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Consolidated Sponsored Investment Products - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | $ 236,652 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts | $ 139,054 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts
Liabilities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 8,356 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LiabilityMember |
Liabilities [Member] | Derivatives Assets [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 191 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LiabilityMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = vrts_DerivativeAssetsMember |
Liabilities [Member] | Short Sales [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 8,165 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LiabilityMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = vrts_ShortSalesMember |
Level 1 [Member] | Liabilities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 7,682 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LiabilityMember |
Level 1 [Member] | Liabilities [Member] | Derivatives Assets [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 191 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LiabilityMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = vrts_DerivativeAssetsMember |
Level 1 [Member] | Liabilities [Member] | Short Sales [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 7,491 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LiabilityMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = vrts_ShortSalesMember |
Level 2 [Member] | Liabilities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 674 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LiabilityMember |
Level 2 [Member] | Liabilities [Member] | Derivatives Assets [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 0 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LiabilityMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = vrts_DerivativeAssetsMember |
Level 2 [Member] | Liabilities [Member] | Short Sales [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 674 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LiabilityMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = vrts_ShortSalesMember |
Level 3 [Member] | Liabilities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 0 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LiabilityMember |
Level 3 [Member] | Liabilities [Member] | Derivatives Assets [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 0 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LiabilityMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = vrts_DerivativeAssetsMember |
Level 3 [Member] | Liabilities [Member] | Short Sales [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 0 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LiabilityMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = vrts_ShortSalesMember |
Assets [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 237,033 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember | 139,054 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember
Assets [Member] | Debt Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 136,115 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | 47,114 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember
Assets [Member] | Equity Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 100,537 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 91,940 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Assets [Member] | Derivatives Assets [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 381 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = vrts_DerivativeAssetsMember |
Assets [Member] | Level 1 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 82,571 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 91,940 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Assets [Member] | Level 1 [Member] | Debt Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 0 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember |
Assets [Member] | Level 1 [Member] | Equity Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 82,417 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 91,940 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Assets [Member] | Level 1 [Member] | Derivatives Assets [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 154 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = vrts_DerivativeAssetsMember |
Assets [Member] | Level 2 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 153,397 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 47,114 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Assets [Member] | Level 2 [Member] | Debt Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 135,050 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | 47,114 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember
Assets [Member] | Level 2 [Member] | Equity Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 18,120 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
Assets [Member] | Level 2 [Member] | Derivatives Assets [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 227 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = vrts_DerivativeAssetsMember |
Assets [Member] | Level 3 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 1,065 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Assets [Member] | Level 3 [Member] | Debt Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 1,065 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember |
Assets [Member] | Level 3 [Member] | Equity Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 0 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
Assets [Member] | Level 3 [Member] | Derivatives Assets [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | $ 0 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = vrts_DerivativeAssetsMember |

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- Definition Current investment securities of consolidated sponsored investment products, which includes financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time, usually less than one year or the normal operating cycle, whichever is longer). + References No definition available. + Details
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