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Segment Disclosures - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2022
USD ($)
Segment
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Segment Reporting Information [Line Items]      
Number of reportable business segments | Segment 2    
Assets [1] $ 1,947,217,387 $ 1,618,292,776  
Self Storage      
Segment Reporting Information [Line Items]      
Assets [2] 1,820,922,309 1,546,835,094  
Self Storage | Canada      
Segment Reporting Information [Line Items]      
Assets 170,000,000 185,000,000  
Revenues $ 21,500,000 $ 19,200,000 $ 14,700,000
[1] Other than our investments in and advances to Managed REITs, substantially all of our investments in real estate facilities and intangible assets made during the years ended December 31, 2022 and 2021 were associated with our self storage platform.
[2] Included in the assets of the Self Storage segment as of December 31, 2022 and 2021 were approximately $52.2 million and $49.8 million of goodwill, respectively. Additionally, as of December 31, 2022 we had never recorded any impairment charges to goodwill within the Self Storage segment.