Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	VIRTUS OPPORTUNITIES TRUST
Prospectus Date	rr_ProspectusDate	Jan. 31, 2013
Virtus International Small-Cap Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Virtus International Small-Cap Fund
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The fund has an investment objective of 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 if you and your family invest, or agree to invest in the future, at least $50,000 in Virtus Mutual Funds. More information about these and other discounts, as well as eligibility requirements for each share class, is available from your financial advisor and under “Sales Charges” on page 193 of the fund’s prospectus and “Alternative Purchase Arrangements” on page 57 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	January 31, 2014
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 period from inception (September 5, 2012) through its fiscal year end (September 30, 2012), the fund’s portfolio turnover rate was 0% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	0.00%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	Generally, Class A Shares are not subject to any charges by the Fund when redeemed; however, a contingent deferred sales charge may be imposed on certain redemptions within 18 months on exchanges from a Virtus non-money market fund into a Virtus money market fund and purchases on which a finder’s fee has been paid. The 18-month period begins on the last day of the month preceding the month in which the purchase was made. 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 if you and your family invest, or agree to invest in the future, at least $50,000 in Virtus Mutual Funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	50,000
Other Expenses, New Fund, Based on Estimates [Text]	rr_OtherExpensesNewFundBasedOnEstimates	Estimated for current fiscal year.
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 and that the fund’s operating expenses remain the same and that the expense reimbursement arrangement remains in place only for the period indicated. 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	The fund pursues capital appreciation in the small-cap international arena. The fund invests in a select group of small-cap companies believed by the subadviser to be undervalued relative to their future market growth potential. The investment strategy emphasizes companies that the subadviser believes to have a sustainable competitive advantage, strong management and low financial risk and to be able to grow over market cycles. Under normal circumstances, the fund invests at least 80% of its assets in equity securities of non-U.S. small capitalization companies. As of the date of the Prospectus, the fund’s subadviser considers small-capitalization companies to be those companies that, at the time of initial purchase, have market capitalizations of between $75 million and $5 billion. 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 “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. Equity securities in which the fund invests include common stocks, preferred stocks and American Depositary Receipts (ADRs). The fund may invest in emerging markets issuers. Generally, the fund invests in approximately 30-60 securities at any given time and invests in issuers in approximately 20 countries.
Risk [Heading]	rr_RiskHeading	Principal Risks
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	The fund may not achieve its objective, 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. The principal risks of investing in the fund are: 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. 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 smaller companies may be more volatile than investments in larger companies. 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 economic, political or other developments. Limited Number of Investments Risk. The risk that the fund’s portfolio will be more susceptible to factors adversely affecting issuers of securities in the fund’s portfolio than would a fund holding a greater number of securities. 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 companies and/or general economic conditions. Price changes may be temporary or may last for extended periods. Small Market Capitalization Companies Risk. The risk that the fund’s investments in small market capitalization companies will increase the volatility and risk of loss to the fund, as compared with investments in larger, more established companies.
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 fund has not had a full calendar year of operations; therefore, performance information is not shown.
Performance One Year or Less [Text]	rr_PerformanceOneYearOrLess	The fund has not had a full calendar year of operations; therefore, performance information is not shown.
Virtus International Small-Cap 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	1.00%	[1]
Management Fees	rr_ManagementFeesOverAssets	1.00%
Distribution and Shareholder Servicing (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets	0.93%	[2]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.18%
Less: Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.58%)	[3]
Total Annual Fund Operating Expenses After Fee Waiver or Expense Reimbursement (if Any)	rr_NetExpensesOverAssets	1.60%
1 Year	rr_ExpenseExampleYear01	728
3 Years	rr_ExpenseExampleYear03	1,165
1 Year	rr_ExpenseExampleNoRedemptionYear01	728
3 Years	rr_ExpenseExampleNoRedemptionYear03	1,165
Virtus International Small-Cap 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%	[4]
Management Fees	rr_ManagementFeesOverAssets	1.00%
Distribution and Shareholder Servicing (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses	rr_OtherExpensesOverAssets	0.93%	[2]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.93%
Less: Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.58%)	[3]
Total Annual Fund Operating Expenses After Fee Waiver or Expense Reimbursement (if Any)	rr_NetExpensesOverAssets	2.35%
1 Year	rr_ExpenseExampleYear01	338
3 Years	rr_ExpenseExampleYear03	852
1 Year	rr_ExpenseExampleNoRedemptionYear01	238
3 Years	rr_ExpenseExampleNoRedemptionYear03	852
Virtus International Small-Cap 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	1.00%
Distribution and Shareholder Servicing (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.93%	[2]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.93%
Less: Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.58%)	[3]
Total Annual Fund Operating Expenses After Fee Waiver or Expense Reimbursement (if Any)	rr_NetExpensesOverAssets	1.35%
1 Year	rr_ExpenseExampleYear01	137
3 Years	rr_ExpenseExampleYear03	550
1 Year	rr_ExpenseExampleNoRedemptionYear01	137
3 Years	rr_ExpenseExampleNoRedemptionYear03	550

[1] Generally, Class A Shares are not subject to any charges by the Fund when redeemed; however, a contingent deferred sales charge may be imposed on certain redemptions within 18 months on exchanges from a Virtus non-money market fund into a Virtus money market fund and purchases on which a finder's fee has been paid. The 18-month period begins on the last day of the month preceding the month in which the purchase was made.

[2] Estimated for current fiscal year.

[3] The fund's investment adviser has contractually agreed to limit the fund's total operating expenses (excluding interest, taxes and extraordinary expenses) so that such expenses do not exceed 1.60% for Class A Shares, 2.35% for Class C Shares and 1.35% for Class I Shares through January 31, 2014. 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 under these arrangements for a period of three years following the fiscal year in which such reimbursement occurred.

[4] The deferred sales charge is imposed on Class C Shares redeemed during the first year only.