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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Central Index Key dei_EntityCentralIndexKey 0001005020
Virtus Vontobel Foreign Opportunities Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Virtus Vontobel Foreign Opportunities Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The fund has an investment objective of long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The tables below illustrate all fees and expenses that you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts in Class A Shares if you and your family invest, or agree to invest in the future, at least $50,000 in Virtus Funds. More information on these and other discounts is available: (i) from your financial advisor or other financial intermediary; (ii) under “Sales Charges” on page 176 of the fund’s prospectus; (iii) with respect to purchase of shares through specific intermediaries, in Appendix A to the fund’s prospectus, entitled “Intermediary Sales Charge Discounts and Waivers;” and (iv) under “Alternative Purchase Arrangements” on page 114 of the fund’s statement of additional information.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 31, 2021
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance. During the most recent fiscal year, the fund's portfolio turnover rate was 39% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 39.00%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock
The deferred sales charge is imposed on Class C Shares redeemed during the first year only.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts in Class A Shares if you and your family invest, or agree to invest in the future, at least $50,000 in Virtus Funds.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year, that the fund’s operating expenses remain the same and that the expense reimbursement agreement remains in place for the contractual period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Investments, Risks and Performance Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
This fund seeks to provide investors with access to high-quality international companies. The securities selected for inclusion in the fund are those that in the opinion of the subadviser are well-managed businesses with consistent operating histories and financial performance that have favorable long-term economic prospects and, in most cases, generate free cash flow. Over full market cycles, the investment style is designed with the objective of capturing part of the up market cycles and may offer protection in down market cycles.
 
Under normal circumstances, at least 80% of the fund’s assets are invested in equity securities or equity-linked instruments of issuers located outside the United States, including issuers in emerging markets countries. The fund intends to diversify its investments among countries and normally to have represented in the portfolio business activities of a number of different countries. In determining the “location” of an issuer, the subadviser primarily relies on the country where the issuer is incorporated. However, the country of risk is ultimately determined based on analysis of the following criteria: actual building address (domicile), primary exchange on which the security is traded and country in which the greatest percentage of company revenue is generated. This evaluation is conducted so as to determine that the issuer’s assets are exposed to the economic fortunes and risks of the designated country.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

The fund may not achieve its objective(s), and it is not intended to be a complete investment program. The value of the fund’s investments that supports your share value may decrease. If between the time you purchase shares and the time you sell shares the value of the fund’s investments decreases, you will lose money. Investment values can decrease for a number of reasons. Conditions affecting the overall economy, specific industries or companies in which the fund invests can be worse than expected, and investments may fail to perform as the subadviser expects. As a result, the value of your shares may decrease. Purchase and redemption activities by fund shareholders may impact the management of the fund and its ability to achieve its investment objective(s). The principal risks of investing in the fund are:

>      Depositary Receipts Risk.  The risk that investments in foreign companies through depositary receipts will expose the fund to the same risks as direct investments in securities of foreign issuers.

>      Emerging Market Investing Risk.  The risk that prices of emerging markets securities will be more volatile, or will be more greatly affected by negative conditions, than those of their counterparts in more established foreign markets.

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>      Equity-Linked Instruments Risk.  The risk that, in addition to market risk and other risks of the referenced equity security, the fund may experience a return that is different from that of the referenced equity security. Equity-linked instruments also subject the fund to counterparty risk, including the risk that the issuing entity may not be able to honor its financial commitment, which could result in a loss of all or part of the fund's investment.

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>      Equity Securities Risk.  The risk that events negatively affecting issuers, industries or financial markets in which the fund invests will impact the value of the stocks held by the fund and, thus, the value of the fund's shares over short or extended periods. Investments in a particular style or in small or medium-sized companies may enhance that risk.

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>      Foreign Investing Risk.  The risk that the prices of foreign securities in the fund's portfolio will be more volatile than those of domestic securities, or will be negatively affected by currency fluctuations, less regulated or liquid securities markets, or economic, political or other developments.

