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Organization (Details)
 12 Months Ended
Dec. 31, 2014
acre
sqft
Operating office properties  
Investments in real estate  
Number of real estate properties 173us-gaap_NumberOfRealEstateProperties
/ ofc_RealEstatePropertiesStatusAxis
= ofc_OperatingOfficePropertiesMember
Square footage of real estate properties (in square feet) 16,800,000us-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 13us-gaap_NumberOfRealEstateProperties
/ ofc_RealEstatePropertiesStatusAxis
= ofc_OfficePropertiesUnderConstructionRedevelopmentOrContractuallyCommittedForConstructionMember
Square footage of real estate properties (in square feet) 1,600,000us-gaap_AreaOfRealEstateProperty
/ ofc_RealEstatePropertiesStatusAxis
= ofc_OfficePropertiesUnderConstructionRedevelopmentOrContractuallyCommittedForConstructionMember
Land Controlled for Future Development [Member]  
Investments in real estate  
Area of land we control (in acres) 1,464ofc_AcresOfRealEstateProperty
/ ofc_RealEstatePropertiesStatusAxis
= ofc_LandControlledforFutureDevelopmentMember
Developable square footage of real estate properties (in square feet) 18,300,000ofc_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
Debt in Default of Payment Terms  
Investments in real estate  
Number of real estate properties 2us-gaap_NumberOfRealEstateProperties
/ us-gaap_DebtInstrumentAxis
= ofc_DebtinDefaultofPaymentTermsMember