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Investments in Real Estate - Additional Information (Detail)
$ in Thousands
9 Months Ended
Oct. 15, 2015
USD ($)
Sep. 17, 2015
USD ($)
Property
May. 01, 2015
USD ($)
Property
Sep. 30, 2015
USD ($)
Property
Sep. 30, 2014
USD ($)
Real Estate Properties [Line Items]          
Number of multifamily properties owned | Property       50  
Number of units located with multifamily properties | Property       14,044  
Acquisition of real estate properties       $ 24,746 $ 178,158
Investments in real estate       $ 707,268  
Indianapolis Indiana          
Real Estate Properties [Line Items]          
Number of multifamily property acquired | Property     236    
Acquisition of real estate properties     $ 25,250    
Indianapolis Indiana | Real Estate Investment          
Real Estate Properties [Line Items]          
Investments in real estate     $ 25,250    
Trade Street Residential, Inc.          
Real Estate Properties [Line Items]          
Number of multifamily property acquired | Property   4,989      
Investments in real estate   $ 682,237      
Number of properties acquired | Property   19      
Trade Street Residential, Inc. | Subsequent Event          
Real Estate Properties [Line Items]          
Parcel of land sold $ 3,350