Organization, Basis of Presentation and Significant Accounting Policies (Details)	Jun. 30, 2013 state home community
Organization and Basis of Presentation
Number of operating apartment communities owned	246
Number of apartment homes included in operating apartment communities owned	73,564
Number of states where operating apartment communities owned are located	12
Number of communities with apartments under reconstruction	6
Number of apartment homes under reconstruction	2,248
Number of owned communities under construction	27
Expected number of apartment homes under construction	7,935
Communities under development rights	47
Estimated number of apartment homes in communities to be developed	13,649