Quarterly report pursuant to Section 13 or 15(d)

Real Estate Transactions (Narrative) (Details)

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Real Estate Transactions (Narrative) (Details) (USD $)
0 Months Ended
Mar. 31, 2013
Alterra At Overlook Ridge IA [Member]
Jan. 18, 2013
Alterra At Overlook Ridge IA [Member]
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Apr. 04, 2013
Alterra At Overlook Ridge IB [Member]
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Apr. 10, 2013
19 Skyline Drive [Member]
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Real Estate Transactions [Line Items]        
Number of units   310 412  
Business acquisition, cash paid   $ 61,300,000 $ 88,000,000  
Transaction costs 56,000      
Area of property (in square feet)       248,400
Proceeds from the sale of property       $ 16,000,000