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IQ MacKay Municipal Insured ETF  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading IQ MacKay Municipal Insured ETF
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The IQ MacKay Municipal Insured ETF (the “Fund”) seeks current income exempt from federal income tax.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes fees and expenses that you may pay if you buy, sell or hold shares of the Fund (“Shares”). Investors may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example set forth below.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment):None
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 Aug. 31, 2022
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 other instruments. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when 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. This rate excludes the value of portfolio securities received or delivered as a result of in-kind creations or redemptions of the Shares. During the most recent fiscal year, the Fund’s portfolio turnover rate was 36% of the average value of the portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 36.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The Total Annual Fund Operating Expenses may not correlate to the ratio of expenses to average net assets as reported in the “Financial Highlights” section of the Prospectus, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees & Expenses.
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 funds. This example does not take into account brokerage commissions that you pay when purchasing or selling Shares of the Fund.
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 at current levels. The return of 5% and estimated expenses are for illustration purposes only, and should not be considered indicators of expected Fund expenses or performance, which may be greater or less than the estimates. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund is an actively managed ETF and thus does not seek to replicate the performance of a specific index. Instead, the Fund uses an active management strategy to meet its investment objective. Consequently, investors should not expect the Fund’s returns to track the returns of any index or market for any period of time.
The Fund, under normal circumstances, invests at least 80% of its assets (net assets plus borrowings for investment purposes) in: (i) debt securities whose interest is, in the opinion of bond counsel for the issuer at the time of issuance, exempt from federal Income tax (“Municipal Bonds”); and (ii) debt securities covered by an insurance policy guaranteeing the payment of principal and interest. The Fund typically invests at least 80% of its net assets in Municipal Bonds that are rated investment grade by at least one independent rating agency (i.e., within the highest four quality ratings by Moody’s Investors Service, Inc., Standard & Poor’s Ratings Services or Fitch Ratings, Inc.). If independent rating agencies assign different ratings to the same security, the Fund will use the higher rating for purposes of determining the security’s credit quality. The Fund generally will maintain a dollar-weighted average duration of 3 to 15 years.
Municipal Bonds are issued by or on behalf of the District of Columbia, states, territories, commonwealths and possessions of the United States and their political subdivisions and agencies, authorities and instrumentalities. The Fund may not invest more than 20% of its net assets in tax-exempt securities subject to the federal alternative minimum tax.
Insured Municipal Bonds are covered by insurance policies that guarantee the timely payment of principal and interest. The Fund generally purchases Municipal Bonds that have insurance in place so the Fund does not pay insurance premiums directly. The premium costs, however, are reflected in a lower yield and/or higher price for the insured Municipal Bonds. When beneficial, the Fund may purchase insurance for an uninsured bond directly from a qualified Municipal Bond insurer, in which case the Fund pays the insurance premium directly to the insurance company. It is important to note that insurance does not guarantee the market value of an insured security, or the Fund’s share price or distributions, and shares of the Fund are not insured.
The Fund may invest more than 25% of its total assets in Municipal Bonds that are related in such a way that an economic, business or political development or change affecting one such security could also affect the other securities. However, the Fund’s investments will be diversified among a minimum of ten different sectors of the Municipal Bond market, such as education, transportation and local general obligation. The Fund’s investments will be diversified among at least 15 different states, with no more than 30% of the Fund’s securities invested in municipal securities from a single state. Some of the Fund’s earnings may be subject to federal tax and most may be subject to state and local taxes.
MacKay Shields LLC’s (the “Subadvisor”) investment process begins with an assessment of macro factors that may impact the Municipal Bond market, including, tax rates, U.S. Treasury rates, and global economic data, as well as other regulatory, tax, governmental, and technical factors that may impact the Municipal Bond market. Additionally, the Subadvisor may give consideration to certain environmental, social and governance (“ESG”) criteria when evaluating an investment opportunity. Following the assessment of these factors, the Subadvisor develops an investment strategy to position the Fund among various sectors of the Municipal Bond market and different states. The Subadvisor then employs a fundamental, “bottom-up” credit research analysis to select individual Municipal Bonds.
