Supplemental Cash Flow Information of the Operating Partnership - Reconciliation of Cash and Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH:
Cash and cash equivalents	$ 249,981	$ 414,077	$ 348,417	$ 731,991
Restricted cash	13,009	13,006	13,042	91,139
Cash and cash equivalents and restricted cash	262,990	427,083	361,459	823,130
Kilroy Realty L.P.
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH:
Cash and cash equivalents	249,981	414,077	348,417	731,991
Restricted cash	13,009	13,006	13,042	91,139
Cash and cash equivalents and restricted cash	$ 262,990	$ 427,083	$ 361,459	$ 823,130