Amount of total construction cost expected of the projects.

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The number of self-storage facilities with construction completed and opened for operation during the period.

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Represents the number of facilities under contract.

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Represents the information pertaining to number of joint ventures.

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Represents the number of real estate properties that were acquired.

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Represents the number of real estate properties that were sold.

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The number of self-storage facilities involved in transaction.

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Present value of lessee's discounted obligation for lease payments from operating lease, derecognized.

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Amount of lessee's right to use underlying asset under operating lease, derecognized.

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The expected value of all consideration given or received by the Entity in the significant acquisition or disposal.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination.

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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The carrying amount of the asset transferred to a third party to serve as a deposit, which typically serves as security against failure by the transferor to perform under terms of an agreement.

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This element represents the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property. Such amount may include the value assigned to existing tenant relationships and excludes the market adjustment component of the value assigned for above or below-market leases acquired.

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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 difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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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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Amount of lessee's right to use underlying asset under operating lease.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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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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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		12 Months Ended	15 Months Ended
INVESTMENT ACTIVITY (Details)	Feb. 02, 2022 USD ($)	Dec. 14, 2021 USD ($)	Dec. 09, 2021 item facility	Jun. 29, 2021 USD ($)	Mar. 31, 2022 USD ($) facility property	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) item facility	Mar. 31, 2022 USD ($) property facility
Self-storage facilities
Number of facilities, construction completed and opened								$ 4
Right-of-use assets - operating leases					$ 50,309,000		$ 54,741,000	50,309,000
Construction
Self-storage facilities
Total Construction Costs								95,900
Texas \| LAACO
Self-storage facilities
Number of self-storage facilities acquired \| facility			7
Self-storage facilities under contract
Self-storage facilities
Deposit					200,000			200,000
Expected aggregate purchase or sales price					$ 20,000,000.0			$ 20,000,000.0
Number of facilities under contract \| facility					1			1
Self storage under construction
Self-storage facilities
Number of facilities under contract \| property					3			3
Development costs					$ 74,800,000			$ 74,800,000
Expected construction cost					$ 97,300,000			$ 97,300,000
Self storage under construction \| New York
Self-storage facilities
Number of facilities under contract \| property					2			2
Self storage under construction \| Virginia
Self-storage facilities
Number of facilities under contract \| property					1			1
Self Storage Facility in Newton, MA
Self-storage facilities
Number of facilities, construction completed and opened								$ 1
Self Storage Facility in Newton, MA \| Construction
Self-storage facilities
Total Construction Costs								20,800,000
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 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
Self-storage Facility in Bronx, NY
Self-storage facilities
Lease liability derecognized	$ 5,000,000.0
Right of use Assets derecognized	4,100,000
2021 Acquisitions
Self-storage facilities
Number of self-storage facilities acquired \| facility							66
Aggregate purchase price							$ 1,801,251,000
Intangible value of the in-place leases					$ 11,900,000			11,900,000
Estimated life							12 months
Amortization expense					3,000,000.0	$ 0
2021 Acquisitions \| LAACO
Self-storage facilities
