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v3.20.4

Partners' Capital of the Operating Partnership - At-The-Market Stock Offering, Common Units and Accrued Distributions (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |
Aggregate net proceeds after selling commissions | $ 721,665 | $ 353,722 | $ 130,693
Accrued distributions |  |  |
Accrued dividends and distributions | 59,431 | 53,219 |
Common units [Member] |  |  |
Accrued distributions |  |  |
Accrued dividends and distributions | $ 575 | 981 |
Issuance of Equity under ATM Program [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares of common stock contributed by the Company (in shares) | 3,147,110 |  | 1,817,195
Common units exchanged for shares of common stock by the Company (in units) | 3,147,110 |  | 1,817,195
Aggregate gross proceeds | $ 252,000 |  | $ 133,800
Aggregate net proceeds after selling commissions | 247,300 |  | 132,100
Kilroy Realty L.P. [Member] |  |  |
Class of Stock [Line Items] |  |  |
Aggregate net proceeds after selling commissions | 721,665 | 353,722 | $ 130,693
Accrued distributions |  |  |
Accrued dividends and distributions | 59,431 | 53,219 |
Kilroy Realty L.P. [Member] | Restricted Stock Units (RSUs) [Member] |  |  |
Accrued distributions |  |  |
Accrued dividends and distributions | $ 838 | $ 820 |
RSUs (in shares) | 1,638,026 | 1,651,905 |
Kilroy Realty L.P. [Member] | Market measure-based Restricted Stock Units (RSUs) [Member] |  |  |
Accrued distributions |  |  |
Number of RSUs outstanding (in shares) | 873,709 | 932,675 |
Kilroy Realty L.P. [Member] | Partners Capital Common Unit [Member] |  |  |
Accrued distributions |  |  |
Accrued dividends and distributions | $ 59,431 | $ 53,219 |
Kilroy Realty L.P. [Member] | Partners capital general partner [Member] |  |  |
Accrued distributions |  |  |
Accrued dividends and distributions | 58,018 | 51,418 |
Kilroy Realty L.P. [Member] | Partners capital limited partner [Member] |  |  |
Accrued distributions |  |  |
Accrued dividends and distributions | $ 575 | $ 981 |
Kilroy Realty L.P. [Member] | Common units [Member] |  |  |
Summary of units |  |  |
Company owned common units in the Operating Partnership (in units) | 116,035,827 | 106,016,287 |
Noncontrolling common units (in units) | 1,150,574 | 2,023,287 |
Operating Partnership [Member] |  |  |
Summary of units |  |  |
Company owned general partnership interest | 99.00% | 98.10% |
Operating Partnership [Member] | Non-Affiliated Investors [Member] |  |  |
Summary of units |  |  |
Ownership interest of noncontrolling interest | 1.00% | 1.90% |

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