The Subadvisor may sell a security if it no longer believes the security will contribute to meeting the investment objective of the Fund. In considering whether to sell a security, the Subadvisor may evaluate, among other things, the condition of the economy and meaningful changes in the issuer’s financial condition.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration The Fund, under normal circumstances, invests at least 80% of its assets (net assets plus borrowings for investment purposes) in: (i) debt securities whose interest is, in the opinion of bond counsel for the issuer at the time of issuance, exempt from federal Income tax (“Municipal Bonds”); and (ii) debt securities covered by an insurance policy guaranteeing the payment of principal and interest. The Fund typically invests at least 80% of its net assets in Municipal Bonds that are rated investment grade by at least one independent rating agency (i.e., within the highest four quality ratings by Moody’s Investors Service, Inc., Standard & Poor’s Ratings Services or Fitch Ratings, Inc.). If independent rating agencies assign different ratings to the same security, the Fund will use the higher rating for purposes of determining the security’s credit quality. The Fund generally will maintain a dollar-weighted average duration of 3 to 15 years.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with all investments, there are certain risks of investing in the Fund. The Fund’s Shares will change in value and you could lose money by investing in the Fund. An investment in the Fund does not represent a complete investment program. An investment in the Fund is not a bank deposit and it is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, the Advisor or any of its affiliates. You should consider carefully the following risks before investing in the Fund.
Authorized Participant Concentration Risk
Only certain large institutions may engage in creation or redemption transactions directly with the Fund (each, an “Authorized Participant”). The Fund has a limited number of institutions that may act as Authorized Participants on an agency basis (i.e., on behalf of other market participants). To the extent that those Authorized Participants exit the business or are unable to proceed with creation and/or redemption orders with the Fund and no other Authorized Participant is able to step forward to engage in creation and redemption transactions with the Fund, Shares may be more likely to trade at a premium or discount to NAV and possibly face trading halts and/or delisting.
Cash Transactions Risk
The Fund currently intends to effect creations and redemptions principally for cash, rather than for in-kind securities. For this reason, the Fund may be required to sell portfolio securities in order to obtain the cash needed to distribute redemption proceeds. The Fund may recognize a capital gain on these sales that might not have been incurred if the Fund had made a redemption in-kind. This may decrease the tax efficiency of the Fund compared to ETFs that utilize an in-kind redemption process.
Credit Risk
Credit risk is the risk that the issuer or guarantor of a debt instrument or the counterparty to a derivatives contract, repurchase agreement or loan of portfolio securities will be unable or unwilling to make its timely interest and/or principal payments when due or otherwise honor its obligations. Changes in an issuer’s or counterparty’s credit rating or the market’s perception of an issuer’s or counterparty’s creditworthiness may also adversely affect the value of the Fund’s investment in that issuer. The degree of credit risk depends on an issuer’s or counterparty’s financial condition and on the terms of an obligation.
Cyber Security Risk
The Fund is susceptible to operational risks through breaches in cyber security. Such events may cause the Fund to lose proprietary information, suffer data corruption or lose operational capacity and could cause the Fund to incur regulatory penalties, reputational damage, additional compliance costs associated with corrective measures and/or financial loss. In addition, cyber security breaches of the securities issuers or the Fund’s third-party service providers can also subject the Fund to many of the same risks associated with direct cyber security breaches. Although the Fund has established risk management systems designed to reduce the risks associated with cyber security, there is no guarantee that such efforts will succeed.
Focused Investment Risk
To the extent that the Fund invests a large percentage of its assets in a single asset class or the securities of issuers within the same country, group of countries, region, industry, group of industries or sector, an adverse economic, market, political or regulatory development may affect the value of the Fund’s investments more than if the Fund were more broadly diversified. Different asset classes, countries, groups of countries, regions, industries, groups of industries or sectors tend to go through cycles of outperformance and underperformance in comparison to each other and to the general financial markets.
