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REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of revenues from contracts with customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	$ 397,265	$ 209,712	$ 974,296	$ 589,849
Total revenues	462,312	312,117	1,300,680	698,578
All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	9,928	4,072	28,870	5,382
Total revenues	9,928	4,072	28,870	5,382
Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	76,882	53,409	165,844	158,855
Total revenues	139,566	151,152	487,029	255,292
Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	49,002	46,050	143,696	179,724
Total revenues	51,365	48,172	148,895	188,040
Auction and Liquidation Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	77,605	4,499	93,826	10,342
Total revenues	77,605	7,039	93,826	14,318
Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	37,360	22,835	93,582	73,081
Total revenues	37,360	22,835	93,582	73,081
Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	83,793	73,824	255,668	147,711
Total revenues	83,793	73,824	255,668	147,711
Consumer Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	62,695	5,023	192,810	14,754
Total revenues	62,695	5,023	192,810	14,754
Corporate finance, consulting and investment banking fees
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	91,009	53,644	194,543	163,406
Corporate finance, consulting and investment banking fees | All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Corporate finance, consulting and investment banking fees | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	67,429	41,302	137,305	118,448
Corporate finance, consulting and investment banking fees | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Corporate finance, consulting and investment banking fees | Auction and Liquidation Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Corporate finance, consulting and investment banking fees | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	23,580	12,342	57,238	44,958
Corporate finance, consulting and investment banking fees | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Corporate finance, consulting and investment banking fees | Consumer Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Wealth and asset management fees
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	49,291	47,602	138,972	170,034
Wealth and asset management fees | All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Wealth and asset management fees | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	1,958	3,280	3,880	8,199
Wealth and asset management fees | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	47,333	44,322	135,092	161,835
Wealth and asset management fees | Auction and Liquidation Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Wealth and asset management fees | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Wealth and asset management fees | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Wealth and asset management fees | Consumer Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Commissions, fees and reimbursed expenses
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	35,432	22,997	96,424	86,012
Commissions, fees and reimbursed expenses | All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Commissions, fees and reimbursed expenses | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	7,495	8,827	24,659	32,208
Commissions, fees and reimbursed expenses | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	1,669	1,728	8,604	17,889
Commissions, fees and reimbursed expenses | Auction and Liquidation Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	12,488	1,949	26,817	7,792
Commissions, fees and reimbursed expenses | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	13,780	10,493	36,344	28,123
Commissions, fees and reimbursed expenses | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Commissions, fees and reimbursed expenses | Consumer Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Subscription services
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	80,713	70,152	245,903	135,774
Subscription services | All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Subscription services | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Subscription services | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Subscription services | Auction and Liquidation Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Subscription services | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Subscription services | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	80,713	70,152	245,903	135,774
Subscription services | Consumer Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Sale of goods
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	125,146	4,130	251,310	7,895
Sale of goods | All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Sale of goods | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Sale of goods | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Sale of goods | Auction and Liquidation Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	65,117	2,550	67,009	2,550
Sale of goods | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Sale of goods | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	1,638	1,580	5,145	5,345
Sale of goods | Consumer Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	58,391	0	179,156	0
Advertising, licensing and other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	15,674	11,187	47,144	26,728
Advertising, licensing and other | All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	9,928	4,072	28,870	5,382
Advertising, licensing and other | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Advertising, licensing and other | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Advertising, licensing and other | Auction and Liquidation Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Advertising, licensing and other | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0	0	0
Advertising, licensing and other | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	1,442	2,092	4,620	6,592
Advertising, licensing and other | Consumer Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	4,304	5,023	13,654	14,754
Interest income - Loans and securities lending
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	69,731	57,594	222,116	182,855
Interest income - Loans and securities lending | All Other
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0	0	0
Interest income - Loans and securities lending | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	69,731	55,054	222,116	178,879
Interest income - Loans and securities lending | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0	0	0
Interest income - Loans and securities lending | Auction and Liquidation Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	2,540	0	3,976
Interest income - Loans and securities lending | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0	0	0
Interest income - Loans and securities lending | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0	0	0
Interest income - Loans and securities lending | Consumer Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0	0	0
Trading (losses) gains on investments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	(9,728)	12,243	31,722	(124,775)
Trading (losses) gains on investments | All Other
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0	0	0
Trading (losses) gains on investments | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	(10,218)	11,216	29,486	(127,852)
Trading (losses) gains on investments | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	490	1,027	2,236	3,077
Trading (losses) gains on investments | Auction and Liquidation Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0	0	0
Trading (losses) gains on investments | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0	0	0
Trading (losses) gains on investments | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0	0	0
Trading (losses) gains on investments | Consumer Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0	0	0
Fair value adjustment on loans
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	(859)	(19,160)	51,624	(19,183)
Fair value adjustment on loans | All Other
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0	0	0
Fair value adjustment on loans | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	(859)	(19,160)	51,624	(19,183)
Fair value adjustment on loans | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0	0	0
Fair value adjustment on loans | Auction and Liquidation Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0	0	0
Fair value adjustment on loans | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0	0	0
Fair value adjustment on loans | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0	0	0
Fair value adjustment on loans | Consumer Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0	0	0
Other
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	5,903	51,728	20,922	69,832
Other | All Other
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0	0	0
Other | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	4,030	50,633	17,959	64,593
Other | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	1,873	1,095	2,963	5,239
Other | Auction and Liquidation Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0	0	0
Other | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0		0	0
Other | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0	0	0
Other | Consumer Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	$ 0	$ 0	$ 0	$ 0

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 41
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-41

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-05(b)(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479557/942-235-S99-1

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