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Class A & Y Prospectus | PACE® Alternative Strategies Investments  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading PACE® Alternative Strategies Investments
Objective [Heading] rr_ObjectiveHeading Investment objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and expenses of the fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

These tables describe the fees and expenses that you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts on purchases of Class A shares if you or your family invest, or agree to invest in the future, at least $50,000 in the UBS family of funds. More information about these and other discounts and waivers, as well as eligibility requirements for each share class, is available from your financial advisor and in "Managing your fund account" on page 121 of the prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 219 of the fund's Statement of Additional Information. Different intermediaries and financial professionals may make available different sales charge waivers or discounts. These variations are described in Appendix A beginning on page A-1 of this prospectus (Intermediary-Specific Sales Charge Waivers and Discounts).
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 Nov. 30, 2019
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 346% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 346.00%
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates "Dividend expense, borrowing costs and related interest expense attributable to securities sold short" are based on estimated amounts for the current fiscal year.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees These "Acquired fund fees and expenses" are based on estimated amounts for the current fiscal year. Since the "Acquired fund fees and expenses" are not directly borne by the fund, they are not reflected in the fund's financial statements, and therefore the amounts listed in "Total annual fund operating expenses" and "Total annual fund operating expenses after fee waiver and/or expense reimbursements" may differ from those presented in the financial highlights.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods unless otherwise stated. The example also assumes that your investment has a 5% return each year and that the fund's operating expenses remain the same.*


Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Principal investments


The fund has a broad investment mandate that permits it to use an extensive range of investment strategies and to invest in a wide spectrum of equity, fixed income and derivative securities in pursuing its investment objective. The fund seeks to provide investors a well diversified portfolio intended to provide participation in growing markets over a full market cycle while limiting large losses in more volatile and declining markets. The fund may pursue its investment objective by implementing a broad and diversified array of liquid alternative strategies, including strategies that are not currently employed by the fund.


The fund invests in equity securities of US and non-US companies of various market capitalizations. The fund also invests in fixed income securities, which are not subject to any credit rating or maturity limitations, issued by companies and government and supranational entities around the world. The fund may invest in emerging as well as developed markets and may invest a significant portion of its assets in the securities of companies in particular economic sectors. The fund may also invest in the securities of other investment companies, including exchange-traded funds ("ETFs").


The fund may, but is not required to, invest extensively in exchange-traded or over-the-counter derivative instruments for risk management purposes or to attempt to increase total returns. The derivatives in which the fund may invest include options, futures, currency forward and futures agreements and swap agreements (specifically, interest rate swaps and swaps on futures or indices). These derivatives may be used for risk management purposes, such as hedging the fund's security, index, currency, interest rate or other exposure, or otherwise managing the risk profile of the fund. In addition, the derivative instruments listed above may be used to enhance returns; in place of direct investments; to obtain or adjust exposure to certain markets; or to establish net short positions in markets, currencies or securities. Futures on indices and interest rate swaps may also be used to adjust the fund's portfolio duration, or to achieve a negative portfolio duration.


The fund is also permitted to engage in "short-selling." When selling short, the fund will sell a security it does not own at the then-current market price and then borrow the security to deliver to the buyer. The fund is then obligated to buy the security on a later date so that it can return the security to the lender. Short selling provides opportunities to increase the fund's total returns, but also entails significant potential risks.


The fund's investment strategies may result in high portfolio turnover.


Management process


The fund employs a "manager of managers" structure. UBS Asset Management (Americas) Inc. ("UBS AM"), the fund's manager and primary provider of investment advisory services, currently serves as one of the fund's subadvisors (i.e., it allocates a portion of the fund's assets to other unaffiliated pooled investment vehicles and index futures) and has the ultimate authority, subject to oversight by the fund's board, to oversee the fund's other subadvisor(s) and recommend their hiring, termination and replacement, and to allocate assets among the fund's subadvisor(s). The allocation of the fund's assets between subadvisors is designed to achieve long-term capital appreciation while having a low correlation to traditional equity and fixed income asset classes. Subject to approval by the fund's board of trustees, UBS AM may in the future allocate assets to additional or different subadvisors to employ other portfolio management strategies, and changes to current strategies may be made.


UBS AM's investment process begins with subadvisor selection. UBS AM's portfolio management team constructs a list of potential subadvisors based on information primarily from internal sources and the team's collective knowledge of the industry, but also supplemented by external sources. The team then focuses its research on that list to identify a small number of the most attractive candidates. This research includes analyzing the portfolio holdings and/or positioning of a subadvisor's investment strategy to under-stand whether the allocation of risk and the drivers of alpha are consistent with the subadvisor's investment philosophy and stated strengths. The most attractive sub-set of those subadvisors is then selected for in-depth, on-site due diligence meetings with representatives from the investment, operations and compliance groups within UBS AM. The due diligence information is then synthesized to select the most attractive candidate(s) for the fund, subject to the board's approval.


In managing the fund and overseeing the fund's subadvisor(s), UBS AM views its research process as an ongoing one, as the team continually seeks to confirm a subadvisor's investment thesis over the appropriate investment horizon. In general, UBS AM leverages its research and market knowledge to construct funds with exposure to various subadvisors that are expected, in combination, to produce the desired overall fund characteristics. UBS AM's ongoing monitoring and risk management process incorporates daily, weekly, monthly, quarterly and annual responsibilities designed to monitor the drivers of fund risk and performance at the subadvisor level and at the overall fund level. Through this process, UBS AM may adjust a fund's positioning by altering its allocation weights across subadvisors within the fund and/or by changing the specific subadvisors within the fund.


The main strategies of the subadvisors include:


•  An "opportunistic strategy" in which UBS AM allocates a portion of the fund's assets primarily to unaffiliated actively- and passively-managed pooled investment vehicles that UBS AM believes are suitable for return generation, risk management or both.


•  A "long/short global equity" strategy in which the subadvisor buys securities "long" that the subadvisor believes will out-perform the market, and sells securities "short" that the subadvisor believes will underperform the market.


•  A "currency strategy" that seeks to produce absolute return from investing in currency markets.


•  A "global multi-asset strategy" that involves achieving a total return by delivering a diversified global portfolio that makes use of multiple strategies across various asset classes.


•  A "liquid alternative long/short equity strategy" in which the subadvisor generally utilizes long positions that the subadvisor believes are attractively-valued, growth-oriented companies of mid to large capitalization and short positions that the subadvisor believes have deteriorating fundamentals or appear overvalued.


•  A "global unconstrained multi-strategy" strategy that identifies and pursues diverse strategies across asset classes, sectors, currencies, interest rates, inflation and volatility that are expected to work well together whether markets are rising or falling.


•  An "absolute return equity market neutral" strategy that aims to earn a positive absolute and attractive risk-adjusted return while demonstrating low correlation with, and lower volatility than, traditional long-only investment portfolios.


•  A "long/short US, small cap equity" strategy in which the subadvisor primarily buys securities of US small capitalization companies "long" that the subadvisor believes will out-perform the market, and sells securities of US small capitalization companies "short" that the subadvisor believes will underperform the market.
Risk [Heading] rr_RiskHeading Principal risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

All investments carry a certain amount of risk and the fund cannot guarantee that it will achieve its investment objective. You may lose money by investing in the fund. An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The principal risks presented by an investment in the fund are:


Aggressive investment risk: The fund may employ investment strategies that involve greater risks than the strategies used by typical mutual funds, including increased use of short sales (which involve the risk of an unlimited increase in the market value of the security sold short, which could result in a theoretically unlimited loss), leverage and derivative transactions, and hedging strategies.


Arbitrage trading risk: The underlying relationships between securities in which the fund takes arbitrage investment positions may change in an adverse manner, causing the fund to realize losses.


Credit risk: The risk that the fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to or guarantor of a derivative contract, is unable or unwilling to meet its financial obligations. This risk is likely greater for lower quality investments than for investments that are higher quality.


