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v2.3.0.11

Organization (Details) | 6 Months Ended
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Jun. 30, 2011
Wholly owned operating office properties |
Investments in real estate |
Number of real estate properties | 249
Square footage of real estate properties (in square feet) | 20,200,000
Wholly owned office properties under construction, development or redevelopment |
Investments in real estate |
Number of real estate properties | 17
Square footage of real estate properties (in square feet) | 2,200,000
Wholly owned properties under construction, development or redevelopment which are partially operational. |
Investments in real estate |
Number of real estate properties | 2
Wholly owned land parcels |
Investments in real estate |
Developable square footage of real estate properties (in square feet) | 13,000,000
Acres of real estate property (in acres) | 1,516
Wholly owned, partially operational, wholesale data center |
Investments in real estate |
Expected initial stabilization critical load (in megawatts) | 18

X
- Definition Represents the area of wholly owned land parcels in acres. + Details
Name: | ofc_AcresOfRealEstateProperty
Namespace Prefix: | ofc
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of square feet into which a land parcel is potentially developable. + Details
Name: | ofc_DevelopableSquareFeet
Namespace Prefix: | ofc
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents expected megawatts of critical load handled by the data center upon initial stabilization. + Details
Name: | ofc_ExpectedInitialStabilizationCriticalLoadMegawatts
Namespace Prefix: | ofc
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of real estate properties owned as of the balance sheet date. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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. + Details
Name: | us-gaap_SquareFootageOfRealEstateProperty
Namespace Prefix: | us-gaap
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration