Consolidated Statements of Changes in Equity - USD ($)	Common Stock Class A	Common Stock Class C	Common Stock Class D	Treasury Stock	Additional Paid-in Capital	Capital Units Class A-1	Capital Units Class A-2	Retained Earnings (Accumulated Deficit).	Accumulated Other Comprehensive Income (Loss)	Total Stockholders' Equity	Noncontrolling Interest	Class A	Class C	Class D	Total
Balance at Dec. 31, 2014						$ 19,648,000	$ 287,705,000	$ (91,383,000)	$ (3,705,000)	$ 212,265,000					$ 212,265,000
Balance (in shares) at Dec. 31, 2014						1,964,826	99,855,666
Increase (decrease) in stockholder's/members' equity
Share based compensation							$ 438,000			438,000					438,000
Share based compensation (in shares)							6,418
Repurchase of interests							$ (97,000)			(97,000)					(97,000)
Repurchase of interests (in shares)							(13,495)
Dividends								(130,000,000)		(130,000,000)					(130,000,000)
Net income (loss)								83,147,000		83,147,000					83,147,000
Foreign exchange translation adjustment									(4,633,000)	(4,633,000)					(4,633,000)
Reorganization of equity structure		$ 36,746,041	$ 1,000		$ 63,261,000	$ (19,648,000)	$ (288,046,000)	138,236,000	8,338,000	(97,858,000)	$ 392,291,000				294,433,000
Reorganization of equity structure (in shares)	18,763,664		79,610,490
Reorganization of equity structure (in shares)						(1,964,826)	(99,848,589)
Balance at Apr. 15, 2015			$ 1,000		63,261,000
Balance at Apr. 15, 2015										63,262,000	392,291,000				455,553,000
Balance (in shares) at Apr. 15, 2015	18,763,664	36,746,041	79,610,490
Balance at Dec. 31, 2014						$ 19,648,000	$ 287,705,000	(91,383,000)	(3,705,000)	212,265,000					212,265,000
Balance (in shares) at Dec. 31, 2014						1,964,826	99,855,666
Increase (decrease) in stockholder's/members' equity
Net income (loss)															197,490,000
Foreign exchange translation adjustment															(4,255,000)
Balance at Dec. 31, 2015			$ 1,000		130,902,000			3,525,000	99,000	130,708,000	427,162,000				557,870,000
Balance (in shares) at Dec. 31, 2015	38,379,858	20,976,598	79,610,490
Treasury stock at Dec. 31, 2015				$ (3,819,000)						(3,819,000)					(3,819,000)
Treasury stock (in shares) at Dec. 31, 2015				(169,649)
Balance at Apr. 15, 2015			$ 1,000		63,261,000
Balance at Apr. 15, 2015										63,262,000	392,291,000				455,553,000
Balance (in shares) at Apr. 15, 2015	18,763,664	36,746,041	79,610,490
Increase (decrease) in stockholder's/members' equity
Share based compensation					19,278,000					19,278,000					19,278,000
Share based compensation (in shares)	576,693
Repurchase of interests		$ (12,214,224)			(277,153,000)					(277,153,000)					(277,153,000)
Repurchase of interests (in shares)	(3,470,724)
Dividends								(17,362,000)		(17,362,000)					(17,362,000)
Net income (loss)								20,887,000		20,887,000	93,456,000				114,343,000
Foreign exchange translation adjustment									99,000	99,000	279,000				378,000
Issuance of Common Stock, net of offering costs					327,366,000					327,366,000					327,366,000
Issuance of Common Stock, net of offering costs (in shares)	19,012,112	(3,498,113)
Issuance of Common Stock in connection with secondary offering, net of offering costs					7,782,000					7,782,000					7,782,000
Issuance of common stock (in shares)	3,498,113
Repurchase of units and corresponding number of common stock in connection with secondary offering					(8,805,000)					(8,805,000)					(8,805,000)
Share based compensation vested upon IPO					44,908,000					44,908,000					44,908,000
Adjustments for changes in proportionate ownership in Virtu Financial					(22,513,000)					(22,513,000)	22,513,000
Issuance of tax receivable agreements in connection with secondary offering					(23,041,000)					(23,041,000)					(23,041,000)
Repurchase of common stock		$ (57,106)			(1,368,000)					(1,368,000)					(1,368,000)
Treasury stock purchases (in shares)				(169,649)
Distribution from Virtu Financial to non-controlling interest											(81,377,000)				(81,377,000)
