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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Capitalized Interest and Loan Fees [Line Items]      
Interest expense $ 114,216 $ 84,278 $ 78,555
Kilroy Realty L.P.      
Capitalized Interest and Loan Fees [Line Items]      
Gross interest expense 192,983 161,761 158,756
Capitalized interest and deferred financing costs (78,767) (77,483) (80,201)
Interest expense $ 114,216 $ 84,278 $ 78,555