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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 | Mar. 31, 2015 | Dec. 31, 2014
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Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | $ 254,481 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts | $ 236,652 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts
Liabilities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Investments of Consolidated Sponsored Investment Products at Fair Value | 9,685 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LiabilityMember | 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 | 172 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LiabilityMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = vrts_DerivativeAssetsMember | 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 | 9,513 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LiabilityMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = vrts_ShortSalesMember | 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 | 9,104 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LiabilityMember | 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 | 129 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LiabilityMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = vrts_DerivativeAssetsMember | 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 | 8,975 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LiabilityMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = vrts_ShortSalesMember | 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 | 581 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LiabilityMember | 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 | 43 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 | 538 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LiabilityMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = vrts_ShortSalesMember | 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 | 254,748 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember | 237,033 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 | 145,304 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | 136,115 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 | 109,177 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 100,537 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 | 267 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = vrts_DerivativeAssetsMember | 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 | 108,496 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 82,571 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 | 108,408 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 82,417 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 | 88 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = vrts_DerivativeAssetsMember | 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 | 145,339 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 153,397 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 | 144,391 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | 135,050 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 | 769 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 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 | 179 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = vrts_DerivativeAssetsMember | 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 | 913 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 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 | 913 vrts_InvestmentsOfConsolidatedSponsoredInvestmentProducts / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | 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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