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ORGANIZATION (Details)
$ in Thousands, ft² in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 15, 2015
USD ($)
Sep. 30, 2016
USD ($)
ft²
property
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
ft²
property
Sep. 30, 2015
USD ($)
Dec. 31, 2015
Real Estate Properties [Line Items]            
Area of real estate property (in sq ft) | ft²   14.8   14.8    
Noncontrolling interest percentage   6.00%   6.00%    
Capital investment, in cash $ 225,000          
Transaction costs 21,900 $ 223 $ 151 $ 307 $ 22,437  
Costs contingent upon completion of separation 17,400     $ 0 $ 17,403  
Transaction costs contingent upon completion of the separation $ 4,500          
Vornado            
Real Estate Properties [Line Items]            
Noncontrolling interest percentage 5.40%         94.00%
Affiliated entity | Vornado            
Real Estate Properties [Line Items]            
Spinoff ratio 0.50          
Affiliated entity | VRLP            
Real Estate Properties [Line Items]            
Percentage of common shares distributed 100.00%          
Spinoff ratio 0.5          
Warehouses            
Real Estate Properties [Line Items]            
Number of real estate properties | property   1   1    
Wholly owned properties | Shopping Center            
Real Estate Properties [Line Items]            
Number of real estate properties | property   79   79    
Wholly owned properties | Mall            
Real Estate Properties [Line Items]            
Number of real estate properties | property   3   3