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Equity-Based Compensation - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Feb. 17, 2025 | Mar. 31, 2025 | Mar. 31, 2024 | Jul. 25, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Equity-based compensation expense |  | $ 37,909 | $ 1,113 |
2024 Equity Incentive Plan |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Unrecognized equity-based compensation cost, weighted-average remaining service period |  | 3 years 3 months 18 days |  |
Unrecognized equity-based compensation expense |  | $ 14,200 |  |
2019 Common Unit Option Plan |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Unrecognized equity-based compensation cost, weighted-average remaining service period |  | 2 years 4 months 24 days |  |
Unrecognized equity-based compensation expense |  | $ 73,500 |  |
2024 Employee Stock Purchase Plan |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Consecutive offering periods |  | The Company’s board of directors amended and restated the ESPP in January 2025 to provide for consecutive offering periods lasting approximately 24 months, and consisting of four purchase periods of approximately six months. An offering period generally starts on the first trading day on or after May 15 and November 15 of each year and ends on the last trading day of the applicable 24-month period. The initial offering period under the ESPP commenced on February 17, 2025 and will extend through the first trading day on or after May 15, 2027. |  |
Offering period |  | 24 months |  |
Percentage of employees eligible compensation | 0.15 |  |  |
Maximum number of shares per employee | 3,000 |  |  |
Unrecognized equity-based compensation cost |  | $ 4,700 |  |
Unrecognized equity-based compensation cost, weighted-average remaining service period |  | 2 years 1 month 6 days |  |
Share-based payment arrangement accrued contributions |  | $ 500 |  |
Percentage of number of shares of capital stock outstanding on last day of preceding year |  | 1.00% |  |
Class A common stock | 2024 Employee Stock Purchase Plan |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Percentage purchase price of shares equal to fair market value | 85.00% |  |  |
Common stock reserved for future issuance |  | 5,400,000 |  |
Class A common stock | 2024 Employee Stock Purchase Plan | Initial Public Offering | OneStream Software LLC |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Common stock reserved for future issuance |  |  |  | 10,700,000
Performance-based Shares | DataSense |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Unrecognized equity-based compensation cost |  | $ 8,200 |  |
Unrecognized equity-based compensation cost, weighted-average remaining service period |  | 1 year 4 months 24 days |  |
Equity-based compensation expense |  | $ 2,400 |  |
RSUs |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Unrecognized equity-based compensation cost |  | $ 129,700 |  |
Unrecognized equity-based compensation cost, weighted-average remaining service period |  | 4 years |  |
Equity-based compensation expense |  | $ 2,400 |  |

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