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Investments - Additional Information (Detail) | 12 Months Ended |  | 12 Months Ended | 0 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2014 Maximum [Member] USD ($) | Apr. 09, 2013 Kleinwort Benson Investors International, Ltd. [Member] | Dec. 31, 2014 Kleinwort Benson Investors International, Ltd. [Member] | Apr. 09, 2013 Kleinwort Benson Investors International, Ltd. [Member] USD ($) | Apr. 09, 2013 Kleinwort Benson Investors International, Ltd. [Member] EUR (€)
Investment [Line Items] |  |  |  |  |  |  |  |  |
Realized gain on trading securities | $ 8,200,000 us-gaap_TradingSecuritiesRealizedGainLoss | $ 1,000,000 us-gaap_TradingSecuritiesRealizedGainLoss | $ 400,000 us-gaap_TradingSecuritiesRealizedGainLoss |  |  |  |  |  |
Interest acquired in limited partnership | 5,000,000 us-gaap_PaymentsToAcquireLimitedPartnershipInterests |  |  |  |  |  |  |  |
Future capital commitment |  |  |  |  | 6,700,000 vrts_EquityMethodInvestmentCapitalCommitment / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |
Acquisition date |  |  |  |  |  |  | Apr. 09, 2013 |  |
Percentage of noncontrolling equity interest acquired | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage |  |  |  |  |  |  | 24.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_BusinessAcquisitionAxis = vrts_KleinwortBensonInvestorsInternationalMember | 24.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_BusinessAcquisitionAxis = vrts_KleinwortBensonInvestorsInternationalMember
Noncontrolling equity interest acquired, amount |  |  |  |  |  |  |  | 3,400,000 us-gaap_EquityMethodInvestmentAggregateCost / us-gaap_BusinessAcquisitionAxis = vrts_KleinwortBensonInvestorsInternationalMember | 2,600,000 us-gaap_EquityMethodInvestmentAggregateCost / us-gaap_BusinessAcquisitionAxis = vrts_KleinwortBensonInvestorsInternationalMember
Investment to goodwill | 5,260,000 us-gaap_Goodwill | 5,260,000 us-gaap_Goodwill | 5,260,000 us-gaap_Goodwill | 4,795,000 us-gaap_Goodwill |  |  |  | 2,500,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = vrts_KleinwortBensonInvestorsInternationalMember |
Definite-lived intangible assets |  |  |  |  |  |  |  | 600,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = vrts_KleinwortBensonInvestorsInternationalMember |
Period of amortization of definite-lived intangible assets |  |  |  |  |  | 7 years |  |  |
Remaining assets and liabilities |  |  |  |  |  |  |  | $ 300,000 vrts_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetExcludingGoodwillAndIntangibles / us-gaap_BusinessAcquisitionAxis = vrts_KleinwortBensonInvestorsInternationalMember |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Acquisition Date -URI http://asc.fasb.org/extlink&oid=6919109 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e848-128460 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition This item represents the gain (loss) realized during the period from the sale of trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph c -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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