XML 49 R40.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Organization (Details) | Mar. 31, 2015 Property
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Debt in default of payment terms | Northern Virginia | Wholly owned subsidiary |
Investments in real estate |
Number of real estate properties | 2 us-gaap_NumberOfRealEstateProperties / us-gaap_DebtInstrumentAxis = ofc_DebtinDefaultofPaymentTermsMember / dei_LegalEntityAxis = ofc_WhollyOwnedSubsidiaryMember / us-gaap_StatementGeographicalAxis = ofc_NorthernVirginiaMember
Operating office properties |
Investments in real estate |
Number of real estate properties | 178 us-gaap_NumberOfRealEstateProperties / ofc_RealEstatePropertiesStatusAxis = ofc_OperatingOfficePropertiesMember
Square footage of real estate properties (in square feet) | 17,700,000 us-gaap_AreaOfRealEstateProperty / ofc_RealEstatePropertiesStatusAxis = ofc_OperatingOfficePropertiesMember
Office properties under, or contractually committed for, construction or approved for redevelopment |
Investments in real estate |
Number of real estate properties | 12 us-gaap_NumberOfRealEstateProperties / ofc_RealEstatePropertiesStatusAxis = ofc_OfficePropertiesUnderConstructionRedevelopmentOrContractuallyCommittedForConstructionMember
Square footage of real estate properties (in square feet) | 1,400,000 us-gaap_AreaOfRealEstateProperty / ofc_RealEstatePropertiesStatusAxis = ofc_OfficePropertiesUnderConstructionRedevelopmentOrContractuallyCommittedForConstructionMember
Partially operational properties |
Investments in real estate |
Number of real estate properties | 1 us-gaap_NumberOfRealEstateProperties / ofc_RealEstatePropertiesStatusAxis = ofc_PartiallyOperationalPropertiesMember
Land controlled for future development |
Investments in real estate |
Square footage of real estate properties (in square feet) | 1,402 us-gaap_AreaOfRealEstateProperty / ofc_RealEstatePropertiesStatusAxis = ofc_LandControlledforFutureDevelopmentMember
Developable square feet | 17,600,000 ofc_DevelopableSquareFeet / ofc_RealEstatePropertiesStatusAxis = ofc_LandControlledforFutureDevelopmentMember
Partially operational, wholesale data center |
Investments in real estate |
The expected stabilization critical load after completion of development (in megawatts) | 19.25 ofc_ExpectedStabilizationCriticalLoad / ofc_RealEstatePropertiesStatusAxis = ofc_PartiallyOperationalWholesaleDataCenterMember

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- 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: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- 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

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- 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

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

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- Details
Name: | ofc_RealEstatePropertiesStatusAxis=ofc_LandControlledforFutureDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | ofc_RealEstatePropertiesStatusAxis=ofc_OfficePropertiesUnderConstructionRedevelopmentOrContractuallyCommittedForConstructionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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X
- Details
Name: | ofc_RealEstatePropertiesStatusAxis=ofc_OperatingOfficePropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ofc_RealEstatePropertiesStatusAxis=ofc_PartiallyOperationalPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ofc_RealEstatePropertiesStatusAxis=ofc_PartiallyOperationalWholesaleDataCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=ofc_DebtinDefaultofPaymentTermsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |