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Secured and Unsecured Debt of the Operating Partnership - Debt Maturities (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Oct. 31, 2022
extension_option
Dec. 31, 2022
USD ($)
extension_option
debt_covenant
Dec. 31, 2021
USD ($)
Stated debt maturities and scheduled amortization payments, excluding debt discounts      
Number of noncompliant debt covenants that could require immediate repayment of full principal balance of associated debt | debt_covenant   1  
Unsecured debt      
Stated debt maturities and scheduled amortization payments, excluding debt discounts      
Long-term debt   $ 4,000,000 $ 3,800,000
Unsecured Term Loan Facility | Unsecured debt      
Stated debt maturities and scheduled amortization payments, excluding debt discounts      
Number of extension options | extension_option 2    
Extension period (in months) 12 months    
Kilroy Realty L.P.      
Stated debt maturities and scheduled amortization payments, excluding debt discounts      
2023   5,775  
2024   631,006  
2025   406,246  
2026   401,317  
2027   249,125  
Thereafter   2,600,000  
Total aggregate principal value   4,293,469  
Kilroy Realty L.P. | Unsecured Term Loan Facility, Unsecured Senior Notes and Secured Debt      
Stated debt maturities and scheduled amortization payments, excluding debt discounts      
Unamortized debt issuance expense   (24,100)  
Kilroy Realty L.P. | Unsecured senior notes      
Stated debt maturities and scheduled amortization payments, excluding debt discounts      
Debt issuance discount   (6,400)  
Kilroy Realty L.P. | Unsecured Term Loan Facility | Unsecured debt      
Stated debt maturities and scheduled amortization payments, excluding debt discounts      
Long-term debt   $ 200,000  
Number of extension options | extension_option   2  
Extension period (in months)   12 months