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REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of revenues from contracts with customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | $ 283,896 | $ 180,435 | $ 577,032 | $ 380,137
Total revenues | 406,278 | 139,621 | 838,368 | 386,461
All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 9,669 | 611 | 18,942 | 1,310
Total revenues | 9,669 | 611 | 18,942 | 1,310
Capital Markets Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 39,931 | 49,328 | 88,963 | 105,446
Total revenues | 162,052 | 1,291 | 347,463 | 104,140
Wealth Management Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 47,455 | 56,602 | 94,694 | 133,674
Total revenues | 47,716 | 62,389 | 97,530 | 139,868
Auction and Liquidation Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 10,561 | 2,488 | 16,221 | 5,843
Total revenues | 10,561 | 3,924 | 16,221 | 7,279
Financial Consulting Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 31,212 | 24,310 | 56,222 | 50,246
Total revenues | 31,212 | 24,310 | 56,222 | 50,246
Communications Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 84,956 | 41,922 | 171,875 | 73,887
Total revenues | 84,956 | 41,922 | 171,875 | 73,887
Consumer Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 60,112 | 5,174 | 130,115 | 9,731
Total revenues | 60,112 | 5,174 | 130,115 | 9,731
Corporate finance, consulting and investment banking fees |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 49,871 | 51,119 | 103,536 | 109,762
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 | 30,727 | 35,473 | 69,877 | 77,146
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 | 19,144 | 15,646 | 33,659 | 32,616
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 | 45,707 | 55,810 | 89,681 | 122,432
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 | 1,258 | 2,519 | 1,922 | 4,919
Wealth and asset management fees | Wealth Management Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 44,449 | 53,291 | 87,759 | 117,513
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 | 31,905 | 25,799 | 60,991 | 63,015
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 | 7,946 | 11,336 | 17,164 | 23,381
Commissions, fees and reimbursed expenses | Wealth Management Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 3,006 | 3,311 | 6,935 | 16,161
Commissions, fees and reimbursed expenses | Auction and Liquidation Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 8,885 | 2,488 | 14,329 | 5,843
Commissions, fees and reimbursed expenses | Financial Consulting Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 12,068 | 8,664 | 22,563 | 17,630
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 | 82,183 | 37,809 | 165,190 | 65,622
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 | 82,183 | 37,809 | 165,190 | 65,622
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 | 58,387 | 1,887 | 126,164 | 3,765
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 | 1,676 | 0 | 1,892 | 0
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 | 1,640 | 1,887 | 3,507 | 3,765
Sale of goods | Consumer Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 55,071 | 0 | 120,765 | 0
Advertising, licensing and other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 15,843 | 8,011 | 31,470 | 15,541
Advertising, licensing and other | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 9,669 | 611 | 18,942 | 1,310
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 | 1,133 | 2,226 | 3,178 | 4,500
Advertising, licensing and other | Consumer Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 5,041 | 5,174 | 9,350 | 9,731
Interest income - Loans and securities lending |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue Not from Contract with Customer | 75,199 | 63,835 | 152,385 | 125,261
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 | 75,199 | 62,399 | 152,385 | 123,825
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 | 1,436 | 0 | 1,436
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 gains on investments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue Not from Contract with Customer | 33,158 | (106,801) | 41,450 | (137,017)
Trading gains on investments | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue Not from Contract with Customer | 0 | 0 | 0 | 0
Trading gains on investments | Capital Markets Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue Not from Contract with Customer | 32,685 | (108,329) | 39,705 | (139,067)
Trading gains on investments | Wealth Management Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue Not from Contract with Customer | 473 | 1,528 | 1,745 | 2,050
Trading 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 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 gains on investments | Communications Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue Not from Contract with Customer | 0 | 0 | 0 | 0
Trading 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 | 9,207 | (10,962) | 52,483 | (24)
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 | 9,207 | (10,962) | 52,483 | (24)
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 | 4,818 | 13,114 | 15,018 | 18,104
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 | 5,030 | 8,855 | 13,927 | 13,960
Other | Wealth Management Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue Not from Contract with Customer | (212) | 4,259 | 1,091 | 4,144
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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 924 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479941/924-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-30 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-40 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 10: 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 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-4 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. 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