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Noncontrolling Interests on the Company’s Consolidated Financial Statements - Narrative (Details) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) trading_day $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Aug. 30, 2016
Noncontrolling Interest [Line Items] |  |  |
Conversion ratio | 1 |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.01 | $ 0.01 |
Number of trading days | trading_day | 10 |  |
Aggregate value upon redemption of outstanding noncontrolling common units | $ 76,200 | $ 65,400 |
Noncontrolling interest in consolidated subsidiary | $ 196,064 | $ 197,503 |
Non-Affiliated Investors | Capital Units |  |  |
Noncontrolling Interest [Line Items] |  |  |
Common units outstanding held by common limited partners (in shares) | shares | 1,150,574 | 1,150,574 |
Kilroy Realty L.P. | Capital Units |  |  |
Noncontrolling Interest [Line Items] |  |  |
Common units outstanding held by common limited partners (in shares) | shares | 1,150,574 | 1,150,574 |
Capital Units | Kilroy Realty L.P. |  |  |
Noncontrolling Interest [Line Items] |  |  |
Conversion ratio | 1 |  |
Operating Partnership |  |  |
Noncontrolling Interest [Line Items] |  |  |
Ownership interest (percent) | 99.00% | 99.00% |
Operating Partnership | Non-Affiliated Investors |  |  |
Noncontrolling Interest [Line Items] |  |  |
Ownership interest (percent) | 1.00% | 1.00% |
Norges Bank Real Estate Management (NBREM) | Consolidated property partnerships |  |  |
Noncontrolling Interest [Line Items] |  |  |
Ownership interest of noncontrolling interest |  |  | 44.00%
101 First LLC and 303 Second LLC | Variable Interest Entity, Primary Beneficiary |  |  |
Noncontrolling Interest [Line Items] |  |  |
Noncontrolling interest in consolidated subsidiary | $ 190,700 | $ 191,900 |
Redwood LLC |  |  |
Noncontrolling Interest [Line Items] |  |  |
Noncontrolling interest in consolidated subsidiary | $ 5,400 | $ 5,600 |

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