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 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures $ (1,268) $ (229) $ (2,060) $ (2,059)
Marbella RoseGarden, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures 3 (170) (13) (446)
RoseGarden Monaco, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (249) (416) (764) (1,238)
Rosewood Lafayette Holdings, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (221) (295) (639) (869)
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 (90) (152) (264) (393)
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 (217) 53 (155) 204
PruRose Riverwalk G, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (615) (198) (1,766) (576)
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   (87) (203) (255)
Crystal House Apartments Investors LLC [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures 68 (1,149) (206) (2,671)
Portside Master Company, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (228) (109) (661) (222)
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 (220) (181) (638) (459)
Roseland/Port Imperial Partners, L.P. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (173)   (518)  
RoseGarden Marbella South, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures   (20)   (57)
Estuary Urban Renewal Unit B, LLC [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures   (44) (15) (107)
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)  
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     (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 101 99 306 306
12 Vreeland Associates, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures 22 (25) 165 (1)
BNES Associates III [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures 127 (37) 273 (108)
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 (412)   (1,548)  
Keystone-TriState [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (733)   (733)  
KPG-MCG Curtis JV, LLC [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures 113   364  
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 74 24 220 52
Roseland/North Retail, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (34) (62) (81) (194)
South Pier At Harborside [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures 583 835 1,874 1,380
Stamford SM LLC [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures 493 1,023 2,337 2,805
Other [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures $ 340 $ 682 $ 876 $ 1,396