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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
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 $ 61,566vrts_RevenueFromInvestmentManagementAdministrationAndTransferAgentFees
/ us-gaap_ConcentrationRiskByTypeAxis
= vrts_VirtusPremiumAlphaSectorFundMember		 $ 41,921vrts_RevenueFromInvestmentManagementAdministrationAndTransferAgentFees
/ us-gaap_ConcentrationRiskByTypeAxis
= vrts_VirtusPremiumAlphaSectorFundMember		 $ 27,987vrts_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 55,401vrts_RevenueFromInvestmentManagementAdministrationAndTransferAgentFees
/ us-gaap_ConcentrationRiskByTypeAxis
= vrts_VirtusMultiSectorShortTermBondFundMember		 52,568vrts_RevenueFromInvestmentManagementAdministrationAndTransferAgentFees
/ us-gaap_ConcentrationRiskByTypeAxis
= vrts_VirtusMultiSectorShortTermBondFundMember		 39,475vrts_RevenueFromInvestmentManagementAdministrationAndTransferAgentFees
/ us-gaap_ConcentrationRiskByTypeAxis
= vrts_VirtusMultiSectorShortTermBondFundMember
Virtus Emerging Markets Opportunities Fund [Member]      
Concentration Risk [Line Items]      
Investment management, administration and transfer agent fees $ 50,435vrts_RevenueFromInvestmentManagementAdministrationAndTransferAgentFees
/ us-gaap_ConcentrationRiskByTypeAxis
= vrts_VirtusEmergingMarketsOpportunitiesFundMember		 $ 53,202vrts_RevenueFromInvestmentManagementAdministrationAndTransferAgentFees
/ us-gaap_ConcentrationRiskByTypeAxis
= vrts_VirtusEmergingMarketsOpportunitiesFundMember		 $ 29,818vrts_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