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Investments in Real Estate - Additional Information (Detail)
1 Months Ended 6 Months Ended
Jul. 31, 2018
USD ($)
Property
Jun. 30, 2018
USD ($)
Property
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Real Estate Properties [Line Items]        
Number of multifamily properties owned   56    
Number of units located with multifamily properties   15,280    
Real estate properties held for sale | $   $ 141,132,000   $ 0
Number of property acquired   1,263    
Acquisition of real estate properties | $   $ 89,547,000 $ 84,417,000  
Subsequent Event        
Real Estate Properties [Line Items]        
Number of real estate properties acquired 2      
Bridgeview | Tampa, FL | Subsequent Event        
Real Estate Properties [Line Items]        
Number of property acquired 348      
Acquisition of real estate properties | $ $ 43,000,000      
Collier Park | Columbus, OH | Subsequent Event        
Real Estate Properties [Line Items]        
Number of property acquired 232      
Acquisition of real estate properties | $ $ 21,200,000      
Held-for-sale        
Real Estate Properties [Line Items]        
Number of multifamily properties owned   5    
Number of units located with multifamily properties   1,348    
Real estate properties held for sale | $   $ 141,132,000   $ 0