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Information by Business Segment - Narrative (Details) | Mar. 31, 2022 property
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Segment Reporting [Abstract] |
Number of properties changing reportable segments | 2

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- Definition Number of Properties Changing Reportable Segments + References No definition available. + Details
Name: | ofc_NumberOfPropertiesChangingReportableSegments
Namespace Prefix: | ofc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration