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Business Changes and Developments (Details)
£ in Thousands, shares in Thousands, $ in Thousands
 12 Months Ended
Oct. 01, 2025
GBP (£)
shares
Oct. 01, 2025
USD ($)
shares
Dec. 31, 2025
USD ($)
Dec. 31, 2025
GBP (£)
Dec. 31, 2025
USD ($)
Business Combination [Line Items]          
Goodwill, Acquired During Period     $ 102,221    
Amortization of Intangible Assets     3,660    
Impairment of Intangible Assets, Finite-Lived     $ 0    
Robey Warshaw          
Business Combination [Line Items]          
Business Combination, Consideration Transferred, Cash   $ 5,345      
Robey Warshaw | Acquisition-related Awards          
Business Combination [Line Items]          
Repayment period     4 years    
Robey Warshaw | Investment Banking & Equities          
Business Combination [Line Items]          
Goodwill, Acquired During Period   102,221      
Amortization of Intangible Assets     $ 3,660    
Robey Warshaw | Advisory Backlog | Investment Banking & Equities          
Business Combination [Line Items]          
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived   $ 10,887      
Finite-Lived Intangible Asset, Useful Life   18 months      
Robey Warshaw | Client Relationships | Investment Banking & Equities          
Business Combination [Line Items]          
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived   $ 22,850      
Finite-Lived Intangible Asset, Useful Life   3 years      
Robey Warshaw | Payable to Employees and Related Parties          
Business Combination [Line Items]          
Consideration transferable on first anniversary   $ 94,893   £ 74,813 $ 100,796
Robey Warshaw | Other Noncurrent Liabilities          
Business Combination [Line Items]          
Business Combination, Contingent Consideration, Liability, Noncurrent         $ 24,521
Robey Warshaw | First Anniversary Of Closing          
Business Combination [Line Items]          
Business combination, consideration transferred, period due     1 year    
Robey Warshaw | Sixth Anniversary Of Closing          
Business Combination [Line Items]          
Business combination, consideration transferred, period due     6 years    
Robey Warshaw | Class A          
Business Combination [Line Items]          
Consideration £ 71,250 $ 95,767      
Shares Issued as Consideration for Acquisitions | shares 275 275      
Robey Warshaw | Class A | Acquisition-related Awards          
Business Combination [Line Items]          
Consideration Subject to Repayment £ 62,700 $ 84,275