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Secured and Unsecured Debt of the Operating Partnership - Capitalized Interest and Loan Fees (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Capitalized Interest and Loan Fees [Line Items] |  |  |  |
Interest expense | $ 36,763 | $ 26,383 | $ 75,634 | $ 52,054
Kilroy Realty L.P. |  |  |  |
Capitalized Interest and Loan Fees [Line Items] |  |  |  |
Gross interest expense | 57,278 | 45,853 | 115,956 | 89,255
Capitalized interest and deferred financing costs | (20,515) | (19,470) | (40,322) | (37,201)
Interest expense | $ 36,763 | $ 26,383 | $ 75,634 | $ 52,054

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