Real Estate Assets - Condensed Balance Sheet at Acquisition Date (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2016
Real Estate [Line Items]
Other assets	$ 7,348,302	$ 8,795,192
Total Assets	1,069,767,999	944,113,674
Accounts payable, accrued expenses and other liabilities	8,494,227	7,255,327
Net assets	313,840,270	280,129,205
Total Liabilities and Partnersʼ Capital	$ 1,069,767,999	$ 944,113,674
Jade Park [Member]
Real Estate [Line Items]
Land			$ 2,292,035
Buildings and improvements			7,244,534
In-place lease assets (included in other assets)			463,431
Other assets			18,126
Total Assets			10,018,126
Accounts payable, accrued expenses and other liabilities			135,326
Net assets			9,882,800
Total Liabilities and Partnersʼ Capital			$ 10,018,126