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Unconstrained Emerging Markets Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Unconstrained Emerging Markets Bond Fund
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Unconstrained Emerging Markets Bond Fund seeks total return, consisting of income and capital appreciation.
Expense [Heading] rr_ExpenseHeading FUND FEES AND EXPENSES
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for Class A sales charge discounts if you and your family (includes spouse and children under age 21) invest, or agree to invest in the future, at least $25,000, in the aggregate, in Classes A and C of the VanEck Funds. More information about these and other discounts is available from your financial professional and in the “Shareholder Information—Sales Charges” section on page 18 of this prospectus, in the “Availability of Discounts” section on page 50 of the Fund’s Statement of Additional Information (“SAI”) and, with respect to purchases of shares through specific intermediaries, in Appendix A to this prospectus, entitled “Intermediary Sales Charge Discounts and Waivers.”
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 May 01, 2018
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 that the Fund pays 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 546% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 546.00%
Expense Example [Heading] rr_ExpenseExampleHeading Expense Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The following 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 either redeem all of your shares at the end of these periods or continue to hold them. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same, and applies fee waivers and/or expense reimbursements, if any, for the periods indicated above under “Annual Fund Operating Expenses”. Although your actual expenses may be higher or lower, based on these assumptions, your costs would be:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Sold
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption Held
Strategy [Heading] rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal conditions, the Fund invests at least 80% of its net assets in emerging market debt securities. An instrument will qualify as an emerging market debt security if it is either (i) issued by an emerging market government, quasi-government or corporate entity (regardless of the currency in which it is denominated) or (ii) denominated in the currency of an emerging market country (regardless of the location of the issuer). The Fund may also invest in non-emerging market debt securities. There is no limit on the amount the Fund may invest in one country or in securities denominated in one currency. The Fund may also invest in debt securities rated below investment grade (“junk bonds”). The Fund is considered to be “non-diversified” which means that it may invest a larger portion of its assets in a single issuer. The Fund may engage in active and frequent trading of portfolio securities.


The Fund invests in debt issued in emerging market and developed market currencies by governments and government-owned, controlled, or related entities (and their agencies and subdivisions), and by corporations. The Fund may invest in corporate bonds, debentures, notes, commercial paper, time deposits, and certificates of deposit, as well as debt obligations, which may have a call on a common stock or commodity by means of a conversion privilege or attached warrants.


The Fund may also invest in emerging market or developed market currencies. The Fund may use derivative instruments denominated in any currency to enhance return, hedge (or protect) the value of its assets against adverse movements in commodity prices, currency exchange rates, interest rates and movements in the securities markets, manage certain investment risks and/or as a substitute for the purchase or sale of securities, currencies or commodities. The Fund may also use derivative instruments to implement “cross-hedging” strategies, which involve the use of one currency to hedge against the decline in the value of another currency, or to hedge the value of a currency that is embedded in the value of another currency (for example, the value of the Euro that may be embedded in the Polish zloty). The Fund expects to use forward currency contracts; futures on securities, indices, currencies, commodities, swaps and other investments; options; and interest rate swaps, cross-currency swaps, total return swaps and credit default swaps. The Fund may also invest in credit-linked notes. The notional value of a cash-settled forward currency contract or other derivative instrument on an emerging market currency (or a currency that is embedded in an emerging market currency) or security (including any security that is a reference security for a credit default swap) will be treated as an emerging market debt security for purposes of complying with the Fund’s policy of investing at least 80% of its net assets in emerging market debt securities.


The Adviser has broad discretion to identify countries that it considers to qualify as emerging markets. The Adviser selects emerging market countries and currencies that the Fund will invest in based on the Adviser’s evaluation of economic fundamentals, legal structure, political developments and other specific factors the Adviser believes to be relevant. The Fund’s investment strategy normalizes countries’ economic fundamentals and compares them to the valuations of the relevant asset prices, particularly the relevant currency’s valuation, the relevant currency’s interest rate, and the relevant hard-currency security’s credit spread. The Fund may invest in instruments whose return is based on the return of an emerging market security such as a derivative instrument, rather than investing directly in emerging market securities.


