Acquisitions - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]
Acquisition costs, capitalized	$ 0.8	$ 0.2
Net of credits, and excluding acquisition-related costs	$ 0.8

Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net of Credits, and Excluding Acquisition-Related Costs

No definition available.

Name:	krc_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetOfCreditsAndExcludingAcquisitionRelatedCosts
Namespace Prefix:	krc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant