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Tierra XP Latin America Real Estate ETF  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Tierra XP Latin America Real Estate ETF
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Tierra XP Latin America Real Estate ETF (the “Fund”) seeks to provide investment results that, before fees and expenses, correspond generally to the total return performance of the Solactive Latin America Real Estate Index (the “Index”).
Expense [Heading] rr_ExpenseHeading 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. The fees are expressed as a percentage of the Fund’s average daily net assets. This table and the Example below do not include the brokerage commissions that investors may pay on their purchases and sales of Fund shares.
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 the 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. Because the Fund is newly organized, portfolio turnover information is not yet available.
Expense Exchange Traded Fund Commissions [Text] rr_ExpenseExchangeTradedFundCommissions This table and the Example below do not include the brokerage commissions that investors may pay on their purchases and sales of Fund shares.
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates 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. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then sell 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. This Example does not include the brokerage commissions that investors may pay on their purchases and sales of Fund shares.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your cost would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund uses a “passive” or indexing approach to try to achieve the Fund’s investment objective. Unlike many investment companies, the Fund does not try to “beat” the Index and does not seek temporary defensive positions when markets decline or appear overvalued.

The Index tracks the performance of companies actively involved in the Latin American real estate sector that derive the majority of their revenues from the operation of real estate and real estate services in the Latin America region. The Index consists of exchange-listed common shares and depositary receipts of Latin American companies in four categories:

·  
Listed real estate investment trusts (“REITs”) or the locally-listed regulatory equivalent that distribute substantially all of their income to their shareholders pursuant to local laws. These include Mexican “FIBRAs” and Brazilian “FIIs”, which may be organized as closed-end investment companies (“CEFs”).

·  
Real estate developers engaged in the sale of residential, commercial office, retail, industrial, and hospitality real estate or certain real estate-related infrastructure developments (e.g., industrial parks, planned residential communities, airports) (“Infrastructure Developments”).

·  
Companies that own income producing multifamily, commercial office, retail, industrial, and hospitality real estate or Infrastructure Developments.

·  
Service providers that derive a majority of their revenue from activities directly related to real estate or Infrastructure Developments.

Companies meeting the above criteria are screened for investibility (e.g., must not be listed on an exchange in a country which employs certain restrictions on foreign capital investment), a minimum market capitalization, and liquidity (i.e., average trading volume). The companies in the Index are weighted based on their market capitalization, liquidity, and dividend yield, such that the larger a company’s market capitalization, the greater its liquidity, and the higher its dividend yield, the larger its weighting in the Index. At the time of each reconstitution, no single Index component will represent more than 20% of the weight of the Index, and the cumulative weight of all components with an individual weight of 5% or greater will not in the aggregate account for more than 50% of the weight of the Index. As of September 2, 2015, the three largest positions in the Index were Fundo De Investimento Imobiliario Brazilian Capital Real Estate (3.31%), CSHG Real Estate – Fundo de Investimento Imobiliario – FII (3.26%), and Brasil Brokers Participações S.A. (3.20%).

The Index is owned by Solactive AG (“Solactive”) and calculated and maintained by Solactive. Solactive is responsible for final decisions regarding the composition of the Index as well as any amendments to the Index’s methodology. Although the Index methodology is expected to generally produce the set of Index constituents, Solactive may utilize subjective screening based on fundamental analyses or other factors if it believes that certain companies should be included or excluded from the Index notwithstanding the Index methodology. Solactive is independent of the Fund and its investment adviser, sub-adviser and distributor.

The Index is reconstituted quarterly at the close of business on the first Friday of March, June, September, and December. Whenever possible, changes to the Index are announced on Solactive’s website at least one trading day in advance of the actual change. The Index is not limited to a minimum or maximum number of constituents; rather, it includes all companies meeting the eligibility criteria for inclusion in the Index. The Index may include companies of any market capitalization, including small capitalization companies.

The Fund will use a replication strategy. A replication strategy is an indexing strategy that involves investing in the securities of the Index in approximately the same proportions as in the Index. However, the Fund may utilize a representative sampling strategy with respect to the Index when a replication strategy might be detrimental to shareholders, such as when there are practical difficulties or substantial costs involved in compiling a portfolio of equity securities to follow the Index, in instances in which a security in the Index becomes temporarily illiquid, unavailable or less liquid, or as a result of legal restrictions or limitations (such as tax diversification requirements) that apply to the Fund but not the Index.

