Organization, Basis of Presentation and Significant Accounting Policies (Details)	Mar. 31, 2015 state home community
Organization and Basis of Presentation
Number of operating apartment communities	254
Number of apartment homes included in operating apartment communities owned	74,178
Number of states where operating apartment communities owned are located	11
Number of communities with apartments under reconstruction	7
Number of apartment homes under reconstruction	2,734
Number of owned communities under construction	25
Expected number of apartment homes under construction	7,428
Communities under development rights	35
Estimated number of apartment homes in communities to be developed	9,985