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>      Market Volatility Risk.  The risk that the value of the securities in which the fund invests may go up or down in response to the prospects of individual issuers and/or general economic conditions. Such price changes may be temporary or may last for extended periods.

>      Redemption Risk.  The risk that redemption by one or more large shareholders or groups of shareholders of their holdings in the fund has an adverse impact on the remaining shareholders in the fund by causing the fund to take actions it would not otherwise take at a given time.
Risk Lose Money [Text] rr_RiskLoseMoney If between the time you purchase shares and the time you sell shares the value of the fund's investments decreases, you will lose money.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table below provide some indication of the potential risks of investing in the fund. The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.
  
The bar chart shows changes in the fund’s performance from year to year over a 10-year period. The table shows how the fund’s average annual returns compare to those of a broad-based securities market index. Updated performance information is available at virtus.com or by calling 800-243-1574.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart shows changes in the fund's performance from year to year over a 10-year period. The table shows how the fund's average annual returns compare to those of a broad-based securities market index.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800-243-1574
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress virtus.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The fund's past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar year total returns for Class I Shares (includes returns of a predecessor fund)
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock
Returns do not reflect sales charges and would be lower if they did.
 
Annual Return (%)
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads Returns do not reflect sales charges and would be lower if they did.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
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Best Quarter:
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Q2/2009:
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18.77%
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Worst Quarter:
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Q1/2009:
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-13.27%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the periods ended 12/31/18; includes returns of a predecessor fund)
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads Returns reflect deduction of maximum sales charges and full redemption at end of periods shown.
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock
Returns reflect deduction of maximum sales charges and full redemption at end of periods shown.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
The MSCI EAFE® Index (net) is a free float-adjusted market capitalization-weighted index that measures developed foreign market equity performance, excluding the U.S. and Canada. The MSCI EAFE® Index (net) is calculated on a total return basis with net dividends reinvested. The index is unmanaged and not available for direct investment.
 
