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Real Estate Facilities - Summary of Relative Fair Values of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) - USD ($) $ in Millions | Jun. 01, 2022 | Nov. 10, 2020
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SSGT II Merger Agreement |  |
Business Acquisition [Line Items] |  |
Intangible assets acquired | $ 8.0 |
KeyBank SST IV CMBS Loan |  |
Business Acquisition [Line Items] |  |
Debt |  | $ 40.5
Fair market value discount on debt | $ 16.1 | 0.1
SST IV TCF Loan |  |
Business Acquisition [Line Items] |  |
Debt |  | $ 40.8

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