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Summary Accounting Policies (Details) (USD $)
 1 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 9 Months Ended 9 Months Ended
Feb. 28, 2014
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Sep. 30, 2014
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Dec. 31, 2013
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Sep. 30, 2014
Noxell Corporation industrial building, Joppa, Maryland
Jun. 30, 2014
Land - River Crossing Apartments, Sandy Springs, Georgia
Sep. 30, 2014
Land - River Crossing Apartments, Sandy Springs, Georgia
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Sep. 30, 2014
Consolidated JV
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Sep. 30, 2014
Consolidated JV
Minimum
Sep. 30, 2014
Consolidated JV
Maximum
Sep. 30, 2014
Unconsolidated JV
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Investment in Joint Ventures                    
Number of joint ventures with controlling interest             6      
Disposals of Properties                    
Number of properties sold 2                  
Contract Purchase Price   $ 32,864,000     $ 6,510,000 $ 6,510,000        
Number of apartment units in the complex purchased           196        
Maximum exposure to loss           6,626,000        
Carrying value of the land   569,817,000 567,358,000     6,516,000        
Unbilled rent receivable   12,442,000 13,743,000     110,000        
Restricted assets       0            
Land   162,976,000 153,529,000 3,805,000            
Building and improvements (net of depreciation)   406,841,000 413,829,000 8,081,000            
Cash       318,000            
Prepaid expenses and receivables       38,000            
Accrued expenses and other liabilities   10,641,000 7,790,000 123,000            
Non-controlling interest in joint ventures   $ 1,324,000 $ 1,158,000 $ 309,000            
Ownership interest in consolidated joint venture (as a percent)       95.00%       85.00% 95.00%  
Number of unconsolidated joint ventures   5 5             5
Reclassification                    
Number of properties sold and reclassified to discontinued operations 2