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Organization, Ownership and Basis of Presentation - Operating Properties (Details) | 9 Months Ended
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Sep. 30, 2023 ft² tenant development_project property building
Stabilized Office Properties |
Real Estate Properties [Line Items] |
Number of Buildings | building | 120
Rentable Square Feet | 16,285,153
Number of Tenants | tenant | 401
Percentage Occupied | 86.20%
Percentage Leased | 87.50%
Stabilized Residential Properties |
Real Estate Properties [Line Items] |
Number of Projects | property | 3
Number of Units | property | 1,001
2023 Average Occupancy | 92.90%
In-process development projects - tenant improvement |
Real Estate Properties [Line Items] |
Rentable Square Feet | 734,000
Number of Projects | development_project | 1
In-process development projects - under construction |
Real Estate Properties [Line Items] |
Rentable Square Feet | 875,000
Number of Projects | development_project | 1
In-process redevelopment projects - under construction |
Real Estate Properties [Line Items] |
Rentable Square Feet | 100,000
Number of Projects | development_project | 2

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

X
- 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 Leased + References No definition available. + Details
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Namespace Prefix: | krc_
Data Type: | dtr-types1:percentItemType
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
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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_DevelopmentProjectsTenantImprovementMember
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: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |