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Revenues from Contracts with Customers (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Disaggregation of Revenue [Line Items]      
Total revenue $ 815,053 $ 147,287  
Receivables related to revenue from contracts with customers 5,600   $ 7,100
Market Making      
Disaggregation of Revenue [Line Items]      
Revenues from contract with customers 8,501    
Other sources of revenue 424,035    
Total revenue 432,536 144,448  
Market Making | Services transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Total revenue 432,536    
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 8,501    
Market Making | Technology services      
Disaggregation of Revenue [Line Items]      
Revenues from contract with customers 0    
Execution Services      
Disaggregation of Revenue [Line Items]      
Revenues from contract with customers 45,343    
Other sources of revenue 338,436    
Total revenue 383,779 2,779  
Execution Services | Services transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Total revenue 381,444    
Execution Services | Services transferred over time      
Disaggregation of Revenue [Line Items]      
Total revenue 2,335    
Execution Services | Commissions, net      
Disaggregation of Revenue [Line Items]      
Revenues from contract with customers 43,008    
Execution Services | Technology services      
Disaggregation of Revenue [Line Items]      
Revenues from contract with customers 2,335    
Corporate      
Disaggregation of Revenue [Line Items]      
Revenues from contract with customers 0    
Other sources of revenue (1,262)    
Total revenue (1,262) $ 60  
Corporate | Services transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Total revenue (1,262)    
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 | Technology services      
Disaggregation of Revenue [Line Items]      
Revenues from contract with customers $ 0