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Secured and Unsecured Debt of the Operating Partnership - Capitalized Interest (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Capitalized Interest and Loan Fees [Line Items] |  |
Interest expense | $ 31,148 | $ 38,871
Kilroy Realty L.P. |  |
Capitalized Interest and Loan Fees [Line Items] |  |
Gross interest expense | 51,696 | 58,678
Capitalized interest | (20,548) | (19,807)
Interest expense | $ 31,148 | $ 38,871

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