REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of revenues from contracts with customers (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													$ 962,152	$ 1,179,369	$ 665,300
Interest income - Loans and securities lending	$ 62,545	$ 57,594	$ 63,835	$ 61,426	$ 33,443	$ 26,869	$ 25,491	$ 36,920	$ 125,261	$ 62,411	$ 182,855	$ 89,280	245,400	122,723	102,499
Total revenues	$ 382,092	$ 312,117	$ 139,621	$ 246,840	$ 400,314	$ 392,281	$ 318,966	$ 443,137	$ 386,461	$ 762,103	$ 698,578	$ 1,154,384	1,080,670	1,554,698	834,217
Capital Markets Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													223,818	539,398	310,830
Total revenues													327,596	891,230	477,086
Wealth Management Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													224,104	358,487	71,204
Total revenues													234,257	381,984	73,149
Auction and Liquidation segment:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													69,509	73,517	88,764
Total revenues													74,096	73,517	88,764
Financial Consulting Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													98,508	94,312	90,906
Total revenues													98,508	94,312	91,622
Communications Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													235,655	93,347	87,138
Total revenues													235,655	93,347	87,138
Consumer Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													96,761	20,308	16,458
Total revenues													96,761	20,308	16,458
All Other:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													13,797
Total revenues													13,797
Corporate finance, consulting and investment banking fees
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													228,098	540,686	309,074
Corporate finance, consulting and investment banking fees | Capital Markets Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													169,955	484,247	255,023
Corporate finance, consulting and investment banking fees | Wealth Management Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0	0	0
Corporate finance, consulting and investment banking fees | Auction and Liquidation segment:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0	0	0
Corporate finance, consulting and investment banking fees | Financial Consulting Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													58,143	56,439	54,051
Corporate finance, consulting and investment banking fees | Communications Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0	0	0
Corporate finance, consulting and investment banking fees | Consumer Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0	0	0
Corporate finance, consulting and investment banking fees | All Other:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0
Wealth and asset management fees
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													217,352	289,480	78,595
Wealth and asset management fees | Capital Markets Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													12,547	6,769	7,391
Wealth and asset management fees | Wealth Management Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													204,805	282,711	71,204
Wealth and asset management fees | Auction and Liquidation segment:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0	0	0
Wealth and asset management fees | Financial Consulting Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0	0	0
Wealth and asset management fees | Communications Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0	0	0
Wealth and asset management fees | Consumer Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0	0	0
Wealth and asset management fees | All Other:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0
Commissions, fees and reimbursed expenses
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													113,561	181,110	135,306
Commissions, fees and reimbursed expenses | Capital Markets Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													41,316	48,382	48,416
Commissions, fees and reimbursed expenses | Wealth Management Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													19,299	75,776	0
Commissions, fees and reimbursed expenses | Auction and Liquidation segment:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													12,581	19,079	50,035
Commissions, fees and reimbursed expenses | Financial Consulting Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													40,365	37,873	36,855
Commissions, fees and reimbursed expenses | Communications Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0	0	0
Commissions, fees and reimbursed expenses | Consumer Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0	0	0
Commissions, fees and reimbursed expenses | All Other:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0
Subscription services
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													219,379	79,149	72,666
Subscription services | Capital Markets Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0	0	0
Subscription services | Wealth Management Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0	0	0
Subscription services | Auction and Liquidation segment:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0	0	0
Subscription services | Financial Consulting Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0	0	0
Subscription services | Communications Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													219,379	79,149	72,666
Subscription services | Consumer Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0	0	0
Subscription services | All Other:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0
Service contract revenues
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers														1,090	13,066
Service contract revenues | Capital Markets Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers														0	0
Service contract revenues | Wealth Management Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers														0	0
Service contract revenues | Auction and Liquidation segment:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers														1,090	13,066
Service contract revenues | Financial Consulting Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers														0	0
Service contract revenues | Communications Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers														0	0
Service contract revenues | Consumer Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers														0	0
Sale of goods
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													142,275	58,205	29,135
Sale of goods | Capital Markets Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0	0	0
