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Share-Based Compensation and Other Compensation Matters (Details 5) (Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member], Management, USD $) In Millions, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] | Management |  |
Deferred Compensation Plan |  |
Maximum percentage of participants' compensation which is deferrable (as a percent) | 100.00%ofc_DeferredCompensationArrangementWithIndividualMaximumDeferrablePercentageOfCompensation / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember / us-gaap_TitleOfIndividualAxis = us-gaap_ManagementMember |
Balance of the plan which was fully funded | $ 5.9 us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember / us-gaap_TitleOfIndividualAxis = us-gaap_ManagementMember | $ 7.5 us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember / us-gaap_TitleOfIndividualAxis = us-gaap_ManagementMember

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- Definition Represents the maximum percentage of participants' compensation that is deferrable by participants under the deferred compensation plan. + References No definition available. + Details
Name: | ofc_DeferredCompensationArrangementWithIndividualMaximumDeferrablePercentageOfCompensation
Namespace Prefix: | ofc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DeferredCompensationArrangementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant