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Secured and Unsecured Debt of the Operating Partnership - Secured Debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Secured Debt    
Secured debt, net $ 472,772 $ 380,835
Amortization of debt issuance costs 1,400  
Debt premium 4,400  
Secured debt [Member]    
Secured Debt    
Amortization of debt issuance costs   1,100
Kilroy Realty, L.P. [Member]    
Secured Debt    
Long-term debt, gross 2,333,766  
Secured debt, net 472,772 380,835
Kilroy Realty, L.P. [Member] | Secured debt [Member]    
Secured Debt    
Secured debt, net 474,168 381,918
Long-term debt 472,772 380,835
Debt premium 4,400  
Net book value of properties pledged as collateral for secured debt $ 570,600  
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%  
Maturity date Dec. 01, 2026  
Long-term debt, gross $ 170,000 0
Kilroy Realty, L.P. [Member] | Secured debt [Member] | 4.27% Mortgage Payable due Feb 1, 2018 [Member]    
Secured Debt    
Stated interest rate 4.27%  
Effective interest rate 4.27%  
Maturity date Feb. 01, 2018  
Long-term debt, gross $ 125,756 128,315
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%  
Maturity date Jul. 01, 2027  
Long-term debt, gross $ 94,754 96,354
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%  
Maturity date Jun. 01, 2019  
Long-term debt, gross $ 82,443 85,890
Debt premium $ 4,400 6,200
Kilroy Realty, L.P. [Member] | Secured debt [Member] | 7.15% Mortgage Payable due May 1, 2017 [Member]    
Secured Debt    
Stated interest rate 7.15%  
Effective interest rate 7.15%  
Maturity date May 01, 2017  
Long-term debt, gross $ 1,215 3,987
Kilroy Realty, L.P. [Member] | Secured debt [Member] | 6.51% Mortgage Payable due February 1, 2017 [Member]    
Secured Debt    
Stated interest rate 6.51%  
Effective interest rate 6.51%  
Maturity date Feb. 01, 2017  
Long-term debt, gross $ 0 65,563
Kilroy Realty, L.P. [Member] | Secured debt [Member] | Other [Member]    
Secured Debt    
Long-term debt, gross $ 0 $ 1,809