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Fair Value Measurements (Details 3) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Fair value of impaired properties and other assets |  |  |
Impairment losses | $ 1,416,000 us-gaap_AssetImpairmentCharges | $ 5,857,000 us-gaap_AssetImpairmentCharges | $ 43,678,000 us-gaap_AssetImpairmentCharges
Exit costs included in impairment losses in connection with dispositions | 0 ofc_PaymentsOfExitCostsIncludedInImpairmentLossesInConnectionWithDispositions | 979,000 ofc_PaymentsOfExitCostsIncludedInImpairmentLossesInConnectionWithDispositions | 4,146,000 ofc_PaymentsOfExitCostsIncludedInImpairmentLossesInConnectionWithDispositions
Fair value measurement on a recurring basis |  |  |
Fair value of impaired properties and other assets |  |  |
Assets | 6,320,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 14,660,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |
Fair value measurement on a nonrecurring basis | Projects in development or held for future development |  |  |
Fair value of impaired properties and other assets |  |  |
Impairment losses |  |  | 1,900,000 us-gaap_AssetImpairmentCharges / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / ofc_RealEstatePropertiesStatusAxis = ofc_ProjectsInDevelopmentOrHeldForFutureDevelopmentMember
Fair value measurement on a nonrecurring basis | Property Conveyances |  |  |
Fair value of impaired properties and other assets |  |  |
Impairment losses |  | 11,000,000 us-gaap_AssetImpairmentCharges / ofc_AssetsbyTypeAxis = ofc_PropertyConveyancesMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |
Exit costs included in impairment losses in connection with dispositions |  | 560,000 ofc_PaymentsOfExitCostsIncludedInImpairmentLossesInConnectionWithDispositions / ofc_AssetsbyTypeAxis = ofc_PropertyConveyancesMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |
Fair value measurement on a nonrecurring basis | Other Properties with Shortened Holding Periods |  |  |
Fair value of impaired properties and other assets |  |  |
Number of properties, shortened holding period |  | 2 ofc_NumberofPropertiesShortenedHoldingPeriod / ofc_AssetsbyTypeAxis = ofc_OtherPropertieswithShortenedHoldingPeriodsMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |
Fair value measurement on a nonrecurring basis | Strategic Reallocation Plan |  |  |
Fair value of impaired properties and other assets |  |  |
Impairment losses |  |  | 19,000,000 us-gaap_AssetImpairmentCharges / ofc_AssetsbyTypeAxis = ofc_StrategicReallocationPlanMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Exit costs included in impairment losses in connection with dispositions |  | 419,000 ofc_PaymentsOfExitCostsIncludedInImpairmentLossesInConnectionWithDispositions / ofc_AssetsbyTypeAxis = ofc_StrategicReallocationPlanMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |
Fair value measurement on a nonrecurring basis | Properties, Net |  |  |
Fair value of impaired properties and other assets |  |  |
Impairment losses |  | 31,068,000 us-gaap_AssetImpairmentCharges / ofc_AssetsbyTypeAxis = ofc_RealEstateInvestmentPropertiesNetMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |
Assets |  | 4,459,000 us-gaap_AssetsFairValueDisclosure / ofc_AssetsbyTypeAxis = ofc_RealEstateInvestmentPropertiesNetMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |
Fair value measurement on a nonrecurring basis | Additional Property Disposed [Member] |  |  |
Fair value of impaired properties and other assets |  |  |
Impairment losses |  |  | 5,100,000 us-gaap_AssetImpairmentCharges / ofc_AssetsbyTypeAxis = ofc_AdditionalPropertyDisposedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Fair value measurement on a nonrecurring basis | Significant Unobservable Inputs (Level 3) | Strategic Reallocation Plan |  |  |
Fair value of impaired properties and other assets |  |  |
Exit costs included in impairment losses in connection with dispositions |  |  | 4,200,000 ofc_PaymentsOfExitCostsIncludedInImpairmentLossesInConnectionWithDispositions / ofc_AssetsbyTypeAxis = ofc_StrategicReallocationPlanMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Fair value measurement on a nonrecurring basis | Significant Unobservable Inputs (Level 3) | Properties, Net |  |  |
Fair value of impaired properties and other assets |  |  |
