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Subsequent Events - Additional Information (Detail)
$ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2015
USD ($)
Apartment
Sep. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Subsequent Event [Line Items]      
Purchase Price   $ 29,900 $ 190,743
Subsequent Event | DISTRICT OF COLUMBIA | Apartment Building [Member]      
Subsequent Event [Line Items]      
Ownership percentage 93.70%    
Number of units acquired | Apartment 327    
Purchase Price $ 75,000    
Equity investment $ 18,700    
Subsequent Event | CALIFORNIA | Shopping Centers [Member]      
Subsequent Event [Line Items]      
Ownership percentage 90.00%    
Purchase Price $ 37,800    
Equity investment $ 11,900