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Segment Disclosures - Additional Information (Detail)
 3 Months Ended
Mar. 31, 2023
USD ($)
Segment
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Segment Reporting Information [Line Items]      
Number of reportable business segments | Segment 2    
Asset [1] $ 1,939,826,715   $ 1,947,217,387
Income (loss) from operations 16,900,875 $ 11,567,586  
Self Storage      
Segment Reporting Information [Line Items]      
Asset [2] 1,801,942,160   1,820,922,309
Income (loss) from operations 21,946,267 17,965,312  
Self Storage | Canada      
Segment Reporting Information [Line Items]      
Asset 179,000,000   170,000,000
Revenues 5,300,000 5,100,000  
Corporate and Other      
Segment Reporting Information [Line Items]      
Asset 56,635,660   60,862,072
Corporate and Other | Canada | JV Properties      
Segment Reporting Information [Line Items]      
Asset 31,300,000   $ 28,500,000
Income (loss) from operations $ 400,000 $ 200,000  
[1] Other than our investments in and advances to Managed REITs, substantially all of our investments in real estate facilities and intangible assets as of December 31, 2022 and March 31, 2023, respectively, were associated with our self storage platform
[2] Included in the assets of the Self Storage segment as of March 31, 2023 and December 31, 2022 was approximately $52.2 million and $52.2 million of goodwill, respectively. Additionally, as of March 31, 2023 and December 31, 2022, there were no accumulated impairment charges to goodwill within the Self Storage segment.