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Schedule III - Real Estate and Accumulated Depreciation (Details) (Textuals) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Apr. 30, 2011
Real Estate and Accumulated Depreciation [Line Items]      
Secured Debt $ 561,096,000 $ 351,825,000  
Kilroy Realty, L.P. [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Secured Debt 561,096,000 351,825,000  
Kilroy Realty, L.P. [Member] | Secured Debt [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Secured Debt 561,096,000 [1] 351,825,000 [1]  
Debt premium 8,900,000    
7.15% Mortgage Payable due May 1, 2017 [Member] | Kilroy Realty, L.P. [Member] | Secured Debt [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Secured Debt 11,210,000 [1] 13,294,000 [1]  
6.51% Mortgage Payable due February 1, 2017 [Member] | Kilroy Realty, L.P. [Member] | Secured Debt [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Secured Debt 68,615,000 [1] 69,507,000 [1]  
5.57% Mortgage Payable due August 1, 2012 [Member] | Kilroy Realty, L.P. [Member] | Secured Debt [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Secured Debt 0 [1],[2] 71,517,000 [1],[2]  
4.95% Mortgage Payable due August 1, 2012 [Member] | Kilroy Realty, L.P. [Member] | Secured Debt [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Secured Debt 0 [1],[2] 29,754,000 [1],[2]  
4.27% Mortgage Payable due Feb 1, 2018 [Member] | Kilroy Realty, L.P. [Member] | Secured Debt [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Secured Debt 135,000,000 [1] 135,000,000 [1]  
4.94% Mortgage Payable due April 15, 2015 [Member] | Kilroy Realty, L.P. [Member] | Secured Debt [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Secured Debt 28,941,000 [1],[3] 30,191,000 [1],[3]  
Debt premium     $ 1,000,000
[1] Amounts reported include the amounts of unamortized debt premiums and discounts for the periods presented.
[2] In May 2012, we repaid these loans prior to the stated maturity.
[3] The secured debt and the related properties that secure the debt are held in a special purpose entity and the properties are not available to satisfy the debts and other obligations of the Company or the Operating Partnership.