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Concentration of Credit Risk - Summary of Funds Provided Ten Percent or More of Total Revenues (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Virtus Premium AlphaSector Fund [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Investment management, administration and transfer agent fees | $ 61,566 vrts_RevenueFromInvestmentManagementAdministrationAndTransferAgentFees / us-gaap_ConcentrationRiskByTypeAxis = vrts_VirtusPremiumAlphaSectorFundMember | $ 41,921 vrts_RevenueFromInvestmentManagementAdministrationAndTransferAgentFees / us-gaap_ConcentrationRiskByTypeAxis = vrts_VirtusPremiumAlphaSectorFundMember | $ 27,987 vrts_RevenueFromInvestmentManagementAdministrationAndTransferAgentFees / us-gaap_ConcentrationRiskByTypeAxis = vrts_VirtusPremiumAlphaSectorFundMember
Virtus Multi-Sector Short Term Bond Fund [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Investment management, administration and transfer agent fees | 55,401 vrts_RevenueFromInvestmentManagementAdministrationAndTransferAgentFees / us-gaap_ConcentrationRiskByTypeAxis = vrts_VirtusMultiSectorShortTermBondFundMember | 52,568 vrts_RevenueFromInvestmentManagementAdministrationAndTransferAgentFees / us-gaap_ConcentrationRiskByTypeAxis = vrts_VirtusMultiSectorShortTermBondFundMember | 39,475 vrts_RevenueFromInvestmentManagementAdministrationAndTransferAgentFees / us-gaap_ConcentrationRiskByTypeAxis = vrts_VirtusMultiSectorShortTermBondFundMember
Virtus Emerging Markets Opportunities Fund [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Investment management, administration and transfer agent fees | $ 50,435 vrts_RevenueFromInvestmentManagementAdministrationAndTransferAgentFees / us-gaap_ConcentrationRiskByTypeAxis = vrts_VirtusEmergingMarketsOpportunitiesFundMember | $ 53,202 vrts_RevenueFromInvestmentManagementAdministrationAndTransferAgentFees / us-gaap_ConcentrationRiskByTypeAxis = vrts_VirtusEmergingMarketsOpportunitiesFundMember | $ 29,818 vrts_RevenueFromInvestmentManagementAdministrationAndTransferAgentFees / us-gaap_ConcentrationRiskByTypeAxis = vrts_VirtusEmergingMarketsOpportunitiesFundMember
Sales Revenue, Services, Net [Member] | Virtus Premium AlphaSector Fund [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Percent of total revenues | 14.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueServicesNetMember / us-gaap_ConcentrationRiskByTypeAxis = vrts_VirtusPremiumAlphaSectorFundMember | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueServicesNetMember / us-gaap_ConcentrationRiskByTypeAxis = vrts_VirtusPremiumAlphaSectorFundMember | 12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueServicesNetMember / us-gaap_ConcentrationRiskByTypeAxis = vrts_VirtusPremiumAlphaSectorFundMember
Sales Revenue, Services, Net [Member] | Virtus Multi-Sector Short Term Bond Fund [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Percent of total revenues | 12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueServicesNetMember / us-gaap_ConcentrationRiskByTypeAxis = vrts_VirtusMultiSectorShortTermBondFundMember | 14.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueServicesNetMember / us-gaap_ConcentrationRiskByTypeAxis = vrts_VirtusMultiSectorShortTermBondFundMember | 17.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueServicesNetMember / us-gaap_ConcentrationRiskByTypeAxis = vrts_VirtusMultiSectorShortTermBondFundMember
Sales Revenue, Services, Net [Member] | Virtus Emerging Markets Opportunities Fund [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Percent of total revenues | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueServicesNetMember / us-gaap_ConcentrationRiskByTypeAxis = vrts_VirtusEmergingMarketsOpportunitiesFundMember | 14.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueServicesNetMember / us-gaap_ConcentrationRiskByTypeAxis = vrts_VirtusEmergingMarketsOpportunitiesFundMember | 12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueServicesNetMember / us-gaap_ConcentrationRiskByTypeAxis = vrts_VirtusEmergingMarketsOpportunitiesFundMember

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Definition Revenue From Investment Management Administration And Transfer Agent Fees + References No definition available. + Details
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