XML 73 R42.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Organization (Details) | 9 Months Ended
--- | ---
Sep. 30, 2013 sqft acre
Operating office properties |
Investments in real estate |
Number of real estate properties | 210
Square footage of real estate properties (in square feet) | 19,200,000
Office propertiesunder, or contractually committed for, construction or approved for redevelopment |
Investments in real estate |
Number of real estate properties | 11
Square footage of real estate properties (in square feet) | 1,500,000
Office properties under construction or redevelopment which are partially operational |
Investments in real estate |
Number of real estate properties | 1
Land held or under pre-construction |
Investments in real estate |
Area of land held or under pre-construction (in acres) | 1,721
Area of land parcels controlled but not owned (in acres) | 56
Developable square footage of real estate properties (in square feet) | 20,400,000
Partially operational, wholesale data center |
Investments in real estate |
The expected stabilization critical load after completion of development (in megawatts) | 18

X
- Definition Represents the area of land parcels in acres. + References No definition available. + Details
Name: | ofc_AcresOfRealEstateProperty
Namespace Prefix: | ofc_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the area of land parcels held or under pre-construction that is controlled but not owned. + References No definition available. + Details
Name: | ofc_AcresOfRealEstatePropertyControlledButNotOwned
Namespace Prefix: | ofc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of square feet into which a land parcel is potentially developable. + References No definition available. + Details
Name: | ofc_DevelopableSquareFeet
Namespace Prefix: | ofc_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the expected stabilization critical load after completion of development of the property. Critical load is the amount of megawatts of power made available for the exclusive use tenants in the property. + References No definition available. + Details
Name: | ofc_ExpectedStabilizationCriticalLoad
Namespace Prefix: | ofc_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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