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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Related Party Transaction [Line Items]          
General and administrative expense $ 6,930 $ 6,618 $ 22,720 $ 20,873  
Income from acquired leasehold interest 0 0 39,215 0  
Income from acquired leasehold interest 369 375 1,199 1,356  
Affiliated Entity | Vornado          
Related Party Transaction [Line Items]          
General and administrative expense $ 300 400 $ 1,200 1,300  
Affiliated Entity | Management Agreement | Vornado | Accounts Receivable          
Related Party Transaction [Line Items]          
Management fees receivable         $ 300
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 $ 100 200 $ 500 600  
Affiliated Entity | Rent Expense | Vornado          
Related Party Transaction [Line Items]          
General and administrative expense $ 200 $ 200 $ 700 $ 700