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Investments in Real Estate - Additional Information (Detail)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 22, 2015
USD ($)
Property
Oct. 15, 2015
USD ($)
Sep. 17, 2015
USD ($)
Property
May 01, 2015
USD ($)
Property
Jan. 31, 2018
USD ($)
Property
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Property
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Real Estate Properties [Line Items]                  
Number of multifamily properties owned | Property             52    
Investment in real estate             $ 0 $ 60,786  
Number of property acquired | Property             2,340    
Acquisition of real estate properties             $ 220,254   $ 24,746
Net assets acquired             86,723    
Fair value of equity consideration transferred           $ 1,654      
Gains (losses) on TSRE merger and property acquisitions     $ 64,604         732 $ 64,604
Purchase Price             243,585    
Number of Multifamily Property Disposed | Property 1                
Sale Price of Real Estate Property $ 33,600           $ 86,800 88,000  
Gain (loss) on sale of assets $ 6,420 $ 8              
Parcel of land sold   $ 3,350              
TSRE Properties                  
Real Estate Properties [Line Items]                  
Gains (losses) on TSRE merger and property acquisitions               $ 732  
Trade Street Residential, Inc.                  
Real Estate Properties [Line Items]                  
Number of property acquired | Property     4,989            
Number of properties acquired | Property     19            
Net assets acquired     $ 328,240            
Consideration transferred     263,636            
Cash consideration for merger     139,781            
Limited Partner | Trade Street Residential, Inc.                  
Real Estate Properties [Line Items]                  
Fair value of equity consideration transferred     13,998            
Common Shares | Trade Street Residential, Inc.                  
Real Estate Properties [Line Items]                  
Fair value of equity consideration transferred     $ 109,857            
Indianapolis, IN                  
Real Estate Properties [Line Items]                  
Number of property acquired | Property       236          
Acquisition of real estate properties       $ 25,250          
Indianapolis, IN and Atlanta, GA | Creekside and Hartshire | Subsequent Event                  
Real Estate Properties [Line Items]                  
Number of property acquired | Property         716        
Purchase Price         $ 71,498        
Columbus, OH | The Chelsea | Subsequent Event                  
Real Estate Properties [Line Items]                  
Number of property acquired | Property         312        
Purchase Price         $ 36,750