Annual report pursuant to Section 13 and 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 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]                      
Company's equity in earnings (loss) of unconsolidated joint ventures $ (268) $ (229) $ (80) $ (1,750) $ (662) $ 2,418 $ 1,733 $ 600 $ (2,327) $ 4,089 $ 2,022
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                 99 30 68
South Pier At Harborside [Member]
                     
Schedule of Equity Method Investments [Line Items]                      
Company's equity in earnings (loss) of unconsolidated joint ventures                 2,519 2,368 1,495
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                 372 360 446
12 Vreeland Associates, L.L.C. [Member]
                     
Schedule of Equity Method Investments [Line Items]                      
Company's equity in earnings (loss) of unconsolidated joint ventures                 74 427 374
Boston-Downtown Crossing [Member]
                     
Schedule of Equity Method Investments [Line Items]                      
Company's equity in earnings (loss) of unconsolidated joint ventures                 644 (458) (448)
Gale Jefferson, L.L.C. [Member]
                     
Schedule of Equity Method Investments [Line Items]                      
Company's equity in earnings (loss) of unconsolidated joint ventures                 69 81 87
Stamford SM LLC [Member]
                     
Schedule of Equity Method Investments [Line Items]                      
Company's equity in earnings (loss) of unconsolidated joint ventures                 3,719 3,078  
Marbella RoseGarden, L.L.C. [Member]
                     
Schedule of Equity Method Investments [Line Items]                      
Company's equity in earnings (loss) of unconsolidated joint ventures                 (540) 13  
RoseGarden Monaco Holdings, L.L.C. [Member]
                     
Schedule of Equity Method Investments [Line Items]                      
Company's equity in earnings (loss) of unconsolidated joint ventures                 (1,560) (311)  
Rosewood Lafayette Holdings, L.L.C. [Member]
                     
Schedule of Equity Method Investments [Line Items]                      
Company's equity in earnings (loss) of unconsolidated joint ventures                 (1,131) (197)  
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) (533)  
Rosewood Morristown, L.L.C. [Member]
                     
Schedule of Equity Method Investments [Line Items]                      
Company's equity in earnings (loss) of unconsolidated joint ventures                 (509) (25)  
Overlook Ridge JV, L.L.C. [Member]
                     
Schedule of Equity Method Investments [Line Items]                      
Company's equity in earnings (loss) of unconsolidated joint ventures                 (212)    
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                 293 (11)  
Roseland/North Retail, L.L.C. [Member]
                     
Schedule of Equity Method Investments [Line Items]                      
Company's equity in earnings (loss) of unconsolidated joint ventures                 (230) (80)  
BNES Associates III [Member]
                     
Schedule of Equity Method Investments [Line Items]                      
Company's equity in earnings (loss) of unconsolidated joint ventures                 (14) (323)  
Portside Master Company, L.L.C. [Member]
                     
Schedule of Equity Method Investments [Line Items]                      
Company's equity in earnings (loss) of unconsolidated joint ventures                 (421) (5)  
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                 (664) (87)  
Roseland/Port Imperial Partners, L.P. [Member]
                     
Schedule of Equity Method Investments [Line Items]                      
Company's equity in earnings (loss) of unconsolidated joint ventures                 (740)    
RoseGarden Marbella South, L.L.C. [Member]
                     
Schedule of Equity Method Investments [Line Items]                      
Company's equity in earnings (loss) of unconsolidated joint ventures                 (57) (13)  
PruRose Riverwalk G, L.L.C. [Member]
                     
Schedule of Equity Method Investments [Line Items]                      
Company's equity in earnings (loss) of unconsolidated joint ventures                 (985) (142)  
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                 (345) (83)  
Estuary Urban Renewal Unit B, LLC [Member]
                     
Schedule of Equity Method Investments [Line Items]                      
Company's equity in earnings (loss) of unconsolidated joint ventures                 (157)    
Hillsborough 206 Holdings, L.L.C. [Member]
                     
Schedule of Equity Method Investments [Line Items]                      
Company's equity in earnings (loss) of unconsolidated joint ventures                 (35)    
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                 (77)    
Crystal House Apartments Investors LLC [Member]
                     
Schedule of Equity Method Investments [Line Items]                      
Company's equity in earnings (loss) of unconsolidated joint ventures                 (2,639)    
KPG-P 100 IMW JV, LLC [Member]
                     
Schedule of Equity Method Investments [Line Items]                      
Company's equity in earnings (loss) of unconsolidated joint ventures                 (913)    
Other [Member]
                     
Schedule of Equity Method Investments [Line Items]                      
Company's equity in earnings (loss) of unconsolidated joint ventures                 $ 1,719