Acquisitions and Divestitures - Summarizes the Assets and Liabilities of the Disposal Group Classified (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill	$ 159,800
Assets held for sale	551,351	$ 0
Liabilities held for sale	107,952	$ 0
Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	159,123
Investments	24,507
Furniture and equipment, net	4,128
Other assets	107,764
Right-of-use assets	1,552
Intangible assets	4,903
Goodwill	159,826
Valuation adjustment (allowance) on disposal group	(7,400)
Assets held for sale	551,351
Payables: Brokers and dealers	32,983
Payables: Brokerage clients	10,232
Other liabilities	50,884
Accrued compensation and benefits	13,853
Liabilities held for sale	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:	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:	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:	$ 22,988