Commitments and Contingencies - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) Property ApartmentUnit Agreement	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Commitments And Contingencies [Abstract]
Projects in various stages of development	2
Partially owned projects in various stages of development	1
Units in various stages of development | ApartmentUnit	824
Consolidated project under development commitment fund | $	$ 191.7
Various stages of development with estimated completion dates ranging through September 30, 2021	Sep. 30, 2021
Number of projects completed and stabilized	2
Number of joint venture agreements | Agreement	2
Compensation expense, recognized | $	$ 0.5	$ 0.4	$ 0.3