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Prior Periods Financial Statement Revisions - Summary of Revision of Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Consolidated net income (loss)	$ (12,744)	$ 9,904	$ 39,273	$ 20,169	$ (33,475)	$ (1,553)	$ 22,307	$ 84,974	$ 59,442	$ 69,346	$ 56,602	$ 72,253	$ 286,610
Less: Consolidated net income from discontinued operations, net of tax													(178,462)
Adjustments to reconcile consolidated net income (loss) to net cash provided by (used in) operating activities:
Employee loan amortization and reserves on employee loans											67,032	35,650	16,460
Equity-based compensation and allocations of net income to limited partnership units and FPUs											183,545	170,625	200,057
Loss (gains) on other investments											431	(18,163)	(43,113)
Deferred tax provision (benefit)				2,686					2,622	6,798	(16,549)	(4,196)	(23,737)
Consolidated net income (loss), adjusted for non-cash and non-operating items				107,658					213,261	298,498	395,296	338,157	325,895
Decrease (increase) in operating assets:
Accrued commissions receivable, net				(60,582)					50,660	91,814	44,389	(22,287)	(108,851)
Other assets				(7,928)					2,116	(15,099)	(20,070)	5,239	(25,343)
Increase (decrease) in operating liabilities:
Accrued compensation											13,752	(7,231)	(49,853)
Accounts payable, accrued and other liabilities				(44,770)					(78,249)	(39,488)	57,791	(17,878)	51,003
Repurchase agreements												(986)	986
Payables to broker-dealers, clearing organizations, customers and related broker-dealers											(235,605)	(353,313)	167,443
Other											2,730	(5,682)	4,445
Net cash provided by (used in) operating activities											304,263	239,062	(67,345)
CASH FLOWS FROM INVESTING ACTIVITIES:
Net cash provided by (used in) investing activities											(77,592)	(40,602)	9,236
CASH FLOWS FROM FINANCING ACTIVITIES:
Net cash provided by (used in) financing activities											(13,101)	18,246	50,888
Net cash provided by (used in) operating activities from discontinued operations											0	0	(748,231)
Net cash provided by (used in) investing activities from discontinued operations											0	0	18,347
Net cash provided by (used in) financing activities from discontinued operations											0	0	367,931
Effect of exchange rate changes on Cash and cash equivalents, and Cash segregated under regulatory requirements				(13,496)					(14,286)	(6,197)	993	2,630	(10,838)
Net increase (decrease) in Cash and cash equivalents, and Cash segregated under regulatory requirements				21,248					50,886	100,419	214,563	219,336	(380,012)
Cash and cash equivalents, and Cash segregated under regulatory requirements at beginning of period	736,533	687,000	657,362	636,114				416,778	636,114	636,114	636,114	416,778	796,790
Cash and cash equivalents, and Cash segregated under regulatory requirements at end of period	850,677	736,533	687,000	657,362	636,114				687,000	736,533	850,677	636,114	416,778
As Reported [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Consolidated net income (loss)		24,930	39,559	21,032	(26,556)	$ 2,560	$ 21,765	87,174	60,591	85,521		84,943	279,866
Less: Consolidated net income from discontinued operations, net of tax													(176,169)
Adjustments to reconcile consolidated net income (loss) to net cash provided by (used in) operating activities:
Employee loan amortization and reserves on employee loans													13,015
Equity-based compensation and allocations of net income to limited partnership units and FPUs												165,612	205,070
Loss (gains) on other investments												(22,785)	(38,491)
Deferred tax provision (benefit)				786					722	(1,202)		(1,803)	(22,635)
Consolidated net income (loss), adjusted for non-cash and non-operating items				106,621					212,363	306,673		343,605	324,291
Decrease (increase) in operating assets:
Accrued commissions receivable, net				(59,682)					51,560	92,714		(12,418)
Other assets				7,698					8,924	(14,782)		3,784	(30,924)
Reverse repurchase agreements													986
Increase (decrease) in operating liabilities:
Accrued compensation												(4,131)	(52,953)
Accounts payable, accrued and other liabilities				(60,259)					(85,059)	(48,880)		(34,840)	63,214
Payables to broker-dealers, clearing organizations, customers and related broker-dealers													165,517
Net cash provided by (used in) operating activities												239,062	(67,345)
CASH FLOWS FROM INVESTING ACTIVITIES:
Net cash provided by (used in) investing activities												(40,602)	9,236
CASH FLOWS FROM FINANCING ACTIVITIES:
Net cash provided by (used in) financing activities												18,246	50,888
Net cash provided by (used in) operating activities from discontinued operations													(748,231)
Net cash provided by (used in) investing activities from discontinued operations													18,347
Net cash provided by (used in) financing activities from discontinued operations													367,931
Effect of exchange rate changes on Cash and cash equivalents, and Cash segregated under regulatory requirements				(13,496)					(14,286)	(6,197)		2,630	(10,838)
Net increase (decrease) in Cash and cash equivalents, and Cash segregated under regulatory requirements				21,248					50,886	100,419		219,336	(380,012)
Cash and cash equivalents, and Cash segregated under regulatory requirements at beginning of period	$ 736,533	687,000	657,362	636,114				$ 416,778	636,114	636,114	$ 636,114	416,778	796,790
Cash and cash equivalents, and Cash segregated under regulatory requirements at end of period		$ 736,533	$ 687,000	$ 657,362	$ 636,114				$ 687,000	$ 736,533		636,114	416,778
Adjustments [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Consolidated net income (loss)												(12,690)	6,744
Less: Consolidated net income from discontinued operations, net of tax													(2,293)
Adjustments to reconcile consolidated net income (loss) to net cash provided by (used in) operating activities:
Employee loan amortization and reserves on employee loans													3,445
Equity-based compensation and allocations of net income to limited partnership units and FPUs												5,013	(5,013)
Loss (gains) on other investments												4,622	(4,622)
Deferred tax provision (benefit)												(2,393)	(1,102)
Consolidated net income (loss), adjusted for non-cash and non-operating items												(5,448)	1,604
Decrease (increase) in operating assets:
Accrued commissions receivable, net												(9,869)
Other assets												1,455	5,581
Reverse repurchase agreements													(986)
Increase (decrease) in operating liabilities:
Accrued compensation												(3,100)	3,100
Accounts payable, accrued and other liabilities												$ 16,962	(12,211)
Repurchase agreements													986
Payables to broker-dealers, clearing organizations, customers and related broker-dealers													1,926
Other													$ 4,445

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