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Secured and Unsecured Debt of the Operating Partnership - Additional Information (Details)
 1 Months Ended 3 Months Ended
Mar. 31, 2024
USD ($)
debt_covenant
Mar. 31, 2024
USD ($)
debt_covenant
Mar. 31, 2023
USD ($)
Jan. 31, 2024
USD ($)
Debt Instrument [Line Items]        
Repayments of unsecured debt (Note 4)   $ 200,000,000 $ 0  
Kilroy Realty L.P.        
Debt Instrument [Line Items]        
Long-term debt $ 5,159,926,000 5,159,926,000    
Repayments of unsecured debt (Note 4)   $ 200,000,000 $ 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
Initial issuance discount       $ 4,500,000
Stated interest rate on debt (percent)       6.25%
Unsecured Term Loan Facility | Term Loan Facility | Kilroy Realty L.P.        
Debt Instrument [Line Items]        
Borrowing facility, maximum borrowing capacity $ 520,000,000 $ 520,000,000    
Repayments of unsecured debt (Note 4) 200,000,000      
Unsecured Term Loan Facility | Revolving credit facility | Kilroy Realty L.P.        
Debt Instrument [Line Items]        
Borrowing facility, maximum borrowing capacity 1,100,000,000 1,100,000,000    
Unsecured New Term Loan Facility | Term Loan Facility | Kilroy Realty L.P.        
Debt Instrument [Line Items]        
Unsecured senior note 200,000,000 200,000,000    
Borrowing facility, remaining borrowing capacity $ 320,000,000 $ 320,000,000