Derivatives risk: The value of derivatives—so called because their value derives from the value of an underlying asset, reference rate or index—may rise or fall more rapidly than other investments. It is possible for the fund to lose more than the amount it invested in the derivative. When using derivatives for hedging purposes, the fund's overall returns may be reduced if the hedged investment experiences a favorable price movement. In addition, if the fund has insufficient cash to meet daily variation margin or payment requirements, it may have to sell securities from its portfolio at a time when it may be disadvantageous to do so. The risks of investing in derivative instruments also include market and management risks. Derivatives relating to fixed income markets are especially susceptible to interest rate risk and credit risk. In addition, many types of swaps and other derivatives may be subject to liquidity risk, counterparty risk, credit risk and mispricing or valuation complexity. Derivatives also involve the risk that changes in the value of a derivative may not correlate as anticipated with the underlying asset, rate, index or overall securities markets, thereby reducing their effectiveness. These derivatives risks are different from, and may be greater than, the risks associated with investing directly in securities and other instruments.


Equity risk: Stocks and other equity securities, and securities convertible into stocks, generally fluctuate in value more than bonds. The fund could lose all of its investment in a company's stock.


Foreign currency risk: The value of non-US dollar denominated securities held by the fund may be affected by changes in exchange rates or control regulations. If a local currency declines against the US dollar, the value of the holding decreases in US dollar terms. In addition, the fund may be exposed to losses if its other foreign currency positions (e.g., options, forward commitments) move against it.


Foreign investing risk: The value of the fund's investments in foreign securities may fall due to adverse political, social and economic developments abroad and due to decreases in foreign currency values relative to the US dollar. Investments in foreign government bonds involve special risks because the fund may have limited legal recourse in the event of default. Also, foreign securities are sometimes less liquid and more difficult to sell and to value than securities of US issuers. These risks are greater for investments in emerging market issuers. In addition, investments in emerging market issuers may decline in value because of unfavorable foreign government actions, greater risks of political instability or the absence of accurate information about emerging market issuers.


High yield securities ("junk bonds") risk: Lower-rated securities (the issuers of which are typically in poorer financial health) are subject to higher risks than investment grade securities. For example, lower-rated securities may be (1) subject to a greater risk of loss of principal and non-payment of interest (including default by the issuer); (2) subject to greater price volatility; and (3) less liquid than investment grade securities. The prices of such securities may be more vulnerable to bad economic news, or even the expectation of bad news, than higher rated fixed income securities.


Interest rate risk: An increase in prevailing interest rates typically causes the value of fixed income securities to fall. Changes in interest rates will likely affect the value of longer-duration fixed income securities more than shorter-duration securities and higher quality securities more than lower quality securities. When interest rates are falling, some fixed income securities provide that the issuer may repay them earlier than the maturity date, and if this occurs the fund may have to reinvest these repayments at lower interest rates. The risks associated with rising interest rates may be more pronounced going forward due to the end of an extended period of historically low rates.


Investment company risk: Investments in open- or closed-end investment companies, including exchange-traded funds, involve certain risks. The shares of other investment companies are subject to the management fees and other expenses of those companies, and the purchase of shares of some investment companies requires the payment of sales loads and (in the case of closed-end investment companies) sometimes substantial premiums above the value of such companies' portfolio securities.


Leverage risk associated with financial instruments: The use of financial instruments to increase potential returns, including derivatives used for investment (non-hedging) purposes, may cause the fund to be more volatile than if it had not been leveraged. The use of leverage may also accelerate the velocity of losses and can result in losses to the fund that exceed the amount originally invested.


Limited capitalization risk: The risk that securities of smaller capitalization companies tend to be more volatile and less liquid than securities of larger capitalization companies. This can have a disproportionate effect on the market price of smaller capitalization companies and affect the fund's ability to purchase or sell these securities. In general, smaller capitalization companies are more vulnerable than larger companies to adverse business or economic developments and they may have more limited resources.


