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Secured and Unsecured Debt of the Operating Partnership - Debt Maturities (Details) - Kilroy Realty L.P. [Member] $ in Thousands | Dec. 31, 2020 USD ($)
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Stated debt maturities and scheduled amortization payments, excluding debt discounts |
2021 | $ 5,342
2022 | 5,554
2023 | 305,775
2024 | 431,006
2025 | 406,246
Thereafter | 2,800,442
Total aggregate principal value | 3,954,365
Unamortized debt issuance expense | (22,400)
Unsecured senior notes [Member] |
Stated debt maturities and scheduled amortization payments, excluding debt discounts |
Debt issuance discount | $ (8,300)

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