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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures $ 443 $ (80) $ (792) $ (1,830)
Marbella RoseGarden, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (9) (165) (15) (276)
RoseGarden Monaco, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (238) (423) (515) (822)
Rosewood Lafayette Holdings, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (203) (284) (419) (574)
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 (76) (117) (174) (241)
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   224 62 151
PruRose Riverwalk G, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (613) (192) (1,151) (378)
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 (91) (82) (203) (168)
Crystal House Apartments Investors LLC [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures 53 (1,535) (274) (1,522)
Portside Master Company, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (220) (68) (434) (113)
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 (213) (145) (418) (278)
Roseland/Port Imperial Partners, L.P. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (180)   (345)  
RoseGarden Marbella South, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures   (19)   (37)
Estuary Urban Renewal Unit B, LLC [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures   (34) (15) (63)
Harborside Unit A Urban Renewal, LLC [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (212) [1]   (212) [1]  
Overlook Ridge, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (213)   (259)  
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 (16)   (54)  
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 106 106 205 207
12 Vreeland Associates, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures 54 116 144 24
BNES Associates III [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures 110 (2) 147 (71)
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)  
KPG-P 100 IMW JV, LLC [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (483)   (1,136)  
KPG-MCG Curtis JV, LLC [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures 251 [2]   251 [2]  
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 44 19 146 28
Roseland/North Retail, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (23) (83) (47) (132)
South Pier At Harborside [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures 892 1,056 1,290 545
Stamford SM LLC [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures 928 897 1,844 1,782
Other [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures $ 795 $ 651 $ 795 $ 714
[1] See discussion in Recent Transactions following in this footnote.
[2] Includes undivided interests in the same manner as investments in noncontrolled partnership, pursuant to ASC 970-323-25-12. See discussion in Recent Transactions following in this footnote.