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Commitments and Contingencies (Details) (USD $) | 1 Months Ended |
--- | --- | ---
Aug. 31, 2010 | Mar. 31, 2014 Property
Tax incremental financing obligation |  |
The amount of tax incremental financing bonds issued by Anne Arundel County, Maryland | $ 30,000,000 |
Liability recognized with regard to tax incremental financing obligation at end of current period |  | 1,900,000
Environmental Indemnity Agreement |  |
Number of lease properties which were provided environmental indemnifications |  | 3
Environmental indemnification to the tenant against losses covered under prior owner's indemnity agreement |  | 5,000,000
Maximum environmental indemnification to the tenant against consequential damages after acquisition of property |  | 12,500,000
Additional costs agreed to be paid by the entity related to construction and environmental regulatory activities (as a percent) |  | 50.00%
Maximum annual additional costs agreed to be paid by the entity related to construction and environmental regulatory activities |  | 300,000
Maximum additional costs agreed to be paid by the entity related to construction and environmental regulatory activities |  | 1,500,000
Nonrecourse loan guarantees of unconsolidated partnership |  |
Joint Ventures |  |
Maximum approximate amount required to be paid under the guarantees for outstanding debt, excluding interest and penalties |  | $ 5,600,000

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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X
- 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
Name: | ofc_AdditionalCostsIncurredRelatedToConstructionAndEnvironmentalRegulatoryActivitiesPercentage
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X
- 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
Name: | ofc_EnvironmentalIndemnificationToTenantAgainstConsequentialDamagesAfterAcquisitionOfPropertyMaximum
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Data Type: | xbrli:monetaryItemType
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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
Name: | ofc_EnvironmentalIndemnificationToTenantAgainstLossesCoveredUnderPriorOwnerIndemnityAgreementMaximum
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- Details
Name: | ofc_EnvironmentalIndemnityAgreementAbstract
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X
- Details
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X
- 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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Data Type: | xbrli:monetaryItemType
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Period Type: | instant

X
- Definition Represents the balance of nonrecourse mezzanine debt of unconsolidated real estate joint venture. + 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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X
- 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
Name: | ofc_TaxIncrementalFinancingBondsAmountIssuedByAnneArundelCountyMaryland
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- Details
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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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