Amount of total construction cost expected of the projects.

No definition available.

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

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No definition available.

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Represents the number of facilities under contract.

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No definition available.

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Represents the information pertaining to number of joint ventures.

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No definition available.

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Represents the number of real estate properties that were acquired.

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No definition available.

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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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No definition available.

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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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Real estate property acquired, land subject to ground lease.

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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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No definition available.

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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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In a business combination achieved in stages, this element represents the amount of net gain (loss) recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the 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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The current amount of expenditures for a real estate project that has not yet been completed.

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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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No definition available.

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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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No definition available.

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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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No definition available.

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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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No definition available.

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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	6 Months Ended	12 Months Ended	18 Months Ended
INVESTMENT ACTIVITY (Details)	Apr. 28, 2022 USD ($)	Feb. 02, 2022 USD ($)	Dec. 14, 2021 USD ($)	Dec. 09, 2021 item facility	Jun. 29, 2021 USD ($)	Jun. 30, 2022 USD ($) facility	Jun. 30, 2022 USD ($) facility	Dec. 31, 2021 USD ($) facility item	Jun. 30, 2022 USD ($) facility
Self-storage facilities
Number of facilities, construction completed and opened									$ 5
Right-of-use assets - operating leases						$ 50,029,000	$ 50,029,000	$ 54,741,000	50,029,000
Construction
Self-storage facilities
Total Construction Costs									117,700
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		200,000
Expected aggregate purchase or sales price						$ 20,700,000	$ 20,700,000		$ 20,700,000
Number of facilities under contract \| facility						1	1		1
Self storage under construction
Self-storage facilities
Expected construction cost						$ 84,100,000	$ 84,100,000		$ 84,100,000
Self storage under construction \| New York
Self-storage facilities
Number of self-storage facilities \| facility						2	2		2
Development costs						$ 59,100,000	$ 59,100,000		$ 59,100,000
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 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		11,900,000
Estimated life								12 months
2021 Acquisitions \| Other Acquisitions
Self-storage facilities
Amortization expense						2,900,000	5,800,000
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		$ 109,700,000
Estimated life							12 months
Amortization expense						$ 27,400,000	$ 54,800,000
Number of joint ventures \| item				2				2
2021 Acquisitions \| Acquisitions
Self-storage facilities
Percentage of interest acquired						50.00%	50.00%	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							2
Aggregate purchase price							$ 55,000,000
Intangible value of the in-place leases						$ 3,100,000	$ 3,100,000		$ 3,100,000
Estimated life							12 months
2022 Acquisitions \| Leases, Acquired-in-Place
Self-storage facilities
Amortization expense						$ 300,000	$ 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 \| Self-storage Facility in Bronx, NY
Self-storage facilities
Aggregate purchase price		$ 7,500,000
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
Real estate property acquired, land subject to ground lease	$ 6,100,000
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
Percentage of interest acquired	20.00%
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%		99.40%
Cubesmart \| Self Storage Facility in Vienna, VA
Self-storage facilities
Ownership interest held by the entity (as a percent)									72.00%
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%