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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
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