Tax Receivable Agreements (Details) - USD ($) $ in Thousands		12 Months Ended
	Apr. 15, 2015	Dec. 31, 2015	Sep. 30, 2016
Tax Receivable Agreements
Payment on applicable cash tax savings (as a percent)	85.00%
First payment due after filing of company's tax return		120 days
Deferred tax assets related to exchange of units	$ 205,800
Payments to Virtu Post-IPO Members and Investor Post-IPO Stockholders	226,000
Minimum tax receivable agreement obligation over the agreed period	7,400
Maximum tax receivable agreement obligation over the agreed period	$ 20,100
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.	$ 20,200
Deferred tax asset recorded in connection with a stock offering			$ 9,300
Amount of payment liability pursuant to tax receivable agreements			7,600
Increase in additional paid-in capital related to tax receivable agreements			1,700
Deferred tax assets			187,400
Tax receivable agreement obligations		$ 218,399	$ 226,048