Income Risk
The Fund’s income may decline when interest rates fall or if there are defaults in its portfolio. This decline can occur because the Fund may subsequently invest in lower-yielding securities when securities in its portfolio mature or the Fund otherwise needs to purchase additional securities.
Interest Rate Risk
An increase in interest rates may cause the value of securities held by the Fund to decline. Fixed income securities with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than securities with shorter durations or floating or adjustable interest rates. The negative impact on the Fund from potential interest rate increases could be swift and significant, including falling market values, increased redemptions and reduced liquidity. The Fund may be subject to a greater risk of rising interest rates than would normally be the case due to the current period of historically low rates and the effect of potential government fiscal policy initiatives and resulting market reaction to those initiatives.
When interest rates rise, certain obligations will be paid off by the issuer (or other obligated party) more slowly than anticipated, causing the value of these securities to fall. As a result, in a period of rising interest rates, securities may exhibit additional volatility and may lose value. The value of securities with longer maturities generally changes more in response to changes in interest rates than does the value of securities with shorter maturities.
During periods of falling interest rates, an issuer of a callable security held by the Fund may “call” or repay the security before its stated maturity, which may result in the Fund having to reinvest the proceeds in securities with lower yields, resulting in a decline in the Fund’s income, or in securities with greater risks or with other less favorable features.
The terms of floating rate notes and other instruments may be tied to the London Interbank Offered Rate (“LIBOR”), which functions as a reference rate or benchmark. It is anticipated that LIBOR will be discontinued at the end of 2021, which may cause increased volatility and illiquidity in the markets for instruments with terms tied to LIBOR or other adverse consequences, such as decreased yields and reduction in value, for these instruments. These events may adversely affect the Fund and its investments in such instruments.
Issuer Risk
The performance of the Fund depends on the performance of individual securities to which the Fund has exposure. Changes to the financial condition or credit rating of an issuer of those securities may cause the value of the securities to decline.
Liquidity Risk
Liquidity risk exists when particular investments are difficult to purchase or sell. Certain investments may be subject to restrictions on resale, trade over-the-counter or in limited volume, or lack an active trading market. Accordingly, the Fund may not be able to sell or close out of such investments at favorable times or prices (or at all), or at the prices approximating those at which the Fund currently values them. Illiquid securities may trade at a discount from comparable, more liquid investments and may be subject to wide fluctuations in market value.
Market Risk
Market risks include political, regulatory, market and economic developments, including developments that impact specific economic sectors, industries or segments of the market, which may affect the Fund’s value. Turbulence in financial markets, tariffs and other protectionist measures, political developments and uncertainty, central bank policy, and reduced liquidity in equity, credit and fixed income markets may negatively affect many issuers worldwide, which could have an adverse effect on the Fund. During a general downturn in the securities markets, multiple asset classes may be negatively affected. Geopolitical and other events, including war, terrorism, economic uncertainty, trade disputes, public health crises and related geopolitical events have led, and in the future may lead, to disruptions in the US and world economies and markets, which may increase financial market volatility and have significant adverse direct or indirect effects on a Fund and its investments. Market disruptions could cause the Fund to lose money, experience significant redemptions, and encounter operational difficulties. Although multiple asset classes may be affected by a market disruption, the duration and effects may not be the same for all types of assets.
Municipal Bond Market Liquidity Risk
Inventories of Municipal Bonds held by brokers and dealers may decrease, lessening their ability to make a market in these securities. Any reduction in market-making capacity has the potential to decrease the Fund’s ability to buy or sell Municipal Bonds and increase price volatility and trading costs, particularly during periods of economic or market stress. As a result, the Fund may be forced to accept a lower price to sell a Municipal Bond, to sell other securities to raise cash, or to give up an investment opportunity, any of which could have a negative effect on performance.
