Commitments and Contingencies - Additional Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($) Property ApartmentUnit
Commitments And Contingencies [Abstract]
Projects in various stages of development | Property	3
Units in various stages of development | ApartmentUnit	691
Consolidated project under development commitment fund | $	$ 354.7
Various stages of development with estimated completion dates ranging through September 30, 2021	Sep. 30, 2021