Cover Page - USD ($)
12 Months Ended
Dec. 31, 2019
Feb. 07, 2020
Jun. 30, 2019
Entity Information [Line Items]   
Document Type10-K  
Document Annual Reporttrue  
Document Period End DateDec. 31, 2019  
Document Transition Reportfalse  
Entity File Number1-12675  
Entity Registrant NameKILROY REALTY CORPORATION  
Entity Central Index Key0001025996  
Current Fiscal Year End Date--12-31  
Document Fiscal Year Focus2019  
Document Fiscal Period FocusFY  
Amendment Flagfalse  
Entity Incorporation, State or Country CodeMD  
Entity Tax Identification Number95-4598246  
Entity Address, Address Line One12200 W. Olympic Boulevard  
Entity Address, Address Line TwoSuite 200  
Entity Address, City or TownLos Angeles  
Entity Address, State or ProvinceCA  
Entity Address, Postal Zip Code90064  
City Area Code(310)  
Local Phone Number481-8400  
Title of 12(b) SecurityCommon Stock, $.01 par value  
Security Exchange NameNYSE  
Trading SymbolKRC  
Entity Well-known Seasoned IssuerYes  
Entity Voluntary FilersNo  
Entity Current Reporting StatusYes  
Entity Interactive Data CurrentYes  
Entity Filer CategoryLarge Accelerated Filer  
Entity Small Businessfalse  
Entity Emerging Growth Companyfalse  
Entity Shell Companyfalse  
Entity Public Float  $ 7,416,459,726
Entity Common Stock, Shares Outstanding 106,167,149 
Documents Incorporated by Reference
Portions of the Kilroy Realty Corporation’s Proxy Statement with respect to its 2020 Annual Meeting of Stockholders to be filed not later than 120 days after the end of the registrant’s fiscal year are incorporated by reference into Part III of this Form 10-K.
  
Kilroy Realty L.P. [Member]   
Entity Information [Line Items]   
Entity File Number000-54005  
Entity Registrant NameKILROY REALTY, L.P.   
Entity Central Index Key0001493976  
Current Fiscal Year End Date--12-31  
Document Fiscal Year Focus2019  
Document Fiscal Period FocusFY  
Amendment Flagfalse  
Entity Incorporation, State or Country CodeDE  
Entity Tax Identification Number95-4612685  
Title of 12(g) SecurityCommon Units Representing Limited Partnership Interests  
Entity Well-known Seasoned IssuerYes  
Entity Voluntary FilersNo  
Entity Current Reporting StatusYes  
Entity Interactive Data CurrentYes  
Entity Filer CategoryNon-accelerated Filer  
Entity Small Businessfalse  
Entity Emerging Growth Companyfalse  
Entity Shell Companyfalse  

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