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Fair Value Measurements - Narrative (Details) - Fair value measurement on a recurring basis - Deferred compensation plan - Trustees and Management - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Mar. 31, 2023
Assets and liabilities measured at fair value on a recurring basis
Maximum percentage of participants' compensation which is deferrable (as a percent)	100.00%
Marketable securities in deferred compensation plan		$ 1.9

X

- Definition

Represents the maximum percentage of participants' compensation that is deferrable by participants under the deferred compensation plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	ofc_
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Balance Type:	na
Period Type:	duration

X

- Definition

Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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- 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

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- Details

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- Details

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- Details

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