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Secured and Unsecured Debt of the Operating Partnership - Capitalized Interest (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Capitalized Interest and Loan Fees [Line Items]
Interest expense	$ 32,152	$ 36,408	$ 94,144	$ 112,042
Kilroy Realty L.P.
Capitalized Interest and Loan Fees [Line Items]
Gross interest expense	54,726	57,235	158,599	173,191
Capitalized interest	(22,574)	(20,827)	(64,455)	(61,149)
Interest expense	$ 32,152	$ 36,408	$ 94,144	$ 112,042

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Total interest costs incurred during the period and either capitalized or charged against earnings.

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-Topic 835
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