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Secured and Unsecured Debt of the Operating Partnership - Secured Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Secured Debt    
Secured debt $ 258,593 $ 335,531
Kilroy Realty L.P. [Member]    
Secured Debt    
Long-term debt, gross 3,579,502  
Secured debt 258,593 335,531
Unamortized Deferred Financing Costs (20,300)  
Kilroy Realty L.P. [Member] | Secured debt [Member]    
Secured Debt    
Secured debt 259,502 336,570
Unamortized Deferred Financing Costs (909) (1,039)
Long-term debt 258,593 335,531
Net book value of properties pledged as collateral for secured debt $ 251,200  
Kilroy Realty L.P. [Member] | Secured debt [Member] | 3.57% Mortgage Payable due December 2026 [Member]    
Secured Debt    
Stated interest rate 3.57%  
Effective interest rate 3.57%  
Long-term debt, gross $ 170,000 170,000
Kilroy Realty L.P. [Member] | Secured debt [Member] | 4.48% Mortgage Payable due July 2027 [Member]    
Secured Debt    
Stated interest rate 4.48%  
Effective interest rate 4.48%  
Long-term debt, gross $ 89,502 91,332
Kilroy Realty L.P. [Member] | Secured debt [Member] | 6.05% Mortgage Payable Due June 1, 2019 [Member]    
Secured Debt    
Stated interest rate 6.05%  
Effective interest rate 3.50%  
Long-term debt, gross $ 0 $ 75,238