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Secured and Unsecured Debt of the Operating Partnership - Schedule of Unsecured Revolving Credit Facility (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2025
Sep. 30, 2025
USD ($)
extension_option
Dec. 31, 2024
USD ($)
extension_option
Line of Credit Facility [Line Items]      
Unamortized deferred financing costs   $ 10,035,000 $ 12,692,000
Unsecured Revolving Credit Facility | Revolving credit facility | Kilroy Realty L.P.      
Line of Credit Facility [Line Items]      
Outstanding borrowings   0 0
Borrowing facility, remaining borrowing capacity   1,100,000,000 1,100,000,000
Borrowing facility, maximum borrowing capacity   $ 1,100,000,000 $ 1,100,000,000
Interest rate (percent)   5.44% 5.69%
Facility fee-annual rate (percent)   0.25% 0.25%
Unamortized deferred financing costs   $ 10,035,000 $ 12,692,000
Outstanding letters of credit   5,200,000 5,200,000
Contingent additional borrowings   $ 500,000,000.0 $ 500,000,000.0
Reduction interest rate   0.01%  
Number of extension options | extension_option   2 2
Extension period (in months) 6 months 6 months  
Unsecured Revolving Credit Facility | Revolving credit facility | Kilroy Realty L.P. | SOFR      
Line of Credit Facility [Line Items]      
Variable rate (percent)   1.10% 1.10%
Unsecured Revolving Credit Facility | Revolving Credit Facility and Term Loan Facility | Kilroy Realty L.P. | Adjusted SOFR      
Line of Credit Facility [Line Items]      
Variable rate (percent)   0.10% 0.10%
2024 Term Loan Facility | Term Loan Facility | Kilroy Realty L.P.      
Line of Credit Facility [Line Items]      
Outstanding borrowings   $ 200,000,000 $ 200,000,000
Interest rate (percent)   5.46% 5.70%
Unamortized deferred financing costs   $ 368,000 $ 1,229,000
Contingent additional borrowings   $ 130,000,000.0 $ 130,000,000.0
2024 Term Loan Facility | Term Loan Facility | Kilroy Realty L.P. | SOFR      
Line of Credit Facility [Line Items]      
Variable rate (percent)   1.20% 1.20%
2024 Term Loan Facility | Unsecured debt, net | Kilroy Realty L.P.      
Line of Credit Facility [Line Items]      
Extension period (in months)   12 months