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Share-Based Compensation and Other Compensation Matters Share-Based Compensation and Other Compensation Matters (Details 4) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Maximum percentage of compensation employees can contribute to the 401K plan | 90.00%ofc_DefinedContributionPlanMaximumPercentageOfEmployeesCompensationContributionTo401KPlan |  |
Minimum age of participants who are eligible to contribute an additional portion of their annual compensation | 50 years |  |
Employer matching contribution for the first 1% of the participants' eligible compensation (as a percent) | 100.00%ofc_DefinedContributionPlanEmployerMatchingContributionForFirstOnePercentContributionByParticipant |  |
Maximum percentage of participants' compensation eligible for 100% employer matching contribution (as a percent) | 1.00%ofc_DefinedContributionPlanMaximumPercentageOfParticipantCompensationEligibleFor100PercentEmployerMatchingContribution |  |
Employer matching contribution for the next 5% after first 1% of the participants' eligible compensation (as a percent) | 50.00%ofc_DefinedContributionPlanEmployerMatchingConributionToEmployeePercentageUpToFivePercentAfterFirstOnePercentContributionByParticipant |  |
Maximum percentage of participants' compensation eligible for 50% employer matching contribution (as a percent) | 5.00%ofc_DefinedContributionPlanPercentageOfParticipantCompensationMartchedFiftyPercentByEmployer |  |
Employer's aggregate matching contribution for the first 6% of the participants' eligible compensation (as a percent) | 3.50%ofc_DefinedContributionPlanAggregateEmployerMatchingContribution |  |
Maximum percentage of participants' compensation eligible for 3.5% aggregate employer matching contribution | 6.00%ofc_DefinedContributionPlanMaximumPercentageOfParticipantCompensationEligibleFor35PercentOfEmployerMatchingContribution |  |
Participants' vesting portion in employer matching contribution after one year of credited service (as a percent) | 50.00%ofc_DefinedContributionPlanVestingPercentageAfterOneYearOfCreditService |  |
Period of credited service after which participants are 50% vested in employer matching contribution | 1 year |  |
Participants' vesting portion in employer matching contribution after two years of credited service (as a percent) | 100.00%ofc_DefinedContributionPlanVestingPercentageAfterTwoYearsOfCreditedService |  |
Period of credited service after which participants are 100% vested in employer matching contribution | 2 years |  |
Matching contribution under the plan | $ 1.2 us-gaap_DefinedBenefitPlanContributionsByEmployer | $ 1.1 us-gaap_DefinedBenefitPlanContributionsByEmployer | $ 1.1 us-gaap_DefinedBenefitPlanContributionsByEmployer

X
- Definition Represents the maximum percentage that the employer may contribute in matching contributions to a defined contribution plan on the first six percent of compensation contributions by an employee, under the terms of the plan. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the percentage of the employer matching contribution to the participant's next five percent of compensation contribution, after first one percent of contribution. + References No definition available. + Details
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Namespace Prefix: | ofc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of the employer's matching contribution to the first one percent of pre-tax and/or after-tax contribution that participants contribute to the defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | ofc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the maximum percentage of compensation employees are permitted to contribute to the entity's 401K plan. + References No definition available. + Details
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Namespace Prefix: | ofc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the maximum percentage of participants' compensation eligible for one hundred percent employer matching contribution. + References No definition available. + Details
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Data Type: | num:percentItemType
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Period Type: | duration

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- Definition Represents the maximum percentage of participants' compensation eligible for 3.5 percent employer matching contribution. + References No definition available. + Details
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Data Type: | num:percentItemType
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Period Type: | duration

X
- Definition Represents the minimum age of participants, who are eligible to contribute an additional portion of their annual compensation on a before-tax basis as catch-up contributions, up to the annual limit under the Internal Revenue Code of 1986. + References No definition available. + Details
Name: | ofc_DefinedContributionPlanMinimumParticipantsAgeForAdditionalContribution
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the maximum percentage of participants' compensation eligible for fifty percent employer matching contribution. + References No definition available. + Details
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Namespace Prefix: | ofc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the extent to which the participants are vested represented in percentage, in employer matching contribution after one year of credited service. + References No definition available. + Details
Name: | ofc_DefinedContributionPlanVestingPercentageAfterOneYearOfCreditService
Namespace Prefix: | ofc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the extent to which the participants are vested, represented in percentage, in employer matching contribution after two years of credited service. + References No definition available. + Details
Name: | ofc_DefinedContributionPlanVestingPercentageAfterTwoYearsOfCreditedService
Namespace Prefix: | ofc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the period of credited service after which participants are fifty percent vested in employer matching contribution. + References No definition available. + Details
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Namespace Prefix: | ofc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the period of credited service after which participants are hundred percent vested in employer matching contribution. + References No definition available. + Details
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Namespace Prefix: | ofc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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