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Secured and Unsecured Debt of the Operating Partnership - Capitalized Interest and Loan Fees (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Capitalized Interest and Loan Fees [Line Items]
Interest expense	$ 29,837	$ 19,982	$ 81,891	$ 60,728
Kilroy Realty L.P.
Capitalized Interest and Loan Fees [Line Items]
Gross interest expense	49,893	39,659	139,148	118,995
Capitalized interest and deferred financing costs	(20,056)	(19,677)	(57,257)	(58,267)
Interest expense	$ 29,837	$ 19,982	$ 81,891	$ 60,728

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