The Fund’s holdings may include issues denominated in currencies of emerging countries, investment companies (like country funds) that invest in emerging countries, and American Depositary Receipts, and similar types of investments, representing emerging market securities. The Fund may purchase securities of any maturity or duration. Duration is a measure of the expected life of a fixed income security that is used to determine the sensitivity of a security’s price to changes in interest rates. The longer a security’s duration, the more sensitive it will be to changes in interest rates. Similarly, a fund with a longer average portfolio duration will be more sensitive to changes in interest rates than a fund with a shorter average portfolio duration. By way of example, the price of a bond fund with an average duration of five years would be expected to fall approximately 5% if interest rates rose by one percentage point.


The Fund may invest up to 20% of its net assets in securities issued by other investment companies (each an “Underlying Fund”), including exchange-traded funds (“ETFs”). The Fund may also invest in money market funds, but these investments are not subject to this limitation. The Fund may invest in ETFs to participate in, or gain rapid exposure to, certain market sectors, or when direct investments in certain countries are not permitted.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

There is no assurance that the Fund will achieve its investment objective. The Fund’s share price and return will fluctuate with changes in the market value of the Fund’s portfolio securities. Accordingly, an investment in the Fund involves the risk of losing money.


Below Investment Grade Securities. Below investment grade securities (sometimes referred to as “junk bonds”) are more speculative than higher-rated securities. These securities have a much greater risk of default and may be more volatile than higher-rated securities of similar maturity. These securities may be less liquid and more difficult to value than higher-rated securities.


Credit. Credit risk is the risk that the issuer or guarantor of a debt security or the counterparty to an over-the-counter contract (including many derivatives) will be unable or unwilling to make timely principal, interest or settlement payments or otherwise honor its obligations. The Fund invests in debt securities that are subject to varying degrees of risk that the issuers of the securities will have their credit ratings downgraded or will default, potentially reducing the value of the securities.


Currency Management Strategies. Currency management strategies, including the use of forward currency contracts and other derivatives, may substantially change the Fund’s exposure to currencies and currency exchange rates and could result in losses to the Fund if currencies do not perform as the Adviser anticipates.


Debt Securities. Debt securities are subject to credit risk and interest rate risk. Credit risk refers to the possibility that the issuer of a debt security will be unable to make interest payments or repay principal when it becomes due. Interest rate risk refers to fluctuations in the value of a debt security resulting from changes in the general level of interest rates. Debt securities with longer durations have higher risk and volatility.


Derivatives. The use of derivatives, such as swap agreements, options, warrants, futures contracts, currency forwards and structured notes, presents risks different from, and possibly greater than, the risks associated with investing directly in traditional securities. The use of derivatives can lead to losses because of adverse movements in the price or value of the underlying currency, security, asset, index or reference rate. Derivative strategies often involve leverage, which may exaggerate a loss, potentially causing the Fund to lose more money than it would have lost had it invested in the underlying security. Also, a liquid secondary market may not always exist for the Fund’s derivative positions at times when the Fund might wish to terminate or sell such positions. Over the counter instruments may be illiquid, and transactions in derivatives traded in the over-the-counter market are subject to counterparty risk.


Emerging Market Securities. Emerging market securities typically present even greater exposure to the risks described under “Foreign Securities” and may be particularly sensitive to certain economic changes. Emerging market securities are exposed to a number of risks that may make these investments volatile in price or difficult to trade.


Foreign Currency. Investments in global markets or securities that are denominated in foreign currencies give rise to foreign currency exposure. The U.S. dollar value of these investments will vary depending on changes in exchange rates and the performance of the underlying assets.


Foreign Securities. Foreign investments are subject to greater risks than U.S. domestic investments. These additional risks may include exchange rate fluctuations and exchange controls; less publicly available information; more volatile or less liquid securities markets; and the possibility of arbitrary action by foreign governments, or political, economic or social instability. Foreign companies also may be subject to significantly higher levels of taxation than U.S. companies, including potentially confiscatory levels of taxation, thereby reducing the earnings potential of such foreign companies.


Hedging. Losses or gains generated by a derivative or other instrument or practice used by the Fund for hedging purposes (including for hedging interest rate risk and credit risk) should be substantially offset by gains or losses on the hedged investment. However, the Fund is exposed to the risk that changes in the value of a hedging instrument will not match those of the investment being hedged.


Investments in Other Investment Companies. The Fund’s investment in another investment company may subject the Fund indirectly to the underlying risks of the investment company. The Fund also will bear its share of the underlying investment company’s fees and expenses, which are in addition to the Fund’s own fees and expenses.


