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 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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Real estate property acquired, land subject to ground lease.

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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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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 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		9 Months Ended		12 Months Ended	21 Months Ended
INVESTMENT ACTIVITY (Details)	Apr. 28, 2022 USD ($)	Feb. 02, 2022 USD ($)	Dec. 14, 2021 USD ($)	Dec. 09, 2021 facility item	Jun. 29, 2021 USD ($)	Sep. 30, 2022 USD ($) facility	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) facility	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) facility item	Sep. 30, 2022 USD ($) facility
Self-storage facilities
Gains from sales of real estate, net							$ 28,815,000		$ 28,815,000
Number of facilities, construction completed and opened											$ 6
Right-of-use assets - operating leases						$ 49,761,000		$ 49,761,000		$ 54,741,000	49,761,000
Construction
Self-storage facilities
Total Construction Costs											156,700
Texas \| LAACO
Self-storage facilities
Number of self-storage facilities acquired \| facility				7
Self storage under construction
Self-storage facilities
Expected construction cost						$ 46,200,000		$ 46,200,000			$ 46,200,000
Self storage under construction \| New York
Self-storage facilities
Number of self-storage facilities \| facility						1		1			1
Development costs						$ 22,300,000		$ 22,300,000			$ 22,300,000
Self Storage Facility in Valley Stream, NY
Self-storage facilities
Number of facilities, construction completed and opened											1
Self Storage Facility in Valley Stream, NY \| Construction
Self-storage facilities
Total Construction Costs											39,000,000
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						1,700,000		7,500,000
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		$ 82,200,000
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								3
Aggregate purchase price								$ 75,700,000
Intangible value of the in-place leases						$ 3,400,000		$ 3,400,000			$ 3,400,000
Estimated life								12 months
2022 Acquisitions \| Leases, Acquired-in-Place
Self-storage facilities
Amortization expense						$ 900,000		$ 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
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 Valley Stream, NY
Self-storage facilities
Ownership interest held by the entity (as a percent)											51.00%
Cubesmart \| Self Storage Facility in Vienna, VA
Self-storage facilities
Ownership interest held by the entity (as a percent)											80.00%
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%