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REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of revenues from contracts with customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	$ 308,846	$ 293,134
Total revenues	343,032	432,090
All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	26,674	13,582
Total revenues	26,674	13,582
Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	57,475	49,031
Total revenues	89,823	185,411
Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	49,944	47,238
Total revenues	51,782	49,814
Auction and Liquidation Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	5,780	5,660
Total revenues	5,780	5,660
Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	35,085	25,010
Total revenues	35,085	25,010
Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	82,366	86,919
Total revenues	82,366	86,919
Communications Segment | All Other
Revenue from External Customer [Line Items]
Total revenues	26,674	13,582
Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	51,522	65,694
Total revenues	51,522	65,694
Corporate finance, consulting and investment banking fees
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	73,147	53,664
Corporate finance, consulting and investment banking fees | All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	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	50,163	39,149
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
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
Corporate finance, consulting and investment banking fees | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	22,984	14,515
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
Corporate finance, consulting and investment banking fees | Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Wealth and asset management fees
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	47,113	43,974
Wealth and asset management fees | All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Wealth and asset management fees | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	1,056	664
Wealth and asset management fees | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	46,057	43,310
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
Wealth and asset management fees | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	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
Wealth and asset management fees | Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Commissions, fees and reimbursed expenses
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	24,824	29,085
Commissions, fees and reimbursed expenses | All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Commissions, fees and reimbursed expenses | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	6,256	9,218
Commissions, fees and reimbursed expenses | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	3,887	3,928
Commissions, fees and reimbursed expenses | Auction and Liquidation Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	2,580	5,444
Commissions, fees and reimbursed expenses | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	12,101	10,495
Commissions, fees and reimbursed expenses | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Commissions, fees and reimbursed expenses | Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Subscription services
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	79,738	83,008
Subscription services | All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Subscription services | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Subscription services | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Subscription services | Auction and Liquidation Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Subscription services | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Subscription services | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	79,738	83,008
Subscription services | Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Service contract revenues
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	980	67,777
Service contract revenues | All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Service contract revenues | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Service contract revenues | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Service contract revenues | Auction and Liquidation Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	980	216
Service contract revenues | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Service contract revenues | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	1,867
Service contract revenues | Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	65,694
Sale of goods
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	55,653
Sale of goods | All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	615
Sale of goods | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0
Sale of goods | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0
Sale of goods | Auction and Liquidation Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	2,220
Sale of goods | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0
Sale of goods | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	1,296
Sale of goods | Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	51,522
Advertising, licensing and other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	27,391	15,626
Advertising, licensing and other | All Other
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	26,059	13,582
Advertising, licensing and other | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	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
Advertising, licensing and other | Auction and Liquidation Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	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
Advertising, licensing and other | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	1,332	2,044
Advertising, licensing and other | Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Total revenues from contracts with customers	0	0
Interest income - Loans and securities lending
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	59,944	77,186
Interest income - Loans and securities lending | All Other
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	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	59,944	77,186
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
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	0
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
Interest income - Loans and securities lending | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0
Interest income - Loans and securities lending | Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0
Trading (losses) gains on investments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	(17,667)	8,292
Trading (losses) gains on investments | All Other
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0
Trading (losses) gains on investments | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	(18,267)	7,020
Trading (losses) gains on investments | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	600	1,272
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
Trading (losses) gains on investments | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	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
Trading (losses) gains on investments | Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0
Fair value adjustment on loans
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	(12,201)	43,276
Fair value adjustment on loans | All Other
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0
Fair value adjustment on loans | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	(12,201)	43,276
Fair value adjustment on loans | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	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
Fair value adjustment on loans | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	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
Fair value adjustment on loans | Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0
Other
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	4,110	10,202
Other | All Other
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0
Other | Capital Markets Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	2,872	8,898
Other | Wealth Management Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	1,238	1,304
Other | Auction and Liquidation Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0
Other | Financial Consulting Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0
Other | Communications Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	0	0
Other | Consumer Products Segment | Operating Segments
Revenue from External Customer [Line Items]
Revenue Not from Contract with Customer	$ 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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