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Secured and Unsecured Debt of the Operating Partnership - Unsecured Senior Notes - Registered Offerings and Private Placement (Details) - USD ($)	1 Months Ended	12 Months Ended
	Oct. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Aug. 31, 2020	Apr. 30, 2020
Debt Instrument [Line Items]
Loss on early extinguishment of debt (Note 9)		$ (12,246,000)	$ 0	$ 0
Net gain on sales of land (Note 4)		(12,200,000)
2.650% Unsecured Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 450,000,000	$ 450,000,000	0
Stated interest rate	2.65%	2.65%
Unsecured debt
Debt Instrument [Line Items]
Unamortized discount (premium), net		$ (7,400,000)	(8,300,000)
Kilroy Realty L.P.
Debt Instrument [Line Items]
Long-term debt, gross		4,099,023,000
Loss on early extinguishment of debt (Note 9)		(12,246,000)	0	$ 0
Kilroy Realty L.P. | Unsecured debt | 2.500% Unsecured Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross		425,000,000	425,000,000
Unamortized discount (premium), net	$ (200,000)				$ (2,700,000)
Stated interest rate					2.50%
Principal amount					$ 425,000,000
Kilroy Realty L.P. | Unsecured debt | 4.270% Unsecured Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross		$ 350,000,000	350,000,000
Stated interest rate		4.27%				4.27%
Principal amount						$ 350,000,000
Kilroy Realty L.P. | Unsecured debt | 3.800% Unsecured Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 300,000,000	$ 0	$ 300,000,000
Stated interest rate	3.80%	3.80%
Premium paid to the note holders at the redemption date	$ 12,100,000
Write-off of unamortized discount and unamortized deferred financing costs	$ 100,000

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