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Hurricane Related (Recoveries)/Charges, Net (Details) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 3 Months Ended 4 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Mar. 31, 2013
New York Properties [Member]
Dec. 31, 2012
New York Properties [Member]
Communities
Apartment_Homes
Dec. 31, 2012
Hurricane Sandy [Member]
Mar. 31, 2013
Hurricane Sandy [Member]
Impairment and Repair and Cleanup Costs [Member]
Apr. 30, 2013
Hurricane Sandy [Member]
Impairment and Repair and Cleanup Costs [Member]
Mar. 31, 2013
Hurricane Sandy [Member]
Business Interruption [Member]
Apr. 30, 2013
Hurricane Sandy [Member]
Business Interruption [Member]
Apr. 30, 2013
Hurricane Sandy [Member]
FY 2012 [Member]
Business Interruption [Member]
Apr. 30, 2013
Hurricane Sandy [Member]
FY 2013 [Member]
Business Interruption [Member]
Dec. 31, 2012
Rent Concessions [Member]
Dec. 31, 2012
Rent not contractually receivable [Member]
Number of Communities Owned         3                  
Number of Apartments Owned         1,706                  
Impairment of Long-Lived Assets Held-for-use       $ 0 $ 9,000,000                  
Other Cost and Expense, Operating 1,643,000 1,383,000     10,400,000                  
Total Estimated Insurance Recovery           14,500,000                
Proceeds from Insurance Settlement, Operating Activities             8,400,000   2,500,000 3,000,000 2,800,000 187,000    
Estimated Insurance Recoveries               4,600,000   548,000        
Business Interruption Costs     $ 4,400,000                   $ 3,600,000 $ 800,000