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Consolidated Sponsored Investment Products - Additional Information (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 Product | Dec. 31, 2013 Product | Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items] |  |  |
Number of consolidated sponsored investment products | 12 vrts_NumberOfSponsoredInvestmentProductsConsolidated | 8 vrts_NumberOfSponsoredInvestmentProductsConsolidated |
Number of additional consolidated sponsored investment products | 6 vrts_NumberOfAdditionalConsolidatedSponsoredInvestmentProducts |  |
Number of deconsolidated sponsored investment products | 2 vrts_NumberOfSponsoredInvestmentProductsDeconsolidated |  |
Fair value, securities, Level 1 to Level 2 transfers, amount | $ 0 us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount | $ 0 us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount | $ 0 us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount
Percentage of permitted borrowings | 33.33%vrts_PercentageOfBorrowingsOnAssetsAvailableAsCollateral |  |
Securities [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Fair value, securities, Level 1 to Level 2 transfers, amount | $ 1,500,000 us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount / us-gaap_InvestmentTypeAxis = us-gaap_SecuritiesInvestmentMember |  |

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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 Number of additional consolidated sponsored investment products. + References No definition available. + Details
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- Definition Number of sponsored investment products consolidated. + References No definition available. + Details
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- Definition Number of sponsored investment products deconsolidated. + References No definition available. + Details
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- Definition Percentage Of Borrowings On Assets Available As Collateral + References No definition available. + Details
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