Sale of goods | Wealth Management Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0	0	0
Sale of goods | Auction and Liquidation segment:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													56,928	53,348	25,663
Sale of goods | Financial Consulting Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0	0	0
Sale of goods | Communications Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													7,526	4,857	3,472
Sale of goods | Consumer Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													77,821	0	0
Sale of goods | All Other:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0
Advertising, licensing and other
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													41,487	29,649	27,458
Advertising, licensing and other | Capital Markets Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0	0	0
Advertising, licensing and other | Wealth Management Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0	0	0
Advertising, licensing and other | Auction and Liquidation segment:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0	0	0
Advertising, licensing and other | Financial Consulting Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													0	0	0
Advertising, licensing and other | Communications Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													8,750	9,341	11,000
Advertising, licensing and other | Consumer Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													18,940	20,308	16,458
Advertising, licensing and other | All Other:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Total revenues from contracts with customers													13,797
Interest income - Loans and securities lending
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Interest income - Loans and securities lending													245,400	122,723	102,499
Interest income - Loans and securities lending | Capital Markets Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Interest income - Loans and securities lending													240,813	122,723	102,499
Interest income - Loans and securities lending | Wealth Management Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Interest income - Loans and securities lending													0	0	0
Interest income - Loans and securities lending | Auction and Liquidation segment:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Interest income - Loans and securities lending													4,587	0	0
Interest income - Loans and securities lending | Financial Consulting Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Interest income - Loans and securities lending													0	0	0
Interest income - Loans and securities lending | Communications Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Interest income - Loans and securities lending													0	0	0
Interest income - Loans and securities lending | Consumer Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Interest income - Loans and securities lending													0	0	0
Interest income - Loans and securities lending | All Other:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Interest income - Loans and securities lending													0
Trading (losses) gains on investments
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Trading (losses) gains on investments													(148,294)	210,910	78,710
Trading (losses) gains on investments | Capital Markets Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Trading (losses) gains on investments													(151,816)	203,287	77,906
Trading (losses) gains on investments | Wealth Management Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Trading (losses) gains on investments													3,522	7,623	804
Trading (losses) gains on investments | Auction and Liquidation segment:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Trading (losses) gains on investments													0	0	0
Trading (losses) gains on investments | Financial Consulting Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Trading (losses) gains on investments													0	0	0
Trading (losses) gains on investments | Communications Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Trading (losses) gains on investments													0	0	0
Trading (losses) gains on investments | Consumer Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Trading (losses) gains on investments													0	0	0
Trading (losses) gains on investments | All Other:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Trading (losses) gains on investments													0
Fair value adjustment on loans
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Fair value adjustment on loans													(54,334)	9,635	(22,033)
Fair value adjustment on loans | Capital Markets Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Fair value adjustment on loans													(54,334)	9,635	(22,033)
Fair value adjustment on loans | Wealth Management Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Fair value adjustment on loans													0	0	0
Fair value adjustment on loans | Auction and Liquidation segment:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Fair value adjustment on loans													0	0	0
Fair value adjustment on loans | Financial Consulting Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Fair value adjustment on loans													0	0	0
Fair value adjustment on loans | Communications Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Fair value adjustment on loans													0	0	0
Fair value adjustment on loans | Consumer Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Fair value adjustment on loans													0	0	0
Fair value adjustment on loans | All Other:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Fair value adjustment on loans													0
Other
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Other													75,746	32,061	9,741
Other | Capital Markets Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Other													69,115	16,187	7,884
Other | Wealth Management Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Other													6,631	15,874	1,141
Other | Auction and Liquidation segment:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Other													0	0	0
Other | Financial Consulting Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Other													0	0	716
Other | Communications Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Other													0	0	0
Other | Consumer Segment
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Other													0	$ 0	$ 0
Other | All Other:
Revenue from Contracts with Customers (Details) - Schedule of revenues from contracts with customers [Line Items]
Other													$ 0