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Secured and Unsecured Debt of the Operating Partnership (Details 3) (USD $)
9 Months Ended9 Months Ended12 Months Ended1 Months Ended9 Months Ended12 Months Ended9 Months Ended12 Months Ended9 Months Ended12 Months Ended1 Months Ended
Sep. 30, 2011
NumberofTradingDays
Years
RSF
NumberofBuildings
Share_Based_Incentive_Compensation_Plans
Sep. 30, 2010
Apr. 30, 2011
Kilroy Realty, L.P. [Member]
Drive Lake Washington Boulevard Kirkland Member
4.94% Mortgage Payable due April 15, 2015 [Member]
NumberofBuildings
Sep. 30, 2011
Kilroy Realty, L.P. [Member]
Dec. 31, 2010
Kilroy Realty, L.P. [Member]
Sep. 30, 2010
Kilroy Realty, L.P. [Member]
Apr. 30, 2011
Kilroy Realty, L.P. [Member]
4.94% Mortgage Payable due April 15, 2015 [Member]
Years
Sep. 30, 2011
Kilroy Realty, L.P. [Member]
3.25% Exchangeable Notes [Member]
Dec. 31, 2010
Kilroy Realty, L.P. [Member]
3.25% Exchangeable Notes [Member]
Sep. 30, 2011
Kilroy Realty, L.P. [Member]
4.25% Exchangeable Notes [Member]
Dec. 31, 2010
Kilroy Realty, L.P. [Member]
4.25% Exchangeable Notes [Member]
Sep. 30, 2011
Kilroy Realty, L.P. [Member]
New Amendment to Credit Facility [Member]
Dec. 31, 2010
Kilroy Realty, L.P. [Member]
Prior Credit Facility [Member]
Jan. 31, 2011
Kilroy Realty, L.P. [Member]
4.27% Mortgage Payable due Feb 1, 2018 [Member]
Years
Jul. 31, 2011
Kilroy Realty, L.P. [Member]
4.80% Unsecured Senior Notes due July 15, 2018 [Member]
Secured and Unsecured Debt of the Operating Partnership (Textuals) (Abstract)               
Principal amount of secured debt      $ 30,000,000      $ 135,000,000$ 325,000,000
Maturity DateApr. 15, 2015Apr. 15, 2012Apr. 15, 2012Nov. 15, 2014Nov. 15, 2014Feb. 01, 2018Jul. 15, 2018
Stated coupon rate 3.25%   3.25%4.94%3.25%[1]3.25%[1]4.25%[2]4.25%[2]  4.27%4.80%
Debt Amortization Period in Number of Years      30      30 
Number of Buildings9 4            
Debt premium      1,000,000        
Debt discount       1,714,0004,004,00013,671,00016,532,000   505,000
Debt Instrument, Interest Rate, Effective Percentage      4.00%5.45%[3]5.45%[3]7.13%[3]7.13%[3]   4.83%
Average Trading Price Of The Companys Stock$ 37.92              
Debt Instrument, Convertible, Conversion Price       $ 88[4]$ 88[4]$ 35.93[4]$ 35.93[4]    
Fair value of the shares upon conversion if Exchangeable Notes were converted on specified date         180,400,000     
Principal amount   1,776,900,000[5]   148,000,000148,000,000172,500,000172,500,000    
Amount by which fair value of the shares upon conversion exceeds principal amount of the Exchangeable Notes on the specified date         7,900,000     
Additional line of credit under Credit Facility   200,000,000           
Credit facility spread   1.75%2.675%          
Amount Incurred In Debt Origination And Legal Costs           $ 3,300,000$ 5,000,000  
Line of Credit Facility Maturity Extension   1 year1 year          
[1]Interest on the 3.25% Exchangeable Notes is payable semi-annually in arrears on April 15th and October 15th of each year.
[2]Interest on the 4.25% Exchangeable Notes is payable semi-annually in arrears on May 15th and November 15th of each year.
[3]The rate at which we record interest expense for financial reporting purposes, which reflects the amortization of the discounts on the Exchangeable Notes. This rate represents our conventional debt borrowing rate at the date of issuance.
[4]The exchange rate, exchange price, and the number of shares to be delivered upon conversion are subject to adjustment under certain circumstances including increases in our common dividends.
[5]Includes gross principal balance of outstanding debt before impact of all debt discounts and premiums.