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Virtus SGA International Growth Series  
Risk/Return: oef_RiskReturnAbstract  
Risk/Return [Heading] oef_RiskReturnHeading Virtus SGA International Growth Series
Objective [Heading] oef_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] oef_ObjectivePrimaryTextBlock

The Series has an investment objective of high total return consistent with reasonable risk.
Expense Heading [Optional Text] oef_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] oef_ExpenseNarrativeTextBlock

The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the Virtus SGA International Growth Series. The table does not include any fees or sales charges imposed under the variable contracts for which the Series is an investment option. If they were included, your costs would be higher.
Shareholder Fees Caption [Optional Text] oef_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Optional Text] oef_OperatingExpensesCaption Annual Series Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] oef_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] oef_PortfolioTurnoverTextBlock

The Series 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. These costs, which are not reflected in Annual Series Operating Expenses or in the Example, affect the Series’ performance. During the most recent fiscal year, the Series’ portfolio turnover rate was 27% of the average value of its portfolio.

Portfolio Turnover, Rate oef_PortfolioTurnoverRate 27.00%
Expense Example [Heading] oef_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] oef_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Series with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Series 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 Series’ total operating expenses remain the same and that the expense reimbursement arrangement remains in place for the contractual period. The example does not reflect variable contract fees and charges, and if it did, the costs shown would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] oef_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] oef_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] oef_StrategyNarrativeTextBlock

The Series will invest in securities of issuers located throughout the world. Under normal circumstances, the Series will invest at least 80% of its assets in equity securities of issuers organized, headquartered or doing a substantial amount of business outside the U.S. As of the date of this prospectus, the Series’ subadviser, Sustainable Growth Advisers, LP (“SGA”), considers an issuer that has at least 50% of its assets or derives at least 50% of its revenue from business outside the U.S. as doing a substantial amount of business outside the U.S.

SGA uses an investment process to identify companies that it believes have a high degree of predictability, strong profitability and above average earnings and cash flow growth. SGA selects investments for the Series’ portfolio that it believes have superior long-term earnings prospects and attractive valuation. The Series’ equity investments may include common stocks, preferred stocks, securities convertible into or exchangeable for common stocks, and depositary receipts. The Series may invest in companies of all market capitalizations. The Series will allocate its assets among various regions and countries, including emerging markets. From time to time, the Series may have a significant portion of its assets invested in the securities of companies in only a few countries or regions. Although the Series seeks investments across a number of sectors, from time to time, the Series may have significant positions in particular sectors.

SGA will sell a portfolio holding when it believes the security’s fundamentals deteriorate, its valuation is no longer attractive, or a better investment opportunity arises.
Bar Chart and Performance Table [Heading] oef_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] oef_PerformanceNarrativeTextBlock

The following bar chart and table provide some indication of the risks of investing in the Series. The bar chart shows changes in the Series’ performance from year to year over a 10-year period. The Series’ past performance is not necessarily an indication of how the Series will perform in the future. The current subadviser commenced providing services for the Series in June 2019 and therefore the returns shown in the table for periods prior to that date reflect the performance of other investment professionals. The table shows how the Series’ average annual returns compare to those of a broad-based securities market index. The Series’ returns in the chart and table do not reflect the deduction of any separate account or variable contract charges. The returns would have been less than those shown if such charges were deducted. Updated performance information is available at virtus.com or by calling 800-367-5877.

Performance Information Illustrates Variability of Returns [Text] oef_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table provide some indication of the risks of investing in the Series.
Performance Additional Market Index [Text] oef_PerformanceAdditionalMarketIndex The MSCI All Country World ex USA Index (net) is a free float-adjusted market capitalization-weighted index that measures equity performance of developed and emerging markets, excluding the United States. The index is calculated on a total return basis with net dividends reinvested. The index is unmanaged and not available for direct investment.
Performance Availability Phone [Text] oef_PerformanceAvailabilityPhone 800-367-5877
Performance Availability Website Address [Text] oef_PerformanceAvailabilityWebSiteAddress virtus.com
Performance Past Does Not Indicate Future [Text] oef_PerformancePastDoesNotIndicateFuture The Series’ past performance is not necessarily an indication of how the Series will perform in the future.
Bar Chart [Heading] oef_BarChartHeading Calendar year total returns for Class I Shares 
Bar Chart Closing [Text Block] oef_BarChartClosingTextBlock
        

Best Quarter:

2020, Q2:

20.53%

Worst Quarter:

2018, Q4:

-18.33%

Year to Date (3/31/2026):

