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Noncontrolling Interests on the Company's Consolidated Financial Statements (Details) $ / shares in Units, $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 USD ($) trading_day $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares
Noncontrolling Interest [Line Items] |  |
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 | $ | $ 45.4 | $ 47.0
Non-Affiliated Investors and Former Executive Officer and Director | Common Units |  |
Noncontrolling Interest [Line Items] |  |
Common units outstanding held by common limited partners (in shares) | 1,150,574 | 1,150,574
Kilroy Realty L.P. | Common Units |  |
Noncontrolling Interest [Line Items] |  |
Conversion ratio | 1 |
Kilroy Realty L.P. | Common Units |  |
Noncontrolling Interest [Line Items] |  |
Common units outstanding held by common limited partners (in shares) | 1,150,574 | 1,150,574
Operating Partnership |  |
Noncontrolling Interest [Line Items] |  |
Ownership interest (percent) | 99.00% | 99.00%
Operating Partnership | Non-Affiliated Investors and Former Executive Officer and Director |  |
Noncontrolling Interest [Line Items] |  |
Ownership interest (percent) | 1.00% | 1.00%

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