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Investments in Unconsolidated Real Estate Ventures - Additional Information (Details) $ in Millions |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
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Jul. 05, 2023 USD ($) | Jan. 12, 2023 USD ($) | Jan. 12, 2023 CAD ($) | Dec. 01, 2022 REALESTATEVENTURE | Jun. 01, 2022 USD ($) | May 25, 2022 USD ($) | May 25, 2022 CAD ($) | Apr. 30, 2021 | Nov. 10, 2020 REALESTATEVENTURE | Sep. 30, 2023 USD ($) REALESTATEVENTURE | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) REALESTATEVENTURE | Sep. 30, 2022 USD ($) | Dec. 31, 2027 USD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) Property REALESTATEVENTURE | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2023 CAD ($) REALESTATEVENTURE | Dec. 31, 2022 CAD ($) Property REALESTATEVENTURE | Sep. 13, 2022 CAD ($) | Jun. 01, 2022 CAD ($) | Dec. 31, 2021 CAD ($) | Oct. 07, 2021 USD ($) | Aug. 18, 2021 CAD ($) | Mar. 17, 2021 StorageFacility | Mar. 17, 2021 STORAGEPROPERTY
Investments In Unconsolidated Real Estate Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings (loss) of unconsolidated real estate ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,690,205) | $ (1,050,250) | $ 0 |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 51,200,000 |  |  |  |  |  |  |  |  |  |  |
Increased amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 120.0 |  |  |  |  |  |
Initial maximum amount available |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000,000 |  |  |
Guarantee obligations recourse percentage |  |  |  |  |  |  |  |  |  | 50.00% |  | 50.00% |  |  |  |  | 50.00% |  |  | 50.00% | 50.00% |  |  |  |  |  |  |
Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments In Unconsolidated Real Estate Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fund development costs |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  | $ 3,000,000 | $ 3,000,000 | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |
SmartCentres Storage Finance LP | Master Mortgage Commitment Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments In Unconsolidated Real Estate Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding amount |  |  |  |  |  |  |  |  |  | $ 91,400,000 |  | $ 91,400,000 |  |  |  |  | $ 86,100,000 | 52,900,000 |  | $ 124.2 | $ 116.7 |  |  | $ 67.2 |  |  |  |
Initial maximum amount available |  |  |  |  |  |  |  |  |  |  |  | 7.82% |  |  |  |  | 6.80% |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  | May 11, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan to value ratio |  |  |  |  |  |  |  |  |  | 70.00% |  | 70.00% |  |  |  |  | 70.00% |  |  | 70.00% | 70.00% |  |  |  |  |  |  |
Regent Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments In Unconsolidated Real Estate Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  | 50.00% | 50.00% |  |  | 50.00% |  | 50.00% |  |  |  |  | 50.00% |  |  | 50.00% | 50.00% |  |  |  |  |  |  |
Regent Property | SmartCentres Storage Finance LP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments In Unconsolidated Real Estate Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Whitby Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments In Unconsolidated Real Estate Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Whitby Property | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments In Unconsolidated Real Estate Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase Price Percentage |  | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  | $ 7,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Whitby Property | SmartCentres Storage Finance LP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments In Unconsolidated Real Estate Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Whitby Property | SmartCentres Storage Finance LP | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments In Unconsolidated Real Estate Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
North Whitby Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments In Unconsolidated Real Estate Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase Price Percentage |  | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  | $ 2,000,000 | $ 2.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Canada |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments In Unconsolidated Real Estate Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings (loss) of unconsolidated real estate ventures |  |  |  |  |  |  |  |  |  | $ 300,000 | $ 200,000 | $ 1,200,000 | $ 600,000 |  |  |  | $ 700,000 | $ 500,000 |  |  |  |  |  |  |  |  |  |
Purchase Price Percentage |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  | $ 7,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Canada | Regent Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments In Unconsolidated Real Estate Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  | 50.00% |  | 50.00% |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |
Canada | Regent Property | SmartCentres Storage Finance LP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments In Unconsolidated Real Estate Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  | 50.00% |  | 50.00% |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |
Kingspoint Ontario | SmartCentres Storage Finance LP | Master Mortgage Commitment Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments In Unconsolidated Real Estate Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increased amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 120.0 |  |
SST IV Merger Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments In Unconsolidated Real Estate Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating real estate properties | Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  | 2 |  |  |  |  |  |  |
SST IV Merger Agreement | Canada |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments In Unconsolidated Real Estate Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self storage real estate joint ventures | REALESTATEVENTURE |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating real estate properties |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  | 5 |  |  |  | 5 |  |  |  |  |  | 3 | 3
Number of development real estate properties |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  | 1 |  |  |  | 1 |  |  |  |  |  | 3 | 3
Regent Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments In Unconsolidated Real Estate Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase Price Percentage |  |  |  |  |  | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  | $ 2,700,000 | $ 3.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SSGT II Merger Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments In Unconsolidated Real Estate Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating real estate properties | Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  | 1 |  |  |  |  |  |  |
Purchase price | $ 15,500,000 |  |  |  | $ 261,158,513 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SSGT II Merger Agreement | SmartCentres Storage Finance LP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments In Unconsolidated Real Estate Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial maximum amount available |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 34.3 |  |  |  |  |
Guarantee obligations recourse percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
SSGT II Merger Agreement | SmartCentres Storage Finance LP | Dupont and Aurora Joint Venture Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments In Unconsolidated Real Estate Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
SSGT II Merger Agreement | Canada |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments In Unconsolidated Real Estate Ventures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self storage real estate joint ventures | REALESTATEVENTURE |  |  |  | 3 |  |  |  |  | 6,000,000 |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating real estate properties | REALESTATEVENTURE |  |  |  |  |  |  |  |  |  | 2 |  | 2 |  |  |  |  | 1 |  |  | 2 | 1 |  |  |  |  |  |  |
Number of development real estate properties | REALESTATEVENTURE |  |  |  |  |  |  |  |  |  | 1 |  | 1 |  |  |  |  | 2 |  |  | 1 | 2 |  |  |  |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Date the credit facility terminates, in YYYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition The effective interest rate during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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