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TSRE Merger - Additional Information (Detail)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 17, 2015
USD ($)
Property
Sep. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Business Acquisition [Line Items]        
Gains (losses) on TSRE merger and property acquisitions $ 64,012 $ 64,012 $ 64,012 $ 2,882
Indebtedness   359,495 359,495  
Trade Street Residential, Inc.        
Business Acquisition [Line Items]        
Fair value of equity consideration transferred 123,855      
Indebtedness 359,495 $ 121,885 $ 121,885  
Paid indebtedness 237,610      
Acquisition expenses 12,530      
Expenses associated with extinguishing financing arrangement 23,219      
Expenses associated with employee separation $ 4,289      
Number of properties acquired | Property 19      
Trade Street Residential, Inc. | TSRE Properties        
Business Acquisition [Line Items]        
Gains (losses) on TSRE merger and property acquisitions $ 30,000      
Common Shares | Trade Street Residential, Inc.        
Business Acquisition [Line Items]        
Fair value of equity consideration transferred 109,857      
Gains (losses) on TSRE merger and property acquisitions 34,000      
Limited Partner | Trade Street Residential, Inc.        
Business Acquisition [Line Items]        
Fair value of equity consideration transferred $ 13,998