Number of self-storage facilities acquired \| facility			57				57
Intangible value of the in-place leases					$ 109,700,000			$ 109,700,000
Estimated life					12 months
Amortization expense					$ 27,400,000
Number of joint ventures \| item			2				2
2021 Acquisitions \| Acquisitions
Self-storage facilities
Percentage of interest acquired					50.00%			50.00%
2021 Acquisitions \| Acquisitions \| LAACO
Self-storage facilities
Ownership interest held by the entity (as a percent)			50.00%
2021 Acquisitions \| Nevada \| LAACO
Self-storage facilities
Number of self-storage facilities acquired \| facility			13
2021 Acquisitions \| California \| LAACO
Self-storage facilities
Number of self-storage facilities acquired \| facility			20
2021 Acquisitions \| Arizona \| LAACO
Self-storage facilities
Number of self-storage facilities acquired \| facility			17
2021 Acquisitions \| Self-storage facilities located in US
Self-storage facilities
Number of self-storage facilities acquired \| facility							8
Aggregate purchase price							$ 140,800,000
2021 Acquisitions \| Self-storage facilities located in US \| Florida
Self-storage facilities
Number of self-storage facilities acquired \| facility							1
2021 Acquisitions \| Self-storage facilities located in US \| Maryland
Self-storage facilities
Number of self-storage facilities acquired \| facility							1
2021 Acquisitions \| Self-storage facilities located in US \| Nevada
Self-storage facilities
Number of self-storage facilities acquired \| facility							1
2021 Acquisitions \| Self-storage facilities located in US \| Pennsylvania
Self-storage facilities
Number of self-storage facilities acquired \| facility							2
2021 Acquisitions \| Self-storage facilities located in US \| New Jersey
Self-storage facilities
Number of self-storage facilities acquired \| facility							1
2021 Acquisitions \| Self-storage facilities located in US \| Illinois
Self-storage facilities
Number of self-storage facilities acquired \| facility							1
2021 Acquisitions \| Self-storage facilities located in US \| Georgia
Self-storage facilities
Number of self-storage facilities acquired \| facility							1
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%
2022 Acquisitions
Self-storage facilities
Number of self-storage facilities acquired \| facility					1
Aggregate purchase price					$ 32,000,000
2022 Acquisitions \| Maryland
Self-storage facilities
Estimated life					12 months
2022 Acquisitions \| Self-storage Facility in Bronx, NY
Self-storage facilities
Aggregate purchase price	$ 7,500,000
2022 Acquisitions \| Self Storage Facilities In Maryland
Self-storage facilities
Number of self-storage facilities acquired \| facility					1
Aggregate purchase price					$ 32,000,000.0
Intangible value of the in-place leases					1,300,000			$ 1,300,000
2022 Acquisitions \| Self Storage Facilities In Maryland \| Leases, Acquired-in-Place
Self-storage facilities
Amortization expense					200,000
2021 Dispositions
Self-storage facilities
Number of self-storage facilities sold \| facility							5
Aggregate sale price							$ 43,800,000
Gains from sales of real estate, net							$ 32,700,000
2021 Dispositions \| Texas
Self-storage facilities
Number of self-storage facilities sold \| facility							1
2021 Dispositions \| Colorado
Self-storage facilities
Number of self-storage facilities sold \| facility							1
2021 Dispositions \| Nevada
Self-storage facilities
Number of self-storage facilities sold \| facility							1
2021 Dispositions \| North Carolina
Self-storage facilities
Number of self-storage facilities sold \| facility							2
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
Total consideration		$ 3,400,000
Acquisition, gain (loss) recognized		$ 0
Ownership interest held by the entity (as a percent)						90.00%
Minority ownership interest (as a percent)		0.00%
Acquisition of noncontrolling interest		$ 2,700,000
Repayments of debt		$ 13,200,000
Joint Venture \| Acquisitions
Self-storage facilities
Acquisition of remaining interest in real estate ventures (as a percent)		10.00%
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 \| 2021 Acquisitions \| LAACO
Self-storage facilities
Number of self-storage facilities \| facility			1
Cubesmart
Self-storage facilities
Ownership interest by Parent					99.40%			99.40%
Cubesmart \| Self Storage Facility in Newton, MA
Self-storage facilities
Ownership interest held by the entity (as a percent)								100.00%
Cubesmart \| Self-storage facility in East Meadow, NY
Self-storage facilities
Ownership interest held by the entity (as a percent)								100.00%
Cubesmart \| Self-storage facility in King of Prussia, PA
Self-storage facilities
Ownership interest held by the entity (as a percent)								70.00%
Cubesmart \| Self-storage Facility in Arlington, VA
Self-storage facilities
Ownership interest held by the entity (as a percent)								90.00%