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Fair Value Measurements (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2011
KEYW Holding Corporation |  |  |  |
Warrants |  |  |  |
Number of warrants owned (in shares) |  | 50,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ofc_KeywHoldingCorporationMember | 50,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ofc_KeywHoldingCorporationMember |
Exercise price of warrants (in dollars per share) |  | 9.25 ofc_ClassOfWarrantsExercisePriceOfWarrants / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ofc_KeywHoldingCorporationMember | 9.25 ofc_ClassOfWarrantsExercisePriceOfWarrants / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ofc_KeywHoldingCorporationMember |
Number of shares owned in investee (in shares) |  |  |  | 1,900,000 us-gaap_InvestmentOwnedBalanceShares / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ofc_KeywHoldingCorporationMember
Percentage of common stock owned |  |  |  | 7.00%ofc_TradingSecurityOwnershipPercentage / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ofc_KeywHoldingCorporationMember
Amount of sale of owned shares | $ 14.0 ofc_TradingSecurityInvestmentSaleValueofShares / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ofc_KeywHoldingCorporationMember |  |  |
Revenue earned from investee | $ 2.4 us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ofc_KeywHoldingCorporationMember |  |  |
Redeemable non-controlling interest | Fair value measurement on a recurring basis | Significant Unobservable Inputs (Level 3) |  |  |  |
Warrants |  |  |  |
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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