The Fund will invest at least 80% of its total assets in the component securities of the Index and in American Depositary Receipts and Global Depositary Receipts representing the component securities in the Index. As a result, under normal circumstances, the Fund will invest at least 80% of its total assets in securities of real estate related companies in Latin America (the “80% Policy”).

Correlation: Correlation is the extent to which the values of different types of investments move in tandem with one another in response to changing economic and market conditions. An index is a theoretical financial calculation, while the Fund is an actual investment portfolio. The performance of the Fund and the Index may vary somewhat due to transaction costs, asset valuations, foreign currency valuations, market impact, corporate actions (such as mergers and spin-offs), legal restrictions or limitations, illiquid or unavailable securities, and timing variances.

The Fund's investment Adviser expects that, over time, the correlation between the Fund’s performance and that of the Index, before fees and expenses, will exceed 95%. A correlation percentage of 100% would indicate perfect correlation. If the Fund uses a replication strategy, it can be expected to have greater correlation to the Index than if it uses a representative sampling strategy.

Industry Concentration Policy: The Fund will concentrate its investments (i.e., hold 25% or more of its net assets) in a particular industry or group of related industries to approximately the same extent that the Index is concentrated.  As of September 2, 2015, the Index was concentrated in real estate related companies.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration The Fund will concentrate its investments ( i.e., hold 25% or more of its net assets) in a particular industry or group of related industries to approximately the same extent that the Index is concentrated. As of September 2, 2015, the Index was concentrated in real estate related companies.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with all funds, a shareholder is subject to the risk that his or her investment could lose money. The principal risks affecting shareholders’ investments in the Fund are set forth below. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the FDIC or any government agency.

Cash Redemption Risk: The Fund’s investment strategy may require it to redeem shares for cash or to otherwise include cash as part of its redemption proceeds. The Fund may be required to sell or unwind portfolio investments to obtain the cash needed to distribute redemption proceeds. This may cause the Fund to recognize a capital gain that it might not have recognized if it had made a redemption in-kind. As a result, the Fund may pay out higher annual capital gain distributions than if the in-kind redemption process was used.

Foreign Investment Risk: Returns on investments in foreign stocks could be more volatile than, or trail the returns on, investments in U.S. stocks.

Capital Controls Risk: Economic conditions, such as volatile currency exchange rates and interest rates, political events and other conditions may, without prior warning, lead to foreign government intervention and the imposition of “capital controls.” Capital controls include the prohibition of, or restrictions on, the ability to transfer currency, securities or other assets. Capital controls may impact the ability of the Fund to buy, sell or otherwise transfer securities or currency, adversely affect the trading market and price for shares of the Fund, and cause the Fund to decline in value.

Currency Risk: Indirect and direct exposure to foreign currencies subjects the Fund to the risk that currencies will decline in value relative to the U.S. dollar. Currency rates in foreign countries may fluctuate significantly over short periods of time for a number of reasons, including changes in interest rates and the imposition of currency controls or other political developments in the U.S. or abroad.

Depositary Receipts Risk. The Fund may invest in depositary receipts. Investment in ADRs and GDRs may be less liquid than the underlying shares in their primary trading market and GDRs, many of which are issued by companies in emerging markets, may be more volatile and less liquid than depositary receipts issued by companies in more developed markets.

Emerging Markets Securities Risk: The Fund’s investments may expose the Fund’s portfolio to the risks of investing in emerging markets. Investments in emerging markets are subject to greater risk of loss than investments in developed markets. This is due to, among other things, greater market volatility, lower trading volume, political and economic instability, greater risk of market shutdown and more governmental limitations on foreign investments than typically found in developed markets.

Foreign Market and Trading Risk. The trading markets for many foreign securities are not as active as U.S. markets and may have less governmental regulation and oversight. Foreign markets also may have clearance and settlement procedures that make it difficult for the Fund to buy and sell securities. These factors could result in a loss to the Fund by causing the Fund to be unable to dispose of an investment or to miss an attractive investment opportunity, or by causing Fund assets to be uninvested for some period of time.

Foreign Securities Risk: The Fund invests a significant portion of its assets directly in securities of issuers based outside of the U.S., or in depositary receipts that represent such securities. Investments in securities of non-U.S. issuers involve certain risks that may not be present with investments in securities of U.S. issuers, such as risk of loss due to foreign currency fluctuations or to political or economic instability. There may be less information publicly available about a non-U.S. issuer than a U.S. issuer. Non-U.S. issuers may also be subject to different accounting, auditing, financial reporting and investor protection standards than U.S. issuers.

