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Financial Assets and Liabilities - Netting of Certain Financial Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Securities borrowed
Gross Amounts of Recognized Assets	$ 1,425,016	$ 1,928,763
Net Amounts of Assets Presented in the Consolidated Statements of Financial Condition	1,425,016	1,928,763
Amounts Not Offset in the Consolidated Statements of Financial Condition
Financial Instrument Collateral	(1,374,266)	(1,881,005)
Counterparty Netting/ Cash Collateral	(9,686)	(15,280)
Net Amount	41,064	32,478
Securities purchased under agreements to resell
Gross Amounts of Recognized Assets	22,866	143,032
Net Amounts of Assets Presented in the Consolidated Statements of Financial Condition	22,866	143,032
Amounts Not Offset in the Consolidated Statements of Financial Condition
Financial Instrument Collateral	(22,866)	(142,922)
Counterparty Netting/ Cash Collateral	0	0
Net Amount	0	110
Total
Gross Amounts of Recognized Assets	1,798,322	2,322,885
Amounts Offset in the Consolidated Statements of Financial Condition	(291,964)	(211,398)
Net Amounts of Assets Presented in the Consolidated Statements of Financial Condition	1,506,358	2,111,487
Amounts Not Offset in the Consolidated Statements of Financial Condition
Financial Instrument Collateral	(1,397,132)	(2,032,464)
Counterparty Netting/ Cash Collateral	(18,766)	(15,280)
Net Amount	90,460	63,743
Currency forwards
Trading assets, at fair value:
Gross Amounts of Recognized Assets	341,360	242,552
Amounts Offset in the Consolidated Statements of Financial Condition	(291,964)	(211,398)
Net Amounts of Assets Presented in the Consolidated Statements of Financial Condition	49,396	31,154
Amounts Not Offset in the Consolidated Statements of Financial Condition
Financial Instrument Collateral	0	0
Counterparty Netting/ Cash Collateral	0	0
Net Amount	49,396	31,154
Options
Trading assets, at fair value:
Gross Amounts of Recognized Assets	9,080	8,538
Amounts Offset in the Consolidated Statements of Financial Condition	0	0
Net Amounts of Assets Presented in the Consolidated Statements of Financial Condition	9,080	8,538
Amounts Not Offset in the Consolidated Statements of Financial Condition
Financial Instrument Collateral	0	(8,537)
Counterparty Netting/ Cash Collateral	(9,080)	0
Net Amount	$ 0	$ 1

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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: