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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

X

- 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

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

X

- Details

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