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Real Estate Facilities - Schedule 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, beginning balance | $ 1,887,205,645 | $ 1,593,623,628 |
Facility acquisitions | 23,696,536 | 298,341,568 | $ 371,507,610
Acquisitions | 23,696,536 |  |
Other facility acquisitions |  | 69,981,850 | 15,689,143
Impact of foreign exchange rate changes and other | 4,342,673 |  |
Impact of foreign exchange rate changes | 4,342,673 | (12,984,154) | (138,457)
Improvements and additions | 9,501,518 | 8,224,603 |
Real estate facilities, ending balance | 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)
Impact of foreign exchange rate changes and other | (541,715) | 1,644,260 | 71,937
Impact of foreign exchange rate changes and other | (541,715) |  |
Accumulated depreciation, ending balance | $ (255,844,284) | (202,682,688) | $ (155,926,875)
SSGT II Merger Agreement |  |  |
Real estate facilities |  |  |
Facility acquisitions |  | $ 228,359,718 |

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