Investment in Unconsolidated Entities - Summary of Investments in Unconsolidated Entities (Details)	9 Months Ended
	Sep. 30, 2018 USD ($) Unit	Dec. 31, 2017 USD ($)
Schedule Of Equity Method Investments [Line Items]
Carrying Value	$ 80,294,647	$ 39,608,927
Maximum Remaining Equity Commitment	$ 22,769,760
Vantage at Corpus Christi [Member] | Corpus Christi T X [Member]
Schedule Of Equity Method Investments [Line Items]
Units | Unit	288
Month Commitment Executed	March 2016
Construction Completion Date	2017-08
Carrying Value	$ 8,610,674	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 | Unit	288
Month Commitment Executed	August 2016
Construction Completion Date	2018-01
Carrying Value	$ 9,337,166	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 | Unit	288
Month Commitment Executed	August 2016
Construction Completion Date	2017-12
Carrying Value	$ 8,830,000	8,272,810
Maximum Remaining Equity Commitment	$ 1,475,936
Vantage At Panama City Beach [Member] | Panama City Beach F L [Member]
Schedule Of Equity Method Investments [Line Items]
Units | Unit	288
Month Commitment Executed	March 2017
Construction Completion Date	2018-06
Carrying Value	$ 11,152,005	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 | Unit	288
Month Commitment Executed	November 2017
Carrying Value	$ 11,252,239	$ 3,060,471
Vantage At Stone Creek [Member] | Omaha, NE [Member]
Schedule Of Equity Method Investments [Line Items]
Units | Unit	294
Month Commitment Executed	March 2018
Carrying Value	$ 7,386,856
Vantage At Bulverde [Member] | Bulverde T X [Member]
Schedule Of Equity Method Investments [Line Items]
Units | Unit	288
Month Commitment Executed	March 2018
Carrying Value	$ 8,956,732
Vantage at Germantown [Member] | Germantown, TN [Member]
Schedule Of Equity Method Investments [Line Items]
Units | Unit	288
Month Commitment Executed	June 2018
Carrying Value	$ 4,402,208
Maximum Remaining Equity Commitment	$ 6,119,505
Vantage At Murfreesboro [Member] | Murfreesboro, TN [Member]
Schedule Of Equity Method Investments [Line Items]
Units | Unit	288
Month Commitment Executed	September 2018
Carrying Value	$ 5,499,398
Maximum Remaining Equity Commitment	$ 6,755,836
Vantage At Coventry [Member] | Omaha, NE [Member]
Schedule Of Equity Method Investments [Line Items]
Units | Unit	288
Month Commitment Executed	September 2018
Carrying Value	$ 4,867,369
Maximum Remaining Equity Commitment	$ 3,279,944