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Organization, Basis of Presentation and Significant Accounting Policies (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
state
community
home
Jan. 01, 2019
USD ($)
Accounting Policies [Abstract]    
Number of operating apartment communities | community 273  
Number of apartment homes included in operating apartment communities owned | home 79,161  
Number of states where operating apartment communities owned are located | state 12  
Number of Communities with Apartments under Reconstruction | community 7  
Number of Apartment Homes under Reconstruction | home 3,026  
Number of owned communities under construction | community 21  
Expected number of apartment homes under construction | home 7,023  
Communities under development rights | community 28  
Estimated number of apartment homes in communities to be developed | home 9,004  
Real Estate Properties [Line Items]    
Operating lease assets | $ $ 100,377  
Operating lease obligation | $ $ 117,938  
Accounting Standards Update 2016-02    
Real Estate Properties [Line Items]    
Operating lease assets | $   $ 122,276
Operating lease obligation | $   $ 122,276