Cash, Cash Equivalents, and Cash Restricted for Regulatory Purposes for Periods Presented in Consolidated Statement of Financial Condition - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Statement of Cash Flows [Abstract]
Cash and cash equivalents	$ 2,765,747	$ 2,199,985
Cash segregated for regulatory purposes	20,551	29,017
Total cash, cash equivalents, and cash segregated for regulatory purposes	$ 2,786,298	$ 2,229,002