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Secured and Unsecured Debt of the Operating Partnership - Debt Maturities (Details) - Kilroy Realty, L.P. [Member] - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Stated debt maturities and scheduled amortization payments, excluding debt discounts    
Remaining 2016 $ 7,356  
2017 71,734  
2018 451,713  
2019 340,355  
2020 251,962  
Thereafter 1,189,198  
Total debt [1] 2,312,318  
Unamortized debt issuance costs 12,500  
Unsecured Senior Notes [Member]    
Stated debt maturities and scheduled amortization payments, excluding debt discounts    
Unamortized discount (7,200)  
Secured Debt [Member]    
Stated debt maturities and scheduled amortization payments, excluding debt discounts    
Total debt 379,086 $ 381,918
Unamortized premium $ 5,800 $ 6,200
[1] Includes gross principal balance of outstanding debt