Investments in Unconsolidated Entities - Additional Information (Details) - USD ($)	1 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2020	Jan. 31, 2020	Apr. 30, 2019
Vantage At Westover Hills [Member]
Schedule Of Equity Method Investments [Line Items]
Equity commitment of fund construction				$ 7,300,000
Vantage At Waco [Member]
Schedule Of Equity Method Investments [Line Items]
Cash received	$ 10,300,000
Income on sale of properties	$ 931,000
Vantage At Conroe [Member]
Schedule Of Equity Method Investments [Line Items]
Equity commitment of fund construction					$ 9,000,000.0
Minimum [Member] | ATAX Vantage Holdings, LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Return on investment period		2 years
Maximum [Member] | Vantage At Waco [Member] | Scenario Forecast [Member]
Schedule Of Equity Method Investments [Line Items]
Cash received			$ 586,000
Maximum [Member] | ATAX Vantage Holdings, LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Return on investment period		3 years