Municipal Bond Risk
Issuers, including governmental issuers, may be unable to pay their obligations as they come due. The values of Municipal Bonds that depend on a specific revenue source to fund their payment obligations may fluctuate as a result of actual or anticipated changes in the cash flows generated by the revenue source or changes in the priority of the municipal obligation to receive the cash flows generated by the revenue source. The values of Municipal Bonds held by the Fund may be adversely affected by local political and economic conditions and developments. Adverse conditions in an industry significant to a local economy could have a correspondingly adverse effect on the financial condition of local issuers. This risk would be heightened to the extent that the Fund invests a substantial portion of its assets in Municipal Bonds issued pursuant to similar projects or whose interest is paid solely from revenues of similar projects. In addition, income from Municipal Bonds held by the Fund could be declared taxable because of, among other things, unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service or state tax authorities, or noncompliant conduct of an issuer or other obligated party. Loss of tax-exempt status may cause interest received and distributed to shareholders by the Fund to be taxable and may result in a significant decline in the values of such municipal securities. There are various different types of Municipal Bonds, each with its own unique risk profile. Some of these risks include:
•
General Obligation Bonds Risk—timely payments depend on the issuer’s credit quality, ability to raise tax revenues and ability to maintain an adequate tax base;
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•
Revenue Bonds (including Industrial Development Bonds) Risk—timely payments depend on the money earned by the particular facility or class of facilities, or the amount of revenues derived from another source, and may be negatively impacted by the general credit of the user of the facility;
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•
Private Activity Bonds Risk—municipalities and other public authorities issue private activity bonds to finance development of industrial facilities for use by a private enterprise, which is solely responsible for paying the principal and interest on the bonds, and payment under these bonds depends on the private enterprise’s ability to do so;
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•
Moral Obligation Bonds Risk—moral obligation bonds are generally issued by special purpose public authorities of a state or municipality. If the issuer is unable to meet its obligations, repayment of these bonds becomes a moral commitment, but not a legal obligation, of the state or municipality;
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•
Municipal Notes Risk—municipal notes are shorter-term municipal debt obligations that pay interest that is, in the opinion of bond counsel for the issuer at the time of issuance, generally excludable from gross income for federal income tax purposes (except that the interest may be includable in taxable income for purposes of the federal alternative minimum tax) and that have a maturity that is generally one year or less. If there is a shortfall in the anticipated proceeds, the notes may not be fully repaid and the Fund may lose money; and
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•
Municipal Lease Obligations Risk—in a municipal lease obligation, the issuer agrees to make payments when due on the lease obligation. Although the issuer does not pledge its unlimited taxing power for payment of the lease obligation, the lease obligation is secured by the leased property.
​
Municipal Bond Valuation Risk
The Municipal Bonds in which the Fund invests are typically valued by a pricing service utilizing a range of market-based inputs and assumptions, including readily available market quotations obtained from broker-dealers making markets in such securities, cash flows and transactions for comparable instruments. There is no assurance that the Fund will be able to sell a portfolio security at the price established by the pricing service, which could result in a loss to the Fund.
Municipal Insurance Risk
The Fund’s investments may include investments in insured Municipal Bonds. Municipal security insurance does not guarantee the value either of individual municipal securities or of Shares of the Fund. In addition, a municipal security insurance policy generally will not cover: (i) repayment of a municipal security before maturity (redemption), (ii) prepayment or payment of an acceleration premium (except for a mandatory sinking fund redemption) or any other provision of a bond indenture that advances the maturity of the bond or (iii) non-payment of principal or interest caused by negligence or bankruptcy of the paying agent. A mandatory sinking fund redemption may be a provision of a municipal security issue whereby part of the municipal security issue may be retired before maturity. Market conditions or changes to ratings criteria could adversely impact the ratings of Municipal Bond insurance companies. Downgrades and withdrawal of ratings from Municipal Bond insurers have substantially limited the availability of insurance sought by Municipal Bond issuers, thereby reducing the supply of insured Municipal Bonds that meet the Fund’s investment guidelines or the ability of the Fund to purchase insurance on Municipal Bonds held by the Fund. A rating downgrade of a Municipal Bond insurer could negatively impact the market value of insured Municipal Bonds held by the Fund. If the insurer of a defaulted Municipal Bond were to become unable or unwilling to pay the principal or interest on the defaulted Municipal Bond, the Fund would incur losses.
