Investments in Unconsolidated Entities - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2021	May 31, 2021	Apr. 30, 2021
Vantage at Loveland [Member]
Schedule Of Equity Method Investments [Line Items]
Equity commitment of fund construction			$ 16.3
Vantage at Helotes [Member]
Schedule Of Equity Method Investments [Line Items]
Equity commitment of fund construction		$ 12.6
Vantage at Fair Oaks [Member]
Schedule Of Equity Method Investments [Line Items]
Equity commitment of fund construction	$ 11.0