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Supplemental Cash Flow Information of the Operating Partnership - Reconciliation of Cash and Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Dec. 31, 2023
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH:
Cash and cash equivalents	$ 372,416	$ 165,690	$ 625,395	$ 510,163
Restricted cash	0	0	0	0
Cash and cash equivalents and restricted cash	372,416	165,690	625,395	510,163
Kilroy Realty L.P.
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH:
Cash and cash equivalents	372,416	165,690	625,395	510,163
Restricted cash	0	0	0	0
Cash and cash equivalents and restricted cash	$ 372,416	$ 165,690	$ 625,395	$ 510,163

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