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v2.4.1.9

Properties, net (Details 2) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Properties |  |
Projects in development or held for future development | $ 489,618 us-gaap_DevelopmentInProcess | $ 545,426 us-gaap_DevelopmentInProcess
Assets held for sale, net | 0 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation | 14,339 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
Greater Baltimore |  |
Properties |  |
Number of properties held-for-sale |  | 2 ofc_NumberofRealEstatePropertiesAssetsHeldforsale / ofc_RealEstatePropertyDisposalAxis = ofc_GreaterBaltimoreMember
Assets held for sale, net |  | 14,300 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation / ofc_RealEstatePropertyDisposalAxis = ofc_GreaterBaltimoreMember
Projects in development or held for future development | Land in development or held for future development |  |
Properties |  |
Projects in development or held for future development | 219,852 us-gaap_DevelopmentInProcess / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ofc_LandInDevelopmentOrHeldForFutureDevelopmentMember / ofc_RealEstatePropertiesStatusAxis = ofc_ProjectsInDevelopmentOrHeldForFutureDevelopmentMember | 214,977 us-gaap_DevelopmentInProcess / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ofc_LandInDevelopmentOrHeldForFutureDevelopmentMember / ofc_RealEstatePropertiesStatusAxis = ofc_ProjectsInDevelopmentOrHeldForFutureDevelopmentMember
Projects in development or held for future development | Construction in progress, excluding land |  |
Properties |  |
Projects in development or held for future development | $ 269,766 us-gaap_DevelopmentInProcess / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember / ofc_RealEstatePropertiesStatusAxis = ofc_ProjectsInDevelopmentOrHeldForFutureDevelopmentMember | $ 330,449 us-gaap_DevelopmentInProcess / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember / ofc_RealEstatePropertiesStatusAxis = ofc_ProjectsInDevelopmentOrHeldForFutureDevelopmentMember

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- Definition Number of Real Estate Properties, Assets Held-for-sale + References No definition available. + Details
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Namespace Prefix: | ofc_
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- Definition Amount classified as assets attributable to disposal group held for sale or disposed of. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 + Details
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Period Type: | instant

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- Definition The current amount of expenditures for a real estate project that has not yet been completed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Details
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- Details
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Balance Type: |
Period Type: |