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Supplemental Cash Flow Information of the Operating Partnership - Supplemental Cash Flow (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
SUPPLEMENTAL CASH FLOWS INFORMATION:
Capitalized interest	$ 53,637	$ 55,080
Cash paid for interest, net of capitalized interest of $53,637 and $55,080 as of September 30, 2023 and 2022, respectively	60,528	43,838
Cash paid for amounts included in the measurement of ground lease liabilities	4,939	4,719
NON-CASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	98,631	97,014
Tenant improvements funded directly by tenants	6,026	7,397
NON-CASH FINANCING TRANSACTIONS:
Accrual of distributions payable to common unitholders (Note 14)	64,423	64,271
Kilroy Realty L.P.
SUPPLEMENTAL CASH FLOWS INFORMATION:
Capitalized interest	53,637	55,080
Cash paid for interest, net of capitalized interest of $53,637 and $55,080 as of September 30, 2023 and 2022, respectively	60,528	43,838
Cash paid for amounts included in the measurement of ground lease liabilities	4,939	4,719
NON-CASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	98,631	97,014
Tenant improvements funded directly by tenants	6,026	7,397
NON-CASH FINANCING TRANSACTIONS:
Accrual of distributions payable to common unitholders (Note 14)	$ 64,423	$ 64,271

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