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Commitments and Contingencies (Details) (USD $) | 1 Months Ended | 0 Months Ended |
--- | --- | --- | ---
Aug. 31, 2010 | Apr. 15, 2015 | Mar. 31, 2015 Property
Tax incremental financing obligation |  |  |
The amount of tax incremental financing bonds issued by Anne Arundel County, Maryland | $ 30,000,000 ofc_TaxIncrementalFinancingBondsAmountIssuedByAnneArundelCountyMaryland |  |
Liability recognized with regard to tax incremental financing obligation at end of current period |  |  | 1,400,000 us-gaap_GuaranteeObligationsCurrentCarryingValue
Environmental Indemnity Agreement |  |  |
Number of lease properties which were provided environmental indemnifications |  |  | 3 ofc_PropertySubjectToEnvironmentalIndemnityLeaseAgreementNumberOfProperties
Environmental indemnification to the tenant against losses covered under prior owner's indemnity agreement |  |  | 5,000,000.0 ofc_EnvironmentalIndemnificationToTenantAgainstLossesCoveredUnderPriorOwnerIndemnityAgreementMaximum
Maximum environmental indemnification to the tenant against consequential damages after acquisition of property |  |  | 12,500,000.0 ofc_EnvironmentalIndemnificationToTenantAgainstConsequentialDamagesAfterAcquisitionOfPropertyMaximum
Additional costs agreed to be paid by the entity related to construction and environmental regulatory activities (as a percent) |  |  | 50.00%ofc_AdditionalCostsIncurredRelatedToConstructionAndEnvironmentalRegulatoryActivitiesPercentage
Maximum annual additional costs agreed to be paid by the entity related to construction and environmental regulatory activities |  |  | 300,000 ofc_AdditionalCostsIncurredRelatedToConstructionAndEnvironmentalRegulatoryActivitiesMaximumPerAnnum
Maximum additional costs agreed to be paid by the entity related to construction and environmental regulatory activities |  |  | 1,500,000.0 ofc_MaximumAdditionalCostsIncurredRelatedToConstructionAndEnvironmentalRegulatoryActivities
Subsequent Event | 2600 Park Tower Drive | Virginia |  |  |
Other Commitments [Line Items] |  |  |
Square footage of real estate properties (in square feet) |  | 240,000 us-gaap_AreaOfRealEstateProperty / us-gaap_BusinessAcquisitionAxis = ofc_A2600ParkTowerDriveMember / us-gaap_StatementGeographicalAxis = stpr_VA / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Acquired property percentage leased |  | 100.00%ofc_AcquiredPropertyPercentageLeased / us-gaap_BusinessAcquisitionAxis = ofc_A2600ParkTowerDriveMember / us-gaap_StatementGeographicalAxis = stpr_VA / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Total acquisition cost |  | $ 83,000,000 us-gaap_PaymentsToAcquireRealEstate / us-gaap_BusinessAcquisitionAxis = ofc_A2600ParkTowerDriveMember / us-gaap_StatementGeographicalAxis = stpr_VA / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |

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- Definition The percentage of acquired property that is leased at the time of acquisition, expressed as a percent. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the maximum annual additional costs agreed to be paid by the entity related to the construction and environmental regulatory activities incurred by the tenant as a result of the indemnified environmental condition of the properties. + References No definition available. + Details
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Period Type: | instant

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- Definition Represents the percentage of additional costs agreed to be paid by the entity related to the construction and environmental regulatory activities incurred by the tenant as a result of the indemnified environmental condition of the properties, subject to an annual and aggregate limits. + References No definition available. + Details
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- Definition Represents the maximum amount of environmental indemnification to the tenant against consequential damages after the acquisition of the property from the entity. + References No definition available. + Details
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Namespace Prefix: | ofc_
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X
- Definition Represents the maximum amount of environmental indemnification to the tenant against losses covered under an indemnity agreement of the prior owner of the property after the State of New Jersey declares the remediation complete. + References No definition available. + Details
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- Details
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- Definition Represents the maximum additional costs agreed to be paid by the entity related to the construction and environmental regulatory activities incurred by the tenant as a result of the indemnified environmental condition of the properties. + References No definition available. + Details
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- Definition Represents the number of lease properties in New Jersey which were provided environmental indemnifications by the entity. + References No definition available. + Details
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- Definition The bond amounts issued by Anne Arundel County, Maryland to third-party investors in order to finance public improvements needed in connection with National Business Park North. + References No definition available. + Details
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- Details
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- Definition Area of a real estate property. + References No definition available. + Details
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Balance Type: | na
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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Details
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- Definition The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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