Liquidity risk: The risk that investments cannot be readily sold at the desired time or price, and the fund may have to accept a lower price or may not be able to sell the security at all. An inability to sell securities can adversely affect the fund's value or prevent the fund from taking advantage of other investment opportunities. Liquid portfolio investments may become illiquid or less liquid after purchase by the fund due to low trading volume, adverse investor perceptions and/or other market developments. In recent years, the number and capacity of dealers that make markets in fixed income securities has decreased. Consequently, the decline in dealers engaging in market making trading activities may increase liquidity risk, which can be more pronounced in periods of market turmoil. Liquidity risk may be magnified in a rising interest rate environment or when investor redemptions from fixed income funds may be higher than normal, causing increased supply in the market due to selling activity. Liquidity risk includes the risk that the fund will experience significant net redemptions at a time when it cannot find willing buyers for its portfolio securities or can only sell its portfolio securities at a material loss.


Management risk: The risk that the investment strategies, techniques and risk analyses employed by UBS AM and/or a subadvisor may not produce the desired results.


Market risk: The risk that the market value of the fund's investments may fluctuate, sometimes rapidly or unpredictably, as the stock and bond markets fluctuate. Market risk may affect a single issuer, industry, or sector of the economy, or it may affect the market as a whole. Moreover, changing market, economic and political conditions in one country or geographic region could adversely impact market, economic and political conditions in other countries or regions.


Model and data risk: A subadvisor for the fund may employ a complex strategy using proprietary quantitative models in selecting investments for the fund. Investments selected using these models may perform differently than expected as a result of the factors used in the models, the weight placed on each factor, changes from the factors' historical trends, and technical issues in the construction and implementation of the models (including, for example, data problems, problems with data supplied by third parties, software issues, or other types of errors). There is no guarantee that a subadvisor's quantitative models will perform as expected or result in effective investment decisions for the fund.


Multi-manager risk: The investment styles and strategies of the fund's subadvisors may not complement each other as expected by the fund's manager. The same security may be held by different subadvisors, or may be acquired by one subadvisor while another subadvisor of the fund decides to sell the same security. Subadvisors may have different views on the market causing them to make different investment decisions. For example, a subadvisor may determine that it is appropriate to take a temporary defensive position in short-term cash instruments at a time when another subadvisor deems it appropriate to maintain or increase market exposure. Because each subadvisor independently places trades for the fund, the fund may incur higher brokerage costs than would be the case if the fund only had one subadvisor. In addition, UBS AM may be subject to potential conflicts of interests in allocating fund assets because it pays different fees to the subadvisors which could impact its revenues.


Portfolio turnover risk: The fund may engage in frequent trading, which can result in high portfolio turnover. A high portfolio turnover rate involves greater expenses to the fund, including transaction costs, and is likely to generate more taxable short-term gains for shareholders, which may have an adverse impact on performance.


Sector risk: Because the fund may invest a significant portion of its assets in the stocks of companies in particular economic sectors, economic changes adversely affecting such a sector may have more of an impact on the fund's performance than another fund having a broader range of investments.


Short sales risk: There are certain unique risks associated with the use of short sales strategies. When selling a security short, an investment advisor will sell a security it does not own at the then-current market price and then borrow the security to deliver to the buyer. The fund is then obligated to buy the security on a later date so it can return the security to the lender. Short sales therefore involve the risk that the fund will incur a loss by subsequently buying a security at a higher price than the price at which the fund previously sold the security short. This would occur if the securities lender required the fund to deliver the securities the fund had borrowed at the commencement of the short sale and the fund was unable to either purchase the security at a favorable price or to borrow the security from another securities lender. If this occurs at a time when other short sellers of the security also want to close out their positions, a "short squeeze" can occur. A short squeeze occurs when demand is greater than supply for the security sold short. Moreover, because a fund's loss on a short sale arises from increases in the value of the security sold short, such loss, like the price of the security sold short, is theoretically unlimited. By contrast, a fund's loss on a long position arises from decreases in the value of the security and therefore is limited by the fact that a security's value cannot drop below zero. The risks associated with short sales increase when the fund invests the proceeds received upon the initial sale of the security because the fund can suffer losses on both the short position and the long position established with the short sale proceeds. It is possible that the fund's securities held long will decline in value at the same time that the value of the securities sold short increases, thereby increasing the potential for loss.


