Parent Company - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	4 Months Ended	9 Months Ended	12 Months Ended			20 Months Ended
	Apr. 15, 2015	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016
Cash flows from operating activities
Net income	$ 83,147	$ 114,343	$ 158,340	$ 197,490	$ 190,057
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred taxes			13,313	3,985
Net cash provided by operating activities			239,599	260,280	272,699
Cash flows from investing activities
Cash flows used in investing activities			(59,017)	(24,299)	(36,159)
Cash flows from financing activities
Distribution to members				(130,000)	(140,652)
Distribution from Virtu Financial to non-controlling interest			(162,969)	(81,377)
Dividends			(37,759)	(17,362)		$ (20,000)
Proceeds from issuance				327,366
Purchase of treasury stock			(4,539)	(3,819)
Repurchase of Virtu Financial Units and corresponding number of Class A and C Common Stock			(98)	(277,153)
Issuance of common stock, net of offering costs			16,677	7,782
Repurchase of Virtu Financial Units and corresponding number of Class A and C common stock in connection with secondary offering			(17,383)	(8,805)
Net cash used in financing activities			(161,237)	(144,355)	(221,654)
Supplementary disclosure of cash flow information
Tax receivable agreement described in Note 4			545	(21,854)
Discount on issuance of senior secured credit facility			1,350			1,350
Taxes paid			16,175	12,875	3,764
Virtu Financial, Inc.
Cash flows from operating activities
Net income			32,980	104,034	190,057
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in income of subsidiary, net of tax			157,975	(18,237)	(24,469)
Deferred taxes			13,197	3,392
Changes in operating assets and liabilities			(4,012)	5,900	(14,056)
Net cash provided by operating activities			200,140	95,089	151,532
Cash flows from investing activities
Investment in subsidiaries, equity basis			24,893	64,624	15,953
Cash flows used in investing activities			24,893	64,624	15,953
Cash flows from financing activities
Distribution to members				(130,000)	(140,652)
Distribution from Virtu Financial to non-controlling interest		(162,969)		(81,377)
Proceeds from issuance				327,366
Purchase of treasury stock			(4,539)	(3,819)
Repurchase of Virtu Financial Units and corresponding number of Class A and C Common Stock				(277,153)
Issuance of common stock, net of offering costs			16,677	7,782
Repurchase of Virtu Financial Units and corresponding number of Class A and C common stock in connection with secondary offering			(17,383)	(8,805)
Net cash used in financing activities			(208,071)	(185,465)	(141,568)
Net increase (decrease) in cash			16,962	(25,752)	25,917
Cash, beginning of period	$ 25,939		187	25,939	22
Cash, end of period		$ 187	17,149	187	25,939	17,149
Supplementary disclosure of cash flow information
Tax receivable agreement described in Note 4				(21,854)
Discount on issuance of senior secured credit facility			1,350			$ 1,350
Taxes paid			8,813	5,615
Class A | Virtu Financial, Inc.
Cash flows from financing activities
Dividends			(37,759)	(17,362)
Class C | Virtu Financial, Inc.
Cash flows from financing activities
Repurchase of Virtu Financial Units and corresponding number of Class A and C Common Stock			(98)
Class A-2
Cash flows from financing activities
Payments on repurchase of non-voting common interest			(2,000)	(2,097)	(916)
Supplementary disclosure of cash flow information
Repurchase of interests					(6,000)
Class A-2 | Virtu Financial, Inc.
Cash flows from financing activities
Payments on repurchase of non-voting common interest			$ (2,000)	$ (2,097)	(916)
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
Payments on repurchase of non-voting common interest					(3,048)
Class A-2 | Temasek Member | Virtu Financial, Inc.
Cash flows from financing activities
Proceeds from issuance					3,048
Payments on repurchase of non-voting common interest					$ (3,048)