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Regulatory Requirement - Regulatory Capital and Capital Requirements (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Virtu Americas LLC
Entity Information [Line Items]
Regulatory Capital	$ 333,184	$ 381,211
Regulatory Capital Requirement	2,152	2,035
Excess Regulatory Capital	331,032	379,176
Virtu Financial BD LLC
Entity Information [Line Items]
Regulatory Capital	111,199	133,850
Regulatory Capital Requirement	1,000	1,000
Excess Regulatory Capital	110,199	132,850
Virtu Financial Capital Markets LLC
Entity Information [Line Items]
Regulatory Capital	9,277	9,457
Regulatory Capital Requirement	1,000	1,000
Excess Regulatory Capital	8,277	$ 8,457
Virtu ITG LLC
Entity Information [Line Items]
Regulatory Capital	58,270
Regulatory Capital Requirement	1,000
Excess Regulatory Capital	57,270
Virtu Alternet Securities LLC
Entity Information [Line Items]
Regulatory Capital	6,267
Regulatory Capital Requirement	100
Excess Regulatory Capital	6,167
Canada | Virtu ITG Canada Corp
Entity Information [Line Items]
Regulatory Capital	17,870
Regulatory Capital Requirement	187
Excess Regulatory Capital	17,683
Canada | TriAct Canada Marketplace LP
Entity Information [Line Items]
Regulatory Capital	2,028
Regulatory Capital Requirement	187
Excess Regulatory Capital	1,841
Canada | Virtu Financial Canada ULC
Entity Information [Line Items]
Regulatory Capital	2,598
Regulatory Capital Requirement	187
Excess Regulatory Capital	2,411
Ireland | Virtu ITG Europe Limited
Entity Information [Line Items]
Regulatory Capital	53,787
Regulatory Capital Requirement	32,768
Excess Regulatory Capital	21,019
Ireland | Virtu Financial Ireland Limited
Entity Information [Line Items]
Regulatory Capital	78,227
Regulatory Capital Requirement	29,919
Excess Regulatory Capital	48,308
United Kingdom | Virtu ITG UK Limited
Entity Information [Line Items]
Regulatory Capital	1,367
Regulatory Capital Requirement	975
Excess Regulatory Capital	392
United Kingdom | KCG Europe Limited
Entity Information [Line Items]
Regulatory Capital	50,443
Regulatory Capital Requirement	32,000
Excess Regulatory Capital	18,443
Asia Pacific | Virtu ITG Australia Limited
Entity Information [Line Items]
Regulatory Capital	27,601
Regulatory Capital Requirement	16,102
Excess Regulatory Capital	11,499
Asia Pacific | Virtu ITG Hong Kong Limited
Entity Information [Line Items]
Regulatory Capital	1,220
Regulatory Capital Requirement	579
Excess Regulatory Capital	641
Asia Pacific | Virtu ITG Singapore Pte Limited
Entity Information [Line Items]
Regulatory Capital	1,015
Regulatory Capital Requirement	74
Excess Regulatory Capital	$ 941

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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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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