Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Total Virtu Financial Inc. Stockholders' Equity	Common Stock Class A	Common Stock Class C	Common Stock Class D	Treasury Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)	Non-Controlling Interest
Balance at beginning period (in shares) at Dec. 31, 2015			38,379,858	20,976,598	79,610,490	169,649
Balance at beginning of period at Dec. 31, 2015	$ 557,870	$ 130,708	$ 0	$ 0	$ 1	$ (3,819)	$ 130,902	$ 3,525	$ 99	$ 427,162
Increase (decrease) in stockholder's/members' equity
Share based compensation (in shares)			953,054	(58,070)
Share based compensation	24,893	24,893					24,893
Repurchase of Class C common stock (in shares)				(4,153)
Repurchase of Class C common stock	(98)	(98)					(98)
Treasury stock purchases (in shares)						(283,417)
Treasury stock purchases	(4,539)	(4,539)				$ (4,539)
Net income	158,340	32,980						32,980		125,360
Foreign exchange translation adjustment	(1,165)	(351)							(351)	(814)
Distribution from Virtu Financial to non-controlling interest	(162,969)									(162,969)
Dividends	(37,759)	(37,759)						(37,759)
Issuance of common stock in connection with secondary offering, net of offering costs (in shares)			1,103,668
Issuance of common stock in connection with secondary offering, net of offering costs	16,677	16,677					16,677
Repurchase of Virtu Financial Units and corresponding number of Class C common stock in connection with secondary offering (in shares)				(1,103,668)
Repurchase of Virtu Financial Units and corresponding number of Class C common stock in connection with secondary offering	(17,383)	(17,383)					(17,383)
Issuance of tax receivable agreements in connection with secondary offering	545	545					545
Balance at end of period at Dec. 31, 2016	534,412	145,673	$ 0	$ 0	$ 1	$ (8,358)	155,536	(1,254)	(252)	388,739
Balance at end of period (in shares) at Dec. 31, 2016			40,436,580	19,810,707	79,610,490	453,066
Increase (decrease) in stockholder's/members' equity
Share based compensation (in shares)			546,265	(34,019)
Share based compensation	16,846	16,846					16,846
Repurchase of Class C common stock (in shares)				(540,686)
Repurchase of Class C common stock	(9,143)	(9,143)					(9,143)
Treasury stock purchases (in shares)						(163,857)
Treasury stock purchases	(2,683)	(2,683)				$ (2,683)
Net income	18,898	2,939						2,939		15,959
Foreign exchange translation adjustment	9,117	3,243							3,243	5,874
Distribution from Virtu Financial to non-controlling interest	(89,563)									(89,563)
Dividends	(63,814)	(63,814)						(63,814)
Issuance of Class A common stock (in shares)			48,076,924
Issuance of Class A common stock	735,974	735,974	$ 1				735,973
Issuance of common stock in connection with employee exchanges (in shares)			1,355,763
Repurchase of Virtu Financial Units and corresponding number of Class C common stock in connection with employee exchanges (in shares)				(1,355,763)
Issuance of tax receivable agreements in connection with employee exchange	1,534	1,534					1,534
Balance at end of period at Dec. 31, 2017	1,151,578	830,569	$ 1	$ 0	$ 1	$ (11,041)	900,746	(62,129)	2,991	321,009
Balance at end of period (in shares) at Dec. 31, 2017			90,415,532	17,880,239	79,610,490	(616,923)
Increase (decrease) in stockholder's/members' equity
Share based compensation (in shares)			1,027,861
Share based compensation	34,909	34,909					34,909
Repurchase of Class C common stock (in shares)				(210,891)
Repurchase of Class C common stock	(8,216)	(8,216)						(8,216)
Treasury stock purchases (in shares)			(1,007,230)			(1,561,848)
Treasury stock purchases	(66,218)	(66,218)				$ (43,964)		(22,254)
Stock option exercised (in shares)			4,080,673
Stock option exercised	76,754	76,754					76,754
Net income	620,192	289,441						289,441		330,751
Foreign exchange translation adjustment	(5,127)	(3,073)							(3,073)	(2,054)
Distribution from Virtu Financial to non-controlling interest	(206,903)									(206,903)
Dividends	(100,329)	(100,329)						(100,329)
Issuance of common stock in connection with secondary offering, net of offering costs (in shares)			10,518,750		(10,518,750)
Issuance of common stock in connection with secondary offering, net of offering costs	(950)	(950)					(950)
Issuance of common stock in connection with employee exchanges (in shares)			3,919,462
Repurchase of Virtu Financial Units and corresponding number of Class C common stock in connection with employee exchanges (in shares)				(3,919,462)
Issuance of tax receivable agreements in connection with employee exchange	(991)	(991)					(991)
Balance at end of period at Dec. 31, 2018	$ 1,494,699	$ 1,051,896	$ 1	$ 0	$ 1	$ (55,005)	$ 1,010,468	$ 96,513	$ (82)	$ 442,803
Balance at end of period (in shares) at Dec. 31, 2018			108,955,048	13,749,886	69,091,740	(2,178,771)