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RELATED PARTY TRANSACTIONS (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Related Party Transaction [Line Items]          
General and administrative expense $ 6,618,000 $ 6,385,000 $ 20,873,000 $ 25,503,000  
Management and development fees 375,000 551,000 1,356,000 1,779,000  
Affiliated Entity | Vornado          
Related Party Transaction [Line Items]          
General and administrative expense 400,000 400,000 1,300,000 1,500,000  
Affiliated Entity | Separation Transaction | Vornado          
Related Party Transaction [Line Items]          
Payables to related party 0   0    
Affiliated Entity | Management Agreement | Vornado          
Related Party Transaction [Line Items]          
Management and development fee income 400,000 600,000 1,400,000    
Affiliated Entity | Management Agreement | Vornado | Accounts Receivable          
Related Party Transaction [Line Items]          
Management fees receivable $ 300,000   $ 300,000   $ 700,000
Affiliated Entity | Management Agreement | Vornado | Interstate          
Related Party Transaction [Line Items]          
Noncontrolling interest percentage 7.10%   7.10%    
Affiliated Entity | Management Agreement | Alexander's, Inc. | Vornado          
Related Party Transaction [Line Items]          
Noncontrolling interest percentage 32.40%   32.40%    
Affiliated Entity | Transition Services | Vornado          
Related Party Transaction [Line Items]          
General and administrative expense $ 200,000 300,000 $ 600,000 1,200,000  
Affiliated Entity | Rent Expense | Vornado          
Related Party Transaction [Line Items]          
General and administrative expense $ 200,000 $ 100,000 $ 700,000 $ 300,000