Capital Structure (Details) $ / shares in Units, $ in Thousands			1 Months Ended		12 Months Ended		20 Months Ended
	Apr. 21, 2015 USD ($) $ / shares shares	Apr. 15, 2015 shares	Sep. 30, 2016 $ / shares shares	Nov. 30, 2015 employee $ / shares shares	Dec. 31, 2016 USD ($) Vote item $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) Vote $ / shares shares	Dec. 31, 2016 Vote $ / shares shares
Number of classes of common stock | item					4
Payments of dividends | $					$ 37,759	$ 17,362	$ 20,000
Distributions authorized prior to reorganization transactions | $	$ 50,000
Virtu Financial
Ownership interest (as a percent)					29.60%		29.60%	29.60%
Non-qualified stock options | 2015 Management Incentive Plan
Vesting period	4 years
Options outstanding (in shares)					8,234,000	8,994,000	8,234,000	8,234,000
Expiration period	10 years
Restricted stock units | 2015 Management Incentive Plan
Granted (in shares)					1,019,148	984,466
Restricted stock units | 2015 Management Incentive Plan | Maximum
Vesting period								4 years
Class A
Number of shares of stock issued	19,012,112	16,532,272
Common stock, par value (in dollars per share) | $ / shares	$ 0.00001				$ 0.00001	$ 0.00001	$ 0.00001	$ 0.00001
Common stock sold in connection with full exercise of the option to purchase additional shares granted to underwriters (in shares)	2,479,840
Common stock sold in connection with full exercise of the option to purchase additional shares granted to underwriters, at a price to public (in dollars per share) | $ / shares	$ 19.00
Common stock shares issued					40,436,580	38,379,858	40,436,580	40,436,580
Common stock, outstanding					39,983,514	38,210,209	39,983,514	39,983,514
Number of non-executive employees the Company purchased common units from | employee				1
Common stock offered for sale (in shares)			1,103,668	397,534
Price of stock (in dollars per share) | $ / shares			$ 15.75
Commission deducted from the price at which shares were offered to the public (in dollars per share) | $ / shares			$ 0.10
Class A | 2015 Management Incentive Plan
Number of shares of stock authorized	12,000,000
Class A | Virtu Financial, Inc.
Common stock, par value (in dollars per share) | $ / shares					$ 0.00001		$ 0.00001	$ 0.00001
Common stock shares issued					40,436,580	38,379,858	40,436,580	40,436,580
Common stock, outstanding					39,983,514	38,210,209	39,983,514	39,983,514
Payments of dividends | $					$ 37,759	$ 17,362
Class A | Silver Lake Post-IPO
Common stock offered for sale (in shares)				6,075,837
Class A | Virtu Financial Inc And Silver Lake Partners
Common stock offered for sale (in shares)				6,473,371
Price of stock (in dollars per share) | $ / shares				$ 22.15
Class B
Common stock, par value (in dollars per share) | $ / shares					$ 0.00001	$ 0.00001	$ 0.00001	$ 0.00001
Common stock shares issued					0	0	0	0
Common stock, outstanding					0	0	0	0
Class B | Virtu Financial, Inc.
Common stock, par value (in dollars per share) | $ / shares					$ 0.00001		$ 0.00001	$ 0.00001
Common stock shares issued					0	0	0	0
Common stock, outstanding					0	0	0	0
Class C
Common stock, par value (in dollars per share) | $ / shares					$ 0.00001	$ 0.00001	$ 0.00001	$ 0.00001
Common stock shares issued					19,810,707	20,976,598	19,810,707	19,810,707
Common stock, outstanding					19,810,707	20,976,598	19,810,707	19,810,707
Class C | Virtu Financial, Inc.
Common stock, par value (in dollars per share) | $ / shares					$ 0.00001		$ 0.00001	$ 0.00001
Common stock shares issued					19,810,707		19,810,707	19,810,707
Common stock, outstanding					19,810,707	20,976,598	19,810,707	19,810,707
Class D
Common stock, par value (in dollars per share) | $ / shares					$ 0.00001	$ 0.00001	$ 0.00001	$ 0.00001
Common stock shares issued					79,610,490	79,610,490	79,610,490	79,610,490
Common stock, outstanding					79,610,490	79,610,490	79,610,490	79,610,490
Class D | Virtu Financial, Inc.
Common stock, par value (in dollars per share) | $ / shares					$ 0.00001		$ 0.00001	$ 0.00001
Common stock shares issued					79,610,490	79,610,490	79,610,490	79,610,490
Common stock, outstanding					79,610,490	79,610,490	79,610,490	79,610,490
Class A common stock and Class C common stock
Number of votes provided to holders on all matters | Vote					1		1	1
Class B common stock and Class D common stock
Number of votes provided to holders on all matters | Vote					10		10	10