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FAIR VALUE MEASUREMENTS - Fair value measurements on recurring and nonrecurring valuation techniques (Details) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2025 | Dec. 31, 2024
Discount rate | Employment Agreement Award |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant Unobservable Input Value | 11.50% | 11.50%
Discount rate | Redeemable Non-controlling Interests |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant Unobservable Input Value | 15.50% | 20.50%
Operating profit margin range | Employment Agreement Award | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant Unobservable Input Value | 20.00% | 27.00%
Operating profit margin range | Employment Agreement Award | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant Unobservable Input Value | 38.10% | 34.40%
Operating profit margin range | Redeemable Non-controlling Interests | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant Unobservable Input Value | 6.80% | 30.90%
Operating profit margin range | Redeemable Non-controlling Interests | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant Unobservable Input Value | 21.70% | 34.00%
Revenue growth rate range | Employment Agreement Award | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant Unobservable Input Value | (7.80%) | (12.20%)
Revenue growth rate range | Employment Agreement Award | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant Unobservable Input Value | (2.00%) | 1.90%
Revenue growth rate range | Redeemable Non-controlling Interests | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant Unobservable Input Value | (0.50%) | (5.10%)
Revenue growth rate range | Redeemable Non-controlling Interests | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant Unobservable Input Value | 24.30% | 19.70%
Average recurring EBITDA multiple | Employment Agreement Award |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant Unobservable Input Value |  | 450.00%
Average recurring EBITDA multiple | Employment Agreement Award | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant Unobservable Input Value | 4.00% |
Average recurring EBITDA multiple | Employment Agreement Award | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant Unobservable Input Value | 4.50% |
EBITDA Exit multiple | Redeemable Non-controlling Interests |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant Unobservable Input Value |  | 4.00%

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