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v3.20.4

Organization and Ownership (Details) | Dec. 31, 2020 ft² property residential_unit building project tenant
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Real Estate Properties [Line Items] |
Rentable Square Feet | 14,620,166
Stabilized office properties [Member] |
Real Estate Properties [Line Items] |
Number of buildings | building | 117
Rentable Square Feet | 14,620,166
Number of Tenants | tenant | 447
Percentage Occupied | 91.20%
Percentage Leased (unaudited) | 94.30%
Stabilized residential properties [Member] |
Real Estate Properties [Line Items] |
Number of buildings | property | 2
Percentage Occupied | 72.00%
Number of residential units | property | 808
In-process development projects - tenant improvement [Member] |
Real Estate Properties [Line Items] |
Number of buildings | property | 3
Rentable Square Feet | 1,080,000
In-process development projects - under construction [Member] |
Real Estate Properties [Line Items] |
Number of buildings | project | 3
Rentable Square Feet | 856,000
Number of residential units | residential_unit | 193

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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

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

X
- Definition Real Estate Properties, Percentage Leased + References No definition available. + Details
Name: | krc_RealEstatePropertiesPercentageLeased
Namespace Prefix: | krc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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

X
- 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

X
- 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_MajorPropertyClassAxis=krc_OfficePropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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