Earnings Per Share - Reconciliation (Details) - USD ($) $ in Thousands	4 Months Ended	9 Months Ended	12 Months Ended
	Apr. 15, 2015	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of net income before minority interest to net income available for common stockholders
Income before income taxes and non-controlling interest			$ 215,929	$ 193,558	$ 187,600
Provision for income taxes			18,439	3,501	5,397
Net income	$ 83,147	$ 114,343	197,490	$ 190,057	$ 182,203
Noncontrolling interest subsequent to April 15, 2015		$ (93,456)	(176,603)
Net income available for common stockholders			$ 20,887
Virtu Financial
Ownership interest (as a percent)		27.50%	27.50%
Reconciliation of net income before minority interest to net income available for common stockholders
Net income allocable to members of Virtu Financial (for the period January 1, 2015 through April 15, 2015)	$ (83,147)