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Subsequent Events - Additional Information (Detail)
$ in Thousands
May 04, 2018
USD ($)
a
Mar. 31, 2018
USD ($)
ft²
Dec. 31, 2017
USD ($)
Subsequent Event [Line Items]      
Area of real estate property (in square feet) | ft²   8,905,487  
Agreement values of real estate property for development | $   $ 1,453,360 $ 1,489,656
Subsequent Event [Member] | Overlake Plaza Redmond, WA [Member]      
Subsequent Event [Line Items]      
Area of land owned | a 15    
Subsequent Event [Member] | Overlake Plaza Redmond, WA [Member] | Multi-family [Member]      
Subsequent Event [Line Items]      
Area of real estate property (in square feet) | a 2.5    
Agreement values of real estate property for development | $ $ 16,000    
Subsequent Event [Member] | NewPark Mall Newark CA [Member]      
Subsequent Event [Line Items]      
Area of land owned | a 10    
Subsequent Event [Member] | NewPark Mall Newark CA [Member] | Multi-family [Member]      
Subsequent Event [Line Items]      
Area of real estate property (in square feet) | a 4.5    
Agreement values of real estate property for development | $ $ 20,000    
Subsequent Event [Member] | Tanforan Mall San Bruno, CA [Member]      
Subsequent Event [Line Items]      
Gross consideration | $ $ 42,000