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Commitments And Contingencies (Narrative) (Details) (USD $)
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3 Months Ended | 6 Months Ended | 16 Months Ended | 6 Months Ended | 9 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 6 Months Ended | |||||||||||||||||||||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
Harborside Residential Project [Member]
property
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Mar. 31, 2013
Harborside Residential Project [Member]
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Jun. 30, 2013
Harborside Residential Project [Member]
Parent Company [Member]
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Jun. 30, 2013
Wegmans Food Markets, Inc. [Member]
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Mar. 31, 2013
Wegmans Food Markets, Inc. [Member]
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Jul. 31, 2012
Wegmans Food Markets, Inc. [Member]
sqft
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Jun. 30, 2013
Minimum [Member]
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Jun. 30, 2013
Maximum [Member]
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Jun. 30, 2013
Harborside Financial Center Plaza 4-A [Member]
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Jun. 30, 2012
Harborside Financial Center Plaza 4-A [Member]
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Jun. 30, 2013
Harborside Financial Center Plaza 4-A [Member]
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Jun. 30, 2012
Harborside Financial Center Plaza 4-A [Member]
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Jun. 30, 2013
Harborside Financial Center Plaza 5 [Member]
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Jun. 30, 2012
Harborside Financial Center Plaza 5 [Member]
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Jun. 30, 2013
Harborside Financial Center Plaza 5 [Member]
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Jun. 30, 2012
Harborside Financial Center Plaza 5 [Member]
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Jun. 30, 2013
Property Lock-Ups [Member]
property
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Jun. 30, 2013
Property Lock-Ups Expired [Member]
property
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Jun. 30, 2013
Port Imperial 4/5 Garage Development [Member]
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Jun. 30, 2013
Weehawken, New Jersey [Member]
item
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Jun. 30, 2013
Weehawken, New Jersey [Member]
Land [Member]
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Apr. 30, 2013
Roseland Partners, L.L.C. [Member]
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Jun. 30, 2013
Roseland Partners, L.L.C. [Member]
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Jun. 30, 2013
Roseland Assets [Member]
Roseland Partners, L.L.C. [Member]
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Jun. 30, 2013
Completion Of Certain Developments [Member]
Roseland Partners, L.L.C. [Member]
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Jun. 30, 2013
Start Of Construction On Certain Developments [Member]
Roseland Partners, L.L.C. [Member]
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Jun. 30, 2013
Obtaining Of Tax Credits/Grants [Member]
Roseland Partners, L.L.C. [Member]
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Jun. 30, 2013
Total Return To Shareholders [Member]
Roseland Partners, L.L.C. [Member]
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Jun. 30, 2013
Failure To Achieve Certain Level Of Fee Revenue [Member]
Roseland Partners, L.L.C. [Member]
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| 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 | 495,000 | 495,000 | 854,000 | 854,000 | 1,700,000 | 1,700,000 | |||||||||||||||||||||||||
| Period of real estate taxes phase in | 5 years | ||||||||||||||||||||||||||||||||
| Ground lease expense incurred | 102,000 | 102,000 | 203,000 | 203,000 | |||||||||||||||||||||||||||||
| 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 | ||||||||||||||||||||||||||||||||
| Benefit related to change in fair value of Earn Out liability | 1,000,000 | ||||||||||||||||||||||||||||||||
| Earn out paid | 2,755,000 | ||||||||||||||||||||||||||||||||
| Contingent purchase price measurement period | 33 months | ||||||||||||||||||||||||||||||||
| Amount of cash deposited to escrow | 34,000,000 | ||||||||||||||||||||||||||||||||
| Amount of escrow released | 6,700,000 | ||||||||||||||||||||||||||||||||
| Discount on contingently returnable consideration | 0 | ||||||||||||||||||||||||||||||||
| Number of properties | 7 | 123 | |||||||||||||||||||||||||||||||
| Properties aggregate net book value | 125,700,000 | 1,600,000,000 | |||||||||||||||||||||||||||||||
| Expiration year | 2016 | ||||||||||||||||||||||||||||||||
| Delivery date to tenant | first quarter of 2016 | second quarter of 2014 | third quarter 2013 | ||||||||||||||||||||||||||||||
| Total estimated costs of the project | 252,000,000 | ||||||||||||||||||||||||||||||||
| Costs of the project incurred | 8,700,000 | 2,800,000 | |||||||||||||||||||||||||||||||
| Number of apartments | 763 | ||||||||||||||||||||||||||||||||
| Percentage of interest in venture | 85.00% | 7.50% | 80.00% | ||||||||||||||||||||||||||||||
| Ownership percentage of third party venture | 15.00% | ||||||||||||||||||||||||||||||||
| Capital credit receivable per square foot | 30 | ||||||||||||||||||||||||||||||||
| Aggregate capital credits | 20,300,000 | ||||||||||||||||||||||||||||||||
| Amount to fund | 47,000,000 | ||||||||||||||||||||||||||||||||
| Area of property (in square feet) | 140,000 | ||||||||||||||||||||||||||||||||
| Obligations following cancelation of project | 0 | ||||||||||||||||||||||||||||||||
| Number of stories | 5 | ||||||||||||||||||||||||||||||||
| Number of parking spaces | 850 | ||||||||||||||||||||||||||||||||
| Carrying value of project land | $ 71,100,000 | $ 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 June 30, 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. | ||||||||||||||||||||||||||||||||