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Real Estate Facilities - Summary of Reconciles Total Consideration Transferred (Parenthetical) (Detail) - USD ($) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 01, 2022 | Mar. 17, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Mar. 07, 2024
Business Acquisition [Line Items] |  |  |  |  |  |  |
Debt Instrument Carrying Amount |  |  |  | $ 1,091,787,168 |  |  | $ 1,097,447,335
Business acquisition, transaction costs |  |  |  | $ 192,358 | $ 888,009 | $ 934,838 |
KeyBank SST IV CMBS Loan |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Debt Instrument Carrying Amount |  |  | $ 40,500,000 |  |  |  |
Fair market value discount on debt |  | $ 16,100,000 |  |  |  |  |
Strategic Storage Trust IV, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash consideration | [1] |  | 54,250,000 |  |  |  |
Debt Instrument Carrying Amount |  |  | 54,000,000 |  |  |  |
Business acquisition, transaction costs |  |  | $ 300,000 |  |  |  |
SSGT II Merger Agreement |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash consideration | [2] | 76,300,006 |  |  |  |  |
Debt Instrument Carrying Amount |  | 75,100,000 |  |  |  |  |
Business acquisition, transaction costs |  | $ 1,200,000 |  |  |  |  |
[1] | The approximately $54.3 million in cash was primarily used to pay off approximately $54.0 million of SST IV debt that we did not assume in the SST IV Merger, as well as approximately $0.3 million in transaction costs.
[2] | The approximately $76.3 million in cash was primarily used to pay off approximately $75.1 million of SSGT II's debt that we did not assume in the SSGT II Merger, as well as approximately $1.2 million in transaction costs.

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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://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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-4 + Details
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