Divestitures And Acquisitions - Summarizes the Assets and Liabilities of the Disposal Group Classified (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill	$ 159,800
Assets held for sale	564,776	$ 551,351
Liabilities held for sale	153,342	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	153,047	159,123
Investments	17,029	24,507
Furniture and equipment, net	5,807	4,128
Other assets	104,228	107,764
Right-of-use assets	5,032	1,552
Intangible assets	4,061	4,903
Goodwill	159,826	159,826
Valuation adjustment (allowance) on disposal group	(6,600)	(7,400)
Assets held for sale	564,776	551,351
Payables: Brokers and dealers	39,359	32,983
Payables: Brokerage clients	16,885	10,232
Other liabilities	67,938	50,884
Accrued compensation and benefits	29,160	13,853
Liabilities held for sale	153,342	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:	32,669	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:	74,351	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:	$ 15,326	$ 22,988