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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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