Exit costs included in impairment losses in connection with dispositions |  | 979,000 ofc_PaymentsOfExitCostsIncludedInImpairmentLossesInConnectionWithDispositions / ofc_AssetsbyTypeAxis = ofc_RealEstateInvestmentPropertiesNetMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |
Assets |  | 4,459,000 us-gaap_AssetsFairValueDisclosure / ofc_AssetsbyTypeAxis = ofc_RealEstateInvestmentPropertiesNetMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |
Fair value measurement on a nonrecurring basis | Discounted Cash Flow |  |  |
Fair value of impaired properties and other assets |  |  |
Discount rate |  | 10.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_ValuationTechniqueAxis = ofc_DiscountedCashFlowValuationTechniqueMember |
Terminal capitalization rate |  | 9.50%ofc_FairValueInputsTerminalCapitalizationRate / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_ValuationTechniqueAxis = ofc_DiscountedCashFlowValuationTechniqueMember |
Market rent growth rate |  | 3.00%ofc_FairValueInputsMarketRentGrowthRate / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_ValuationTechniqueAxis = ofc_DiscountedCashFlowValuationTechniqueMember |
Expense growth rate |  | 3.00%ofc_FairValueInputsExpenseGrowthRate / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_ValuationTechniqueAxis = ofc_DiscountedCashFlowValuationTechniqueMember |
Fair value measurement on a nonrecurring basis | Discounted Cash Flow | Significant Unobservable Inputs (Level 3) | Properties, Net |  |  |
Fair value of impaired properties and other assets |  |  |
Assets |  | 4,459,000 us-gaap_AssetsFairValueDisclosure / ofc_AssetsbyTypeAxis = ofc_RealEstateInvestmentPropertiesNetMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_ValuationTechniqueAxis = ofc_DiscountedCashFlowValuationTechniqueMember |
Fair value measurement on a nonrecurring basis | Discontinued Operations | Strategic Reallocation Plan |  |  |
Fair value of impaired properties and other assets |  |  |
Impairment losses |  | 15,200,000 us-gaap_AssetImpairmentCharges / ofc_AssetsbyTypeAxis = ofc_StrategicReallocationPlanMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember | 23,200,000 us-gaap_AssetImpairmentCharges / ofc_AssetsbyTypeAxis = ofc_StrategicReallocationPlanMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Fair value measurement on a nonrecurring basis | Greater Baltimore | Other Properties with Shortened Holding Periods |  |  |
Fair value of impaired properties and other assets |  |  |
Impairment losses | 1,371,000 us-gaap_AssetImpairmentCharges / ofc_AssetsbyTypeAxis = ofc_OtherPropertieswithShortenedHoldingPeriodsMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / invest_InvestmentGeographicRegionAxis = ofc_GreaterBaltimoreMember | 5,900,000 us-gaap_AssetImpairmentCharges / ofc_AssetsbyTypeAxis = ofc_OtherPropertieswithShortenedHoldingPeriodsMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / invest_InvestmentGeographicRegionAxis = ofc_GreaterBaltimoreMember |
Fair value measurement on a nonrecurring basis | Greater Philadelphia |  |  |
Fair value of impaired properties and other assets |  |  |
Impairment losses |  |  | 46,100,000 us-gaap_AssetImpairmentCharges / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / invest_InvestmentGeographicRegionAxis = ofc_GreaterPhiladelphiaMember
Future expenditures for redevelopment |  |  | 25,000,000 ofc_FutureExpenditureRedevelopment / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / invest_InvestmentGeographicRegionAxis = ofc_GreaterPhiladelphiaMember
Fair value measurement on a nonrecurring basis | Colorado Springs | Strategic Reallocation Plan |  |  |
Fair value of impaired properties and other assets |  |  |
Impairment losses |  |  | $ 6,900,000 us-gaap_AssetImpairmentCharges / ofc_AssetsbyTypeAxis = ofc_StrategicReallocationPlanMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / invest_InvestmentGeographicRegionAxis = ofc_ColoradoSpringsMember
Redeemable non-controlling interest | Fair value measurement on a recurring basis | Significant Unobservable Inputs (Level 3) |  |  |
Fair value of impaired properties and other assets |  |  |
Discount rate | 15.50%us-gaap_FairValueInputsDiscountRate / us-gaap_BalanceSheetLocationAxis = ofc_RedeemableNonControllingInterestMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 15.50%us-gaap_FairValueInputsDiscountRate / us-gaap_BalanceSheetLocationAxis = ofc_RedeemableNonControllingInterestMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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