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Commitments and Contingencies - Additional Information (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
Property
ApartmentUnit
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Accrual for environmental loss contingencies $ 4,500,000    
Number of properties with environmental reserves | Property 3    
Littigation amount total payout $ 900,000    
Litigation reserve oustanding amount $ 0    
Projects in various stages of development | Property 3    
Units in various stages of development | ApartmentUnit 690    
Consolidated project under development commitment fund $ 414,100,000    
Various stages of development with estimated completion dates ranging through September 30, 2021 Sep. 30, 2021    
Total operating lease payments $ 27,800,000 $ 26,600,000 $ 26,200,000
Compensation expense, recognized $ 300,000 $ 400,000 $ 300,000
Partially Owned Properties – Unconsolidated      
Number of unconsolidated projects | Property 2