Latin American Issuers. Investments in securities of Latin American issuers involve special considerations not typically associated with investments in securities of issuers located in the United States. The economies of certain Latin American countries have, at times, experienced high interest rates, economic volatility, inflation, currency devaluations and high unemployment rates. In addition, commodities (such as oil, gas and minerals) represent a significant percentage of the region’s exports and many economies in this region are particularly sensitive to fluctuations in commodity prices. Adverse economic events in one country may have a significant adverse effect on other countries of this region. Most Latin American countries have experienced, at one time or another, severe and persistent levels of inflation, including, in some cases, hyperinflation. This has, in turn, led to high interest rates, extreme measures by governments to keep inflation in check, and a generally debilitating effect on economic growth.


Management. Investment decisions made by the Adviser in seeking to achieve the Fund’s investment objective may not produce the returns expected by the Adviser, may cause a decline in the value of the securities held by the Fund and, in turn, cause the Fund’s shares to lose value or underperform other funds with similar investment objectives.


Market. Market risk refers to the risk that the market prices of securities that the Fund holds will rise or fall, sometimes rapidly or unpredictably. In general, equity securities tend to have greater price volatility than debt securities.


Operational. The Fund is exposed to operational risk arising from a number of factors, including but not limited to, human error, processing and communication errors, errors of the Fund’s service providers, counterparties or other third-parties, failed or inadequate processes and technology or system failures.


Non-Diversification. A non-diversified fund’s greater investment in a single issuer makes the fund more susceptible to financial, economic or market events impacting such issuer. A decline in the value of or default by a single security in the non-diversified fund’s portfolio may have a greater negative effect than a similar decline or default by a single security in a diversified portfolio.


Portfolio Turnover. The Fund may engage in active and frequent trading of portfolio securities and thus may experience a high portfolio turnover rate. This may result in significant taxable capital gains as a result of the frequent trading of the Fund’s portfolio securities and the Fund will incur transaction costs in connection with buying and selling the securities, which may lower the Fund’s return.


Sectors. The Fund may be subject to greater risks and market fluctuations than a fund whose portfolio has exposure to a broader range of sectors. The Fund may be susceptible to financial, economic, political or market events, as well as government regulation, impacting the energy and sovereign bond sectors.
Risk Lose Money [Text] rr_RiskLoseMoney The Fund’s share price and return will fluctuate with changes in the market value of the Fund’s portfolio securities. Accordingly, an investment in the Fund involves the risk of losing money.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus A non-diversified fund’s greater investment in a single issuer makes the fund more susceptible to financial, economic or market events impacting such issuer. A decline in the value of or default by a single security in the non-diversified fund’s portfolio may have a greater negative effect than a similar decline or default by a single security in a diversified portfolio.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading PERFORMANCE
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total returns compare with those of a broad measure of market performance and one or more other performance measures. For instance, the 50% J.P. Morgan Emerging Market Bond Index Global Diversified Index/50% J.P. Morgan Government Bond Index-Emerging Markets Global Diversified Index, shown in the table, is a blended, unmanaged index created by the Adviser. The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. The annual returns in the bar chart are for the Fund’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be lower than those shown. Additionally, large purchases and/or redemptions of shares of a class, relative to the amount of assets represented by the class, may cause the annual returns for each class to differ. Updated performance information for the Fund is available on the VanEck website at vaneck.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total returns compare with those of a broad measure of market performance and one or more other performance measures.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress vaneck.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 Class A: Annual Total Returns (%) as of 12/31
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The annual returns in the bar chart are for the Fund’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be lower than those shown.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

 

 

 

 

 

Best Quarter:

  

+5.64%

  

2Q ’14

Worst Quarter:

  

-11.07%

  

