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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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