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Secured and Unsecured Debt of the Operating Partnership - Schedule of Debt Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Unamortized deferred financing costs	$ (10,035)	$ (12,692)
Kilroy Realty L.P.
Debt Instrument [Line Items]
Remaining 2025	1,584
2026	601,317
2027	249,125
2028	400,000
2029	475,000
2030	500,000
Thereafter	2,400,000
Total aggregate principal value	4,627,026
Less: unamortized net discounts and deferred financing costs	(37,515)
Total debt, net	4,589,511
Kilroy Realty L.P. | Unsecured Senior Notes
Debt Instrument [Line Items]
Unamortized deferred financing costs	(26,100)
Kilroy Realty L.P. | Senior Notes
Debt Instrument [Line Items]
Unamortized discounts for the unsecured senior notes	$ (11,400)

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