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Schedule III - Real Estate and Accumulated Depreciation - Changes in Real Estate Assets (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Balance, beginning of period $ 11,929,276,453 $ 11,877,190,495 $ 12,653,444,998
Acquisitions 10,448,877 43,970,631 3,420,020
Improvements 210,389,543 404,210,910 554,408,568
Sales and assets held-for-sale (30,764,579) (307,607,731) (836,988,450)
Transfers to operating lease right-of-use assets, net 0 (8,525,554) 0
Transfers to unconsolidated joint ventures 0 0 (315,728,832)
Adjustment for fully depreciated assets (45,041,556) (43,080,882) (72,992,791)
Adjustment of property carrying values (5,481,589) (36,881,416) (108,373,018)
Balance, end of period $ 12,068,827,149 $ 11,929,276,453 $ 11,877,190,495