Organization, Basis of Presentation and Significant Accounting Policies (Details)	Sep. 30, 2014 state home community
Organization and Basis of Presentation
Number of operating apartment communities owned	247
Number of apartment homes included in operating apartment communities owned	73,182
Number of states where operating apartment communities owned are located	11
Number of communities with apartments under reconstruction	6
Number of apartment homes under reconstruction	2,094
Number of owned communities under construction	27
Expected number of apartment homes under construction	9,151
Communities under development rights	39
Estimated number of apartment homes in communities to be developed	10,707