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Organization and Ownership (Details) | 12 Months Ended
--- | ---
Dec. 31, 2021 ft² redevelopmentProject property project tenant
Real Estate Properties [Line Items] |
Rentable Square Feet (unaudited) | 15,456,528
In-process development projects - tenant improvement |
Real Estate Properties [Line Items] |
Rentable Square Feet (unaudited) | 1,604,000
Number of Projects | property | 3
In-process development projects - under construction |
Real Estate Properties [Line Items] |
Rentable Square Feet (unaudited) | 946,000
Number of Projects | project | 2
In-process redevelopment projects - under construction |
Real Estate Properties [Line Items] |
Rentable Square Feet (unaudited) | 96,000
Number of Projects | project | 1
Number of redevelopment projects excluded | redevelopmentProject | 2
Stabilized Office Properties |
Real Estate Properties [Line Items] |
Number of Buildings | property | 120
Rentable Square Feet (unaudited) | 15,456,528
Number of Tenants | tenant | 422
Percentage Occupied (unaudited) | 91.90%
Percentage Leased (unaudited) | 93.90%
Stabilized Residential Properties |
Real Estate Properties [Line Items] |
Number of Projects | property | 3
Number of Units | property | 1,001
2021 Average Occupancy (unaudited) | 78.00%

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- Definition Average Occupancy Percentage + References No definition available. + Details
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Namespace Prefix: | krc_
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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 Redevelopment Projects Excluded + References No definition available. + Details
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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
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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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Balance Type: | na
Period Type: | instant

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- Definition Real Estate Properties, Percentage Occupied + References No definition available. + Details
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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
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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
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Namespace Prefix: | us-gaap_
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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
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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