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Investments in Real Estate - Additional Information (Detail)
3 Months Ended
Feb. 27, 2017
USD ($)
Property
Mar. 31, 2017
USD ($)
Property
Dec. 31, 2016
USD ($)
Real Estate Properties [Line Items]      
Number of multifamily properties owned | Property   47  
Number of units located with multifamily properties | Property   13,198  
Real estate held for sale (see Note 3)   $ 61,102,000 $ 60,786,000
Acquisition of real estate properties   28,700,000  
Purchase price allocation adjustments   $ 0  
Tampa , Florida | Lakes of Northdale      
Real Estate Properties [Line Items]      
Real estate held for sale (see Note 3) $ 29,750,000    
Number of multifamily property acquired | Property 216    
Acquisition of real estate properties $ 29,750,000