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Secured and Unsecured Debt of the Operating Partnership - Unsecured Revolving Credit Facility and Term Loan Facility (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]            
Repayments of unsecured debt $ 403,700,000     $ 723,712,000 $ 0 $ 0
Principal amount of debt 425,000,000     425,000,000    
Kilroy Realty L.P.            
Debt Instrument [Line Items]            
Repayments of unsecured debt       723,712,000 0 $ 0
Revolving credit facility | Kilroy Realty L.P.            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity 1,100,000,000     1,100,000,000 1,100,000,000  
Remaining borrowing capacity $ 1,100,000,000     $ 1,100,000,000 $ 1,100,000,000  
Revolving credit facility | Kilroy Realty L.P. | 2022 Term Loan Facility            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity     $ 1,100,000,000      
Term Loan Facility | Kilroy Realty L.P. | 2022 Term Loan Facility            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity     520,000,000      
Repayments of unsecured debt   $ 120,000,000 200,000,000      
Term Loan Facility | Kilroy Realty L.P. | Unsecured New Term Loan Facility            
Debt Instrument [Line Items]            
Principal amount of debt     200,000,000      
Remaining borrowing capacity     $ 320,000,000      
Maturity period     12 months