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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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Equity securities
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at beginning of period	$ 387,130	$ 333,916	$ 368,465	$ 377,549
Fair Value Adjustments	(11,194)	5,453	(2,923)	(18,594)
Relating to Undistributed Earnings	(47)	0	(35)	0
Purchases, Sales and Settlements	299,763	34	317,168	18,457
Transfer in and/or out of Level 3	(535)	(47)	(7,558)	(38,056)
Balance at end of period	675,117	339,356	675,117	339,356
Equity securities | Trading income (loss) and fair value adjustments
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value Adjustments	(2,347)	4,606	11,573	(732)
Equity securities | Realized and unrealized gains (losses) on investments
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value Adjustments	(8,847)	847	(14,496)	(17,862)
Loans receivable at fair value
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at beginning of period	683,827	770,840	701,652	873,186
Fair Value Adjustments	(859)	(19,158)	51,807	(19,205)
Relating to Undistributed Earnings	1,531	4,181	481	9,554
Purchases, Sales and Settlements	(135,357)	58,852	(204,548)	(7,983)
Transfer in and/or out of Level 3	0	0	(250)	(40,837)
Balance at end of period	549,142	814,715	549,142	814,715
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	4,352	4,160	4,648	4,506
Fair Value Adjustments	0	0	0	0
Relating to Undistributed Earnings	557	356	1,335	824
Purchases, Sales and Settlements	(325)	(194)	(1,399)	(1,008)
Transfer in and/or out of Level 3	0	0	0	0
Balance at end of period	4,584	4,322	4,584	4,322
Contingent consideration
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at beginning of period	27,724	17,722	31,046	0
Fair Value Adjustments	9	620	(4,561)	(3,880)
Relating to Undistributed Earnings	0	0	0	0
Purchases, Sales and Settlements	254	11,236	1,502	33,458
Transfer in and/or out of Level 3	0	0	0	0
Balance at end of period	$ 27,987	$ 29,578	$ 27,987	$ 29,578

X

- Definition

Amount of gain (loss) recognized in income from liability 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 liability 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 a liability 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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-Section 50
-Paragraph 2
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- Definition

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

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- Definition

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+ References

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-Section 50
-Paragraph 2
-Subparagraph (c)
-SubTopic 10
-Topic 820
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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- Definition

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