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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 | 12 vrts_NumberOfSponsoredInvestmentProductsConsolidated | 12 vrts_NumberOfSponsoredInvestmentProductsConsolidated |
Number of additional consolidated sponsored investment product | 1 vrts_NumberOfAdditionalConsolidatedSponsoredInvestmentProducts |  |
Number of deconsolidated sponsored investment products | 1 vrts_NumberOfSponsoredInvestmentProductsDeconsolidated |  |
Fair value, securities, Level 1 to Level 2 transfers, amount | $ 0 us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount |  | $ 0 us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount
Fair value, securities, Level 2 to Level 1 transfers, amount | 15,300,000 us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount |  | 0 us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount
Maximum [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Fair value, securities, Level 1 to Level 2 transfers, amount | 100,000 us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount / us-gaap_RangeAxis = us-gaap_MaximumMember |  | 0 us-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 |  |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Liabilities with level 3 fair value |  |  | $ 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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- Definition 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 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition 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 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Number of additional consolidated sponsored investment products. + References No definition available. + Details
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