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Regulatory Requirement - Narrative (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
broker_dealer
Dec. 31, 2017
USD ($)
Nov. 03, 2017
broker_dealer
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Regulatory capital $ 1,000,000.0    
Number of broker-dealer subsidiaries | broker_dealer 3   3
Virtu Financial Capital Markets LLC      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Regulatory capital $ 9,457,000 $ 8,308,000  
Minimum capital required to be maintained in connection with the operation of the Company's DMM business 1,000,000 $ 4,100,000  
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%