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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, 2026 | Mar. 31, 2025
Segment financial information for real estate operations |  |
UJV NOI allocable to COPT Defense | $ 2,056 | $ 1,889
Less: Income from UJV allocable to COPT Defense attributable to depreciation and amortization expense, interest expense, gain on sale of real estate, and loss on early extinguishment of debt | (650) | (1,518)
Equity in income of unconsolidated entities | 1,406 | 371
Reportable segments |  |
Segment financial information for real estate operations |  |
UJV NOI allocable to COPT Defense | $ 2,056 | $ 1,889

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