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Schedule III - Real Estate and Accumulated Depreciation - Narrative (Details) $ in Thousands	Dec. 31, 2024 USD ($) property	Dec. 31, 2023 USD ($)
Real Estate and Accumulated Depreciation [Line Items]
Investment in real estate, federal Income tax basis	$ 10,400,000
Kilroy Realty L.P.
Real Estate and Accumulated Depreciation [Line Items]
Long-term debt, gross	4,631,688
Kilroy Realty L.P. | Secured debt
Real Estate and Accumulated Depreciation [Line Items]
Unamortized debt issuance expense	8,489	$ 9,469
3.57% Mortgage Payable due December 2026 | Kilroy Realty L.P.
Real Estate and Accumulated Depreciation [Line Items]
Long-term debt, gross	152,700
3.57% Mortgage Payable due December 2026 | Kilroy Realty L.P. | Secured debt
Real Estate and Accumulated Depreciation [Line Items]
Long-term debt, gross	152,668	156,386
4.48% Mortgage Payable due July 2027 | Kilroy Realty L.P. | Secured debt
Real Estate and Accumulated Depreciation [Line Items]
Long-term debt, gross	79,020	81,308
5.90% Mortgage Payable due August 2034 | Kilroy Realty L.P.
Real Estate and Accumulated Depreciation [Line Items]
Long-term debt, gross	375,000
5.90% Mortgage Payable due August 2034 | Kilroy Realty L.P. | Secured debt
Real Estate and Accumulated Depreciation [Line Items]
Long-term debt, gross	375,000	$ 375,000
Office Building
Real Estate and Accumulated Depreciation [Line Items]
Unamortized debt issuance expense	$ 8,500
Office Building | Sunset Blvd., Gower St. and El Centro Ave. Properties in Los Angeles
Real Estate and Accumulated Depreciation [Line Items]
Number of buildings | property	5
Residential Tower | Sunset Blvd., Gower St. and El Centro Ave. Properties in Los Angeles
Real Estate and Accumulated Depreciation [Line Items]
Number of buildings | property	1
Building
Real Estate and Accumulated Depreciation [Line Items]
Depreciation life	35 years
Tenant Improvements | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Property depreciable lives	1 year
Tenant Improvements | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Property depreciable lives	20 years

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