Investments in Unconsolidated Entities - Additional Information (Details) - USD ($)	1 Months Ended			3 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Equity Method Investments [Line Items]
Income on sale of properties						$ 4,051,429
Gain on sale of investments					$ 16,141,797	$ 2,904,087
Vantage At Panama City Beach [Member]
Schedule Of Equity Method Investments [Line Items]
Cash received		$ 22,700,000
Income on sale of properties		547,000
Gain on sale of investments		$ 10,500,000
Vantage At Panama City Beach [Member] | Maximum [Member] | Scenario Forecast [Member]
Schedule Of Equity Method Investments [Line Items]
Cash received				$ 325,000
Vantage At Boerne [Member]
Schedule Of Equity Method Investments [Line Items]
Cash received	$ 15,200,000
Income on sale of properties	1,200,000
Gain on sale of investments	$ 5,700,000
Vantage at Corpus Christi [Member]
Schedule Of Equity Method Investments [Line Items]
Cash received			$ 12,100,000
Income on sale of properties			590,000
Gain on sale of investments			$ 2,900,000