Schedule of Activity in Real Estate Facilities (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Jan. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Real estate facilities        
Real estate facilities, beginning balance $ 1,210,102,582 $ 1,210,102,582 $ 1,173,825,368  
Impact of foreign exchange rate changes   (138,457) 4,147,798 $ 6,582,603
Facilities acquired through merger with SSTIV   324,344,636    
Facility acquisitions 371,507,610 47,162,974   351,070,238
Improvements and additions [1]   12,151,893    
Other facility acquisitions [2]   15,689,143    
Disposition due to deconsolidation [2]   (15,689,143)    
Acquisitions, additions and other [3]     32,129,416  
Real estate facilities, ending balance   1,593,623,628 1,210,102,582 1,173,825,368
Accumulated depreciation        
Accumulated depreciation, beginning balance $ (115,903,045) (115,903,045) (83,692,491) (54,264,685)
Depreciation expense   (40,158,233) (31,711,102) (29,188,668)
Impact of foreign exchange rate changes   71,937 (499,452) (441,554)
Disposition due to deconsolidation [2]   62,466    
Accumulated depreciation, ending balance   $ (155,926,875) $ (115,903,045) $ (83,692,491)
[1] Included herein is an addition to our Riverview, Florida property of approximately $2.3 million, which added approximately 25,400 net rentable square feet and approximately 150 additional units, and opened in June of 2021. The remainder consists primarily of solar panel installations, LED lighting conversions, and other general capital improvements.
[2] Such activity represents the acquisition of a property completed by SST VI OP, which as of the acquisition date was consolidated within our consolidated financial statements. On May 1, 2021, we deconsolidated SST VI OP as we were no longer the primary beneficiary, which resulted in the removal of such facility from our consolidated balance sheet. Our investment in SST VI OP is now included within “Investments in and advances to managed REITs” within our consolidated balance sheet.
[3] Such amount includes approximately $13 million of construction in process that was placed into service during the year ended December 31, 2020.