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Borrowings - Broker-Dealer Credit Facilities, Narrative (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) borrowing_base debt_instrument	Apr. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Mar. 20, 2020 USD ($)	Mar. 10, 2020 USD ($)	Dec. 31, 2019 USD ($)	Mar. 01, 2019 USD ($)
Line of Credit Facility [Line Items]
Number of borrowing bases | borrowing_base	2
Commitment fee (as a percent)	0.50%
Broker-dealer credit facilities
Line of Credit Facility [Line Items]
Number of secured credit facilities | debt_instrument	2
Maximum borrowing capacity							$ 600,000,000
Commitment fee (as a percent)	0.50%
Financing Available	$ 1,000,000,000					$ 800,000,000
Broker-dealer credit facilities | Borrowing Base A Loan
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 600,000,000
Broker-dealer credit facilities | Borrowing Base A Loan | LIBOR
Line of Credit Facility [Line Items]
Interest rate margin (as a percent)	1.25%
Broker-dealer credit facilities | Borrowing Base B Loan
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 200,000,000
Broker-dealer credit facilities | Borrowing Base B Loan | LIBOR
Line of Credit Facility [Line Items]
Interest rate margin (as a percent)	2.50%
Broker-dealer credit facility on an uncommitted basis
Line of Credit Facility [Line Items]
Number of secured credit facilities | debt_instrument	1
Maximum borrowing capacity		$ 400,000,000	$ 300,000,000
Financing Available	$ 400,000,000					$ 200,000,000
Interest rate	1.25%					2.55%
Demand Loan
Line of Credit Facility [Line Items]
Financing Available					$ 20,000,000
Repayment term	90 days
Interest rate	10.00%
Stated interest rate increase	2.00%
Founder Member Loan Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity				$ 300,000,000

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The effective interest rate at the end of the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Balance Type:	na
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X

- Definition

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.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Period Type:	instant

X

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Debt Instrument, Stated Interest Rate Increase Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	virt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of borrowing bases for a credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	virt_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Definition

Represents the number of secured credit facilities.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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