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v3.20.4

Construction Contract and Other Service Revenues (Deferred Incremental Costs Incurred) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Construction contract revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Deferred incremental costs incurred | $ 0 | $ 0 | $ 0

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- Definition Deferred Incremental Costs Incurred + References No definition available. + Details
Name: | ofc_DeferredIncrementalCostsIncurred
Namespace Prefix: | ofc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ProductOrServiceAxis=ofc_ConstructionContractRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |