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Regulatory Requirement (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) trading_unit subsidiary	Dec. 31, 2017 USD ($)	Nov. 03, 2017 broker_dealer
Entity Information [Line Items]
Number of broker-dealer subsidiaries	3		3
Regulatory Capital	$ 1,000
Virtu Americas LLC
Entity Information [Line Items]
Regulatory Capital	411,168	$ 379,875
Minimum Net Capital Required	1,000	1,000
Excess Regulatory Capital	410,168	378,875
Virtu Financial BD LLC
Entity Information [Line Items]
Regulatory Capital	88,280	40,683
Minimum Net Capital Required	1,000	1,000
Excess Regulatory Capital	87,280	39,683
Virtu Financial Capital Markets LLC
Entity Information [Line Items]
Regulatory Capital	8,563	8,308
Minimum Net Capital Required	4,696	5,114
Excess Regulatory Capital	3,867	3,194
Minimum capital required to be maintained in connection with the operation of the Company's DMM business	3,700	$ 4,100
Required amount under exchange rules	$ 1,000
Required amount under exchange rules as percentage of market value	15.00%
Number of trading units whose market value is considered to calculate required net capital under exchange act | trading_unit	60

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The amount of net capital in excess of the minimum required net capital.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Rule 15c3-1
-Number 240
-Section 15c3-1

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Amount of minimum net capital required to be maintained to engage in securities transactions.

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Minimum amount of net capital required to be maintained by the entity to engage in securities transactions.

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Net capital is equal to the net worth of the broker dealer, less certain items such as exchange memberships, carrying value of securities not readily marketable, haircuts on marketable securities in proprietary accounts, furniture and equipment and other illiquid assets as defined.

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Represents the number of trading units whose market value is considered to calculate required net capital under exchange act.

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Represents the amount of minimum net capital required to be maintained by the entity under the exchange act.

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Percentage of net capital required to be maintained under minimum financial requirements, pursuant to the exchange Act.

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