SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair value measurements on recurring and nonrecurring valuation techniques (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Discount rate
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Debt Securities, Available-for-Sale, Measurement Input		10.5
Discount rate | Employment agreement award
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Assumptions Measurement Rate	10.50%	9.50%
Discount rate | Redeemable Noncontrolling Interest [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Assumptions Measurement Rate	11.50%	11.50%
Discount rate | Minimum | Redeemable Noncontrolling Interest [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Assumptions Measurement Rate	25.80%	24.00%
Discount rate | Maximum | Redeemable Noncontrolling Interest [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Assumptions Measurement Rate	29.80%	32.80%
Terminal growth rate
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Debt Securities, Available-for-Sale, Measurement Input		3.0
Terminal growth rate | Employment agreement award
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Assumptions Measurement Rate	0.50%	0.50%
Terminal growth rate | Redeemable Noncontrolling Interest [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Assumptions Measurement Rate	0.30%	0.40%
Operating profit margin range | Minimum | Employment agreement award
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Assumptions Measurement Rate	33.70%	34.90%
Operating profit margin range | Maximum | Employment agreement award
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Assumptions Measurement Rate	46.60%	46.40%
Revenue growth rate range | Minimum | Employment agreement award
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Assumptions Measurement Rate	(4.10%)	(5.90%)
Revenue growth rate range | Minimum | Redeemable Noncontrolling Interest [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Assumptions Measurement Rate	0.20%	(11.80%)
Revenue growth rate range | Maximum | Employment agreement award
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Assumptions Measurement Rate	4.20%	11.60%
Revenue growth rate range | Maximum | Redeemable Noncontrolling Interest [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Assumptions Measurement Rate	32.20%	0.30%