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Consolidated Sponsored Investment Products - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015 Product	Dec. 31, 2014 Product	Mar. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Number of consolidated sponsored investment products	12vrts_NumberOfSponsoredInvestmentProductsConsolidated	12vrts_NumberOfSponsoredInvestmentProductsConsolidated
Number of additional consolidated sponsored investment product	1vrts_NumberOfAdditionalConsolidatedSponsoredInvestmentProducts
Number of deconsolidated sponsored investment products	1vrts_NumberOfSponsoredInvestmentProductsDeconsolidated
Fair value, securities, Level 1 to Level 2 transfers, amount	$ 0us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount		$ 0us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount
Fair value, securities, Level 2 to Level 1 transfers, amount	15,300,000us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount		0us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount
Maximum [Member]
Condensed Financial Statements, Captions [Line Items]
Fair value, securities, Level 1 to Level 2 transfers, amount	100,000us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount / us-gaap_RangeAxis = us-gaap_MaximumMember		0us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount / us-gaap_RangeAxis = us-gaap_MaximumMember
Percentage of permitted borrowings	33.33%vrts_PercentageOfBorrowingsOnAssetsAvailableAsCollateral / us-gaap_RangeAxis = us-gaap_MaximumMember
Level 3 [Member]
Condensed Financial Statements, Captions [Line Items]
Assets with level 3 fair value			0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Liabilities with level 3 fair value			$ 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

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Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

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-Section 50

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

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Number of additional consolidated sponsored investment products.

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Number of sponsored investment products consolidated.

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Number of sponsored investment products deconsolidated.

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Percentage Of Borrowings On Assets Available As Collateral

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