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Secured and Unsecured Debt of the Operating Partnership (Details 2) (USD $)
In Thousands
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Capitalized interest and loan fees    
Interest expense (Note 5)$ 24,051$ 15,853$ 66,155$ 40,897
Kilroy Realty, L.P. [Member]
    
Stated debt maturities and scheduled amortization payments, excluding debt discounts    
Remaining 201170,371 70,371 
2012305,303 305,303 
20136,373 6,373 
2014262,443 262,443 
2015357,382 357,382 
Thereafter775,028 775,028 
Total1,776,900[1] 1,776,900[1] 
Capitalized interest and loan fees    
Gross interest expense26,44918,54372,59748,980
Capitalized interest(2,398)(2,690)(6,442)(8,083)
Interest expense (Note 5)$ 24,051$ 15,853$ 66,155$ 40,897
[1]Includes gross principal balance of outstanding debt before impact of all debt discounts and premiums.