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Information by Business Segment - Reconciliation of UJV NOI Allocable to COPT Defense to Equity in Income (Loss) of Unconsolidated Entities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment financial information for real estate operations
UJV NOI allocable to COPT Defense	$ 1,889	$ 1,740
Less: Income from UJV allocable to COPT Defense attributable to depreciation and amortization expense and interest expense	(1,518)	(1,671)
Equity in income of unconsolidated entities	371	69
Reportable segments
Segment financial information for real estate operations
UJV NOI allocable to COPT Defense	$ 1,889	$ 1,740

X

- Definition

Income (Loss) from Equity Method Investments Allocable to Depreciation, Amortization, Interest Expense And Gain (Loss) On Debt Extinguishment

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- Definition

Unconsolidated Joint Venture Net Operating Income Allocable to Parent

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- Definition

Amount of income (loss) for proportionate share of equity method investee's income (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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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.

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