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Leases - Narrative (Details) $ in Millions	Oct. 22, 2021 USD ($)
Land
Lessee, Lease, Description [Line Items]
Carrying value of finance lease right of use asset acquired under bargain purchase option	$ 37.8

X

- Definition

Carrying value of Finance Lease Right of Use Asset Aquired Under Bargain Purchase Option

+ References

No definition available.

+ Details

Name:	ofc_CarryingValueOfFinanceLeaseRightOfUseAssetAcquiredUnderBargainPurchaseOption
Namespace Prefix:	ofc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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_LesseeLeaseDescriptionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: