Debt - Schedule of Advances Under Credit Facility, by Property (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Subtotal	$ 697,427,039
Total notes payable, net	693,501,574	$ 875,785,938
Revolving Credit Facility [Member] | Refinanced PNC Bank Credit Facility [Member]
Debt Instrument [Line Items]
Subtotal	52,656,750	91,067,250
Deferred financing costs, net on credit facility	(293,290)	(845,152)
Total notes payable, net	52,363,460	90,222,098
Accumulated amortization related to deferred financing costs	(294,250)	(390,241)
Carrington Park at Huffmeister [Member] | Revolving Credit Facility [Member] | Refinanced PNC Bank Credit Facility [Member]
Debt Instrument [Line Items]
Subtotal	0	20,430,500
Carrington Place [Member] | Revolving Credit Facility [Member] | Refinanced PNC Bank Credit Facility [Member]
Debt Instrument [Line Items]
Subtotal	27,535,500	27,535,500
Carrington at Champion Forest [Member] | Revolving Credit Facility [Member] | Refinanced PNC Bank Credit Facility [Member]
Debt Instrument [Line Items]
Subtotal	25,121,250	25,121,250
Oak Crossing [Member] | Revolving Credit Facility [Member] | Refinanced PNC Bank Credit Facility [Member]
Debt Instrument [Line Items]
Subtotal	$ 0	$ 17,980,000