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Investments in Real Estate - Additional Information (Detail)
9 Months Ended
Oct. 25, 2017
USD ($)
Property
Sep. 30, 2017
USD ($)
Property
Dec. 31, 2016
USD ($)
Real Estate Properties [Line Items]      
Number of multifamily properties owned | Property   50  
Number of units located with multifamily properties | Property   13,729  
Real estate held for sale | $   $ 22,031,000 $ 60,786,000
Purchase price allocation adjustments | $   $ 0  
Number of property acquired | Property   1,621  
Acquisition of real estate properties | $   $ 169,156,000  
Baton Rouge, LA | Live Oak Trace | Subsequent Event      
Real Estate Properties [Line Items]      
Number of property acquired | Property 264    
Acquisition of real estate properties | $ $ 28,501,000