Cash, Cash Equivalents, and Cash Restricted for Regulatory Purposes for Periods Presented in Consolidated Statement of Financial Condition - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Statement of Cash Flows [Abstract]
Cash and cash equivalents	$ 2,725,992	$ 2,648,308
Cash segregated for regulatory purposes	28,065	29,895
Total cash, cash equivalents, and cash segregated for regulatory purposes	$ 2,754,057	$ 2,678,203