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RELATED PARTY TRANSACTIONS (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Related Party Transaction [Line Items]      
General and administrative expense $ 6,720,000 $ 12,326,000  
Affiliated Entity | Vornado      
Related Party Transaction [Line Items]      
General and administrative expense 400,000 600,000  
Affiliated Entity | Separation Transaction | Vornado      
Related Party Transaction [Line Items]      
Payables to related party 0    
Affiliated Entity | Management Agreement | Vornado      
Related Party Transaction [Line Items]      
Management and development fee income 500,000    
Affiliated Entity | Management Agreement | Vornado | Accounts Receivable      
Related Party Transaction [Line Items]      
Management fees receivable $ 300,000   $ 700,000
Affiliated Entity | Management Agreement | Vornado | Interstate      
Related Party Transaction [Line Items]      
Noncontrolling interest percentage 7.10%    
Affiliated Entity | Management Agreement | Alexander's, Inc. | Vornado      
Related Party Transaction [Line Items]      
Noncontrolling interest percentage 32.40%    
Affiliated Entity | Transition Services | Vornado      
Related Party Transaction [Line Items]      
General and administrative expense $ 200,000 500,000  
Affiliated Entity | Rent Expense | Vornado      
Related Party Transaction [Line Items]      
General and administrative expense $ 200,000 $ 100,000