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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
Aug. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Terms of the Credit Facility      
Outstanding borrowings   $ 0 $ 245,000,000
Kilroy Realty L.P. [Member]      
Terms of the Credit Facility      
Outstanding borrowings   0 245,000,000
Unamortized debt issuance expense   22,400,000  
Kilroy Realty L.P. [Member] | Revolving credit facility [Member]      
Terms of the Credit Facility      
Outstanding borrowings   0 245,000,000
Remaining borrowing capacity   750,000,000 505,000,000
Total borrowing capacity   $ 750,000,000 $ 750,000,000
Interest rate   1.14% 2.76%
Facility fee-annual rate   0.20%  
Contingent additional borrowings   $ 600,000,000.0  
Unamortized debt issuance expense   $ 2,100,000 $ 3,400,000
Kilroy Realty L.P. [Member] | Line of credit [Member]      
Terms of the Credit Facility      
Total borrowing capacity     150,000,000
Kilroy Realty L.P. [Member] | $150.0 million term loan facility [Member] | Line of credit [Member]      
Terms of the Credit Facility      
Extinguishment of debt $ 150,000,000.0    
Outstanding borrowings     150,000,000
Remaining borrowing capacity     $ 0
Interest rate     2.85%
Undrawn facility fee-annual rate     0.20%
Unamortized debt issuance expense     $ 700,000
Kilroy Realty L.P. [Member] | London Interbank Offered Rate (LIBOR) [Member] | Revolving credit facility [Member]      
Terms of the Credit Facility      
Basis spread on LIBOR   1.00% 1.00%
Kilroy Realty L.P. [Member] | London Interbank Offered Rate (LIBOR) [Member] | $150.0 million term loan facility [Member] | Line of credit [Member]      
Terms of the Credit Facility      
Basis spread on LIBOR     1.10%