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Variable Interest Entities (Details Textual)
$ in Millions
Sep. 30, 2016
Property
Dec. 31, 2015
USD ($)
Entity
Units
Property
Napico Portfolio [Member]    
Variable Interest Entity [Line Items]    
Number of Apartment Communities | Property 2  
Variable Interest Entity, Primary Beneficiary [Member] | Accounting Standards Update 2015-02 [Member]    
Variable Interest Entity [Line Items]    
Number of consolidated variable interest entities | Entity   14
Number of Apartment Communities | Property   18
Number of apartment homes in apartment communities | Units   6,186
Assets | $   $ 885.9
Liabilities | $   $ 645.3