Structured security risk: The fund may purchase securities representing interests in underlying assets, but structured to provide certain advantages not inherent in those assets (e.g., enhanced liquidity and yields linked to short-term interest rates). If those securities behaved in a way that the fund's investment advisors did not anticipate, or if the security structures encountered unexpected difficulties, the fund could suffer a loss.


Swap agreement risk: The fund may enter into various types of swap agreements. Swap agreements can be less liquid and more difficult to value than other investments. Because its cash flows are based in part on changes in the value of the reference asset, a swap's market value will vary with changes in that reference asset. In addition, the fund may experience delays in payment or loss of income if the counterparty fails to perform under the contract. Central clearing, required margin for uncleared swaps and other requirements are expected to decrease counterparty risk and increase liquidity compared to over-the-counter swaps. However, these requirements do not eliminate counterparty risk or illiquidity risk entirely.


US government securities risk: There are different types of US government securities with different levels of credit risk, including the risk of default, depending on the nature of the particular government support for that security. For example, a US government-sponsored entity, such as Federal National Mortgage Association ("Fannie Mae") or Federal Home Loan Mortgage Corporation ("Freddie Mac"), although chartered or sponsored by an Act of Congress, may issue securities that are neither insured nor guaranteed by the US Treasury and are therefore riskier than those that are.


Valuation risk: During periods of reduced market liquidity or in the absence of readily available market quotations for securities, the ability of the fund to value the fund's securities becomes more difficult and the judgment of the fund's manager and subadvisors may play a greater role in the valuation of the securities due to reduced availability of reliable objective pricing data.
Risk Lose Money [Text] rr_RiskLoseMoney You may lose money by investing in the fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not a deposit of a bank and 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
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

Risk/return bar chart and table


The performance information that follows shows the fund's performance information in a bar chart and an average annual total returns table. The bar chart does not reflect the sales charges of the fund's Class A shares; if it did, the total returns shown would be lower. The information provides 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. The Bloomberg Barclays Global Aggregate Index shows how the fund's performance compares to the broad global markets for US and non-US corporate, government, governmental agency, supranational, mortgage-backed and asset-backed fixed income securities. The MSCI World Index (net) shows how the fund is performing against a diversified global equity index (an asset class in which the fund invests). The HFRI Fund of Funds Composite Index shows how the fund is performing against a broad measure of hedge fund returns. Life of class performance for the indices is as of the inception month-end of each class. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. A predecessor entity of Wells Capital Management Incorporated ("WellsCap") assumed day-to-day management of a separate portion of the funds assets at the inception of the fund. First Quadrant L.P. ("First Quadrant") assumed day-to-day management of a separate portion of the fund's assets on April 8, 2009. Standard Life Investments (Corporate Funds) Limited ("Aberdeen Standard Investments") assumed day-to-day management of a separate portion of the fund's assets on August 5, 2010. UBS AM assumed day-to-day management of a separate portion of the fund's assets (i.e., investing in other unaffiliated pooled investment vehicles and index futures) on March 31, 2014. Sirios Capital Management, L.P. ("Sirios") assumed day-to-day management of a separate portion of the fund's assets on May 20, 2015. Aviva Investors Americas LLC ("Aviva") assumed day-to-day management of a separate portion of the fund's assets on May 9, 2016. PCJ Investment Counsel Ltd. ("PCJ") assumed day-to day management of a separate portion of the fund's assets on July 8, 2016. Kettle Hill Capital Management, LLC ("Kettle Hill") assumed day-to-day management of a separate portion of the fund's assets on September 6, 2017. Updated performance for the fund is available at www.ubs.com/us-mutualfundperformance.


