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Secured and Unsecured Debt of the Operating Partnership - Capitalized Interest and Loan Fees (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Capitalized Interest and Loan Fees [Line Items]
Interest expense	$ 38,871	$ 25,671
Kilroy Realty L.P.
Capitalized Interest and Loan Fees [Line Items]
Gross interest expense	58,678	43,402
Capitalized interest and deferred financing costs	(19,807)	(17,731)
Interest expense	$ 38,871	$ 25,671

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