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v3.20.4

Secured and Unsecured Debt of the Operating Partnership - Unsecured Senior Notes - Registered Offerings and Private Placement (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 31, 2020 | Apr. 30, 2020 | Sep. 30, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of unsecured debt |  | $ 772,297,000 | $ 499,390,000 | $ 648,537,000 |  |  |
Loss on early extinguishment of debt (Note 9) |  | 0 | 0 | 12,623,000 |  |  |
Unsecured debt [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unamortized discount (premium), net |  | (8,300,000) | (6,500,000) |  |  |  |
Kilroy Realty L.P. [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of unsecured debt |  | 772,297,000 | 499,390,000 | 648,537,000 |  |  |
Loss on early extinguishment of debt (Note 9) |  | $ 0 | $ 0 | $ 12,623,000 |  |  |
Kilroy Realty L.P. [Member] | Unsecured debt [Member] | 2.500% Unsecured Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 425,000,000.0 |  |
Unamortized discount (premium), net |  |  |  |  | $ (2,700,000) |  |
Stated interest rate |  | 2.50% |  |  |  |  |
Kilroy Realty L.P. [Member] | Unsecured debt [Member] | 3.050% Unsecured Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 500,000,000.0
Unamortized discount (premium), net |  |  |  |  |  |  | $ (600,000)
Stated interest rate |  | 3.05% |  |  |  |  |
Kilroy Realty L.P. [Member] | Unsecured debt [Member] | 4.750% Unsecured Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  | 4.75% |  |  |  |  |
Kilroy Realty L.P. [Member] | Unsecured debt [Member] | 6.625% Unsecured Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate | 6.625% |  |  | 6.625% |  |  |
Extinguishment of debt | $ 250,000,000.0 |  |  |  |  |  |
Loss on early extinguishment of debt (Note 9) | 12,600,000 |  |  |  |  |  |
Premium paid to the note holders at the redemption date | 11,800,000 |  |  |  |  |  |
Write-off of unamortized discount and unamortized deferred financing costs | $ 800,000 |  |  |  |  |  |
Kilroy Realty L.P. [Member] | Unsecured debt [Member] | 4.270% Unsecured Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 350,000,000.0 |
Stated interest rate |  | 4.27% |  |  |  |  |

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