Disposals and Discontinued Operations (Details Textual) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2014 Property Units	Mar. 31, 2013 Property Units	Dec. 31, 2013 Property Units
Disposals and Discontinued Operations (Textual) [Abstract]
Number of consolidated properties disposed	5	3	29
Number of apartment homes in consolidated properties disposed	1,606	66	6,953
Gain on dispositions of real estate, net of tax	$ 69,492,000	$ 0
Prepayment penalties treated as reduction of gain upon repayment of property loans collateralized by properties sold	5,800,000	300,000
Non-recourse property debt assumed in connection with real estate dispositions	$ 29,800,000	$ 2,100,000