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. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. In addition, the after-tax returns shown are not relevant to investors who hold fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns for other classes will vary from the Class A shares' after-tax returns shown.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The information provides 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.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Bloomberg Barclays Global Aggregate Index shows how the fund's performance compares to the broad global markets for US and non-US corporate, government, governmental agency, supranational, mortgage-backed and asset-backed fixed income securities. The MSCI World Index (net) shows how the fund is performing against a diversified global equity index (an asset class in which the fund invests). The HFRI Fund of Funds Composite Index shows how the fund is performing against a broad measure of hedge fund returns.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.ubs.com/us-mutualfundperformance
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 PACE Alternative Strategies Investments Annual Total Returns of Class A Shares*
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The bar chart does not reflect the sales charges of the fund's Class A shares; if it did, the total returns shown would be lower.
Bar Chart Footnotes [Text Block] rr_BarChartFootnotesTextBlock

*  The returns shown above are for Class A. Previously, the returns were shown for Class C, a class of shares the fund ceased offering on July 12, 2018 and that is no longer offered through this prospectus. Class A has substantially similar annual returns to Class C because Class A is invested in the same portfolio of securities Class C was previously invested in. Class A's returns may differ from Class C's returns to the extent that Class A does not have the same expenses Class C had previously.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Total return January 1 - September 30, 2018: (0.73)%
Best quarter during calendar years shown—2Q 2009: 7.55%
Worst quarter during calendar years shown—3Q 2008: (11.98)%
Year to Date Return, Label rr_YearToDateReturnLabel Total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2018
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (0.73%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter during calendar years shown
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 7.55%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter during calendar years shown
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (11.98%)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (Index 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 Actual after-tax returns depend on an investor's tax situation and may differ from those shown. In addition, the after-tax returns shown are not relevant to investors who hold fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns for other classes will vary from the Class A shares' after-tax returns shown.
Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text] rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod The returns shown above are for Class A. Previously, the returns were shown for Class C, a class of shares the fund ceased offering on July 12, 2018 and that is no longer offered through this prospectus. Class A has substantially similar annual returns to Class C because Class A is invested in the same portfolio of securities Class C was previously invested in. Class A's returns may differ from Class C's returns to the extent that Class A does not have the same expenses Class C had previously.
Caption rr_AverageAnnualReturnCaption Average annual total returns (figures reflect sales charges) (for the periods ended December 31, 2017)
Class A & Y Prospectus | PACE® Alternative Strategies Investments | FTSE Three-Month US Treasury Bill Index (Index reflects no deduction for fees, expenses or taxes.)  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.84% [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.24% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.34% [1]
Class A & Y Prospectus | PACE® Alternative Strategies Investments | Bloomberg Barclays Global Aggregate Index (Index reflects no deduction for fees, expenses or taxes.)  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 7.39% [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.79% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.09% [1]
Class A & Y Prospectus | PACE® Alternative Strategies Investments | MSCI World Index (net) (Index reflects no deduction for fees and expenses.)  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 22.40% [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 11.64% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.03% [1]
Class A & Y Prospectus | PACE® Alternative Strategies Investments | HFRI Fund of Funds Composite Index (Index reflects no deduction for fees, expenses or taxes.)  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 7.77% [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.00% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.08% [1]
Class A & Y Prospectus | PACE® Alternative Strategies Investments | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum front-end sales charge (load) imposed on purchases (as a % of the offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum deferred sales charge (load) (as a % of the lesser of the offering price or the redemption price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Exchange fee rr_ExchangeFee none
Management fees rr_ManagementFeesOverAssets 1.29%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Miscellaneous expenses (includes administration fee of 0.10%) rr_Component1OtherExpensesOverAssets 0.31%
