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Revenues from Contracts with Customers (Details) - USD ($)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Disaggregation of Revenue [Line Items]      
Revenues from contract with customers $ 75,147,000 $ 53,844,000  
Total revenue 362,991,000 815,053,000  
Receivables related to revenue from contracts with customers 49,600,000   $ 1,700,000
Impairment losses on receivables 0    
Deferred revenue related to contracts with customers 11,500,000    
Revenue recognized 8,000,000    
Services transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Total revenue 356,202,000    
Services transferred over time      
Disaggregation of Revenue [Line Items]      
Total revenue 6,789,000    
Commissions, net      
Disaggregation of Revenue [Line Items]      
Revenues from contract with customers 62,755,000    
Workflow technology      
Disaggregation of Revenue [Line Items]      
Revenues from contract with customers 8,872,000    
Analytics      
Disaggregation of Revenue [Line Items]      
Revenues from contract with customers 3,520,000    
Other sources of revenue      
Disaggregation of Revenue [Line Items]      
Total revenue 287,844,000    
Market Making      
Disaggregation of Revenue [Line Items]      
Revenues from contract with customers 5,000,000    
Total revenue 279,221,000 432,536,000  
Market Making | Services transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Total revenue 279,221,000    
Market Making | Services transferred over time      
Disaggregation of Revenue [Line Items]      
Total revenue 0    
Market Making | Commissions, net      
Disaggregation of Revenue [Line Items]      
Revenues from contract with customers 5,000,000    
Market Making | Workflow technology      
Disaggregation of Revenue [Line Items]      
Revenues from contract with customers 0    
Market Making | Analytics      
Disaggregation of Revenue [Line Items]      
Revenues from contract with customers 0    
Market Making | Other sources of revenue      
Disaggregation of Revenue [Line Items]      
Total revenue 274,221,000    
Execution Services      
Disaggregation of Revenue [Line Items]      
Revenues from contract with customers 70,147,000    
Total revenue 83,518,000 383,779,000  
Execution Services | Services transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Total revenue 76,729,000    
Execution Services | Services transferred over time      
Disaggregation of Revenue [Line Items]      
Total revenue 6,789,000    
Execution Services | Commissions, net      
Disaggregation of Revenue [Line Items]      
Revenues from contract with customers 57,755,000    
Execution Services | Workflow technology      
Disaggregation of Revenue [Line Items]      
Revenues from contract with customers 8,872,000    
Execution Services | Analytics      
Disaggregation of Revenue [Line Items]      
Revenues from contract with customers 3,520,000    
Execution Services | Other sources of revenue      
Disaggregation of Revenue [Line Items]      
Total revenue 13,371,000    
Corporate      
Disaggregation of Revenue [Line Items]      
Revenues from contract with customers 0    
Total revenue 252,000 $ (1,262,000)  
Corporate | Services transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Total revenue 252,000    
Corporate | Services transferred over time      
Disaggregation of Revenue [Line Items]      
Total revenue 0    
Corporate | Commissions, net      
Disaggregation of Revenue [Line Items]      
Revenues from contract with customers 0    
Corporate | Workflow technology      
Disaggregation of Revenue [Line Items]      
Revenues from contract with customers 0    
Corporate | Analytics      
Disaggregation of Revenue [Line Items]      
Revenues from contract with customers 0    
Corporate | Other sources of revenue      
Disaggregation of Revenue [Line Items]      
Total revenue $ 252,000