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Secured and Unsecured Debt of the Operating Partnership - Additional Information (Details)
 1 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
debt_covenant
Mar. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
debt_covenant
Sep. 30, 2023
USD ($)
Jan. 31, 2024
USD ($)
Debt Instrument [Line Items]          
Repayments of unsecured debt (Note 5)     $ 320,000,000 $ 0  
Kilroy Realty L.P.          
Debt Instrument [Line Items]          
Long-term debt $ 5,036,923,000   5,036,923,000    
Repayments of unsecured debt (Note 5)     $ 320,000,000 $ 0  
Number of noncompliant debt covenants that could require immediate repayment of full principal balance of associated debt | debt_covenant 1   1    
6.250% Unsecured Senior Notes Due 2036 | Unsecured debt, net | Kilroy Realty L.P.          
Debt Instrument [Line Items]          
Long-term debt         $ 400,000,000.0
Initial issuance discount         $ 4,500,000
Stated interest rate on debt (percent)         6.25%
Unsecured Term Loan Facility | Revolving credit facility | Kilroy Realty L.P.          
Debt Instrument [Line Items]          
Borrowing facility, maximum borrowing capacity   $ 1,100,000,000      
Unsecured Term Loan Facility | Term Loan Facility | Kilroy Realty L.P.          
Debt Instrument [Line Items]          
Borrowing facility, maximum borrowing capacity   520,000,000      
Repayments of unsecured debt (Note 5) $ 120,000,000 200,000,000      
Unsecured New Term Loan Facility | Term Loan Facility | Kilroy Realty L.P.          
Debt Instrument [Line Items]          
Unsecured senior note   200,000,000      
Borrowing facility, remaining borrowing capacity   $ 320,000,000      
Borrowing facility, maturity date extension period   12 months