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Leases - Lessee Arrangements (Details) $ in Millions | Jun. 30, 2021 USD ($)
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Leases [Abstract] |
Lessee right-of-use asset | $ 79.4

X
- Definition Amount of lessee's right to use underlying asset under operating and finance leases. + References No definition available. + Details
Name: | ofc_LesseeRightofUseAsset
Namespace Prefix: | ofc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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