Political and Economic Risk. The Fund is subject to foreign political and economic risk not associated with U.S. investments, meaning that political events, social and economic events and natural disasters occurring in a country where the Fund invests could cause the Fund’s investments in that country to experience gains or losses. The Fund also could be unable to enforce its ownership rights or pursue legal remedies in countries where it invests.

Privatization Risk: Several foreign countries in which the Fund invests have begun a process of privatizing certain entities and industries. Privatized entities may lose money or be re-nationalized.

Reliance on Trading Partners Risk: The Fund invests in some economies that are heavily dependent upon trading with key partners. Any reduction in this trading may cause an adverse impact on the economy in which the Fund invests.

Geographic Concentration Risk: The Fund is expected to be concentrated in Latin American companies and particularly companies in Brazil and Mexico. To the extent the Fund is significantly comprised of securities of issuers from a single country or geographic region, the Fund would be more likely to be impacted by events or conditions affecting that country or region.

Investment Company Risk: The risks of investment in investment companies, such as CEFs, typically reflect the risks of the types of instruments in which the investment companies invest. By investing in another investment company, the Fund becomes a shareholder of that investment company and bears its proportionate share of the fees and expenses of the other investment company.

Market Risk: The values of equity securities in the Index could decline generally or could underperform other investments.

Market Trading Risk: An investment in the Fund faces numerous market trading risks, including the potential lack of an active market for Fund shares, losses from trading in secondary markets, periods of high volatility and disruption in the creation/redemption process of the Fund. Any of these factors, among others, may lead to the Fund’s shares trading at a premium or discount to NAV.

Trading Issues. Although Fund shares are listed for trading on the NYSE Arca, Inc. (the “Exchange”),there can be no assurance that an active trading market for such shares will develop or be maintained. Trading in Fund shares may be halted due to market conditions or for reasons that, in the view of the Exchange, make trading in shares inadvisable. There can be no assurance that the requirements of the Exchange necessary to maintain the listing of any Fund will continue to be met or will remain unchanged or that the shares will trade with any volume, or at all.

Fluctuation of NAV. The NAV of Fund shares will generally fluctuate with changes in the market value of the Fund’s securities holdings. The market prices of shares will generally fluctuate in accordance with changes in the Fund’s NAV and supply and demand of shares on the Exchange. It cannot be predicted whether Fund shares will trade below, at or above their NAV. During periods of unusual volatility or market disruptions, market prices of Fund shares may deviate significantly from the market value of the Fund’s securities holdings or the NAV of Fund shares.

Costs of Buying or Selling Shares. Investors buying or selling Fund shares in the secondary market will pay brokerage commissions or other charges imposed by brokers as determined by that broker. Brokerage commissions are often a fixed amount and may be a significant proportional cost for investors seeking to buy or sell relatively small amounts of shares.

New Fund Risk. There can be no assurance that the Fund will grow to or maintain an economically viable size.

Non-Diversification Risk: The Fund is non-diversified, meaning that, as compared to a diversified fund, it can invest a greater percentage of its assets in securities issued by or representing a single or a small number of issuers. As a result, the performance of these issuers can have a substantial impact on the Fund’s performance.

Passive Investment Risk: The Fund is not actively managed and therefore would not sell an equity security due to current or projected underperformance of a security, industry or sector, unless that security is removed from the Index.

Real Estate Securities and REIT Risk: The Fund invests in companies in the real estate industry, including REITs and locally-listed regulatory equivalents that distribute substantially all of their income to their shareholders pursuant to local laws. Therefore, the Fund is subject to the risks associated with investing in real estate, which may include possible declines in the value of real estate, increased competition and other risks related to national, state or local real estate conditions, obsolescence of properties, changes in the availability, cost and terms of mortgage funds (including changes in interest rates), the impact of changes in environmental laws and possible environmental liabilities, overbuilding in a real estate company’s market, increases in operating costs and property taxes, changes in zoning laws, casualty or condemnation losses, regulatory limitations on rent and fluctuations in rental income.

In addition, the U.S. federal or other jurisdiction’s tax requirement that a REIT or its local equivalent distribute substantially all of its net income to its shareholders may result in such company having insufficient capital for future expenditures. The failure of a company to qualify as a REIT could have adverse consequences for the Fund, including significantly reducing return to the Fund on its investment in any such company.

Risks Related to Investing in Latin America: Many economies in Latin America have experienced high interest rates, economic volatility, inflation, currency devaluations and high unemployment rates. Any adverse economic event in one country can have a significant effect on other countries of this region. 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.

