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Financial Assets and Liabilities - Netting of Certain Financial Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Securities borrowed
Gross Amounts of Recognized Assets	$ 1,282,867	$ 1,399,684
Net Amounts of Assets Presented in the Condensed Consolidated Statement of Financial Condition	1,282,867	1,399,684
Gross Amounts Not Offset In the Condensed Consolidated Statement of Financial Condition
Financial Instruments	(1,246,913)	(1,361,635)
Cash Collateral Received	(698)	(8,822)
Net Amount	35,256	29,227
Securities purchased under agreements to resell
Gross Amounts of Recognized Assets	5,655	15,475
Net Amounts of Assets Presented in the Condensed Consolidated Statement of Financial Condition	5,655	15,475
Gross Amounts Not Offset In the Condensed Consolidated Statement of Financial Condition
Financial Instruments	(5,650)	(15,475)
Cash Collateral Received	0	0
Net Amount	5	0
Total
Gross Amounts of Recognized Assets	2,505,347	4,219,431
Gross Amounts Offset in the Condensed Consolidated Statement of Financial Condition	(1,209,506)	(2,790,242)
Net Amounts of Assets Presented in the Condensed Consolidated Statement of Financial Condition	1,295,841	1,429,189
Gross Amounts Not Offset In the Condensed Consolidated Statement of Financial Condition
Financial Instruments	(1,256,477)	(1,389,009)
Cash Collateral Received	(698)	(8,822)
Net Amount	38,666	31,358
Currency forwards
Trading assets, at fair value:
Gross Amounts of Recognized Assets	1,212,911	2,792,373
Gross Amounts Offset in the Condensed Consolidated Statement of Financial Condition	(1,209,506)	(2,790,242)
Net Amounts of Assets Presented in the Condensed Consolidated Statement of Financial Condition	3,405	2,131
Gross Amounts Not Offset In the Condensed Consolidated Statement of Financial Condition
Financial Instruments	0	0
Cash Collateral Received	0	0
Net Amount	3,405	2,131
Options
Trading assets, at fair value:
Gross Amounts of Recognized Assets	3,914	11,899
Gross Amounts Offset in the Condensed Consolidated Statement of Financial Condition	0	0
Net Amounts of Assets Presented in the Condensed Consolidated Statement of Financial Condition	3,914	11,899
Gross Amounts Not Offset In the Condensed Consolidated Statement of Financial Condition
Financial Instruments	(3,914)	(11,899)
Cash Collateral Received	0	0
Net Amount	$ 0	$ 0

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	virt_SecuritiesBorrowedGrossAmountsNotOffsetAbstract
Namespace Prefix:	virt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the net amount of securities borrowed after the effects of master netting arrangements and collateral.

+ References

No definition available.

+ Details

Name:	virt_SecuritiesBorrowedNet
Namespace Prefix:	virt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the amount of securities borrowed that could be offset by securities loaned subject to master netting arrangements, but management elects not to offset.

+ References

No definition available.

+ Details

Name:	virt_SecuritiesBorrowedNotOffsetFinancialInstruments
Namespace Prefix:	virt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeForwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_OptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: