Regulatory Requirement - Regulatory Capital and Capital Requirements (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Virtu Americas LLC
Public Utilities, General Disclosures [Line Items]
Regulatory Capital	$ 257,452	$ 381,211
Regulatory Capital Requirement	2,571	2,035
Excess Regulatory Capital	254,881	379,176
Virtu Financial BD LLC
Public Utilities, General Disclosures [Line Items]
Regulatory Capital	30,317	133,850
Regulatory Capital Requirement	1,000	1,000
Excess Regulatory Capital	29,317	132,850
Virtu Financial Capital Markets LLC
Public Utilities, General Disclosures [Line Items]
Regulatory Capital	3,710	9,457
Regulatory Capital Requirement	1,000	1,000
Excess Regulatory Capital	2,710	$ 8,457
Virtu ITG LLC
Public Utilities, General Disclosures [Line Items]
Regulatory Capital	66,069
Regulatory Capital Requirement	1,000
Excess Regulatory Capital	65,069
Virtu Alternet Securities LLC
Public Utilities, General Disclosures [Line Items]
Regulatory Capital	1,931
Regulatory Capital Requirement	100
Excess Regulatory Capital	1,831
Virtu ITG Canada Corp
Public Utilities, General Disclosures [Line Items]
Deposit funds for trade	400
Virtu ITG Canada Corp | Canada
Public Utilities, General Disclosures [Line Items]
Regulatory Capital	13,029
Regulatory Capital Requirement	193
Excess Regulatory Capital	12,836
TriAct Canada Marketplace LP | Canada
Public Utilities, General Disclosures [Line Items]
Regulatory Capital	2,538
Regulatory Capital Requirement	193
Excess Regulatory Capital	2,345
Virtu Financial Canada ULC | Canada
Public Utilities, General Disclosures [Line Items]
Regulatory Capital	2,459
Regulatory Capital Requirement	193
Excess Regulatory Capital	2,266
Virtu ITG Europe Limited
Public Utilities, General Disclosures [Line Items]
Deposit funds for trade	1,200
Virtu ITG Europe Limited | Ireland
Public Utilities, General Disclosures [Line Items]
Regulatory Capital	54,129
Regulatory Capital Requirement	32,484
Excess Regulatory Capital	21,645
Virtu Financial Ireland Limited | Ireland
Public Utilities, General Disclosures [Line Items]
Regulatory Capital	78,385
Regulatory Capital Requirement	43,233
Excess Regulatory Capital	35,152
Virtu ITG UK Limited | United Kingdom
Public Utilities, General Disclosures [Line Items]
Regulatory Capital	1,378
Regulatory Capital Requirement	991
Excess Regulatory Capital	387
Virtu ITG Australia Limited | Asia Pacific
Public Utilities, General Disclosures [Line Items]
Regulatory Capital	24,574
Regulatory Capital Requirement	8,451
Excess Regulatory Capital	16,123
Virtu ITG Hong Kong Limited
Public Utilities, General Disclosures [Line Items]
Capital settlement	30
Virtu ITG Hong Kong Limited | Asia Pacific
Public Utilities, General Disclosures [Line Items]
Regulatory Capital	3,805
Regulatory Capital Requirement	539
Excess Regulatory Capital	3,266
Virtu ITG Singapore Pte Limited | Asia Pacific
Public Utilities, General Disclosures [Line Items]
Regulatory Capital	1,179
Regulatory Capital Requirement	72
Excess Regulatory Capital	$ 1,107