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v3.20.4

Noncontrolling Interests on the Company’s Consolidated Financial Statements - Narrative (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) d $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 shares
Noncontrolling Interest [Line Items] |  |  |
Conversion ratio | 1 |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.01 | $ 0.01 |
Trading days | d | 10 |  |
Aggregate value upon redemption of outstanding noncontrolling common units | $ 65,400 | $ 167,700 |
Noncontrolling interest in consolidated subsidiary | $ 197,503 | $ 195,431 |
Common units [Member] | Kilroy Realty L.P. [Member] |  |  |
Noncontrolling Interest [Line Items] |  |  |
Common units outstanding held by common limited partners (in units) | shares | 1,150,574 | 2,023,287 |
Conversion ratio | 1 |  |
Common Stock [Member] |  |  |
Noncontrolling Interest [Line Items] |  |  |
Exchange of common units of the Operating Partnership (in units) | shares | 872,713 | 2,000 | 51,906
Operating Partnership [Member] |  |  |
Noncontrolling Interest [Line Items] |  |  |
Ownership interest | 99.00% | 98.10% |
Non-affiliated Investors and Certain Executive Officersand Directors of the Company [Member] |  |  |
Noncontrolling Interest [Line Items] |  |  |
Ownership interest of noncontrolling interest | 1.00% | 1.90% |
101 First LLC and 303 Second LLC [Member] |  |  |
Noncontrolling Interest [Line Items] |  |  |
Ownership interest | 56.00% |  |
101 First LLC and 303 Second LLC [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Noncontrolling Interest [Line Items] |  |  |
Noncontrolling interest in consolidated subsidiary | $ 191,900 | $ 189,600 |
Redwood LLC [Member] |  |  |
Noncontrolling Interest [Line Items] |  |  |
Ownership interest | 93.00% |  |
Noncontrolling interest in consolidated subsidiary | $ 5,600 | $ 5,800 |

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