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v3.25.2

Organization, Ownership, and Basis of Presentation - Operating Properties (Details) | 6 Months Ended
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Jun. 30, 2025 ft² development_project property tenant building propertyHeldForSale
Stabilized Office Properties |
Real Estate Properties [Line Items] |
Number of Buildings | building | 118
Rentable/Actual/Estimated Rentable Square Feet | 16,395,491
Number of Tenants | tenant | 440
Percentage Occupied | 80.80%
Stabilized Residential Properties |
Real Estate Properties [Line Items] |
Number of Properties / Projects | property | 3
Number of Units | property | 1,001
2025 Average Occupancy | 94.50%
Properties held for sale |
Real Estate Properties [Line Items] |
Number of Buildings | building | 4
Rentable/Actual/Estimated Rentable Square Feet | 663,460
Number of Properties / Projects | propertyHeldForSale | 1
In-process development projects - tenant improvement |
Real Estate Properties [Line Items] |
Rentable/Actual/Estimated Rentable Square Feet | 875,000
Number of Properties / Projects | development_project | 1
In-process redevelopment projects - tenant improvement |
Real Estate Properties [Line Items] |
Rentable/Actual/Estimated Rentable Square Feet | 100,000
Number of Properties / Projects | development_project | 2

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- Definition Average Occupancy Percentage + References No definition available. + Details
Name: | krc_AverageOccupancyPercentage
Namespace Prefix: | krc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of Buildings + References No definition available. + Details
Name: | krc_NumberOfBuildings
Namespace Prefix: | krc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of Tenants. + References No definition available. + Details
Name: | krc_NumberOfTenants
Namespace Prefix: | krc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Real Estate Properties, Percentage Occupied + References No definition available. + Details
Name: | krc_RealEstatePropertiesPercentageOccupied
Namespace Prefix: | krc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Net rentable area for properties owned. + References No definition available. + Details
Name: | us-gaap_NetRentableArea
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfUnitsInRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition 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. + References No definition available. + Details
Name: | us-gaap_RealEstatePropertiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=krc_StabilizedOfficePropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=krc_StabilizedResidentialPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=krc_PropertiesHeldForSaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=krc_DevelopmentProjectsTenantImprovementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=krc_RedevelopmentProjectsTenantImprovementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |