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Debt Maturities (Details 4) (Debt [Member], Kilroy Realty, L.P. [Member], USD $)
Mar. 31, 2014
Debt [Member] | Kilroy Realty, L.P. [Member]
 
Stated debt maturities and scheduled amortization payments, excluding debt discounts  
Remaining 2014 $ 262,932,000
2015 395,104,000
2016 249,431,000
2017 71,748,000
2018 451,728,000
Thereafter 718,011,000
Total 2,148,954,000 [1]
Unamortized discount (premium) $ (8,700,000)
[1] Includes gross principal balance of outstanding debt before impact of net unamortized premiums totaling approximately $8.7 million.