Operational Risk
The Fund is exposed to operational risks 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 systems failures. The Fund and Advisor seek to reduce these operational risks through controls and procedures. However, these measures do not address every possible risk and may be inadequate to address significant operational risks.
Portfolio Management Risk
The Fund is subject to portfolio management risk because it is an actively managed portfolio. In managing the Fund’s investment portfolio, the portfolio managers will apply investment techniques and risk analyses that may not produce the desired result or, while it may be the desired result, may underperform other types of investment strategies. The application of ESG criteria may result in the Fund (i) having exposure to certain securities or industry sectors that are significantly different than the composition of the Fund’s benchmark; and (ii) performing differently than other funds and strategies in its peer group that do not take into account ESG criteria or the Fund’s benchmark. There can be no guarantee that the Fund will meet its investment objective(s).
Secondary Market Trading Risk
Although the Fund’s Shares are listed for trading on one or more securities exchanges, there can be no assurance that an active trading market for such Shares will develop or be maintained by market makers or Authorized Participants. In general, the trading of Shares on securities exchanges is subject to the risk of irregular trading activity and wide “bid/ask” spreads (which may be especially pronounced for smaller funds). Additionally, market makers are under no obligation to make a market in the Fund’s Shares and Authorized Participants are not obligated to submit purchase or redemption orders for Creation Units. In the event market makers cease making a market in the Fund’s Shares or Authorized Participants stop submitting purchase or redemption orders for Creation Units, the Fund’s Shares may trade at a larger premium or discount to its NAV. Wide bid-ask spreads and large premiums or discounts to NAV are likely to lead to an investor buying his or her shares at a market price that is more than their value, and selling those shares at a market price that is less than their value.
Trading Price Risk
Shares of the Fund trade on securities exchanges at prices at, above or below the Fund’s most recent NAV. The NAV of the Fund is calculated at the end of each business day and fluctuates with changes in the market value of the Fund’s holdings. The trading price of the Fund’s Shares fluctuates continuously throughout trading hours based on both market supply of and demand for Shares and the underlying value of the Fund’s portfolio holdings or NAV. As a result, the trading prices of the Fund’s Shares may deviate significantly from NAV during periods of market volatility. Any of these factors, among others, may lead to the Fund’s Shares trading at a premium or discount to NAV. Although it is generally expected that the market price of the Shares of the Fund will approximate the Fund’s NAV, there may be times when the market price and the NAV vary significantly. Thus, an investor may pay more than NAV when purchasing Shares and receive less than NAV when selling Shares.
Risk Lose Money [Text] rr_RiskLoseMoney The Fund’s Shares will change in value and you could lose money by investing in the Fund.
RIsk Not Insured [Text] rr_RiskNotInsured An investment in the Fund is not a bank deposit and it is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, the Advisor or any of its affiliates.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart that follows shows the annual total returns of the Fund for a full calendar year. The table that follows the bar chart shows the Fund’s average annual total return, both before and after taxes. The bar chart and table provide an indication of the risks of investing in the Fund by comparing the Fund’s performance from year to year and by showing how the Fund’s average annual returns for one calendar year compared with its benchmark and additional broad measures of market performance. The Bloomberg Barclays Municipal All Insured Bond Index is a total return performance benchmark for municipal bonds that are backed by insurers with Aaa/AAA ratings and have maturities of at least one year.
