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Exhangeable Senior Notes (Details) (Term Loan Facility [Member], Line of Credit [Member], Kilroy Realty, L.P. [Member])
 3 Months Ended
Mar. 31, 2014
Term Loan Facility [Member] | Line of Credit [Member] | Kilroy Realty, L.P. [Member]
  
Debt Instrument [Line Items]  
Debt Instrument, Basis Spread on Variable Rate 1.56%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= krc_OneHundredFiftyMillionTermLoanFacilityMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		 [1]
[1] Our unsecured term loan facility interest rate was calculated based on an annual rate of LIBOR plus 1.40%.