v3.25.2
Fair Value Measurements - Not Measured at Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Assets, not measured at fair value      
Cash and cash equivalents $ 4,185,337 $ 967,079 $ 1,318,894
Cash segregated under federal and other regulations 1,611,200 1,597,249 1,530,150
Restricted cash 116,675 119,724 $ 109,618
Receivables from clients, net 710,463 633,834  
Receivables from brokers, dealers and clearing organizations 129,490 76,545  
Advisor loans, net 2,536,190 2,281,088  
Other receivables, net 951,063 902,777  
Investment securities - held-to-maturity securities 15,323 15,214  
Other assets 1,959,779 1,815,739  
Liabilities, not measured at fair value      
Payables to clients 2,090,520 1,898,665  
Payables to broker-dealers and clearing organizations 273,593 129,228  
Corporate long-term debt 7,175,032 5,494,724  
Fair Value, Recurring      
Assets, not measured at fair value      
Restricted cash 111,713 100,368  
Other assets 1,272,201 1,139,515  
Other investments | Fair Value, Recurring      
Assets, not measured at fair value      
Other assets 2,313 3,989  
Deferred compensation plan | Fair Value, Recurring      
Assets, not measured at fair value      
Other assets 956,489 856,843  
Level 1 | Fair Value, Recurring      
Assets, not measured at fair value      
Restricted cash 111,713 100,368  
Other assets 1,269,888 1,135,526  
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 956,489 856,843  
Level 2 | Fair Value, Recurring      
Assets, not measured at fair value      
Restricted cash 0 0  
Other assets 2,313 3,989  
Level 2 | Other investments | Fair Value, Recurring      
Assets, not measured at fair value      
Other assets 2,313 3,989  
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 3,382,897 913,407  
Cash segregated under federal and other regulations 963,745 925,085  
Restricted cash 4,962 19,356  
Receivables from clients, net 710,463 633,834  
Receivables from brokers, dealers and clearing organizations 129,490 76,545  
Advisor loans, net 374,346 360,760  
Other receivables, net 951,063 902,777  
Investment securities - held-to-maturity securities 15,323 15,214  
Other assets 26,882 21,259  
Liabilities, not measured at fair value      
Payables to clients 2,090,520 1,898,665  
Payables to broker-dealers and clearing organizations 273,593 129,228  
Corporate long-term debt 7,175,032 5,494,724  
Financial instruments not measured at fair value | Other investments      
Assets, not measured at fair value      
Other assets 8,332 7,706  
Financial instruments not measured at fair value | Securities borrowed      
Assets, not measured at fair value      
Other assets 8,146 4,811  
Financial instruments not measured at fair value | Deferred compensation plan      
Assets, not measured at fair value      
Other assets 10,404 8,742  
Financial instruments not measured at fair value | Total Fair Value      
Assets, not measured at fair value      
Cash and cash equivalents 3,382,897 913,407  
Cash segregated under federal and other regulations 963,745 925,085  
Restricted cash 4,962 19,356  
Receivables from clients, net 710,463 633,834  
Receivables from brokers, dealers and clearing organizations 129,490 76,545  
Advisor loans, net 300,384 281,146  
Other receivables, net 951,063 902,777  
Investment securities - held-to-maturity securities 15,395 15,190  
Other assets 26,882 21,259  
Liabilities, not measured at fair value      
Payables to clients 2,090,520 1,898,665  
Payables to broker-dealers and clearing organizations 273,593 129,228  
Corporate long-term debt 7,284,719 5,480,389  
Financial instruments not measured at fair value | Total Fair Value | Other investments      
Assets, not measured at fair value      
Other assets 8,332 7,706  
Financial instruments not measured at fair value | Total Fair Value | Securities borrowed      
Assets, not measured at fair value      
Other assets 8,146 4,811  
Financial instruments not measured at fair value | Total Fair Value | Deferred compensation plan      
Assets, not measured at fair value      
Other assets 10,404 8,742  
Financial instruments not measured at fair value | Level 1      
Assets, not measured at fair value      
Cash and cash equivalents 3,382,897 913,407  
Cash segregated under federal and other regulations 963,745 925,085  
Restricted cash 4,962 19,356  
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 10,404 8,742  
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 10,404 8,742  
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 710,463 633,834  
Receivables from brokers, dealers and clearing organizations 129,490 76,545  
Advisor loans, net 0 0  
Other receivables, net 951,063 902,777  
Investment securities - held-to-maturity securities 15,395 15,190  
Other assets 16,478 12,517  
Liabilities, not measured at fair value      
Payables to clients 2,090,520    
Payables to broker-dealers and clearing organizations 273,593    
Corporate long-term debt 7,284,719 5,480,389  
Financial instruments not measured at fair value | Level 2 | Other investments      
Assets, not measured at fair value      
Other assets 8,332 7,706  
Financial instruments not measured at fair value | Level 2 | Securities borrowed      
Assets, not measured at fair value      
Other assets 8,146 4,811  
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 300,384 281,146  
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