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INVESTMENT ACTIVITY (Details)							1 Months Ended	3 Months Ended	12 Months Ended			36 Months Ended
	Jan. 18, 2023 USD ($)	Apr. 28, 2022 USD ($)	Feb. 02, 2022 USD ($)	Dec. 14, 2021 USD ($)	Dec. 09, 2021 facility item	Jun. 29, 2021 USD ($)	Jan. 31, 2024 USD ($) facility	Dec. 31, 2021 USD ($)	Dec. 31, 2023 USD ($) facility shares	Dec. 31, 2022 USD ($) facility shares	Dec. 31, 2021 USD ($) facility shares	Dec. 31, 2023 USD ($) facility
Self-storage facilities
Proceeds from involuntary conversion, net									$ 7,424,000
Gain on involuntary conversion, net									$ (4,827,000)
Gain (loss) from sale of real estate											$ 32,698,000
Number of stores, construction completed and open for operation | facility												6
Total Construction Costs												$ 154,900,000
Acquisition of noncontrolling interest											$ 3,397,000
OP units redeemed | shares									126,087	475,046	5,519,233
Right-of-use assets - operating leases									$ 50,476,000	$ 49,491,000		$ 50,476,000
LAACO
Self-storage facilities
Gain (loss) from sale of real estate										$ 0
Subsequent event
Self-storage facilities
Aggregate purchase price							$ 20,200,000
Number of facilities to be acquired | facility							2
Purchase Price							$ 20,200,000
Self storage under construction
Self-storage facilities
Number of self-storage facilities | facility									4			4
Development costs									$ 59,300,000			$ 59,300,000
Expected construction cost									$ 109,700,000			$ 109,700,000
Self storage under construction | New York
Self-storage facilities
Number of self-storage facilities | facility									3			3
Self storage under construction | New Jersey
Self-storage facilities
Number of self-storage facilities | facility									1			1
Self Storage Facility in Valley Stream, NY
Self-storage facilities
Number of stores, construction completed and open for operation | facility												1
Ownership interest held by the entity (as a percent)												100.00%
Total Construction Costs												$ 37,200,000
Option to put ownership interest in the venture	49
Cash portion of put option paid	$ 15,300,000
Self Storage Facility in Vienna, VA
Self-storage facilities
Number of stores, construction completed and open for operation | facility												1
Ownership interest held by the entity (as a percent)												80.00%
Total Construction Costs												$ 21,800,000
Self Storage Facility in Newton, MA
Self-storage facilities
Number of stores, construction completed and open for operation | facility												1
Ownership interest held by the entity (as a percent)												100.00%
Total Construction Costs												$ 20,800,000
Self-storage facility in East Meadow, NY
Self-storage facilities
Number of stores, construction completed and open for operation | facility												1
Ownership interest held by the entity (as a percent)												100.00%
Total Construction Costs												$ 25,900,000
Option to put ownership interest in the venture						49
Cash portion of put option paid						$ 6,600,000
Self-storage facility in King of Prussia, PA
Self-storage facilities
Number of stores, construction completed and open for operation | facility												1
Ownership interest held by the entity (as a percent)												70.00%
Total Construction Costs												$ 22,800,000
Self-storage Facility in Arlington, VA
Self-storage facilities
Number of stores, construction completed and open for operation | facility												1
Ownership interest held by the entity (as a percent)												90.00%
Total Construction Costs												$ 26,400,000
2023 Acquisitions
Self-storage facilities
Number of self-storage facilities acquired | facility									1
Aggregate purchase price									$ 22,000,000
Intangible value of the in-place leases									$ 2,000,000.0			$ 2,000,000.0
Estimated life									12 months			12 months
Escrow deposit									$ 200,000			$ 200,000
Purchase Price									22,000,000
2023 Acquisitions | Leases, Acquired-in-Place
Self-storage facilities
Amortization expense									$ 200,000
2023 Acquisitions | New Jersey
Self-storage facilities
Number of self-storage facilities acquired | facility									1
2023 Acquisitions | Subsequent event
Self-storage facilities
Aggregate purchase price							$ 20,200,000
Number of facilities to be acquired | facility							2
Purchase Price							$ 20,200,000
2023 Dispositions
Self-storage facilities
Aggregate sale price									$ 8,000,000
2023 Dispositions | LAACO
Self-storage facilities
Aggregate sale price									800,000
Gain (loss) from sale of real estate									(200,000)
2023 Dispositions | Illinois
Self-storage facilities
Proceeds from involuntary conversion, net									8,000,000.0
Gain on involuntary conversion, net									(4,800,000)
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
Estimated life										12 months
Purchase Price										$ 75,700,000
2022 Acquisitions | Leases, Acquired-in-Place
Self-storage facilities
Amortization expense									1,100,000	$ 2,300,000
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
Purchase Price			7,500,000
Lease liability derecognized			5,000,000.0
