Capital Structure - After Reorganization and IPO (Details) $ / shares in Units, $ in Thousands				5 Months Ended	8 Months Ended	12 Months Ended
	Apr. 21, 2015 USD ($) shares	Apr. 16, 2015 $ / shares shares	Apr. 15, 2015 item shares	Nov. 20, 2015 USD ($)	Dec. 31, 2015 $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 $ / shares shares
Number of affiliates of the founder member | item			3
Number of entities | item			2
Number of entities managed by the founding member | item			1
Number of founding members liquidating and distributing equity interests | item			2
Number of classes of common stock | item			4
Payments of dividends | $						$ 17,362
Underwriting discount and commissions | $	$ 25,200
Net proceeds from IPO contributed to VF | $	58,800
Options outstanding (in shares)					8,994,000	8,994,000
Maximum
Remaining dividends payable | $				$ 35,000
Virtu Financial
Ownership interest (as a percent)					27.50%	27.50%
Virtu Financial
Payments of dividends | $				$ 15,000
Other offering costs | $	8,600
Silver Lake Post-IPO
Payments to purchase shares of common stock and common units | $	$ 277,200
Non-qualified stock options
Grants (in shares)						9,228,000
Non-qualified stock options | 2015 Management Incentive Plan
Grants (in shares)	9,228,000
Vesting period	4 years
Expiration period	10 years
Restricted stock units
Granted (in shares)						984,466
Restricted stock units | 2015 Management Incentive Plan
Vesting period					4 years
Granted (in shares)					984,466
Class A
Number of shares of stock issued		19,012,112
Common stock, par value (in dollars per share) | $ / shares		$ 0.00001			$ 0.00001	$ 0.00001	$ 0
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
Sale of VFI's common stock					38,379,858	38,379,858	0
Gross proceeds from offering | $	$ 361,200
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
Sale of VFI's common stock					38,379,858	38,379,858	0
Payments of dividends | $						$ 17,362
Class A | Silver Lake Post-IPO
Purchase of common stock (in shares)	3,470,724
Class B
Common stock, par value (in dollars per share) | $ / shares					$ 0.00001	$ 0.00001	$ 0
Sale of VFI's common stock					0	0	0
Class B | Virtu Financial, Inc.
Common stock, par value (in dollars per share) | $ / shares					$ 0.00001	$ 0.00001
Sale of VFI's common stock					0	0	0
Class C
Common stock, par value (in dollars per share) | $ / shares					$ 0.00001	$ 0.00001	$ 0
Sale of VFI's common stock					20,976,598	20,976,598	0
Class C | Virtu Employee Holdco, Employee Trust, Management Members and other Virtu Post IPO Members
Purchase of common stock (in shares)			36,746,041
Class C | Virtu Financial, Inc.
Common stock, par value (in dollars per share) | $ / shares					$ 0.00001	$ 0.00001
Sale of VFI's common stock					20,976,598	20,976,598	0
Class C | Silver Lake Post-IPO
Purchase of common stock (in shares)	4,862,609
Class C | Virtu Post-IPO
Purchase of common stock (in shares)	12,214,224
Class C | Certain employees
Purchase of common stock (in shares)	7,351,615
Class D
Common stock, par value (in dollars per share) | $ / shares					$ 0.00001	$ 0.00001	$ 0
Sale of VFI's common stock					79,610,490	79,610,490	0
Class D | TJMT Holdings LLC
Purchase of common stock (in shares)			79,610,490
Class D | Virtu Financial, Inc.
Common stock, par value (in dollars per share) | $ / shares					$ 0.00001	$ 0.00001
Sale of VFI's common stock					79,610,490	79,610,490
Class A common stock and Class C common stock
Number of votes provided to holders on all matters | item			1
Conversion of VFI's common stock			1
Class B common stock and Class D common stock
Number of votes provided to holders on all matters | item			10
Class A, B, C and D common stock
Common stock, par value (in dollars per share) | $ / shares		$ 0.00001