Schedule III - Real Estate and Accumulated Depreciation - Changes in Real Estate Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Balance, beginning of period	$ 11,877,190,495	$ 12,653,444,998	$ 12,008,075,148
Acquisitions	43,970,631	3,420,020	438,125,265
Improvements	404,210,910	554,408,568	414,955,609
Transfers from unconsolidated joint ventures	0	0	329,194,717
Change in exchange rate	0	0	1,035,816
Sales	(190,859,948)	(767,246,512)	(315,954,464)
Transfers to operating lease right-of-use assets, net	(8,525,554)	0	0
Transfers to unconsolidated joint ventures	0	(315,728,832)	0
Assets held for sale	(116,747,783)	(69,741,938)	(56,187,719)
Adjustment for fully depreciated assets	(43,080,882)	(72,992,791)	(107,660,366)
Adjustment of property carrying values	(36,881,416)	(108,373,018)	(58,139,008)
Balance, end of period	$ 11,929,276,453	$ 11,877,190,495	$ 12,653,444,998