Dividend expense, borrowing costs and related interest expense attributable to securities sold short rr_Component2OtherExpensesOverAssets 0.51% [2]
Other expenses rr_OtherExpensesOverAssets 0.82%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.14% [3]
Total annual fund operating expenses rr_ExpensesOverAssets 2.50%
Management fee waiver/expense reimbursements rr_FeeWaiverOrReimbursementOverAssets 0.09% [4]
Total annual fund operating expenses after fee waiver and/or expense reimbursements rr_NetExpensesOverAssets 2.41% [4]
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts on purchases of Class A shares if you or your family invest, or agree to invest in the future, at least $50,000 in the UBS family of funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 781 [5]
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,278 [5]
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,800 [5]
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 3,224 [5]
Annual Return 2008 rr_AnnualReturn2008 (24.27%)
Annual Return 2009 rr_AnnualReturn2009 11.39%
Annual Return 2010 rr_AnnualReturn2010 3.69%
Annual Return 2011 rr_AnnualReturn2011 (4.15%)
Annual Return 2012 rr_AnnualReturn2012 8.11%
Annual Return 2013 rr_AnnualReturn2013 9.46%
Annual Return 2014 rr_AnnualReturn2014 3.26%
Annual Return 2015 rr_AnnualReturn2015 0.81%
Annual Return 2016 rr_AnnualReturn2016 (0.94%)
Annual Return 2017 rr_AnnualReturn2017 3.71%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (1.98%) [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.05% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.03% [1]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Apr. 10, 2006
Class A & Y Prospectus | PACE® Alternative Strategies Investments | Class A | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (1.98%) [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.73% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 (0.19%) [1]
Class A & Y Prospectus | PACE® Alternative Strategies Investments | Class A | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (1.12%) [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.44% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 (0.05%) [1]
Class A & Y Prospectus | PACE® Alternative Strategies Investments | Class Y  
Risk/Return: rr_RiskReturnAbstract  
Maximum front-end sales charge (load) imposed on purchases (as a % of the offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a % of the lesser of the offering price or the redemption price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Exchange fee rr_ExchangeFee none
Management fees rr_ManagementFeesOverAssets 1.29%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Miscellaneous expenses (includes administration fee of 0.10%) rr_Component1OtherExpensesOverAssets 0.31%
Dividend expense, borrowing costs and related interest expense attributable to securities sold short rr_Component2OtherExpensesOverAssets 0.51% [2]
Other expenses rr_OtherExpensesOverAssets 0.82%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.14% [3]
Total annual fund operating expenses rr_ExpensesOverAssets 2.25%
Management fee waiver/expense reimbursements rr_FeeWaiverOrReimbursementOverAssets 0.09% [4]
Total annual fund operating expenses after fee waiver and/or expense reimbursements rr_NetExpensesOverAssets 2.16% [4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 219 [5]
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 695 [5]
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,197 [5]
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,578 [5]
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 3.92% [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.50% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 [1]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jul. 23, 2008
[1] The returns shown above are for Class A. Previously, the returns were shown for Class C, a class of shares the fund ceased offering on July 12, 2018 and that is no longer offered through this prospectus. Class A has substantially similar annual returns to Class C because Class A is invested in the same portfolio of securities Class C was previously invested in. Class A's returns may differ from Class C's returns to the extent that Class A does not have the same expenses Class C had previously.
[2] "Dividend expense, borrowing costs and related interest expense attributable to securities sold short" are based on estimated amounts for the current fiscal year.
[3] These "Acquired fund fees and expenses" are based on estimated amounts for the current fiscal year. Since the "Acquired fund fees and expenses" are not directly borne by the fund, they are not reflected in the fund's financial statements, and therefore the amounts listed in "Total annual fund operating expenses" and "Total annual fund operating expenses after fee waiver and/or expense reimbursements" may differ from those presented in the financial highlights.
[4] The fund and UBS Asset Management (Americas) Inc. ("UBS AM") have entered into a written fee waiver/expense reimbursement agreement pursuant to which UBS AM is contractually obligated to waive its management fees through November 30, 2019 to the extent necessary to offset the cost savings to UBS AM for allocating a portion of the fund's assets to other unaffiliated pooled investment vehicles and index futures. The fee waiver/expense reimbursement agreement may be terminated by the fund's board at any time and also will terminate automatically upon the expiration or termination of the fund's advisory contract with UBS AM.
[5] Except that the expenses reflect the effects of the fund's fee waiver/expensereimbursement agreement for the first year only.