Risks Related to Investing in Brazil: Investments in securities of Brazilian companies are subject to regulatory and economic interventions that the Brazilian government has frequently exercised in the past, including the setting of wage and price controls, blocking access to bank accounts, imposing exchange controls and limiting imports. Investments are also subject to certain restrictions on foreign investment as provided by Brazilian law. The Brazilian economy has historically been subject to high rates of inflation and a high level of debt, all of which may stifle economic growth. Despite rapid development in recent years, Brazil still suffers from high levels of corruption, crime and income disparity. There is the possibility that such conditions may lead to social unrest and political upheaval in the future, which may have adverse effects on the Fund's investments.

Risks Related to Investing in Mexico: Investment exposure to Mexican issuers involves risks that are specific to Mexico, including regulatory, political, and economic risks. The Mexican economy, among other things, is dependent upon external trade with other economies, specifically with the United States. As a result, Mexico is dependent on, among other things, the U.S. economy and any change in the price or demand for Mexican exports may have an adverse impact on the Mexican economy. Recently, Mexico has experienced an outbreak of violence related to drug trafficking. Incidents involving Mexico’s security may have an adverse effect on the Mexican economy and cause uncertainty in its financial markets. In the past, Mexico has experienced high interest rates, economic volatility and high unemployment rates.

Mexico has been destabilized by local insurrections, social upheavals, drug related violence, and the public health crisis related to the H1N1 influenza outbreak. Recurrence of these or similar conditions may adversely impact the Mexican economy. Recently, Mexican elections have been contentious and have been very closely decided. Changes in political parties or other Mexican political events may affect the economy and cause instability.

Smaller Companies Risk: Smaller companies in which the Fund may invest may be more vulnerable to adverse business or economic events than larger, more established companies, and may underperform other segments of the market or the equity market as a whole.

Tax Risk: To qualify for the favorable tax treatment generally available to regulated investment companies, the Fund must satisfy certain diversification requirements under the Internal Revenue Code of 1986, as amended (the “Code”). In particular, the Fund generally may not acquire a security if, as a result of the acquisition, more than 50% of the value of the Fund’s assets would be invested in (a) issuers in which the Fund has, in each case, invested more than 5% of the Fund’s assets and (b) issuers more than 10% of whose outstanding voting securities are owned by the Fund. When the Index is concentrated in a relatively small number of securities, it may not be possible for the Fund to fully implement a replication strategy or a representative sampling strategy while satisfying these diversification requirements. The Fund’s efforts to satisfy the diversification requirements may cause the Fund’s return to deviate from that of the Index, and the Fund’s efforts to replicate the Index may cause it inadvertently to fail to satisfy the diversification requirements. If the Fund were to fail to qualify as a regulated investment company, it would be taxed in the same manner as an ordinary corporation, and distributions to its shareholders would not be deductible by the Fund in computing its taxable income.

Tracking Error Risk: The Fund’s return may not match or achieve a high degree of correlation with the return of the Index. To the extent the Fund utilizes a sampling approach, it may experience tracking error to a greater extent than if the Fund sought to replicate the Index.

Valuation Risk: The sales price that the Fund could receive for a security may differ from the Fund’s valuation of the security and may differ from the value used by the Index, particularly for securities that trade in low volume or volatile markets or that are valued using a fair value methodology. In addition, the value of the securities in the Fund’s portfolio may change on days when shareholders will not be able to purchase or sell the Fund’s shares.
Risk Lose Money [Text] rr_RiskLoseMoney As with all funds, a shareholder is subject to the risk that his or her investment could lose money.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus The Fund is non-diversified, meaning that, as compared to a diversified fund, it can invest a greater percentage of its assets in securities issued by or representing a single or a small number of issuers. As a result, the performance of these issuers can have a substantial impact on the Fund’s performance.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Fund is not a bank deposit and is not insured or guaranteed by the FDIC or any government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The Fund is new and therefore does not have performance history for a full calendar year. Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund's returns and comparing the Fund's performance to a broad measure of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund's returns and comparing the Fund's performance to a broad measure of market performance.
Tierra XP Latin America Real Estate ETF | Tierra XP Latin America Real Estate ETF  
Risk/Return: rr_RiskReturnAbstract  
Management Fee rr_ManagementFeesOverAssets 0.79%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets none [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.79%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 81
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 252
[1] Based on estimated amounts for the current fiscal year.