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RELATED PARTY TRANSACTIONS - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 30, 2024
Dec. 29, 2024
Sep. 30, 2023
Related Party Transaction [Line Items]                  
Incurred Costs Related To Aviation Policy     $ 500,000 $ 300,000 $ 1,200,000        
Galaxy Digital Holdings, LP                  
Related Party Transaction [Line Items]                  
Distributions $ 9,436,000 $ 36,698,000 55,258,000 22,405,000 184,275,000        
General and administrative 86,575,000 19,685,000 279,297,000 58,351,000 148,770,000        
Financial guarantee 0 0 0 0 $ 0        
Interest $ 27,169,000   $ 15,530,000 $ 4,595,000          
Options, grants in period (in shares) 4,172,899   2,913,051 10,963,780 1,565,000        
Stock-based compensation $ 13,738,000 $ 18,520,000 $ 75,017,000 $ 83,790,000 $ 89,860,000        
Galaxy Digital Holdings, LP | Restricted Stock (Restricted Stock, Restricted Stock Units and Deferred Share Units)                  
Related Party Transaction [Line Items]                  
Granted / transferred (in shares) 1,898,442 3,439,035 3,439,035 4,983,339 6,718,554        
Galaxy Interactive Fund I, LP                  
Related Party Transaction [Line Items]                  
Fair value of investments $ 1,000,000   $ 1,000,000 $ 2,400,000          
Related Party | Galaxy Digital Holdings, LP                  
Related Party Transaction [Line Items]                  
Related party transaction, amounts of transaction     41,686,000 45,840,000 $ 31,185,000        
Distributions 9,400,000 $ 36,700,000 55,300,000 22,400,000 184,300,000        
Fair value of investments 13,100,000   12,900,000 11,000,000.0          
General and administrative 900,000 500,000 3,200,000 2,200,000 2,500,000        
Accounts payable 107,800,000   95,800,000 66,000,000.0          
Advisory fees 600,000 500,000 2,100,000 900,000 1,000,000        
Use of food and beverage consumption fees     20,000.00 100,000          
GGI fees 400,000   400,000            
Options, grants in period (in shares)           500,000      
Stock-based compensation 0 3,000,000 5,000,000.0 11,900,000 11,600,000        
Tax payments 4,800,000 4,800,000 4,800,000 2,900,000          
Indemnification payments amount       4,900,000          
Related Party | Galaxy Digital Holdings, LP | Restricted Stock (Restricted Stock, Restricted Stock Units and Deferred Share Units)                  
Related Party Transaction [Line Items]                  
Granted / transferred (in shares)           1,500,000      
Related Party | Directors | Galaxy Digital Holdings, LP                  
Related Party Transaction [Line Items]                  
Related party transaction, amounts of transaction     700,000 800,000 $ 800,000        
Related Party | Promissory Note | Galaxy Digital Holdings, LP                  
Related Party Transaction [Line Items]                  
Debt instrument, interest rate, effective percentage             7.00% 9.00% 7.00%
Promissory note 109,000,000   96,900,000 67,200,000          
Interest 2,200,000   0 0          
Related Party | Candy Digital Inc | Galaxy Digital Holdings, LP                  
Related Party Transaction [Line Items]                  
Fair value of investments 8,800,000   9,100,000 18,000,000.0          
Related Party | GDH Ltd | Galaxy Digital Holdings, LP                  
Related Party Transaction [Line Items]                  
Consulting agreement, expense $ 0 $ 200,000 $ 1,000,000.0 $ 1,000,000.0