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Borrowings - Broker-Dealer Credit Facilities, Narrative (Details)	Nov. 03, 2017 USD ($) borrowing_base broker_dealer	Mar. 31, 2019 USD ($) debt_instrument broker_dealer	Mar. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)	Nov. 02, 2017 USD ($)
Line of Credit Facility [Line Items]
Number of borrowing bases | borrowing_base	2
Number of broker-dealer subsidiaries | broker_dealer	3	5
Broker-dealer credit facilities
Line of Credit Facility [Line Items]
Number of secured credit facilities | debt_instrument		2
Aggregate borrowing	$ 500,000,000	$ 800,000,000	$ 600,000,000	$ 700,000,000
Commitment fee (as a percent)	0.50%
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		$ 200,000,000
Aggregate borrowing		$ 200,000,000		$ 200,000,000
Borrowing Base A Loan | Broker-dealer credit facilities
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 600,000,000				$ 400,000,000
Borrowing Base A Loan | Broker-dealer credit facilities | LIBOR
Line of Credit Facility [Line Items]
Interest rate margin (as a percent)	1.25%
Borrowing Base B Loan | Broker-dealer credit facilities
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 150,000,000				$ 40,000,000
Borrowing Base B Loan | Broker-dealer credit facilities | LIBOR
Line of Credit Facility [Line Items]
Interest rate margin (as a percent)	2.50%

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_
Data Type:	num:percentItemType
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=6877327&loc=d3e13212-122682

+ Details

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

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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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=6877327&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 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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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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
Period Type:	instant

X

- Definition

Represents the number of broker-dealer subsidiaries of the entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	virt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the number of secured credit facilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	virt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:
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X

- Details

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X

- Details

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- Details

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- Details

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