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

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

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

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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.

+ 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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Represents the number of broker-dealer subsidiaries of the entity.

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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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No definition available.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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Regulatory Requirement (Details) $ in Thousands	12 Months Ended
Regulatory Requirement (Details) $ in Thousands	Dec. 31, 2016 USD ($) subsidiary item	Dec. 31, 2017 subsidiary	Dec. 31, 2017 item	Dec. 31, 2017	Dec. 31, 2017 USD ($)
Regulatory Requirement
Number of broker-dealer subsidiaries	3	3	3
Virtu Americas LLC
Regulatory Requirement
Regulatory Capital					$ 379,875
Regulatory Capital Requirement					1,000
Excess Regulatory Capital					378,875
Virtu Financial BD LLC
Regulatory Requirement
Regulatory Capital	$ 74,467				40,683
Regulatory Capital Requirement	1,000				1,000
Excess Regulatory Capital	73,467				39,683
VFCM
Regulatory Requirement
Regulatory Capital	10,830				8,308
Regulatory Capital Requirement	2,886				5,114
Excess Regulatory Capital	7,944				3,194
Minimum capital required to be maintained in connection with the operation of the Company's DMM business	$ 1,900				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 \| item	60