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Organization - Additional Information (Detail)
$ / shares in Units, $ in Billions
Sep. 17, 2015
USD ($)
$ / shares
shares
Dec. 31, 2015
Property
Class Of Stock [Line Items]    
Number of units located with multifamily properties | Property   13,724
Number of multifamily properties owned | Property   49
Trade Street Residential, Inc.    
Class Of Stock [Line Items]    
Common stock shares converted into right to receive cash | $ / shares $ 3.80  
Common stock shares converted into right to receive shares of IRT 0.4108  
Shares issued to acquire entity 15,110,994  
Trade Street Residential, Inc. | Limited Partner    
Class Of Stock [Line Items]    
Operating partnership units exchanged in merger 1,925,419  
Minimum    
Class Of Stock [Line Items]    
Expected total capitalization after merger | $ $ 1.4