Cash, Cash Equivalents, and Cash Restricted for Regulatory Purposes for Periods Presented in Consolidated Statement of Financial Condition - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Cash Flows [Abstract]
Cash and cash equivalents	$ 2,648,308	$ 3,361,801	$ 2,199,985
Cash segregated for regulatory purposes	29,895	162,048	29,017
Total cash, cash equivalents, and cash segregated for regulatory purposes	$ 2,678,203	$ 3,523,849	$ 2,229,002