Quarterly report pursuant to Section 13 or 15(d)

Recent Transactions (Acquisitions) (Narrative) (Details)

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Recent Transactions (Acquisitions) (Narrative) (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Oct. 23, 2015
USD ($)
ft²
Apr. 01, 2015
USD ($)
item
Oct. 31, 2015
Sep. 30, 2015
USD ($)
item
Sep. 30, 2015
USD ($)
item
Sep. 30, 2015
USD ($)
item
Sep. 30, 2014
USD ($)
Dec. 31, 2017
item
Real Estate Properties [Line Items]                
Purchase price of property           $ 59,700,000 $ 77,109,000  
Subsequent Event [Member]                
Real Estate Properties [Line Items]                
Acquisition expected completion date     fourth quarter of 2015          
City Square Project [Member]                
Real Estate Properties [Line Items]                
Number of units | item   365            
Purchase price of property   $ 3,100,000            
Contingent consideration   $ 1,250,000            
Total project costs       $ 92,500,000   92,500,000    
Costs of the project incurred         $ 7,100,000 7,100,000    
Transaction costs       $ 111,000 $ 111,000 $ 111,000    
City Square Project Phase One [Member]                
Real Estate Properties [Line Items]                
Number of units | item       237 237 237    
City Square Project Phase Two [Member] | Scenario, Forecast [Member]                
Real Estate Properties [Line Items]                
Number of units | item               128
Edison [Member] | Subsequent Event [Member]                
Real Estate Properties [Line Items]                
Area of property (in square feet) | ft² 196,000              
Purchase price of property $ 53,100,000