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IQ Fastest Growing Companies ETF  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

IQ Fastest Growing Companies ETF
Objective [Heading] rr_ObjectiveHeading

Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Fund seeks investment results that correspond (before fees and expenses) generally to the price and yield performance of its underlying index, the IQ Fastest Growing Companies Index (the “Underlying Index”).
Expense [Heading] rr_ExpenseHeading

Fees and Expenses of the Fund
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 (“Shares”). Investors purchasing Shares on a national securities exchange, national securities association or over-the-counter trading system where Shares may trade from time to time (each, a “Secondary Market”) may be subject to customary brokerage commissions charged by their broker that are not reflected in the table set forth below.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment):

 

No shareholder fees are levied by the Fund for purchases and sales made on the Secondary Market.
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):
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. This rate excludes the value of portfolio securities received or delivered as a result of in-kind creations or redemptions of the Fund’s Shares. As of the date of this Prospectus, the Fund had not yet commenced operations.
Expense Exchange Traded Fund Commissions [Text] rr_ExpenseExchangeTradedFundCommissions

Investors purchasing Shares on a national securities exchange, national securities association or over-the-counter trading system where Shares may trade from time to time (each, a “Secondary Market”) may be subject to customary brokerage commissions charged by their broker that are not reflected in the table set forth below.
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates

The Fund has not yet commenced operations and Other Expenses are based on estimated amounts for the 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 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 employs a “passive management” — or indexing — investment approach designed to track the performance of the Underlying Index, which was developed by IndexIQ LLC (“IndexIQ”), an affiliate of IndexIQ Advisors LLC, the Fund’s investment advisor (the “Advisor”). The Underlying Index is a rules-based, index intended to give investors exposure to high growth United States (“U.S.”) companies, as measured by several growth factors.

 

Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in the components that make up its Underlying Index (the “Underlying Index Components”).

 

After establishing the eligible universe of companies, the Underlying Index selects for inclusion and weights the top 50 eligible issuers based on the following growth-related factors:

 

•   Sales growth;

 

•   Net income growth;

 

•   Cash flow growth; and

 

•   Total return

 

The factors above were chosen to isolate companies that have historically demonstrated an ability to generate high levels of shareholder value by consistently achieving significant growth rates across multiple financial factors.

 

The Underlying Index Components that are eligible for inclusion in the Underlying Index include the following characteristics, measured as of each annual rebalance date:

 

•   Issuer must be domiciled in the U.S.;

 

•   Issuer’s shares must have their primary stock exchange listing in the U.S.;

 

•   Issuer must be ranked within the top 500 U.S. public companies by sales;

 

•   Issuer must have a minimum average market capitalization of $1.5 billion for the 60 days prior to and as of the annual rebalance date;

 

•   Issuer’s shares must have minimum average daily trading volume of at least $1 million for the prior 90 days; and

 

•   Issuer’s shares must have minimum monthly volume of 250,000 shares each month over the prior six months.

 

Securities of issuers with recent stock exchange listings (i.e., recent initial public offerings) that meet all of the eligibility criteria may be added to the Underlying Index on an annual basis, provided that the companies’ securities have been trading for at least six months.

 

The Underlying Index Components are selected annually in connection with the reconstitution of the Underlying Index. Their respective weights are rebalanced annually in connection with the rebalance of the Underlying Index.

 

As of June 30, 2016, the market capitalizations of the Underlying Index Components ranged from approximately $1.5 billion to approximately $400 billion.

 

For additional information about the Fund’s principal investment strategies, see “Description of the Principal Investment Strategies of the Funds.”
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration

Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in the components that make up its Underlying Index (the “Underlying Index Components”).
Risk [Heading] rr_RiskHeading

Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

Investors in the Fund should be willing to accept a high degree of volatility in the price of the Fund’s Shares and the possibility of significant losses. An investment in the Fund involves a substantial degree of risk and the Fund does not represent a complete investment program. As with all investments, you may lose money in the Fund. An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Therefore, you should consider carefully the following risks before investing in the Fund. A more complete discussion of Principal Risks is included under “Description of the Principal Risks of the Funds.”

 

Concentration Risk

 

To the extent that the Fund’s investments are concentrated in a particular country, market, industry or asset class, the Fund will be susceptible to loss due to adverse occurrences affecting that country, market, industry or asset class.

 

Equity Securities Risk

 

Equity securities are subject to changes in value and their values may be more volatile than other asset classes.

 

Growth Securities Risk

 

The Fund invests in securities of high growth companies, which may be more volatile than other types of investments.

 

Index Risk

 

The Underlying Index may not be successful in replicating the performance of its target strategies.

 

Management Risk

 

The strategy used by the Advisor to match the performance of the Underlying Index may fail to produce the intended results.

 

Market Risk

 

The market price of investments owned by the Fund may go up or down, sometimes rapidly or unpredictably.

 

Mid Capitalization Companies Risk

 

The Fund invests in the securities of mid capitalization companies, the value of which may be more volatile than those of larger companies.

 

New Fund Risk

 

The Fund is a new fund. As a new fund, there can be no assurance that it will grow to or maintain an economically viable size, in which case it may experience greater tracking error to its Underlying Index than it otherwise would at higher asset levels or it could ultimately liquidate.

 

Replication Management Risk

 

Unlike many investment companies, the Fund seeks to track its Underlying Index and is not “actively” managed. Therefore, it would not necessarily sell a security because the security’s issuer was in financial trouble unless that security is removed from (or was no longer useful in tracking a component of) the Underlying Index.

 

Small Capitalization

 

Companies Risk

 

The Fund invests in the securities of small capitalization companies, the value of which may be more volatile than those of larger companies.

 

Tracking Error Risk

 

Although the Fund attempts to track the performance of its Underlying Index, the Fund may not be able to duplicate its exact composition or return for any number of reasons.

 

Trading Price Risk

 

Although it is expected that generally the market price of the Shares will approximate the Fund’s NAV, there may be times when the market price in the Secondary Market and the NAV vary significantly.
Risk Lose Money [Text] rr_RiskLoseMoney

Investors in the Fund should be willing to accept a high degree of volatility in the price of the Fund’s Shares and the possibility of significant losses.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading

Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

As of the date of this Prospectus, the Fund has not yet commenced operations and therefore does not report its performance information.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess

As of the date of this Prospectus, the Fund has not yet commenced operations and therefore does not report its performance information.
IQ Fastest Growing Companies ETF | IQ Fastest Growing Companies ETF  
Risk/Return: rr_RiskReturnAbstract  
Management Fee rr_ManagementFeesOverAssets 0.49%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.01% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.50%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 51
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 160
[1] The Fund has not yet commenced operations and Other Expenses are based on estimated amounts for the current fiscal year.