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Noncontrolling Interests - Summary Ownership of Viant Technology LLC (Details) - Viant Technology LLC - shares | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Minority Interest [Line Items] |  |
Units Owned (shares) | 62,403,160 | 63,122,293
Units Owned, Noncontrolling Interest (shares) | 45,754,716 | 46,753,841
Ownership percentage by non-controlling interests | 73.30% | 74.10%
Ownership Percentage | 100.00% | 100.00%
Viant Technology Inc. |  |
Minority Interest [Line Items] |  |
Units Owned (shares) | 16,648,444 | 16,368,452
Ownership percentage by Viant Technology Inc. | 26.70% | 25.90%

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