XML 60 R48.htm IDEA: XBRL DOCUMENT v3.7.0.1
Dispositions - Additional Information (Details)
May 03, 2017
USD ($)
Mar. 31, 2017
ft²
Jan. 12, 2017
USD ($)
ft²
Long Lived Assets Held For Sale [Line Items]      
Area of office and retail properties | ft²   12,500,000  
Waterview [Member]      
Long Lived Assets Held For Sale [Line Items]      
Area of office and retail properties | ft²     636,768
Sale agreement amount     $ 460,000,000
Waterview [Member] | Subsequent Event [Member]      
Long Lived Assets Held For Sale [Line Items]      
Sale agreement amount $ 460,000,000    
Net proceeds from sale of property 457,000,000    
Gain on sale of property $ 110,000,000