Issuance of tax receivable agreements in connection with secondary offering					(1,187,000)					(1,187,000)					(1,187,000)
Balance at Dec. 31, 2015			$ 1,000		130,902,000			3,525,000	99,000	130,708,000	427,162,000				557,870,000
Balance (in shares) at Dec. 31, 2015	38,379,858	20,976,598	79,610,490
Treasury stock at Dec. 31, 2015				$ (3,819,000)						(3,819,000)					(3,819,000)
Treasury stock (in shares) at Dec. 31, 2015				(169,649)
Increase (decrease) in stockholder's/members' equity
Share based compensation					24,893,000					24,893,000					24,893,000
Share based compensation (in shares)	953,054	(58,070)
Dividends								(37,759,000)		(37,759,000)					(37,759,000)
Net income (loss)								32,980,000		32,980,000	125,360,000				158,340,000
Foreign exchange translation adjustment									(351,000)	(351,000)	(814,000)				(1,165,000)
Issuance of Common Stock in connection with secondary offering, net of offering costs					16,677,000					16,677,000					16,677,000
Issuance of common stock (in shares)	1,103,668
Repurchase of units and corresponding number of common stock in connection with secondary offering					(17,383,000)					(17,383,000)					(17,383,000)
Repurchase of units and corresponding number of common stock in connection with secondary offering (in shares)		(1,103,668)
Issuance of tax receivable agreements in connection with secondary offering					(545,000)					(545,000)					(545,000)
Repurchase of common stock					(98,000)					(98,000)					(98,000)
Repurchase of common stock (in shares)		(4,153)
Treasury stock purchases				$ (4,539,000)						(4,539,000)					(4,539,000)
Treasury stock purchases (in shares)				(283,417)
Distribution from Virtu Financial to non-controlling interest											(162,969,000)				(162,969,000)
Balance at Dec. 31, 2016															145,673,000
Balance at Dec. 31, 2016			$ 1,000		155,536,000			(1,254,000)	(252,000)	145,673,000	388,739,000				534,412,000
Balance (in shares) at Dec. 31, 2016	40,436,580	19,810,707	79,610,490									39,983,514	19,810,707	79,610,490
Treasury stock at Dec. 31, 2016				$ (8,358,000)											$ (8,358,000)
Treasury stock (in shares) at Dec. 31, 2016				(453,066)											(453,066)
Increase (decrease) in stockholder's/members' equity
Share based compensation		$ (34,019)			16,846,000					16,846,000					$ 16,846,000
Share based compensation (in shares)	546,265
Repurchase of interests					(9,143,000)					(9,143,000)					(9,143,000)
Dividends								(63,814,000)		(63,814,000)					(63,814,000)
Net income (loss)								2,939,000		2,939,000	15,959,000				18,898,000
Foreign exchange translation adjustment									3,243,000	3,243,000	5,874,000				9,117,000
Issuance of Common Stock, net of offering costs	$ 1,000				735,973,000					735,974,000					735,974,000
Issuance of Common Stock, net of offering costs (in shares)	48,076,924
Issuance of common stock (in shares)	1,355,763
Repurchase of units and corresponding number of common stock in connection with secondary offering (in shares)		(1,355,763)
Issuance of tax receivable agreements in connection with secondary offering					1,534,000					1,534,000					1,534,000
Repurchase of common stock (in shares)		(540,686)
Treasury stock purchases				$ (2,683,000)						(2,683,000)					(2,683,000)
Treasury stock purchases (in shares)				(163,857)
Distribution from Virtu Financial to non-controlling interest											(89,563,000)				(89,563,000)
Balance at Dec. 31, 2017	$ 1,000		$ 1,000		$ 900,746,000			$ (62,129,000)	$ 2,991,000	$ 830,569,000	$ 321,009,000				1,151,578,000
Balance (in shares) at Dec. 31, 2017	90,415,532	17,880,239	79,610,490
Balance at Dec. 31, 2017															830,569,000
Balance at Dec. 31, 2017															1,151,578,000
Balance (in shares) at Dec. 31, 2017												89,798,609	17,880,239	79,610,490
Treasury stock at Dec. 31, 2017				$ (11,041,000)											$ (11,041,000)
Treasury stock (in shares) at Dec. 31, 2017				(616,923)											(616,923)