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Leases - Additional Information (Details)
£ in Thousands, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2026
GBP (£)
Dec. 31, 2025
USD ($)
Dec. 31, 2023
USD ($)
Floor
Jan. 01, 2026
GBP (£)
Lessee, Lease, Description [Line Items]                
Operating Lease, Cost $ 15,060 $ 14,320 $ 43,899 $ 41,817        
Variable Lease, Cost 1,662 1,545 4,566 4,434        
Operating Lease, Payments     34,150 37,282        
Operating Lease, Incentive Payments Received     1,684 3,056        
Lessee, operating lease, option, number to take on additional floors | Floor             3  
Future lease payments $ 122,689   $ 122,689          
Minimum [Member]                
Lessee, Lease, Description [Line Items]                
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract 3 years   3 years          
Maximum [Member]                
Lessee, Lease, Description [Line Items]                
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract 11 years   11 years          
Forecast [Member] | London, United Kingdom                
Lessee, Lease, Description [Line Items]                
Operating Lease, Additional Cost | £         £ 12,000      
Future lease payments | £               £ 175,000
Forecast [Member] | New York, New York                
Lessee, Lease, Description [Line Items]                
Operating Lease, Additional Cost           $ 9,862    
Letter of Credit [Member]                
Lessee, Lease, Description [Line Items]                
Other Assets $ 5,855   $ 5,855       $ 5,757  
Office Equipment [Member]                
Lessee, Lease, Description [Line Items]                
Operating Lease, Cost $ 1,657 $ 1,416 $ 4,699 $ 4,201