Investment in Unconsolidated Entities - Summary of Investments in Unconsolidated Entities (Details)	3 Months Ended
	Mar. 31, 2018 USD ($) Unit	Dec. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)
Schedule Of Equity Method Investments [Line Items]
Carrying Value	$ 52,809,740	$ 39,608,927
Maximum Remaining Equity Commitment	$ 17,673,962
Vantage at Corpus Christi [Member] | Corpus Christi T X [Member]
Schedule Of Equity Method Investments [Line Items]
Units (Unaudited) | Unit	288
Month Commitment Executed	March 2016
Construction Completion Date	2017-08
Carrying Value	$ 9,250,356	9,178,139
Maximum Remaining Equity Commitment	$ 1,550,000
Vantage At Waco [Member] | Waco T X [Member]
Schedule Of Equity Method Investments [Line Items]
Units (Unaudited) | Unit	288
Month Commitment Executed	August 2016
Construction Completion Date	2018-01
Carrying Value	$ 8,968,621	8,748,091
Maximum Remaining Equity Commitment	$ 1,592,039
Vantage At Boerne [Member] | Boerne T X [Member]
Schedule Of Equity Method Investments [Line Items]
Units (Unaudited) | Unit	288
Month Commitment Executed	August 2016
Construction Completion Date	2017-12
Carrying Value	$ 8,481,359	8,272,810
Maximum Remaining Equity Commitment	$ 1,475,936
Vantage At Panama City Beach [Member]
Schedule Of Equity Method Investments [Line Items]
Carrying Value			$ 11,700,000
Vantage At Panama City Beach [Member] | Panama City Beach F L [Member]
Schedule Of Equity Method Investments [Line Items]
Units (Unaudited) | Unit	288
Month Commitment Executed	March 2017
Carrying Value	$ 10,610,314	10,349,416
Maximum Remaining Equity Commitment	$ 1,996,500
Vantage At Powdersville [Member] | Powdersville S C [Member]
Schedule Of Equity Method Investments [Line Items]
Units (Unaudited) | Unit	288
Month Commitment Executed	November 2017
Carrying Value	$ 5,679,234	$ 3,060,471
Maximum Remaining Equity Commitment	5,183,625
Vantage At Stone Creek [Member]
Schedule Of Equity Method Investments [Line Items]
Carrying Value	$ 7,100,000
Vantage At Stone Creek [Member] | Omaha, NE [Member]
Schedule Of Equity Method Investments [Line Items]
Units (Unaudited) | Unit	294
Month Commitment Executed	March 2018
Carrying Value	$ 4,540,038
Maximum Remaining Equity Commitment	2,551,284
Vantage At Bulverde [Member]
Schedule Of Equity Method Investments [Line Items]
Carrying Value	$ 8,600,000
Vantage At Bulverde [Member] | Bulverde T X [Member]
Schedule Of Equity Method Investments [Line Items]
Units (Unaudited) | Unit	288
Month Commitment Executed	March 2018
Carrying Value	$ 5,279,818
Maximum Remaining Equity Commitment	$ 3,324,578