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.
Virtus Vontobel Foreign Opportunities Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (load) (as a percentage of the lesser of purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.85%
Distribution and Shareholder Servicing (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.33%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.43%
Less: Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%) [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.39% [1]
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
1 Year rr_ExpenseExampleYear01 708
3 Years rr_ExpenseExampleYear03 998
5 Years rr_ExpenseExampleYear05 1,308
10 Years rr_ExpenseExampleYear10 2,186
1 Year rr_ExpenseExampleNoRedemptionYear01 708
3 Years rr_ExpenseExampleNoRedemptionYear03 998
5 Years rr_ExpenseExampleNoRedemptionYear05 1,308
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,186
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (17.66%)
5 Years rr_AverageAnnualReturnYear05 1.91%
10 Years rr_AverageAnnualReturnYear10 6.73%
Virtus Vontobel Foreign Opportunities Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (load) (as a percentage of the lesser of purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 1.00% [2]
Management Fees rr_ManagementFeesOverAssets 0.85%
Distribution and Shareholder Servicing (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.25%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.10%
Less: Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 2.05% [1]
1 Year rr_ExpenseExampleYear01 $ 308
3 Years rr_ExpenseExampleYear03 653
5 Years rr_ExpenseExampleYear05 1,124
10 Years rr_ExpenseExampleYear10 2,427
1 Year rr_ExpenseExampleNoRedemptionYear01 208
3 Years rr_ExpenseExampleNoRedemptionYear03 653
5 Years rr_ExpenseExampleNoRedemptionYear05 1,124
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,427
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (13.18%)
5 Years rr_AverageAnnualReturnYear05 2.38%
10 Years rr_AverageAnnualReturnYear10 6.57%
Virtus Vontobel Foreign Opportunities Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (load) (as a percentage of the lesser of purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.85%
Distribution and Shareholder Servicing (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.27%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.12%
Less: Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.07% [1]
1 Year rr_ExpenseExampleYear01 $ 109
3 Years rr_ExpenseExampleYear03 351
5 Years rr_ExpenseExampleYear05 612
10 Years rr_ExpenseExampleYear10 1,359
1 Year rr_ExpenseExampleNoRedemptionYear01 109
3 Years rr_ExpenseExampleNoRedemptionYear03 351
5 Years rr_ExpenseExampleNoRedemptionYear05 612
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,359
2009 rr_AnnualReturn2009 22.58%
2010 rr_AnnualReturn2010 12.96%
2011 rr_AnnualReturn2011 0.44%
2012 rr_AnnualReturn2012 20.17%
2013 rr_AnnualReturn2013 5.69%
2014 rr_AnnualReturn2014 2.63%
2015 rr_AnnualReturn2015 3.38%
2016 rr_AnnualReturn2016 (4.20%)
2017 rr_AnnualReturn2017 32.70%
2018 rr_AnnualReturn2018 (12.36%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 18.77%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2009
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (13.27%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (12.36%)
5 Years rr_AverageAnnualReturnYear05 3.40%
10 Years rr_AverageAnnualReturnYear10 7.64%
Virtus Vontobel Foreign Opportunities Fund | Class R6  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (load) (as a percentage of the lesser of purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.85%
Distribution and Shareholder Servicing (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.18%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.03%
Less: Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.08%) [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.95% [1]
1 Year rr_ExpenseExampleYear01 $ 97
3 Years rr_ExpenseExampleYear03 311
5 Years rr_ExpenseExampleYear05 552
10 Years rr_ExpenseExampleYear10 1,244
1 Year rr_ExpenseExampleNoRedemptionYear01 97
3 Years rr_ExpenseExampleNoRedemptionYear03 311
5 Years rr_ExpenseExampleNoRedemptionYear05 552
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,244
Label rr_AverageAnnualReturnLabel Returns Before Taxes
1 Year rr_AverageAnnualReturnYear01 (12.29%)
Since Inception rr_AverageAnnualReturnSinceInception 2.95%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 12, 2014
Virtus Vontobel Foreign Opportunities Fund | Return After Taxes on Distributions | Class I  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (16.05%)
5 Years rr_AverageAnnualReturnYear05 2.44%
10 Years rr_AverageAnnualReturnYear10 7.12%
Virtus Vontobel Foreign Opportunities Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class I  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 (4.44%)
5 Years rr_AverageAnnualReturnYear05 2.77%
10 Years rr_AverageAnnualReturnYear10 6.42%
Virtus Vontobel Foreign Opportunities Fund | MSCI EAFE® Index (net)  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Label rr_AverageAnnualReturnLabel MSCI EAFE® Index (net) (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 (13.79%)
5 Years rr_AverageAnnualReturnYear05 0.53%
10 Years rr_AverageAnnualReturnYear10 6.32%
Virtus Vontobel Foreign Opportunities Fund | MSCI EAFE® Index (net) | Class R6  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Label rr_AverageAnnualReturnLabel MSCI EAFE® Index (net) (reflects no deduction for fees, expenses or taxes)
Since Inception rr_AverageAnnualReturnSinceInception 1.44%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 12, 2014
[1] The fund's investment adviser has contractually agreed to limit the fund's total operating expenses (excluding certain expenses, such as front-end or contingent deferred sales charges, taxes, leverage expenses, interest, brokerage commissions, expenses incurred in connection with any merger or reorganization, unusual or infrequently occurring expenses (such as litigation), acquired fund fees and expenses, and dividend expenses, if any) so that such expenses do not exceed 1.39% for Class A Shares, 2.05% for Class C Shares, 1.07% for Class I Shares and 0.95% for Class R6 Shares through March 31, 2021. Following the contractual period, the adviser may discontinue these expense reimbursement arrangements at any time. Under certain conditions, the adviser may recapture operating expenses reimbursed and/or fees waived under these arrangements for a period of three years following the date such waiver or reimbursement occurred, provided that the recapture does not cause the fund to exceed its expense limit in effect at the time of the waiver or reimbursement, or at the time of recapture.
[2] The deferred sales charge is imposed on Class C Shares redeemed during the first year only.