All returns assume reinvestment of dividends and distributions. The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Performance reflects fee waivers and/or expense reimbursement in effect, if such waivers or reimbursements were not in place, the Fund’s performance would be reduced. Fund performance current to the most recent month-end is available by calling 1-888-474-7725 or by visiting newyorklifeinvestments.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table provide an indication of the risks of investing in the Fund by comparing the Fund’s performance from year to year and by showing how the Fund’s average annual returns for one calendar year compared with its benchmark and additional broad measures of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-888-474-7725
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress newyorklifeinvestments.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 Closing [Text Block] rr_BarChartClosingTextBlock
The Fund’s year-to-date total returns as of June 30, 2021 was 1.00%.
Best and Worst Quarter Returns (for the period reflected in the bar chart above)
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Return
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Quarter/Year
​
Highest Return ​ ​ ​ ​ 2.96% ​ ​ ​ ​ ​ 1Q/2020 ​ ​
Lowest Return ​ ​ ​ ​ -1.43% ​ ​ ​ ​ ​ 1Q/2018 ​ ​
Year to Date Return, Label rr_YearToDateReturnLabel The Fund’s year-to-date total returns as of June 30, 2021 was
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 1.00%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 2.96%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (1.43%)
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 highest historical 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 your tax situation and may differ from those shown and are not relevant if you hold your Shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In some cases the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund Shares at the end of the measurement period.
Average Annual Return, Caption rr_AverageAnnualReturnCaption Average Annual Total Returns as of December 31, 2020
IQ MacKay Municipal Insured ETF | Bloomberg Barclays Municipal All Insured Bond Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 6.23%
Since Inception rr_AverageAnnualReturnSinceInception 5.42% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 18, 2017
IQ MacKay Municipal Insured ETF | IQ MacKay Municipal Insured ETF  
Risk/Return: rr_RiskReturnAbstract  
Management Fee rr_ManagementFeesOverAssets 0.40%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.11%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.52% [2]
Expense Waiver/Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.21% [3]
Total Annual Fund Operating Expenses After Expense Waiver/Reimbursement rr_NetExpensesOverAssets 0.31%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 32
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 146
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 270
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 632
Annual Return 2018 rr_AnnualReturn2018 1.68%
Annual Return 2019 rr_AnnualReturn2019 8.06%
Annual Return 2020 rr_AnnualReturn2020 7.45%
1 Year rr_AverageAnnualReturnYear01 7.45%
Since Inception rr_AverageAnnualReturnSinceInception 5.80% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 18, 2017
IQ MacKay Municipal Insured ETF | IQ MacKay Municipal Insured ETF | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 7.45% [4]
Since Inception rr_AverageAnnualReturnSinceInception 5.43% [1],[4]
IQ MacKay Municipal Insured ETF | IQ MacKay Municipal Insured ETF | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 5.37% [4]
Since Inception rr_AverageAnnualReturnSinceInception 4.71% [1],[4]
[1] The Fund commenced operations on October 18, 2017.
[2] The Total Annual Fund Operating Expenses may not correlate to the ratio of expenses to average net assets as reported in the “Financial Highlights” section of the Prospectus, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees & Expenses. Acquired Fund Fees & Expenses represent the Fund’s pro rata share of fees and expenses incurred indirectly as a result of investing in other funds, including ETFs and money market funds.
[3] IndexIQ Advisors LLC (the “Advisor”) has contractually agreed to waive or reduce its management fee and/or reimburse expenses of the Fund in an amount that limits “Total Annual Fund Operating Expenses” ​(exclusive of interest, taxes, brokerage fees and commissions, dividends paid on short sales, acquired fund fees and expenses, and extraordinary expenses), to not more than 0.30% of average daily net assets of the Fund. The agreement will remain in effect until August 31, 2022, unless terminated by the Board of Trustees.
[4] After-tax returns are calculated using the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown and are not relevant if you hold your Shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. In some cases the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund Shares at the end of the measurement period.