Commitments and Contingencies - Additional Information (Details)	3 Months Ended
	Mar. 31, 2017 USD ($) Property ApartmentUnit	Dec. 31, 2016 USD ($)
Accrual for Environmental Loss Contingencies	$ 300,000	$ 4,700,000
Loss Contingency Accrual, Period Increase (Decrease)	0
Loss Contingency Accrual	$ 1,000,000
Projects in various stages of development | Property	5
Units in various stages of development | ApartmentUnit	1,720
Consolidated Project Under Development Commitment Fund	$ 191,200,000
Various stages of development with estimated completion dates ranging through September 30, 2017	Dec. 31, 2018
Partially Owned Properties – Unconsolidated
Number Of Unconsolidated Projects | Property	2