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Secured and Unsecured Debt of the Operating Partnership - Capitalized Interest and Loan Fees (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |
Interest expense | $ 70,772 | $ 48,537 | $ 49,721
Kilroy Realty L.P. [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Gross interest expense | 150,325 | 129,778 | 117,789
Capitalized interest and deferred financing costs | (79,553) | (81,241) | (68,068)
Interest expense | $ 70,772 | $ 48,537 | $ 49,721

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