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Secured and Unsecured Debt of the Operating Partnership - Unsecured Senior Notes (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Oct. 31, 2021 | Dec. 31, 2020 | Aug. 31, 2020 | Apr. 30, 2020
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Unsecured debt, net | $ 3,820,383 |  | $ 3,670,099 |  |
2.650% Unsecured Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 2.65% | 2.65% |  |  |
Effective interest rate | 2.654% |  |  |  |
Long-term debt, gross | $ 450,000 | $ 450,000 | 0 |  |
Unamortized discount and deferred financing costs | (4,117) |  | 0 |  |
Unsecured debt, net | 445,883 |  | 0 |  |
Unsecured debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unamortized discount (premium), net | (7,400) |  | (8,300) |  |
Unamortized debt issuance expense | 22,200 |  | 21,600 |  |
Kilroy Realty L.P. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | 4,099,023 |  |  |  |
Unsecured debt, net | 3,820,383 |  | 3,670,099 |  |
Kilroy Realty L.P. | Unsecured debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unsecured debt, net | $ 3,820,383 |  | 3,670,099 |  |
Kilroy Realty L.P. | Unsecured debt | 2.500% Unsecured Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unamortized discount (premium), net |  | $ (200) |  | $ (2,700) |
Stated interest rate |  |  |  | 2.50% |
Effective interest rate | 2.56% |  |  |  |
Long-term debt, gross | $ 425,000 |  | 425,000 |  |
Unamortized discount and deferred financing costs | (5,802) |  | (6,332) |  |
Unsecured debt, net | $ 419,198 |  | 418,668 |  |
Kilroy Realty L.P. | Unsecured debt | 4.270% Unsecured Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 4.27% |  |  |  | 4.27%
Effective interest rate | 4.27% |  |  |  |
Long-term debt, gross | $ 350,000 |  | 350,000 |  |
Unamortized discount and deferred financing costs | (1,644) |  | (1,825) |  |
Unsecured debt, net | $ 348,356 |  | 348,175 |  |
Kilroy Realty L.P. | Unsecured debt | 3.050% Unsecured Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 3.05% |  |  |  |
Effective interest rate | 3.064% |  |  |  |
Long-term debt, gross | $ 500,000 |  | 500,000 |  |
Unamortized discount and deferred financing costs | (4,814) |  | (5,399) |  |
Unsecured debt, net | $ 495,186 |  | 494,601 |  |
Kilroy Realty L.P. | Unsecured debt | 4.750% Unsecured Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 4.75% |  |  |  |
Effective interest rate | 4.80% |  |  |  |
Long-term debt, gross | $ 400,000 |  | 400,000 |  |
Unamortized discount and deferred financing costs | (3,457) |  | (3,952) |  |
Unsecured debt, net | $ 396,543 |  | 396,048 |  |
Kilroy Realty L.P. | Unsecured debt | 4.350% Unsecured Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 4.35% |  |  |  |
Effective interest rate | 4.35% |  |  |  |
Long-term debt, gross | $ 200,000 |  | 200,000 |  |
Unamortized discount and deferred financing costs | (837) |  | (1,012) |  |
Unsecured debt, net | $ 199,163 |  | 198,988 |  |
Kilroy Realty L.P. | Unsecured debt | 4.300% Unsecured Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 4.30% |  |  |  |
Effective interest rate | 4.30% |  |  |  |
Long-term debt, gross | $ 50,000 |  | 50,000 |  |
Unamortized discount and deferred financing costs | (202) |  | (246) |  |
Unsecured debt, net | $ 49,798 |  | 49,754 |  |
Kilroy Realty L.P. | Unsecured debt | 3.450% Unsecured Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 3.45% |  |  |  |
Effective interest rate | 3.47% |  |  |  |
Long-term debt, gross | $ 425,000 |  | 425,000 |  |
Unamortized discount and deferred financing costs | (1,734) |  | (2,321) |  |
Unsecured debt, net | $ 423,266 |  | 422,679 |  |
Kilroy Realty L.P. | Unsecured debt | 3.450% Unsecured Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 3.45% |  |  |  |
Effective interest rate | 3.45% |  |  |  |
Long-term debt, gross | $ 75,000 |  | 75,000 |  |
Unamortized discount and deferred financing costs | (304) |  | (347) |  |
Unsecured debt, net | $ 74,696 |  | 74,653 |  |
Kilroy Realty L.P. | Unsecured debt | 3.350% Unsecured Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 3.35% |  |  |  |
Effective interest rate | 3.35% |  |  |  |
Long-term debt, gross | $ 175,000 |  | 175,000 |  |
Unamortized discount and deferred financing costs | (594) |  | (709) |  |
Unsecured debt, net | $ 174,406 |  | 174,291 |  |
Kilroy Realty L.P. | Unsecured debt | 4.375% Unsecured Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 4.375% |  |  |  |
Effective interest rate | 4.444% |  |  |  |
Long-term debt, gross | $ 400,000 |  | 400,000 |  |
Unamortized discount and deferred financing costs | (2,077) |  | (2,631) |  |
Unsecured debt, net | $ 397,923 |  | 397,369 |  |
Kilroy Realty L.P. | Unsecured debt | 4.250% Unsecured Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 4.25% |  |  |  |
Effective interest rate | 4.35% |  |  |  |
Long-term debt, gross | $ 400,000 |  | 400,000 |  |
Unamortized discount and deferred financing costs | (4,035) |  | (4,567) |  |
Unsecured debt, net | $ 395,965 |  | 395,433 |  |
Kilroy Realty L.P. | Unsecured debt | 3.800% Unsecured Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 3.80% | 3.80% |  |  |
Effective interest rate | 3.80% |  |  |  |
Long-term debt, gross | $ 0 | $ 300,000 | 300,000 |  |
Unamortized discount and deferred financing costs | 0 |  | (560) |  |
Unsecured debt, net | $ 0 |  | $ 299,440 |  |

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