Dispositions and Real Estate Held for Sale - Schedule of Long-Lived Asset Held for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Real estate and other assets held for sale, net
Deferred leasing costs and acquisition-related intangible assets, net	$ 278,232	$ 225,937
Liabilities related to real estate assets held for sale
Deferred revenue and acquisition-related intangible liabilities, net	125,628	142,437
Rents received in advance and tenant security deposits	75,701	$ 71,003
Disposal group, held-for-sale \| San Diego
Real estate and other assets held for sale, net
Land	23,158
Buildings and improvements	198,535
Total real estate assets held for sale	221,693
Accumulated depreciation and amortization	(116,693)
Total real estate assets held for sale, net	105,000
Current receivables, net	598
Deferred rent receivables, net	5,433
Deferred leasing costs and acquisition-related intangible assets, net	3,939
Prepaid expenses and other assets, net	185
Total real estate and other assets held for sale, net	115,155
Liabilities related to real estate assets held for sale
Disposal Group, Including Discontinued Operation, Accounts Payable and Accrued Liabilities	663
Deferred revenue and acquisition-related intangible liabilities, net	1,882
Rents received in advance and tenant security deposits	2,400
Disposal Group, Including Discontinued Operation, Liabilities	$ 4,945

Disposal Group, Including Discontinued Operation, Advance Rent, Including Tenant Security Deposits

No definition available.

Name:	krc_DisposalGroupIncludingDiscontinuedOperationAdvanceRentIncludingTenantSecurityDeposits
Namespace Prefix:	krc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

This element represents (1) costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction; (2) the identifiable intangible asset established upon acquisition based on a favorable difference between the terms of an acquired lease and the current market terms for that lease at the acquisition date; and (3) the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property. This element is net of accumulated amortization.

+ References

No definition available.