Summary of Significant Accounting Policies - Securities Borrowed and Securities Loaned (Details)	12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]
Minimum initial collateral advanced or received expressed as a percentage of fair value of the underlying securities borrowed or loaned	102.00%

Represents the minimum initial collateral advanced or received expressed as a percentage of fair value of the underlying securities borrowed or loaned.

No definition available.

Name:	virt_SecuritiesBorrowedAndSecuritiesLoanedMinimumInitialCollateralAdvancedOrReceivedExpressedAsPercentageOfFairValueOfUnderlyingSecuritiesBorrowedOrLoaned
Namespace Prefix:	virt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration