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Schedule III Summary of Activity in Real Estate Facilities (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Real estate facilities |  |  |
Real estate facilities, Balance at beginning of year | $ 1,887,205,645 | $ 1,593,623,628 | $ 1,210,102,582
Facility acquisitions | 23,696,536 | 298,341,568 | 371,507,610
Impact of foreign exchange rate changes | 4,342,673 | (12,984,154) | (138,457)
Improvements and additions | 9,501,518 | 8,224,603 | 12,151,893
Other facility acquisitions |  | 69,981,850 | 15,689,143
Disposition due to deconsolidation |  |  | (15,689,143)
Real estate facilities, Balance at end of year | 1,924,746,372 | 1,887,205,645 | 1,593,623,628
Accumulated depreciation |  |  |
Accumulated depreciation, beginning balance | (202,682,688) | (155,926,875) | (115,903,045)
Depreciation expense | (52,619,881) | (48,400,073) | (40,158,233)
Disposition due to deconsolidation |  |  | 62,466
Impact of foreign exchange rate changes and other | (541,715) | 1,644,260 | 71,937
Accumulated depreciation, ending balance | (255,844,284) | (202,682,688) | (155,926,875)
Construction in process |  |  |
Construction in process, Balance at beginning of year | 4,490,926 | 1,799,004 | 1,761,303
Net additions and assets placed into service | 1,486,020 | 2,691,922 | 37,701
Construction in process, Balance at end of year | 5,976,946 | 4,490,926 | 1,799,004
Real estate facilities, net | $ 1,674,879,034 | $ 1,689,013,883 | $ 1,439,495,757

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