Right of use Assets derecognized			$ 4,100,000
2022 Dispositions | LAACO
Self-storage facilities
Aggregate sale price										$ 44,000,000.0
2021 Acquisitions
Self-storage facilities
Number of self-storage facilities acquired | facility											66
Aggregate purchase price											$ 1,801,251,000
Purchase Price											$ 1,801,251,000
2021 Acquisitions | LAACO
Self-storage facilities
Number of self-storage facilities acquired | facility					57
Intangible value of the in-place leases									109,700,000			$ 109,700,000
Estimated life								12 months		12 months	12 months
Amortization expense										$ 100,600,000	$ 9,100,000
Number of facilities under contract | facility					1
Severance costs									0
Number of joint ventures | item					2
2021 Acquisitions | Leases, Acquired-in-Place | LAACO
Self-storage facilities
Amortization expense									0
2021 Acquisitions | Acquisitions | LAACO
Self-storage facilities
Ownership interest held by the entity (as a percent)					50.00%
2021 Acquisitions | LAACO
Self-storage facilities
Percentage of interest acquired					50.00%
2021 Acquisitions | Texas | LAACO
Self-storage facilities
Number of self-storage facilities acquired | facility					7
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
Intangible value of the in-place leases								$ 11,900,000			$ 11,900,000
Estimated life								12 months		12 months	12 months
Amortization expense										$ 8,300,000	$ 3,600,000
Purchase Price											$ 140,800,000
2021 Acquisitions | Self-storage facilities located in US | Leases, Acquired-in-Place
Self-storage facilities
Amortization expense									$ 0
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
Purchase Price											$ 12,000,000.0
Ownership interest held by the entity (as a percent)											50.00%
2021 Dispositions
Self-storage facilities
Number of self-storage facilities sold | facility											5
Aggregate sale price											$ 43,800,000
Gain (loss) from sale of real estate											$ 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
Joint Venture | Acquisitions
Self-storage facilities
Real estate property acquired, land subject to ground lease		$ 6,100,000
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%
Joint Venture | Self Storage Facility in Newton, MA
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 | Self Storage Facility in Newton, MA | Joint Venture
Self-storage facilities
Acquisition of remaining interest in real estate ventures (as a percent)				10.00%
Joint Venture | Self-storage Facility in Brooklyn, NY
Self-storage facilities
Number of joint ventures | facility									2

X

- Definition

Amount of total construction cost expected of the projects.

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The amount of gain (loss) on involuntary conversions.

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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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- Definition

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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Represents the number of real estate properties to be acquired.

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The number of self-storage facilities involved in transaction.

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- Definition

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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Represents the option to put ownership interest in the venture.

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No definition available.

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Cash portion of put option paid.

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Net proceeds from involuntary conversion.

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Real estate property acquired, land subject to ground lease.

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- Definition

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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- Definition

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

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No definition available.

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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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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The current amount of expenditures for a real estate project that has not yet been completed.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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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- Definition

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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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

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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- Definition

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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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
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