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Organization, Ownership, and Basis of Presentation - Operating Properties (Details) | 9 Months Ended
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Sep. 30, 2024 ft² development_project building tenant property
Stabilized Office Properties |
Real Estate Properties [Line Items] |
Number of Buildings | building | 123
Rentable/Estimated Rentable Square Feet | 17,140,465
Number of Tenants | tenant | 424
Percentage Occupied | 84.30%
Stabilized Residential Properties |
Real Estate Properties [Line Items] |
Number of Properties/Projects | property | 3
Number of Units | property | 1,001
2024 Average Occupancy | 92.60%
In-process redevelopment projects - tenant improvement |
Real Estate Properties [Line Items] |
Rentable/Estimated Rentable Square Feet | 100,000
Number of Properties/Projects | development_project | 2
In-process development projects - under construction |
Real Estate Properties [Line Items] |
Rentable/Estimated Rentable Square Feet | 875,000
Number of Properties/Projects | development_project | 1

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- Definition Average Occupancy Percentage + References No definition available. + Details
Name: | krc_AverageOccupancyPercentage
Namespace Prefix: | krc_
Data Type: | dtr-types1: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-types1: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
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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
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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_RedevelopmentProjectsTenantConstructionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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