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Stock-Based Compensation - Narrative (Details) - USD ($) |  | 3 Months Ended | 8 Months Ended | 9 Months Ended |  |  |
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Sep. 11, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 10, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 12, 2025 | Jun. 30, 2025 | Dec. 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Cumulative compensation cost | $ 100,000 |  |  |  |  |  |  |  |
Share-based compensation expense |  | $ 45,600,000 | $ 1,300,000 |  | $ 48,800,000 | $ 4,500,000 |  |  |
Class A common stock |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share available for future issuance (in shares) |  | 12,972,329 |  |  | 12,972,329 |  |  |  |
Class A common stock | IPO |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share price per share (in dollars per share) | $ 28.00 |  |  |  |  |  |  |  |
RSUs |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Awards granted (in shares) | 4,399,544 |  |  |  |  |  |  |  |
Service-Based Incentive Units |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Units vested and outstanding (in shares) | 36,837,700 |  |  |  |  |  |  |  |
Unvested units (in shares) | 14,415,951 |  |  | 14,415,000 |  |  |  |  | 2,729,000
Vesting period |  |  |  |  | 4 years |  |  |  |
Units outstanding (in shares) |  | 0 |  |  | 0 |  |  |  | 34,673,621
Awards granted (in shares) |  |  |  | 18,731,000 |  |  |  |  |
Awards forfeited (in shares) |  |  |  | 1,769,000 |  |  |  |  |
Service-Based Incentive Units | Class A common stock |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Units exchanged (in shares) | 4,699,140 |  |  |  |  |  |  |  |
RSAs |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unvested units (in shares) |  | 4,200,000 |  |  | 4,200,000 |  |  |  | 0
Units outstanding (in shares) |  | 4,399,544 |  |  | 4,399,544 |  |  |  | 0
Awards forfeited (in shares) |  |  |  |  | 0 |  |  |  |
Remaining unrecognized expense |  | $ 8,300,000 |  |  | $ 8,300,000 |  |  |  |
Weighted-average recognition period for unrecognized compensation expense |  |  |  |  | 1 year 8 months 12 days |  |  |  |
RSAs | Minimum |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period | 2 years |  |  |  |  |  |  |  |
RSAs | Maximum |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period | 4 years |  |  |  |  |  |  |  |
RSAs | Service-Based Incentive Units |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Units converted (in shares) | 3,815,917 |  |  |  |  |  |  |  |
RSAs | Phantom Units |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Units converted (in shares) | 567,756 |  |  |  |  |  |  |  |
RSAs | Original Phantom Units |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Units converted (in shares) | 15,871 |  |  |  |  |  |  |  |
Performance Based Incentive Units |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Units vested and outstanding (in shares) | 677,750 | 0 |  |  | 0 |  |  |  | 677,750
Awards granted (in shares) |  |  |  |  | 0 |  |  |  |
Awards forfeited (in shares) |  |  |  |  | 0 |  |  |  |
Performance Based Incentive Units | Class A common stock |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Units exchanged (in shares) | 141,004 |  |  |  |  |  |  |  |
Phantom Units |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Units vested and outstanding (in shares) | 658,494 |  |  |  |  |  |  |  |
Unvested units (in shares) | 2,101,173 |  |  | 2,101,000 |  |  |  |  | 376,000
Units outstanding (in shares) |  | 0 |  |  | 0 |  |  |  | 406,600
Awards granted (in shares) |  |  |  | 2,508,000 |  |  |  |  |
Awards forfeited (in shares) |  |  |  | 154,000 |  |  |  |  |
Phantom Units | Class A common stock |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Units exchanged (in shares) | 179,113 |  |  |  |  |  |  |  |
Service Based Common Units |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Units vested and outstanding (in shares) | 1,050,270 | 0 |  |  | 0 |  |  |  | 553,867
Awards granted (in shares) |  |  |  |  | 0 |  |  |  |
Awards forfeited (in shares) |  |  |  |  | 0 |  |  |  |
Service Based Common Units | Class A common stock |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Units exchanged (in shares) | 321,219 |  |  |  |  |  |  |  |
Original Phantom Units |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Units vested and outstanding (in shares) | 384,312 |  |  |  |  |  |  |  |
Unvested units (in shares) | 94,973 |  |  |  |  |  |  |  |
Units outstanding (in shares) |  | 0 |  |  | 0 |  |  |  | 755,729
Liability recognized as service conditions were considered probable |  |  |  |  |  |  |  |  | $ 1,300,000
Remaining unrecognized expense | $ 100,000 |  |  |  |  |  |  |  |
Original Phantom Units | Class A common stock |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Units exchanged (in shares) | 64,144 |  |  |  |  |  |  |  |
ESPP |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share available for future issuance (in shares) |  |  |  |  |  |  | 7,383,241 |  |
Shares purchased (in shares) |  |  |  |  | 0 |  |  |  |
Share-based compensation expense |  | $ 0 |  |  | $ 0 |  |  |  |
RSUs and Options | Class A common stock |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share available for future issuance (in shares) |  | 12,130,692 |  |  | 12,130,692 |  |  |  |
RSUs |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unvested units (in shares) |  | 3,888,000 |  |  | 3,888,000 |  |  |  | 0
Units outstanding (in shares) |  | 5,269,529 |  |  | 5,269,529 |  |  |  | 0
Awards granted (in shares) |  |  |  |  | 5,270,000 |  |  |  |
Awards forfeited (in shares) |  |  |  |  | 0 |  |  |  |
Remaining unrecognized expense |  | $ 106,100,000 |  |  | $ 106,100,000 |  |  |  |
Annual bonus arrangement |  |  |  |  |  |  |  | $ 15,100,000 |
Equity awards issued, vested and outstanding | 538,612 |  |  |  |  |  |  |  |
Weighted-average recognition period for unrecognized compensation expense |  |  |  |  | 3 years 2 months 12 days |  |  |  |
RSUs | Class A common stock | Executive Officers, Other Employees And Board Members |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share available for future issuance (in shares) |  | 5,283,088 |  |  | 5,283,088 |  |  |  |
RSUs | Common Class A, Unvested Incentive Units |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share available for future issuance (in shares) | 4,730,917 |  |  |  |  |  |  |  |
Outstanding stock options | Class A common stock | Founders And Executive Officers |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share available for future issuance (in shares) |  | 6,847,604 |  |  | 6,847,604 |  |  |  |
Time Based Stock Options |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Remaining unrecognized expense |  | $ 8,700,000 |  |  | $ 8,700,000 |  |  |  |
Weighted-average recognition period for unrecognized compensation expense |  |  |  |  | 3 years 10 months 24 days |  |  |  |
Expected dividend yield |  |  |  |  | 0.00% |  |  |  |
Time Based Stock Options | Class A common stock |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share available for future issuance (in shares) |  | 482,142 |  |  | 482,142 |  |  |  |
Market Based Stock Options |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Remaining unrecognized expense |  | $ 122,500,000 |  |  | $ 122,500,000 |  |  |  |
Expected dividend yield |  |  |  |  | 0.00% |  |  |  |
Market Based Stock Options | Class A common stock |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share available for future issuance (in shares) |  | 6,365,462 |  |  | 6,365,462 |  |  |  |

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