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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