Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Nov. 08, 2018
Entity Information [Line Items]
Entity Registrant Name	Virtu Financial, Inc.
Entity Central Index Key	0001592386
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Small Business	false
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Class A
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		106,145,686
Class C
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		14,001,131
Class D
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		69,091,740