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, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of net income before minority interest to net income available for common stockholders
Income before income taxes and non-controlling interest			$ 179,591	$ 215,929	$ 193,558
Provision for income taxes			21,251	18,439	3,501
Net income	$ 83,147	$ 114,343	158,340	197,490	$ 190,057
Noncontrolling interest		$ (93,456)	(125,360)	(176,603)
Net income available for common stockholders			$ 32,980	$ 20,887
Virtu Financial
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)