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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of fair value measurement of level 3 financial assets and liabilities (Details) - Significant unobservable inputs (Level 3) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Mandatorily redeemable noncontrolling interests issued after November 5, 2003
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at beginning of period	$ 5,835	$ 4,648
Fair Value Adjustments	0	0
Relating to Undistributed Earnings	293	308
Purchases, Sales and Settlements	(527)	(302)
Transfer in and/or out of Level 3	0	0
Balance at end of period	5,601	4,654
Contingent consideration
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at beginning of period	27,985	31,046
Fair Value Adjustments	1,407	(3,447)
Relating to Undistributed Earnings	0	0
Purchases, Sales and Settlements	(70)	1,285
Transfer in and/or out of Level 3	0	0
Balance at end of period	29,322	28,884
Loans receivable at fair value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	532,419	701,652
Fair Value Adjustments	(12,130)	43,459
Relating to Undistributed Earnings	3,089	231
Purchases, Sales and Settlements	(70,882)	26,743
Transfer in and/or out of Level 3	0	0
Balance at end of period	452,496	772,085
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	735,638	368,465
Fair Value Adjustments	(51,009)	(9,016)
Relating to Undistributed Earnings	12	0
Purchases, Sales and Settlements	(8,888)	6,487
Transfer in and/or out of Level 3	(1,074)	(6,895)
Balance at end of period	674,679	359,041
Trading income (loss) and fair value adjustments | Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Adjustments	(10,390)	(12)
Realized and unrealized gains (losses) on investments | Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Adjustments	$ (40,619)	$ (9,004)

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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- Definition

Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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- Definition

Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

+ References

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-Topic 820
-SubTopic 10
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Amount of gain (loss) recognized in other comprehensive income (OCI) from liability measured at fair value on recurring basis using unobservable input (level 3).

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Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy.

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