Parent Company - Condensed Statements of Cash Flows (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
Cash flows from operating activities
Net income	$ 83,147	$ 114,343	$ 197,490	$ 190,057	$ 182,203
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred taxes			3,985
Net cash provided by operating activities			260,280	272,699	259,361
Cash flows from investing activities
Cash flows used in investing activities			(24,299)	(36,159)	(32,016)
Cash flows from financing activities
Distribution to members through April 15, 2015			(130,000)	(140,652)	(433,400)
Distribution from Virtu Financial to non-controlling interest, after April 15, 2015			(81,377)
Dividends to Class A shareholders			(17,362)
Proceeds from issuance			327,366
Purchase of treasury stock			(3,819)
Repurchase of Virtu Financial Units and corresponding number of Class A and C Common Stock			(277,153)
Issuance of common stock in connection with secondary offering, net of offering costs			7,782
Repurchase of Virtu Financial Units and corresponding number of Class A and C common stock in connection with secondary offering			(8,805)
Net cash used in financing activities			(144,355)	(221,654)	(202,695)
Supplementary disclosure of cash flow information
Tax receivable agreement described in Note 4			(21,854)
Taxes paid			12,875	3,764	4,559
Virtu Financial, Inc.
Cash flows from operating activities
Net income			104,034	190,057	182,203
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in income of subsidiary, net of tax			(18,237)	(24,469)	244,854
Deferred taxes			3,392
Changes in operating assets and liabilities			5,900	(14,056)	(6,529)
Net cash provided by operating activities			95,089	151,532	420,528
Cash flows from investing activities
Investment in subsidiaries, equity basis			64,624	15,953	13,441
Cash flows used in investing activities			64,624	15,953	13,441
Cash flows from financing activities
Distribution to members through April 15, 2015	(130,000)			(140,652)	(433,400)
Distribution from Virtu Financial to non-controlling interest, after April 15, 2015		(81,377)
Proceeds from issuance			327,366
Purchase of treasury stock			(3,819)
Repurchase of Virtu Financial Units and corresponding number of Class A and C Common Stock			(277,153)
Issuance of common stock in connection with secondary offering, net of offering costs			7,782
Repurchase of Virtu Financial Units and corresponding number of Class A and C common stock in connection with secondary offering			(8,805)
Net cash used in financing activities			(185,465)	(141,568)	(433,973)
Net increase (decrease) in cash			(25,752)	25,917	(4)
Cash, beginning of period	$ 25,939		25,939	22	26
Cash, end of period		$ 187	187	25,939	22
Supplementary disclosure of cash flow information
Tax receivable agreement described in Note 4			(21,854)
Taxes paid			5,615
Class A | Virtu Financial, Inc.
Cash flows from financing activities
Dividends to Class A shareholders			(17,362)
Class A-2
Cash flows from financing activities
Repurchase of interests			(2,097)	(916)	(573)
Supplementary disclosure of cash flow information
Repurchase of interests				(6,000)
Class A-2 | Virtu Financial, Inc.
Cash flows from financing activities
Repurchase of interests			$ (2,097)	(916)	$ (573)
Supplementary disclosure of cash flow information
Repurchase of interests				(6,000)
Class A-2 | Temasek Member
Cash flows from financing activities
Proceeds from issuance				3,048
Repurchase of interests				(3,048)
Class A-2 | Temasek Member | Virtu Financial, Inc.
Cash flows from financing activities
Proceeds from issuance				3,048
Repurchase of interests				$ (3,048)