v3.26.1
Credit Agreement and Short-term Financing - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Feb. 02, 2029
Feb. 04, 2026
Aug. 09, 2023
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Line Of Credit Facility [Line Items]            
Borrowings       $ 228,250   $ 220,000
Receivables from broker-dealers, clearing organizations and customers, pledged as collateral       75,072    
Interest expense on short-term debt       200 $ 200  
Outstanding overdrafts payable       0    
Collateralized Agreements [Member]            
Line Of Credit Facility [Line Items]            
Interest expense on borrowings       100 0  
Maximum available borrowings to subsidiary under agreement       $ 500,000    
Interest rate, stated percentage       1.00%    
Unused borrowing capacity, amount under agreement       $ 428,700    
Uncommitted Collateralized Facility [Member]            
Line Of Credit Facility [Line Items]            
Borrowings       $ 71,300    
Collateralized Borrowing Agreement [Member]            
Line Of Credit Facility [Line Items]            
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]       us-gaap:BaseRateMember    
Minimum [Member] | Collateralized Agreements [Member]            
Line Of Credit Facility [Line Items]            
Interest rate, stated percentage       0.25%    
2021 Credit Agreement [Member]            
Line Of Credit Facility [Line Items]            
Interest expense on borrowings       $ 2,700 0  
2023 Credit Agreement [Member]            
Line Of Credit Facility [Line Items]            
Period of credit agreement     3 years      
Repayment of borrowings       63,000 $ 0  
Amount available under credit agreement       $ 592,900    
Line of Credit Facility, Description       On August 9, 2023, the Company entered into a three-year revolving credit facility (the “2023 Credit Agreement”) provided by a syndicate of lenders and JPMorgan Chase Bank, N.A. (“JPMorgan”), as administrative agent    
2023 Amended and Restated Credit Agreement [Member]            
Line Of Credit Facility [Line Items]            
Period of credit agreement   3 years        
Credit spread adjustment   0.10%        
Sub-limit for swingline loans   $ 380,000        
Line of Credit Facility, Description       On February 4, 2026, the Company entered into an amended and restated three-year revolving credit facility (the “Credit Agreement”) provided by a syndicate of lenders and JPMorgan, as administrative agent    
2023 Amended and Restated Credit Agreement [Member] | Minimum [Member]            
Line Of Credit Facility [Line Items]            
Changes of debt amount under the calculation of consolidated leverage ratio   30,000        
2023 Amended and Restated Credit Agreement [Member] | Maximum [Member]            
Line Of Credit Facility [Line Items]            
Changes of debt amount under the calculation of consolidated leverage ratio   200,000        
Revolving Credit Facility [Member] | 2023 Credit Agreement [Member]            
Line Of Credit Facility [Line Items]            
Revolving loans and letters of credit     $ 750,000      
Borrowings       $ 157,000   220,000
Letter of credit outstanding       $ 100   100
Amount available under credit agreement           $ 529,900
Revolving Credit Facility [Member] | 2023 Amended and Restated Credit Agreement [Member]            
Line Of Credit Facility [Line Items]            
Revolving loans and letters of credit   $ 750,000        
Period of credit agreement   364 days        
Additional borrowings under credit agreement   $ 375,000        
Revolving Credit Facility [Member] | 2023 Amended and Restated Credit Agreement [Member] | Subsequent Event [Member]            
Line Of Credit Facility [Line Items]            
Expiration period of credit agreement Feb. 02, 2029          
Standby Letters of Credit [Member] | 2023 Amended and Restated Credit Agreement [Member]            
Line Of Credit Facility [Line Items]            
Sub-limit for letter of credit   $ 5,000