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Debt Maturities (Details) (Debt [Member], Kilroy Realty, L.P. [Member], USD $)
Mar. 31, 2015
Debt [Member] | Kilroy Realty, L.P. [Member]
 
Stated debt maturities and scheduled amortization payments, excluding debt discounts  
Remaining 2015 $ 366,630,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_DebtMember
2016 99,431,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_DebtMember
2017 71,748,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_DebtMember
2018 451,728,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_DebtMember
2019 395,369,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_DebtMember
Thereafter 1,041,644,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_DebtMember
Total 2,426,550,000us-gaap_DebtInstrumentCarryingAmount
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_DebtMember
[1]
Unamortized premium $ (3,500,000)us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_DebtMember
[1] Includes gross principal balance of outstanding debt before impact of net unamortized premiums totaling approximately $3.5 million