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Organization (Details)
Mar. 31, 2015
Property
Debt in default of payment terms | Northern Virginia | Wholly owned subsidiary  
Investments in real estate  
Number of real estate properties 2us-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 178us-gaap_NumberOfRealEstateProperties
/ ofc_RealEstatePropertiesStatusAxis
= ofc_OperatingOfficePropertiesMember
Square footage of real estate properties (in square feet) 17,700,000us-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 12us-gaap_NumberOfRealEstateProperties
/ ofc_RealEstatePropertiesStatusAxis
= ofc_OfficePropertiesUnderConstructionRedevelopmentOrContractuallyCommittedForConstructionMember
Square footage of real estate properties (in square feet) 1,400,000us-gaap_AreaOfRealEstateProperty
/ ofc_RealEstatePropertiesStatusAxis
= ofc_OfficePropertiesUnderConstructionRedevelopmentOrContractuallyCommittedForConstructionMember
Partially operational properties  
Investments in real estate  
Number of real estate properties 1us-gaap_NumberOfRealEstateProperties
/ ofc_RealEstatePropertiesStatusAxis
= ofc_PartiallyOperationalPropertiesMember
Land controlled for future development  
Investments in real estate  
Square footage of real estate properties (in square feet) 1,402us-gaap_AreaOfRealEstateProperty
/ ofc_RealEstatePropertiesStatusAxis
= ofc_LandControlledforFutureDevelopmentMember
Developable square feet 17,600,000ofc_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) 19.25ofc_ExpectedStabilizationCriticalLoad
/ ofc_RealEstatePropertiesStatusAxis
= ofc_PartiallyOperationalWholesaleDataCenterMember