Quarterly report pursuant to Section 13 or 15(d)

Commitments And Contingencies (Narrative) (Details)

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Commitments And Contingencies (Narrative) (Details) (USD $)
3 Months Ended 12 Months Ended 3 Months Ended 16 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 20 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 3 Months Ended 20 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Mar. 31, 2013
Harborside Residential Project [Member]
property
Mar. 31, 2013
Harborside Residential Project [Member]
property
Mar. 31, 2013
Harborside Residential Project [Member]
Parent Company [Member]
Aug. 31, 2011
Wyndham [Member]
item
sqft
Mar. 31, 2013
Wyndham [Member]
Dec. 31, 2012
Wyndham [Member]
Mar. 31, 2013
Wyndham [Member]
Mar. 31, 2013
Wegmans Food Markets, Inc. [Member]
Mar. 31, 2013
Wegmans Food Markets, Inc. [Member]
Jul. 31, 2012
Wegmans Food Markets, Inc. [Member]
sqft
Mar. 31, 2013
Minimum [Member]
Mar. 31, 2013
Minimum [Member]
Wyndham [Member]
Mar. 31, 2013
Maximum [Member]
Mar. 31, 2013
Maximum [Member]
Wyndham [Member]
Mar. 31, 2013
Harborside Financial Center Plaza 4-A [Member]
Mar. 31, 2012
Harborside Financial Center Plaza 4-A [Member]
Mar. 31, 2013
Harborside Financial Center Plaza 5 [Member]
Mar. 31, 2012
Harborside Financial Center Plaza 5 [Member]
Mar. 31, 2013
Property Lock-Ups [Member]
property
Mar. 31, 2013
Property Lock-Ups Expired [Member]
property
Mar. 31, 2013
Land [Member]
Wyndham [Member]
Mar. 31, 2013
Port Imperial 4/5 Garage Development [Member]
Mar. 31, 2013
Weehawken, New Jersey [Member]
item
Mar. 31, 2013
Weehawken, New Jersey [Member]
Land [Member]
Mar. 31, 2013
Roseland Partners, L.L.C. [Member]
Mar. 31, 2013
Roseland Assets [Member]
Roseland Partners, L.L.C. [Member]
Mar. 31, 2013
Completion Of Certain Developments [Member]
Roseland Partners, L.L.C. [Member]
Mar. 31, 2013
Start Of Construction On Certain Developments [Member]
Roseland Partners, L.L.C. [Member]
Mar. 31, 2013
Obtaining Of Tax Credits/Grants [Member]
Roseland Partners, L.L.C. [Member]
Mar. 31, 2013
Total Return To Shareholders [Member]
Roseland Partners, L.L.C. [Member]
Mar. 31, 2013
Failure To Achieve Certain Level Of Fee Revenue [Member]
Roseland Partners, L.L.C. [Member]
Commitments And Contingencies [Line Items]                                                                    
Project period                                   20 years   20 years         5 years                  
Percentage of PILOT on project costs                                   2.00%   2.00%                            
Total project costs                     $ 15,700,000             $ 49,500,000   $ 170,900,000                            
Payments in lieu of property taxes (PILOT)                                   247,000 247,000 854,000,000,000 854,000,000,000                          
Period of real estate taxes phase in                                                 5 years                  
Ground lease expense incurred   102,000 102,000                                                              
Fair value of contingent consideration                                                       10,000,000 6,300,000       3,700,000  
Business acquisition, contingent cash payment                                                       15,600,000 8,600,000 2,800,000 2,800,000 3,000,000 7,000,000 2,000,000
Business acquisition, earn out period                                                               3 years 3 years  
Purchase accounting adjustments                                                       0            
Earn out paid 2,755,000                                                                  
Contingent purchase price measurement period                                                       33 months            
Amount of cash deposited to escrow                                                       34,000,000            
Discount on contingently returnable consideration                                                       0            
Number of properties                                           7 126                      
Properties aggregate net book value                                           126,600,000 1,700,000,000                      
Expiration year                                           2016                        
Area of property (in square feet)             203,506           140,000                                          
Lease term               15 years 3 months                                                    
Number of lease extension options             2                                                      
Lease extension term                             5 years   10 years                                  
Delivery date to tenant       first quarter of 2016         February 2013   second quarter of 2014                             second quarter 2013                
Total estimated costs of the project       252,000,000       51,700,000                                                    
Costs of the project incurred         7,400,000         43,400,000   1,900,000                       13,000,000                    
Number of apartments       763 763                                                          
Percentage of interest in venture       85.00% 85.00%                 7.50%   80.00%                                    
Ownership percentage of third party venture       15.00% 15.00%                                                          
Capital credit receivable per square foot       30                                                            
Aggregate capital credits       20,300,000 20,300,000                                                          
Amount to fund           47,000,000                                                        
Obligations following cancelation of project       0 0                                                          
Number of stories                                                   5                
Number of parking spaces                                                   850                
Carrying value of project land                                                   $ 70,300,000 $ 13,100,000              
Holding and distribution pattern under operating agreement       Pursuant to the Development Agreement, the Company and Ironstate shall co-develop the Harborside Residential Project with Ironstate responsible for obtaining all required development permits and approvals. Major decisions with respect to the Harborside Residential Project will require the consent of the Company and Ironstate. The Company and Ironstate will have 85 and 15 percent interests, respectively, in the Harborside Residential Project. The Company will receive capital credit of $30 per approved developable square foot for its land, aggregating to approximately $20.3 million at March 31, 2013. In addition to the capital credit it will receive for its land contribution, the Company currently expects that it will fund approximately $47 million of the development costs of the project.