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Real Estate Owned (Details Textual) (USD $)
 3 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2012
Communities
States
Apartment_Homes
Jun. 30, 2011
Jun. 30, 2012
Communities
States
Apartment_Homes
Jun. 30, 2011
Apr. 27, 2012
Apr. 27, 2012
Unconsolidated Joint Venture Four Texas [Member]
Corporate Joint Venture [Member]
Apartment_Homes
Communities
Real Estate Owned (Textual) [Abstract]            
Number of owned and consolidated community by the Company 145   145      
Number of states in which there are owned and consolidated communities 10   10      
Number of apartment homes owned and consolidated by the Company 41,681   41,681      
Equity method investment, ownership percent           80.00%
Joint Venture Number of Operating Communities Owned           2
Joint Venture Number of Apartment Homes in Operating Communities           633
Payments to Acquire Businesses and Interest in Affiliates           $ 11,700,000
Business Acquisition, Purchase Price Allocation, Property         10,100,000  
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment         35,900,000  
Business Acquisition, Purchase Price Allocation, Equipment         1,500,000  
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets         1,500,000  
Business Acquisition, Purchase Price Allocation, Liabilities Assumed         38,100,000  
Development costs excluding direct costs and capitlized interest 2,000,000 1,800,000 4,700,000 5,900,000    
Interest capitalized during period $ 5,100,000 $ 3,500,000 $ 10,000,000 $ 6,100,000