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BUSINESS COMBINATIONS - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 7 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 01, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Asset Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  | $ 3,437,450 |  | $ 3,437,450 | $ 3,437,450 |  | $ 1,162,636
Compensation and benefits |  | 659,835 | $ 435,876 |  | 1,960,669 | $ 1,268,685 |
Equity-based compensation expense |  | 160,130 | 85,613 |  | 583,083 | 266,267 |
Acquisition costs | $ 68,700 |  |  |  |  |  |
Unvested awards |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |
Equity-based compensation expense |  | $ 157,073 | 85,613 |  | $ 576,039 | 266,267 |
Vested (in shares) |  |  |  |  | 5,158,943 |  |
Remaining nonvested (in shares) |  | 19,972,596 |  | 19,972,596 | 19,972,596 |  | 17,968,940
Cost not yet recognized |  | $ 1,683,500 |  | $ 1,683,500 | $ 1,683,500 |  |
Cost not yet recognized, period for recognition |  |  |  |  | 3 years 4 months 24 days |  |
AOG Unit awards |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |
Equity-based compensation expense |  | $ 3,057 | $ 0 |  | $ 7,044 | $ 0 |
Vested (in shares) |  |  |  |  | 100,000 |  |
Remaining nonvested (in shares) |  | 200,000 |  | 200,000 | 200,000 |  |
Cost not yet recognized |  | $ 29,300 |  | $ 29,300 | $ 29,300 |  |
Cost not yet recognized, period for recognition |  |  |  |  | 2 years 4 months 24 days |  |
GCP International |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |
Business acquisition, measurement period | 1 year |  |  |  |  |  |
Goodwill | $ 2,269,620 |  |  |  |  |  |
Tax deductible amount | $ 1,100,000 |  |  |  |  |  |
Compensation and benefits |  |  |  |  | $ 47,200 |  |
Equity-based compensation expense |  |  |  |  | 110,100 |  |
Acquisition costs |  | 35,300 |  | 35,300 | $ 35,300 |  |
Net income |  |  |  | 253,700 |  |  |
Revenue |  |  |  | 76,400 |  |  |
GCP International | Unvested awards |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |
Vested (in shares) |  |  |  |  | 600,000 |  |
Vested in period, withheld for taxes (in shares) |  |  |  |  | 200,000 |  |
GCP International | Equity Awards |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |
Remaining nonvested (in shares) | 2,300,000 |  |  |  |  |  |
GCP International | AOG Unit awards |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |
Remaining nonvested (in shares) | 200,000 |  |  |  |  |  |
GCP International | Unvested GCP Awards |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |
Equity-based compensation expense |  | 33,500 |  |  | $ 84,600 |  |
Cost not yet recognized |  | $ 337,300 |  | $ 337,300 | $ 337,300 |  |
Cost not yet recognized, period for recognition |  |  |  |  | 3 years |  |
GCP International | Management Contracts |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |
Acquired finite lived intangible assets useful life | 5 years 9 months 18 days |  |  |  |  |  |
GCP International | Client relationships |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |
Acquired finite lived intangible assets useful life | 7 years 7 months 6 days |  |  |  |  |  |

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