FAIR VALUE MEASUREMENTS - Fair value measurements on recurring and nonrecurring valuation techniques (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Discount rate | Employment Agreement Award
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Significant Unobservable Input Value(a)	11.50%	11.50%
Discount rate | Employment Agreement Award | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Significant Unobservable Input Value(a)	(11.60%)	(12.20%)
Discount rate | Employment Agreement Award | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Significant Unobservable Input Value(a)	1.90%	1.90%
Discount rate | Redeemable Non-controlling Interests
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Significant Unobservable Input Value(a)	20.50%	20.50%
Operating profit margin range | Employment Agreement Award | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Significant Unobservable Input Value(a)	27.10%	27.00%
Operating profit margin range | Employment Agreement Award | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Significant Unobservable Input Value(a)	34.40%	34.40%
Operating profit margin range | Redeemable Non-controlling Interests | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Significant Unobservable Input Value(a)	30.90%	30.90%
Operating profit margin range | Redeemable Non-controlling Interests | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Significant Unobservable Input Value(a)	34.00%	34.00%
Average recurring EBITDA multiple | Employment Agreement Award
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Significant Unobservable Input Value(a)		450.00%
Average recurring EBITDA multiple | Employment Agreement Award | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Significant Unobservable Input Value(a)	4.50%
Average recurring EBITDA multiple | Employment Agreement Award | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Significant Unobservable Input Value(a)	5.00%
Revenue growth rate range | Redeemable Non-controlling Interests | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Significant Unobservable Input Value(a)	(5.10%)	(5.10%)
Revenue growth rate range | Redeemable Non-controlling Interests | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Significant Unobservable Input Value(a)	19.70%	19.70%
EBITDA Exit multiple | Redeemable Non-controlling Interests
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Significant Unobservable Input Value(a)	4.00%	4.00%