Quarterly report [Sections 13 or 15(d)]

Information by Business Segment - Reconciliation of UJV NOI Allocable to COPT Defense to Equity in Income (Loss) of Unconsolidated Entities (Details)

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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 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Segment financial information for real estate operations        
UJV NOI allocable to COPT Defense $ 2,212 $ 1,864 $ 6,318 $ 5,623
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 (1,797) (1,786) (4,105) (4,819)
Add: Equity in loss of unconsolidated non-real estate entities 0 1,737 0 1,737
Equity in income of unconsolidated entities 415 1,815 2,213 2,541
Reportable segments        
Segment financial information for real estate operations        
UJV NOI allocable to COPT Defense $ 2,212 $ 1,864 $ 6,318 $ 5,623