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Secured and Unsecured Debt of the Operating Partnership - Capitalized Interest (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Capitalized Interest and Loan Fees [Line Items]
Interest expense	$ 30,844	$ 36,763	$ 61,992	$ 75,634
Kilroy Realty L.P.
Capitalized Interest and Loan Fees [Line Items]
Gross interest expense	52,177	57,278	103,873	115,956
Capitalized interest	(21,333)	(20,515)	(41,881)	(40,322)
Interest expense	$ 30,844	$ 36,763	$ 61,992	$ 75,634

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