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Segment Disclosures - Additional Information (Detail)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Segment
Sep. 30, 2022
USD ($)
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   2    
Asset $ 1,891,250,476   $ 1,891,250,476   $ 1,947,217,387 [1] $ 1,618,292,776 [1]  
Income (loss) from operations 18,139,750 $ 12,898,743 53,650,711 $ 49,516,377 65,868,858 16,507,750 $ (21,140,210)
Self Storage              
Segment Reporting Information [Line Items]              
Asset 1,802,026,290   1,802,026,290   1,820,922,309 [2] 1,546,835,094 [2]  
Income (loss) from operations 23,486,236 19,404,362 67,866,383 55,029,270 77,638,371 57,941,486 33,495,796
Self Storage | Canada              
Segment Reporting Information [Line Items]              
Asset 168,000,000   168,000,000   170,000,000 185,000,000  
Revenues 5,700,000 $ 5,500,000 16,600,000 16,000,000 21,500,000 19,200,000 14,700,000
Corporate and Other              
Segment Reporting Information [Line Items]              
Asset 51,960,520   51,960,520   60,862,072 49,750,356  
Income (loss) from operations         (29,167,841) $ (24,008,118) $ (16,992,300)
Corporate and Other | Canada | JV Properties              
Segment Reporting Information [Line Items]              
Asset $ 34,700,000   34,700,000   $ 28,500,000    
Income (loss) from operations     $ 1,200,000 $ 600,000      
[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.