-9.81%
Performance Table Heading oef_PerformanceTableHeading Average Annual Total Returns (for the periods ended 12/31/2025)
Index No Deduction for Fees, Expenses, or Taxes [Text] oef_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees or expenses)
Performance Table Closing [Text Block] oef_PerformanceTableClosingTextBlock

The MSCI All Country World ex USA Index (net) is a free float-adjusted market capitalization-weighted index that measures equity performance of developed and emerging markets, excluding the United States. The index is calculated on a total return basis with net dividends reinvested. The index is unmanaged and not available for direct investment.
Virtus SGA International Growth Series | Principal Risks  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Principal Risks

The Series may not achieve its objective(s), and it is not intended to be a complete investment program. The value of the Series’ 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 Series’ 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 Series 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 separate accounts of participating insurance companies may impact the management of the Series and its ability to achieve its investment objective(s). The principal risks of investing in the Series are identified below.
Virtus SGA International Growth Series | Risk Lose Money [Member]  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock If between the time you purchase shares and the time you sell shares the value of the Series’ investments decreases, you will lose money.
Virtus SGA International Growth Series | Equity Securities Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Equity Securities Risk: The value of the stocks held by the Series may be negatively affected by the financial market, industries in which the Series invests, or issuer-specific events. Focus on a particular style or in small or medium-sized companies may enhance that risk.
Virtus SGA International Growth Series | Foreign Investing Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Foreign Investing Risk: Investing in foreign securities subjects the Series to additional risks such as increased volatility; currency fluctuations; less liquidity; less publicly available information about the foreign investment; and political, regulatory, economic, and market risk.
Virtus SGA International Growth Series | Emerging Market Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Emerging Market Risk: Emerging markets securities may be more volatile, or more greatly affected by negative conditions, than those of their counterparts in more established foreign markets. Such securities may also be subject to Sanctions Risk.
Virtus SGA International Growth Series | Sanctions Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Sanctions Risk: The imposition of sanctions and other similar measures could cause a decline in the value and/or liquidity of securities issued by or tied to the sanctioned country and increase market volatility and disruption in the sanctioned country and throughout the world. Sanctions and other similar measures could limit or prevent the Series from buying and selling securities (in the sanctioned country and other markets), significantly delay or prevent the settlement of transactions, and negatively impact the Series’ liquidity and performance.
Virtus SGA International Growth Series | Market Volatility Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Market Volatility Risk: The value of the securities in the Series may go up or down in response to the prospects of individual companies and/or general economic conditions. Price changes may be short- or long-term. Local, regional or global events such as war or military conflict (e.g., Russia’s invasion of Ukraine), geopolitical risk, acts of terrorism, the spread of infectious illness or other public health issue, recessions, tariffs and other restrictions on trade, or the threat or potential of one or more such events and developments, could have a significant impact on the Series and its investments, including hampering the ability of the Series’ portfolio manager(s) to invest the Series’ assets as intended.
Virtus SGA International Growth Series | Limited Number of Investments Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Limited Number of Investments Risk: Because the Series may have a limited number of securities, it may be more susceptible to factors adversely affecting its securities than a Series with a greater number of securities.

