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Intangible Assets on Real Estate Acquisitions (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | $ 188,467,000 us-gaap_FiniteLivedIntangibleAssetsGross | $ 192,592,000 us-gaap_FiniteLivedIntangibleAssetsGross |
Accumulated Amortization | 144,613,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | 133,334,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Net Carrying Amount | 43,854,000 us-gaap_IntangibleAssetsNetExcludingGoodwill | 59,258,000 us-gaap_IntangibleAssetsNetExcludingGoodwill |
Amortization of the intangible assets | 15,200,000 us-gaap_AmortizationOfIntangibleAssets | 16,200,000 us-gaap_AmortizationOfIntangibleAssets | 21,400,000 us-gaap_AmortizationOfIntangibleAssets
Weighted average amortization period of intangible assets | 10 years |  |
Estimated future amortization expense associated with the intangible asset categories for the next five years |  |  |
2015 | 9,300,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |
2016 | 8,400,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |
2017 | 6,200,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |
2018 | 3,800,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |
2019 | 3,400,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |
In-place lease value |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | 123,759,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_InPlaceLeaseValueMember | 125,504,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_InPlaceLeaseValueMember |
Accumulated Amortization | 101,040,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_InPlaceLeaseValueMember | 93,885,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_InPlaceLeaseValueMember |
Net Carrying Amount | 22,719,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_InPlaceLeaseValueMember | 31,619,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_InPlaceLeaseValueMember |
Weighted average amortization period of intangible assets | 6 years |  |
Tenant relationship value |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | 42,301,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 44,414,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Accumulated Amortization | 28,492,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 25,962,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Net Carrying Amount | 13,809,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 18,452,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Weighted average amortization period of intangible assets | 7 years |  |
Below-market cost arrangements |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | 12,415,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_BelowMarketCostArrangementsMember | 12,416,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_BelowMarketCostArrangementsMember |
Accumulated Amortization | 5,984,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_BelowMarketCostArrangementsMember | 5,136,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_BelowMarketCostArrangementsMember |
Net Carrying Amount | 6,431,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_BelowMarketCostArrangementsMember | 7,280,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_BelowMarketCostArrangementsMember |
Weighted average amortization period of intangible assets | 31 years |  |
Above-market leases |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | 8,659,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMarketAdjustmentMember | 8,925,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMarketAdjustmentMember |
Accumulated Amortization | 8,159,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMarketAdjustmentMember | 7,970,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMarketAdjustmentMember |
Net Carrying Amount | 500,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMarketAdjustmentMember | 955,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMarketAdjustmentMember |
Weighted average amortization period of intangible assets | 2 years |  |
Market concentration premium |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | 1,333,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_MarketConcentrationPremiumMember | 1,333,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_MarketConcentrationPremiumMember |
Accumulated Amortization | 938,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_MarketConcentrationPremiumMember | 381,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_MarketConcentrationPremiumMember |
Net Carrying Amount | $ 395,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_MarketConcentrationPremiumMember | $ 952,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ofc_MarketConcentrationPremiumMember |
Weighted average amortization period of intangible assets | 28 years |  |

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