Significant Accounting Policies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Significant Accounting Policies [Line Items]
Total Assets	$ 5,358,097	$ 4,173,971	$ 3,703,298
Total Liabilities	$ 3,038,231	2,232,163
Investment Banking And Investment Management Receivables Collection Periods	90 days
Placement Fees Receivables Collection Period	180 days
Private Funds Capital Raising and Private Capital Receivables Collection Period	1 year
Restructuring Receivables Collection Period	90 days
Receivables Reflected in Other Assets in Excess of Period	1 year
Contract Asset Recognized For Cost of Obtaining Contract With Benefit in Excess of Period	1 year
Expense Recognized For Cost of Obtaining Contract With Amortization Less Than Period	1 year
Technology and Information Services	$ 146,222	120,995	106,663
Professional Fees	$ 103,044	96,205	73,741
Minimum
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Maximum
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	7 years
LP Units
Significant Accounting Policies [Line Items]
Limited Partnership Units Convertible Conversion Ratio	1
Revision of Prior Period, Reclassification, Adjustment
Significant Accounting Policies [Line Items]
Technology and Information Services		39,521	35,060
Professional Fees		(39,521)	$ (35,060)
Variable Interest Entity, Primary Beneficiary [Member]
Significant Accounting Policies [Line Items]
Total Assets	$ 1,269,753	581,814
Total Liabilities	$ 485,879	$ 246,321