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Secured and Unsecured Debt of the Operating Partnership - Unsecured Senior Notes, Unsecured Revolving Credit Facility and Term Loan Facility (Details) - Kilroy Realty L.P.
 6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
extension_option
Dec. 31, 2023
USD ($)
extension_option
Revolving Credit Facility and Term Loan Facility | Adjusted SOFR | Unsecured Revolving Credit Facility    
Terms of the Borrowing Facilities    
Variable rate (percent) 0.10% 0.10%
Revolving Credit Facility | Unsecured Revolving Credit Facility    
Terms of the Borrowing Facilities    
Outstanding borrowings $ 0 $ 0
Remaining borrowing capacity 1,100,000,000 1,100,000,000
Total borrowing capacity $ 1,100,000,000 $ 1,100,000,000
Interest rate (percent) 6.33% 6.38%
Facility fee-annual rate (percent) 0.20% 0.20%
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% 0.01%
Unamortized deferred financing costs $ 14,500,000 $ 3,200,000
Number of extension options | extension_option 2 2
Extension period (in months) 6 months 6 months
Revolving Credit Facility | SOFR | Unsecured Revolving Credit Facility    
Terms of the Borrowing Facilities    
Variable rate (percent) 0.90% 0.90%
Term Loan Facility | 2022 Term Loan Facility    
Terms of the Borrowing Facilities    
Outstanding borrowings $ 120,000,000 $ 520,000,000
Remaining borrowing capacity 0 0
Total borrowing capacity $ 120,000,000 $ 520,000,000
Interest rate (percent) 6.39% 6.41%
Facility fee-annual rate (percent) 0.20% 0.20%
Unamortized deferred financing costs   $ 2,300,000
Extension period (in months) 12 months 12 months
Term Loan Facility | SOFR | 2024 Term Loan Facility    
Terms of the Borrowing Facilities    
Variable rate (percent) 0.95%  
Term Loan Facility | SOFR | 2022 Term Loan Facility    
Terms of the Borrowing Facilities    
Variable rate (percent) 0.95% 0.95%
Unsecured debt, net | 2024 Term Loan Facility    
Terms of the Borrowing Facilities    
Number of extension options | extension_option 2  
Extension period (in months) 12 months  
Unsecured debt, net | 2022 Term Loan Facility    
Terms of the Borrowing Facilities    
Number of extension options | extension_option 2  
Extension period (in months) 12 months  
Line of Credit | 2024 Term Loan Facility    
Terms of the Borrowing Facilities    
Outstanding borrowings $ 200,000,000  
Remaining borrowing capacity 0  
Total borrowing capacity $ 200,000,000  
Interest rate (percent) 6.38%  
Contingent additional borrowings $ 130,000,000.0  
Unamortized deferred financing costs $ 2,300,000