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Secured and Unsecured Debt of the Operating Partnership - Capitalized Interest and Loan Fees (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Capitalized Interest and Loan Fees [Line Items] |  |
Interest expense | $ 38,871 | $ 25,671
Kilroy Realty L.P. |  |
Capitalized Interest and Loan Fees [Line Items] |  |
Gross interest expense | 58,678 | 43,402
Capitalized interest and deferred financing costs | (19,807) | (17,731)
Interest expense | $ 38,871 | $ 25,671

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