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CONSOLIDATED STATEMENTS OF CAPITAL (KILROY REALTY, L.P.) - Parenthetical - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Kilroy Realty L.P. [Member] |  |  |
Distributions declared per common unit (in dollars per units) | $ 1.97 | $ 1.91 | $ 1.79

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- Definition Cash dividends declared or paid to each outstanding limited partnership and general partnership unit during the reporting period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=krc_KilroyRealtyL.P.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |