v3.26.1
Fair Value Measurements - Not Measured at Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Assets, not measured at fair value      
Cash and cash equivalents $ 1,275,690 $ 1,037,378 $ 4,185,337
Cash segregated under federal and other regulations 1,420,167 1,792,064 1,611,200
Restricted cash 232,889 225,298 $ 116,675
Receivables from clients, net 994,139 803,206  
Receivables from brokers, dealers and clearing organizations 244,302 70,897  
Advisor loans, net 3,889,372 3,681,512  
Other receivables, net 1,427,985 1,203,539  
Investment securities - held-to-maturity securities 15,493 15,420  
Other assets 2,418,172 2,202,444  
Liabilities, not measured at fair value      
Payables to clients 2,256,333 2,308,275  
Payables to broker-dealers and clearing organizations 599,397 150,520  
Corporate long-term debt 7,460,510 7,258,694  
Fair Value, Recurring      
Assets, not measured at fair value      
Restricted cash 138,459 127,585  
Other assets 1,671,561 1,471,620  
Other investments | Fair Value, Recurring      
Assets, not measured at fair value      
Other assets 1,926 2,423  
Deferred compensation plan | Fair Value, Recurring      
Assets, not measured at fair value      
Other assets 1,247,873 1,097,514  
Level 1 | Fair Value, Recurring      
Assets, not measured at fair value      
Restricted cash 138,459 127,585  
Other assets 1,669,635 1,469,197  
Level 1 | Other investments | Fair Value, Recurring      
Assets, not measured at fair value      
Other assets 0 0  
Level 1 | Deferred compensation plan | Fair Value, Recurring      
Assets, not measured at fair value      
Other assets 1,247,873 1,097,514  
Level 2 | Fair Value, Recurring      
Assets, not measured at fair value      
Restricted cash 0 0  
Other assets 1,926 2,423  
Level 2 | Other investments | Fair Value, Recurring      
Assets, not measured at fair value      
Other assets 1,926 2,423  
Level 2 | Deferred compensation plan | Fair Value, Recurring      
Assets, not measured at fair value      
Other assets 0 0  
Level 3 | Fair Value, Recurring      
Assets, not measured at fair value      
Restricted cash 0 0  
Other assets 0 0  
Level 3 | Other investments | Fair Value, Recurring      
Assets, not measured at fair value      
Other assets 0 0  
Level 3 | Deferred compensation plan | Fair Value, Recurring      
Assets, not measured at fair value      
Other assets 0 0  
Financial instruments not measured at fair value      
Assets, not measured at fair value      
Cash and cash equivalents 1,219,850 933,001  
Cash segregated under federal and other regulations 897,010 970,730  
Restricted cash 94,430 97,713  
Receivables from clients, net 994,139 803,206  
Receivables from brokers, dealers and clearing organizations 244,302 70,897  
Advisor loans, net 387,626 406,793  
Other receivables, net 1,427,985 1,203,539  
Investment securities - held-to-maturity securities 15,493 15,420  
Other assets 24,246 19,701  
Liabilities, not measured at fair value      
Payables to clients 2,256,333 2,308,275  
Payables to broker-dealers and clearing organizations 599,397 150,520  
Corporate long-term debt 7,460,510 7,258,694  
Financial instruments not measured at fair value | Other investments      
Assets, not measured at fair value      
Other assets 7,259 7,874  
Financial instruments not measured at fair value | Securities borrowed      
Assets, not measured at fair value      
Other assets 3,506 1,789  
Financial instruments not measured at fair value | Deferred compensation plan      
Assets, not measured at fair value      
Other assets 13,481 10,038  
Financial instruments not measured at fair value | Total Fair Value      
Assets, not measured at fair value      
Cash and cash equivalents 1,219,850 933,001  
Cash segregated under federal and other regulations 897,010 970,730  
Restricted cash 94,430 97,713  
Receivables from clients, net 994,139 803,206  
Receivables from brokers, dealers and clearing organizations 244,302 70,897  
Advisor loans, net 310,764 335,050  
Other receivables, net 1,427,985 1,203,539  
Investment securities - held-to-maturity securities 15,442 15,520  
Other assets 24,246 19,701  
Liabilities, not measured at fair value      
Payables to clients 2,256,333 2,308,275  
Payables to broker-dealers and clearing organizations 599,397 150,520  
Corporate long-term debt 7,497,955 7,420,447  
Financial instruments not measured at fair value | Total Fair Value | Other investments      
Assets, not measured at fair value      
Other assets 7,259 7,874  
Financial instruments not measured at fair value | Total Fair Value | Securities borrowed      
Assets, not measured at fair value      
Other assets 3,506 1,789  
Financial instruments not measured at fair value | Total Fair Value | Deferred compensation plan      
Assets, not measured at fair value      
Other assets 13,481 10,038  
Financial instruments not measured at fair value | Level 1      
Assets, not measured at fair value      
Cash and cash equivalents 1,219,850 933,001  
Cash segregated under federal and other regulations 897,010 970,730  
Restricted cash 94,430 97,713  
Receivables from clients, net 0 0  
Receivables from brokers, dealers and clearing organizations 0 0  
Advisor loans, net 0 0  
Other receivables, net 0 0  
Investment securities - held-to-maturity securities 0 0  
Other assets 13,481 10,038  
Liabilities, not measured at fair value      
Payables to clients 0 0  
Payables to broker-dealers and clearing organizations 0 0  
Corporate long-term debt 0 0  
Financial instruments not measured at fair value | Level 1 | Other investments      
Assets, not measured at fair value      
Other assets 0 0  
Financial instruments not measured at fair value | Level 1 | Securities borrowed      
Assets, not measured at fair value      
Other assets 0 0  
Financial instruments not measured at fair value | Level 1 | Deferred compensation plan      
Assets, not measured at fair value      
Other assets 13,481 10,038  
Financial instruments not measured at fair value | Level 2      
Assets, not measured at fair value      
Cash and cash equivalents 0 0  
Cash segregated under federal and other regulations 0 0  
Restricted cash 0 0  
Receivables from clients, net 994,139 803,206  
Receivables from brokers, dealers and clearing organizations 244,302 70,897  
Advisor loans, net 0 0  
Other receivables, net 1,427,985 1,203,539  
Investment securities - held-to-maturity securities 15,442 15,520  
Other assets 10,765 9,663  
Liabilities, not measured at fair value      
Payables to clients 2,256,333    
Payables to broker-dealers and clearing organizations 599,397    
Corporate long-term debt 7,497,955 7,420,447  
Financial instruments not measured at fair value | Level 2 | Other investments      
Assets, not measured at fair value      
Other assets 7,259 7,874  
Financial instruments not measured at fair value | Level 2 | Securities borrowed      
Assets, not measured at fair value      
Other assets 3,506 1,789  
Financial instruments not measured at fair value | Level 2 | Deferred compensation plan      
Assets, not measured at fair value      
Other assets 0 0  
Financial instruments not measured at fair value | Level 3      
Assets, not measured at fair value      
Cash and cash equivalents 0 0  
Cash segregated under federal and other regulations 0 0  
Restricted cash 0 0  
Receivables from clients, net 0 0  
Receivables from brokers, dealers and clearing organizations 0 0  
Advisor loans, net 310,764 335,050  
Other receivables, net 0 0  
Investment securities - held-to-maturity securities 0 0  
Other assets 0 0  
Liabilities, not measured at fair value      
Payables to clients 0 0  
Payables to broker-dealers and clearing organizations 0 0  
Corporate long-term debt 0 0  
Financial instruments not measured at fair value | Level 3 | Other investments      
Assets, not measured at fair value      
Other assets 0 0  
Financial instruments not measured at fair value | Level 3 | Securities borrowed      
Assets, not measured at fair value      
Other assets 0 0  
Financial instruments not measured at fair value | Level 3 | Deferred compensation plan      
Assets, not measured at fair value      
Other assets $ 0 $ 0