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Properties, net (Details 4) | 6 Months Ended
--- | ---
Jun. 30, 2012 sqft Property
Properties under construction |
Construction and Redevelopment Activities |
Number of real estate properties | 8
Square footage of real estate properties (in square feet) | 988,000
Properties under construction | Baltimore and Washington Corridor |
Construction and Redevelopment Activities |
Number of real estate properties | 4
Properties under construction | Greater Baltimore |
Construction and Redevelopment Activities |
Number of real estate properties | 1
Properties under construction | Northern Virginia |
Construction and Redevelopment Activities |
Number of real estate properties | 1
Properties under construction | Huntsville |
Construction and Redevelopment Activities |
Number of real estate properties | 2
Properties under redevelopment | Greater Philadelphia |
Construction and Redevelopment Activities |
Number of real estate properties | 1
Square footage of real estate properties (in square feet) | 113,000

X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_RealEstatePropertiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of square footage related to a real estate property. + References No definition available. + Details
Name: | us-gaap_SquareFootageOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration