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Information by Business Segment - Narrative (Details)	Mar. 31, 2022 Property
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