Tax Receivable Agreements (Details) $ in Thousands		12 Months Ended
	Apr. 15, 2015 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2016 USD ($)
Tax Receivable Agreements
Payment on applicable cash tax savings (as a percent)	85
First payment due after filing of company's tax return		120 days
Deferred tax assets related to exchange of units	$ 196,500
Payments to Virtu Post-IPO Members and Investor Post-IPO Stockholders	218,400
Minimum tax receivable agreement obligation over the agreed period	8,100
Maximum tax receivable agreement obligation over the agreed period	$ 16,800
Period over which the obligations are to be settled	15 years
Reduction of paid-in capital for the difference between TRA liability and related deferred tax asset.	$ 21,900
Deferred tax assets			$ 183,200
Tax receivable agreement obligations		$ 218,399	$ 218,399