Significant Transactions (Details Textual 2) (USD $) In Millions, unless otherwise specified			12 Months Ended
	Dec. 31, 2013 Newly Acquired Redevelopment Property [Member]	Dec. 31, 2011 Newly Acquired Redevelopment Property [Member] Units	Dec. 31, 2011 Newly Acquired Conventional Properties [Member] Units Property
Business Acquisition [Line Items]
Number of homes in apartment communities		126
Minimum Expected Investment In Redevelopment Property	$ 101
Percentage Of Non Controlling Interests Acquired			50.00%
Number Of Real Estate Contiguous Communities			4
Number Of Homes In Real Estate Contiguous Properties			142