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Regulatory Requirement - Narrative (Details)
 3 Months Ended
Mar. 31, 2019
USD ($)
broker_dealer
Nov. 03, 2017
broker_dealer
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Number of broker-dealer subsidiaries | broker_dealer 5 3
Virtu Financial Capital Markets LLC    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Minimum capital required to be maintained in connection with the operation of the Company's DMM business $ 1,150,000  
Required amount under exchange rules 1,000,000  
Required amount under exchange rules for every 0.1% NYSE transaction dollar volume $ 75,000  
Percentage of NYSE transaction dollar volume 0.10%  
VAL    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Cash in special reserve bank accounts for the benefit of customers $ 2,000,000  
Cash in reserve bank accounts for the benefit of proprietary accounts of brokers 1,000,000  
VITG    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Cash in special reserve bank accounts for the benefit of customers 7,400,000  
Cash in reserve bank accounts for the benefit of proprietary accounts of brokers $ 4,400,000