 
Virtus SGA International Growth Series | Currency Rate Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Currency Rate Risk: Fluctuations in the exchange rates between the U.S. dollar and foreign currencies may negatively affect the value of the Series’ shares.
Virtus SGA International Growth Series | Depositary Receipts Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Depositary Receipts Risk: Investments in foreign companies through depositary receipts may expose the Series to the same risks as direct investments in securities of foreign issuers.
Virtus SGA International Growth Series | Convertible Securities Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Convertible Securities Risk: The value of a convertible security may decline as interest rates rise and/or vary with fluctuations in the market value of the underlying securities. The security may be called for redemption at a time and/or price unfavorable to the Series.
Virtus SGA International Growth Series | Geographic Concentration Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Geographic Concentration Risk: A Series that focuses its investments in a particular geographic location will be sensitive to financial, economic, political and other events negatively affecting that location and may cause the value of the Series to decrease, perhaps significantly.
Virtus SGA International Growth Series | Growth Stocks Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Growth Stocks Risk: The Series’ investments in growth stocks may be more volatile than investments in other types of stocks, or may perform differently from the market as a whole and from other types of stocks.
Virtus SGA International Growth Series | Large Market Capitalization Companies Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Large Market Capitalization Companies Risk: The value of investments in larger companies may not rise as much as smaller companies, or larger companies may be unable to respond quickly to competitive challenges, such as changes in technology and consumer tastes.
Virtus SGA International Growth Series | Preferred Stocks Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Preferred Stocks Risk: Preferred stocks may decline in price, fail to pay dividends when expected, or be illiquid.
Virtus SGA International Growth Series | Redemption Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Redemption Risk: One or more large shareholders or groups of shareholders may redeem their holdings in the Series, resulting in an adverse impact on remaining shareholders in the Series by causing the Series to take actions it would not otherwise have taken. The effects of taxable gains resulting from large redemptions of Series shares would particularly impact non-redeeming shareholders who do not hold their Series shares in a tax-advantaged or tax-exempt vehicle. Such large shareholder redemptions, which may occur rapidly or unexpectedly, may cause a Series to sell portfolio securities at times when it would not otherwise do so, which may negatively impact the Series’ NAV and liquidity. In addition, a large redemption could result in the Series’ current expenses being allocated over a smaller asset base, leading to an increase in the Series’ expense ratio.
Virtus SGA International Growth Series | Small and Medium Market Capitalization Companies Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Small and Medium Market Capitalization Companies Risk: The Series’ investments in small and medium market capitalization companies may increase the volatility and risk of loss to the Series, as compared with investments in larger, more established companies.
Virtus SGA International Growth Series | MSCI AC World ex USA Index (net)  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel MSCI AC World ex USA Index (net)
Average Annual Return, Percent oef_AvgAnnlRtrPct 32.39%
Average Annual Return, Percent oef_AvgAnnlRtrPct 7.91%
Average Annual Return, Percent oef_AvgAnnlRtrPct 8.41%
Virtus SGA International Growth Series | Class A Shares  
Risk/Return: oef_RiskReturnAbstract  
Shareholder Fee, Other oef_ShareholderFeeOther $ 0
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.21%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 1.21%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.11%) [1]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 1.10% [1]
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 112
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 373
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 654
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 1,456
Average Annual Return, Percent oef_AvgAnnlRtrPct 9.26%
Average Annual Return, Percent oef_AvgAnnlRtrPct 1.42%
Average Annual Return, Percent oef_AvgAnnlRtrPct 4.10%
Virtus SGA International Growth Series | Class I Shares  
Risk/Return: oef_RiskReturnAbstract  
Shareholder Fee, Other oef_ShareholderFeeOther $ 0
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.21%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.96%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.11%) [1]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.85% [1]
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 87
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 295
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 520
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 1,168
Year to Date Return, Label [Optional Text] oef_YearToDateReturnLabel Year to Date
Bar Chart, Year to Date Return, Date oef_BarChartYearToDateReturnDate Mar. 31, 2026
Bar Chart, Year to Date Return oef_BarChartYearToDateReturn (9.81%)
Highest Quarterly Return, Label [Optional Text] oef_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date oef_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return oef_BarChartHighestQuarterlyReturn 20.53%
Lowest Quarterly Return, Label [Optional Text] oef_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date oef_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return oef_BarChartLowestQuarterlyReturn (18.33%)
Average Annual Return, Percent oef_AvgAnnlRtrPct 9.52%
Average Annual Return, Percent oef_AvgAnnlRtrPct 1.68%
Average Annual Return, Percent oef_AvgAnnlRtrPct 4.37%
Annual Return [Percent] oef_AnnlRtrPct (1.28%)
Annual Return [Percent] oef_AnnlRtrPct 16.17%
Annual Return [Percent] oef_AnnlRtrPct (16.44%)
Annual Return [Percent] oef_AnnlRtrPct 18.77%
Annual Return [Percent] oef_AnnlRtrPct 23.95%
Annual Return [Percent] oef_AnnlRtrPct 8.67%
Annual Return [Percent] oef_AnnlRtrPct (18.41%)
Annual Return [Percent] oef_AnnlRtrPct 18.24%
Annual Return [Percent] oef_AnnlRtrPct (5.34%)
Annual Return [Percent] oef_AnnlRtrPct 9.52%
[1]

The Series’ investment adviser has contractually agreed to limit the Series’ total annual operating expenses (excluding certain expenses, such as front-end sales charges, taxes, leverage and borrowing expenses (such as commitment, amendment and renewal expenses on credit or redemption facilities), 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 1.10% for Class A Shares and 0.85% for Class I Shares through April 30, 2027. Prior to April 30, 2027, only the Series' Board may modify or terminate the expense limitation agreement. Following the contractual period, the adviser may discontinue these expense reimbursement arrangements at any time. 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 Series to exceed its expense limit in effect at the time of the waiver or reimbursement, and any in effect at the time of recapture, after repayment is taken into account.