Investment in Unconsolidated Entities - Summary of Investments in Unconsolidated Entities (Details)	6 Months Ended
	Jun. 30, 2018 USD ($) Unit	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)
Schedule Of Equity Method Investments [Line Items]
Carrying Value	$ 60,494,767		$ 39,608,927
Maximum Remaining Equity Commitment	$ 21,335,067
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	$ 9,035,674		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	$ 9,194,710		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	$ 8,695,165		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 | Unit	288
Month Commitment Executed	March 2017
Construction Completion Date	2018-06
Carrying Value	$ 10,877,788		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	$ 7,488,224		$ 3,060,471
Maximum Remaining Equity Commitment	$ 3,534,815
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 | Unit	294
Month Commitment Executed	March 2018
Carrying Value	$ 5,226,898
Maximum Remaining Equity Commitment	$ 1,984,179
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 | Unit	288
Month Commitment Executed	March 2018
Carrying Value	$ 6,790,825
Maximum Remaining Equity Commitment	1,959,428
Vantage at Germantown [Member]
Schedule Of Equity Method Investments [Line Items]
Carrying Value	$ 10,400,000
Vantage at Germantown [Member] | Germantown, TN [Member]
Schedule Of Equity Method Investments [Line Items]
Units | Unit	288
Month Commitment Executed	June 2018
Carrying Value	$ 3,185,483
Maximum Remaining Equity Commitment	$ 7,242,170