Divestitures - Summarizes the Assets and Liabilities of the Disposal Group Classified (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale	$ 565,902	$ 551,351
Total liabilities held for sale	128,665	107,952
Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	154,699	159,123
Investments	27,904	24,507
Furniture and equipment, net	4,220	4,128
Other assets	127,628	107,764
Right-of-use assets	1,289	1,552
Intangible assets	4,482	4,903
Goodwill	159,826	159,826
Valuation adjustment (allowance) on disposal group	(8,931)	(7,400)
Assets held for sale	565,902	551,351
Payables: Brokers and dealers	38,291	32,983
Payables: Brokerage clients	13,991	10,232
Other liabilities	53,965	50,884
Accrued compensation and benefits	22,418	13,853
Total liabilities held for sale	128,665	107,952
Discontinued Operations, Held-for-sale | Brokers and Dealers
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Receivables, net:	34,731	44,717
Discontinued Operations, Held-for-sale | Brokerage Clients
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Receivables, net:	38,054	29,243
Discontinued Operations, Held-for-sale | Other Fees
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Receivables, net:	$ 22,000	$ 22,988