2Q ’13
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2014
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 5.64%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2013
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (11.07%)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
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 The after-tax return information shown above does not apply to Fund shares held through a tax-deferred account, such as a 401(k) plan or Investment Retirement Account.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown These returns are shown for one class of shares only; after-tax returns for the other classes may vary.
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns as of 12/31/16
Unconstrained Emerging Markets Bond Fund | 50% J.P. Morgan Emerging Market Bond Index Global Diversified Index/50% J.P. Morgan Government Bond Index-Emerging Markets Global Diversified Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 10.15%
Unconstrained Emerging Markets Bond Fund | J.P. Morgan Government Bond Index-Emerging Markets Global Diversified Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 9.94%
Life of Class rr_AverageAnnualReturnSinceInception (2.82%)
Unconstrained Emerging Markets Bond Fund | J.P. Morgan Emerging Market Bond Index Global Diversified® Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 10.15%
Life of Class rr_AverageAnnualReturnSinceInception 4.73%
Unconstrained Emerging Markets Bond 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 the net asset value or purchase price) rr_MaximumDeferredSalesChargeOverOther none [1]
Management Fees rr_ManagementFeesOverAssets 0.80%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.63%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.68%
Fees Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.43%) [2]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.25%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock A contingent deferred sales charge for Class A shares of 1.00% for one year applies to redemptions of qualified commissionable shares purchased at or above the $1 million breakpoint level.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for Class A sales charge discounts if you and your family (includes spouse and children under age 21) invest, or agree to invest in the future, at least $25,000, in the aggregate, in Classes A and C of the VanEck Funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 25,000
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 695
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,035
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,397
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,414
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 695
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 1,035
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,397
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,414
Annual Return 2013 rr_AnnualReturn2013 (4.70%)
Annual Return 2014 rr_AnnualReturn2014 1.83%
Annual Return 2015 rr_AnnualReturn2015 (13.60%)
Annual Return 2016 rr_AnnualReturn2016 6.06%
1 Year rr_AverageAnnualReturnYear01 (0.11%)
Life of Class rr_AverageAnnualReturnSinceInception (1.58%)
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 09, 2012
Unconstrained Emerging Markets Bond Fund | Class A | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (1.12%) [3]
Life of Class rr_AverageAnnualReturnSinceInception (2.62%) [3]
Unconstrained Emerging Markets Bond Fund | Class A | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (0.06%)
Life of Class rr_AverageAnnualReturnSinceInception (1.59%)
Unconstrained Emerging Markets Bond 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 the net asset value or purchase price) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees rr_ManagementFeesOverAssets 0.80%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 1.21%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 3.01%
Fees Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (1.06%) [2]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.95%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for Class A sales charge discounts if you and your family (includes spouse and children under age 21) invest, or agree to invest in the future, at least $25,000, in the aggregate, in Classes A and C of the VanEck Funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 25,000
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 298
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 831
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,489
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,253
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 198
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 831
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,489
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,253
1 Year rr_AverageAnnualReturnYear01 4.45%
Life of Class rr_AverageAnnualReturnSinceInception (0.98%)
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 09, 2012
Unconstrained Emerging Markets Bond 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 the net asset value or purchase price) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.80%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.16%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.96%
Fees Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.01%) [2]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 0.95%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 97
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 305
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 530
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,177
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 97
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 305
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 530
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,177
1 Year rr_AverageAnnualReturnYear01 6.45%
Life of Class rr_AverageAnnualReturnSinceInception 0.02%
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 09, 2012
Unconstrained Emerging Markets Bond Fund | Class Y  
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 the net asset value or purchase price) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.80%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.39%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.19%
Fees Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.19%) [2]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.00%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 102
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 359
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 636
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,426
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 102
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 359
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 636
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,426
1 Year rr_AverageAnnualReturnYear01 6.32%
Life of Class rr_AverageAnnualReturnSinceInception (0.07%)
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 09, 2012
[1] A contingent deferred sales charge for Class A shares of 1.00% for one year applies to redemptions of qualified commissionable shares purchased at or above the $1 million breakpoint level.
[2] Van Eck Associates Corporation (the "Adviser") has agreed to waive fees and/or pay Fund expenses to the extent necessary to prevent the operating expenses of the Fund (excluding acquired fund fees and expenses, interest expense, trading expenses, dividends and interest payments on securities sold short, taxes and extraordinary expenses) from exceeding 1.25% for Class A, 1.95% for Class C, 0.95% for Class I, and 1.00% for Class Y of the Fund's average daily net assets per year until May 1, 2018. During such time, the expense limitation is expected to continue until the Board of Trustees acts to discontinue all or a portion of such expense limitation.
[3] 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. These returns are shown for one class of shares only; after-tax returns for the other classes may vary. Actual after-tax returns depend on your individual tax situation and may differ from those shown in the preceding table. The after-tax return information shown above does not apply to Fund shares held through a tax-deferred account, such as a 401(k) plan or Investment Retirement Account.