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Fair Value of Financial Instruments - Financial Instruments Not Measured at Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Fair Value of Financial Instruments    
Receivable from brokers and dealers and clearing organizations $ 1,646 $ 0
Deposits with clearing organizations 25,990 20,523
Accounts receivable 155,426 129,937
Total assets 5,989,538 5,990,180
Payable to brokers and dealers and clearing organizations 1,644 0
Total liabilities 618,770 681,237
Equity investment without readily determinable fair values 21,000 21,100
Fair Value, Nonrecurring    
Fair Value of Financial Instruments    
Cash and restricted cash 235,577 318,495
Receivable from brokers and dealers and clearing organizations 1,646 0
Deposits with clearing organizations 25,990 20,523
Accounts receivable 155,426 129,937
Other assets – Memberships in clearing organizations 2,410 2,392
Total assets 421,049 471,347
Payable to brokers and dealers and clearing organizations 1,644 0
Total liabilities 1,644 0
Quoted Prices in active Markets for Identical Assets (Level 1) | Fair Value, Nonrecurring    
Fair Value of Financial Instruments    
Cash and restricted cash 235,577 318,495
Receivable from brokers and dealers and clearing organizations 0 0
Deposits with clearing organizations 25,990 20,523
Accounts receivable 0 0
Other assets – Memberships in clearing organizations 0 0
Total assets 261,567 339,018
Payable to brokers and dealers and clearing organizations 0 0
Total liabilities 0 0
Significant Observable Inputs (Level 2) | Fair Value, Nonrecurring    
Fair Value of Financial Instruments    
Cash and restricted cash 0 0
Receivable from brokers and dealers and clearing organizations 1,646 0
Deposits with clearing organizations 0 0
Accounts receivable 155,426 129,937
Other assets – Memberships in clearing organizations 0 0
Total assets 157,072 129,937
Payable to brokers and dealers and clearing organizations 1,644 0
Total liabilities 1,644 0
Significant Unobservable Inputs (Level 3) | Fair Value, Nonrecurring    
Fair Value of Financial Instruments    
Cash and restricted cash 0 0
Receivable from brokers and dealers and clearing organizations 0 0
Deposits with clearing organizations 0 0
Accounts receivable 0 0
Other assets – Memberships in clearing organizations 2,410 2,392
Total assets 2,410 2,392
Payable to brokers and dealers and clearing organizations 0 0
Total liabilities 0 0
Total Fair Value | Fair Value, Nonrecurring    
Fair Value of Financial Instruments    
Cash and restricted cash 235,577 318,495
Receivable from brokers and dealers and clearing organizations 1,646 0
Deposits with clearing organizations 25,990 20,523
Accounts receivable 155,426 129,937
Other assets – Memberships in clearing organizations 2,410 2,392
Total assets 421,049 471,347
Payable to brokers and dealers and clearing organizations 1,644 0
Total liabilities $ 1,644 $ 0