FAIR VALUE MEASUREMENTS - Fair value measurements on recurring and nonrecurring valuation techniques (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Discount rate | Employment Agreement Award
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value assumptions measurement rate	11.50%	10.00%
Discount rate | Redeemable non-controlling interests
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value assumptions measurement rate	20.50%	12.50%
Operating profit margin range | Employment Agreement Award | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value assumptions measurement rate	27.00%	35.00%
Operating profit margin range | Employment Agreement Award | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value assumptions measurement rate	34.40%	42.30%
Operating profit margin range | Redeemable non-controlling interests | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value assumptions measurement rate	30.90%	24.50%
Operating profit margin range | Redeemable non-controlling interests | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value assumptions measurement rate	34.00%	31.90%
Revenue growth rate range | Employment Agreement Award | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value assumptions measurement rate	(12.20%)	(2.10%)
Revenue growth rate range | Employment Agreement Award | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value assumptions measurement rate	1.90%	2.50%
Revenue growth rate range | Redeemable non-controlling interests | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value assumptions measurement rate	(5.10%)	1.20%
Revenue growth rate range | Redeemable non-controlling interests | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value assumptions measurement rate	19.70%	16.50%
Average recurring EBITDA multiple | Employment Agreement Award
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value assumptions measurement rate	450.00%
Average recurring EBITDA multiple | Employment Agreement Award | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value assumptions measurement rate		6.30%
Average recurring EBITDA multiple | Employment Agreement Award | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value assumptions measurement rate		6.50%
Exit multiple | Redeemable non-controlling interests
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value assumptions measurement rate	400.00%	400.00%