \| shares				276,497
Units issued				$ 9,000,000.0
Self-storage facilities under contract
Self-storage facilities
Deposit							$ 400,000			$ 400,000			400,000
Expected aggregate purchase or sales price							$ 33,000,000.0			$ 33,000,000.0			$ 33,000,000.0
Number of facilities under contract \| facility							2			2			2
Self storage under construction
Self-storage facilities
Number of facilities under contract \| property							3			3			3
Development costs							$ 48,400,000			$ 48,400,000			$ 48,400,000
Expected construction cost							75,000,000.0			$ 75,000,000.0			75,000,000.0
Self-storage facility in East Meadow, NY
Self-storage facilities
Total consideration	$ 6,600,000
Number of facilities, construction completed and opened													1
Self-storage facility in East Meadow, NY \| Construction
Self-storage facilities
Total Construction Costs													25,900,000
Self-storage facility in King of Prussia, PA
Self-storage facilities
Number of facilities, construction completed and opened													1
Self-storage facility in King of Prussia, PA \| Construction
Self-storage facilities
Total Construction Costs													22,800,000
Self-storage Facility in Brooklyn, NY
Self-storage facilities
Number of facilities, construction completed and opened													1
Self-storage Facility in Brooklyn, NY \| Construction
Self-storage facilities
Total Construction Costs													45,900,000
Self-storage Facility in Arlington, VA
Self-storage facilities
Number of facilities, construction completed and opened													1
Self-storage Facility in Arlington, VA \| Construction
Self-storage facilities
Total Construction Costs													26,400,000
2021 Acquisitions
Self-storage facilities
Number of self-storage facilities acquired \| facility										2
Aggregate purchase price										$ 34,075,000
Intangible value of the in-place leases							1,600,000			$ 1,600,000			$ 1,600,000
Estimated life										12 months
Amortization expense										$ 49,000
2021 Acquisitions \| Maryland
Self-storage facilities
Aggregate purchase price							22,100,000			22,100,000
2021 Acquisitions \| Self-storage facility in Anoka, MN
Self-storage facilities
Aggregate purchase price										$ 12,000,000.0
Ownership interest held by the entity (as a percent)										50.00%
2020 Acquisitions
Self-storage facilities
Number of self-storage facilities acquired										21		13
Aggregate purchase price										$ 735,875,000		$ 195,900,000
2020 Acquisitions \| Leases, Acquired-in-Place
Self-storage facilities
Intangible value of the in-place leases												$ 11,400,000
Estimated life												12 months
Amortization expense							2,400,000		$ 400,000	5,200,000	$ 500,000
2020 Acquisitions \| Texas
Self-storage facilities
Number of self-storage facilities acquired \| property												3
2020 Acquisitions \| Florida
Self-storage facilities
Number of self-storage facilities acquired \| property												5
2020 Acquisitions \| New York
Self-storage facilities
Number of self-storage facilities acquired \| property												1
2020 Acquisitions \| Maryland
Self-storage facilities
Number of self-storage facilities acquired \| property												1
2020 Acquisitions \| Nevada
Self-storage facilities
Number of self-storage facilities acquired \| property												1
2020 Acquisitions \| Virginia
Self-storage facilities
Number of self-storage facilities acquired \| property												1
2020 Acquisitions \| New Jersey
Self-storage facilities
Number of self-storage facilities acquired \| property								1				1
2020 Acquisitions \| Self-storage facilities located in New York
Self-storage facilities
Number of self-storage facilities acquired \| facility												8
Number of real estate property acquisition tranches \| item												2
Aggregate purchase price												$ 540,000,000.0
Intangible value of the in-place leases												48,600,000
Cash paid for acquisition												210,500,000
Issuance of OP Shares												175,100,000
Repayments of debt												33,200,000
Units issued												$ 5,272,023
Number of properties, assumed mortgage \| item												6
Assumed mortgage debt, at fair value												$ 169,200,000
Outstanding principal balance of mortgage debt assumed on acquisitions												154,400,000
Premium on debt assumed on acquisitions												$ 14,800,000
2020 Acquisitions \| Self-storage facilities located in New York \| Leases, Acquired-in-Place
Self-storage facilities
Estimated life												12 months
Amortization expense							$ 12,100,000			24,300,000
Number of assumed ground leases \| item												3
Number of facilities acquired with existing ground leases, for which the leases were classifed as finance leases \| item												2
Number of facilities acquired with existing ground leases, for which the leases were classified as operating leases \| item												1
2020 Dispositions
Self-storage facilities
Aggregate sale price										$ 12,750,000
2020 Dispositions \| Self-storage facilities located in New York
Self-storage facilities
Aggregate sale price			$ 12,800,000
Gains from sale of real estate, net			$ 6,700,000
Joint Venture \| Self-storage facility in East Meadow, NY
Self-storage facilities
Ownership interest held by the entity (as a percent)		51.00%
Minority ownership interest (as a percent)	49.00%
Joint Venture \| Self Storage Facility in Bayonne, NJ
Self-storage facilities
Ownership interest held by the entity (as a percent)					51.00%
Joint Venture \| Self Storage Facility in Brooklyn, NY I
Self-storage facilities
Total consideration				$ 10,000,000.0
Put option ownership percentage in joint venture exercised (as a percent)				49.00%
Cash portion of put option paid				$ 1,000,000.0
Units issued (in shares) \| shares				276,497
Units issued				$ 9,000,000.0
Cubesmart
Self-storage facilities
Ownership interest by Parent							96.50%			96.50%			96.50%
Cubesmart \| Self-storage facility in East Meadow, NY
Self-storage facilities
Ownership interest by Parent							100.00%			100.00%			100.00%
Cubesmart \| Self-storage facility in King of Prussia, PA
Self-storage facilities
Ownership interest by Parent							70.00%			70.00%			70.00%
Cubesmart \| Self-storage Facility in Brooklyn, NY
Self-storage facilities
Ownership interest by Parent							100.00%			100.00%			100.00%
Cubesmart \| Self-storage Facility in Arlington, VA
Self-storage facilities
Ownership interest by Parent							90.00%			90.00%			90.00%