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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
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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)

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- 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. + Details
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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 + Details
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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 + Details
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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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- 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 + Details
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