Quarterly report pursuant to Section 13 or 15(d)

Investments In Unconsolidated Joint Ventures (Summary Of Company's Equity In Earnings (Loss) Of Unconsolidated Joint Ventures) (Details)

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Investments In Unconsolidated Joint Ventures (Summary Of Company's Equity In Earnings (Loss) Of Unconsolidated Joint Ventures) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures $ (1,235) $ (1,750)
Plaza VIII & IX Associates, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures 102 9
South Pier At Harborside [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures 398 (511)
Red Bank Corporate Plaza, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures 99 101
12 Vreeland Associates, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures 89 (92)
Stamford SM LLC [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures 916 885
Marbella RoseGarden, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (6) (111)
RoseGarden Monaco Holdings, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (277) (399)
Rosewood Lafayette Holdings, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (216) (290)
PruRose Port Imperial South 15, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures   (606)
Rosewood Morristown, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (98) (124)
Overlook Ridge JV, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (46)  
Overlook Ridge JV 2C/3B, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures 62 (73)
Roseland/North Retail, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (24) (49)
BNES Associates III [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures 36 (69)
Portside Master Company, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (213) (45)
PruRose Port Imperial South 13, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (206) (133)
Roseland/Port Imperial Partners, L.P. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (164)  
RoseGarden Marbella South, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures   (18)
PruRose Riverwalk G, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (538) (186)
Elmajo Urban Renewal Associates, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (112) (115)
Estuary Urban Renewal Unit B, LLC [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (15)  
Hillsborough 206 Holdings, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (5)  
Grand Jersey Waterfront Urban Renewal Associates, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (37)  
Crystal House Apartments Investors LLC [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (327) 13
KPG-P 100 IMW JV, LLC [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (653)  
Other [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures   $ 63