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Stockholders' Equity of the Company - At-The-Market Offering and Derivatives and Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Dividends Payable [Line Items] |  |  |
Aggregate net proceeds after selling commissions | $ 0 | $ 721,665 | $ 353,722
Accrued dividend and distributions |  |  |
Accrued dividends and distributions | $ 61,850 | $ 59,431 |
Summary of shares and units |  |  |
Common stock | 116,464,169 | 116,035,827 |
Restricted Stock Units (RSUs) |  |  |
Summary of shares and units |  |  |
RSUs | 1,292,802 | 1,638,026 |
Common stockholders and noncontrolling unitholders |  |  |
Accrued dividend and distributions |  |  |
Accrued dividends and distributions | $ 61,850 | $ 59,431 |
Common Stock |  |  |
Accrued dividend and distributions |  |  |
Accrued dividends and distributions | $ 60,561 | $ 58,018 |
Summary of shares and units |  |  |
Common stock | 116,464,169 | 116,035,827 |
Noncontrolling common unitholders of the Operating Partnership |  |  |
Accrued dividend and distributions |  |  |
Accrued dividends and distributions | $ 598 | $ 575 |
Issuance of Equity under ATM Program |  |  |
Dividends Payable [Line Items] |  |  |
Shares of common stock sold during the period (in shares) |  | 3,147,110 |
Weighted average price per share of common stock (in dollars per share) |  | $ 80.08 |
Aggregate gross proceeds |  | $ 252,000 |
Aggregate net proceeds after selling commissions |  | 247,300 |
Kilroy Realty L.P. |  |  |
Dividends Payable [Line Items] |  |  |
Aggregate net proceeds after selling commissions | 0 | 721,665 | $ 353,722
Accrued dividend and distributions |  |  |
Accrued dividends and distributions | 61,850 | 59,431 |
Kilroy Realty L.P. | Restricted Stock Units (RSUs) |  |  |
Accrued dividend and distributions |  |  |
Accrued dividends and distributions | $ 691 | $ 838 |
Kilroy Realty L.P. | Market measure-based Restricted Stock Units (RSUs) |  |  |
Summary of shares and units |  |  |
Number of RSUs outstanding (in shares) | 976,464 | 873,709 |

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