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Secured and Unsecured Debt of the Operating Partnership - Capitalized Interest and Loan Fees (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Capitalized Interest and Loan Fees [Line Items] |  |  |  |
Interest expense | $ 36,408 | $ 29,837 | $ 112,042 | $ 81,891
Kilroy Realty L.P. |  |  |  |
Capitalized Interest and Loan Fees [Line Items] |  |  |  |
Gross interest expense | 57,235 | 49,893 | 173,191 | 139,148
Capitalized interest and deferred financing costs | (20,827) | (20,056) | (61,149) | (57,257)
Interest expense | $ 36,408 | $ 29,837 | $ 112,042 | $ 81,891

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