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

High current income exempt from federal income tax.
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 $100,000 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 or dealer spreads, 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 19% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 19.00%
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


Under normal circumstances, the fund invests at least 80% of its net assets (plus the amount of any borrowing for investment purposes) in municipal fixed income investments, the income from which is exempt from regular federal income taxes. The fund invests principally in investment grade municipal bonds of varying maturities. Normally, the fund limits its investments in municipal bonds that are subject to the federal alternative minimum tax ("AMT") so that not more than 25% of its interest income will be subject to the AMT, and invests in these bonds when its investment advisor believes that they offer attractive yields relative to similar municipal bonds that are not subject to the AMT.


The fund normally limits its portfolio duration to between three and seven years. Duration is a measure of the fund's exposure to interest rate risk—a longer duration means that changes in market interest rates are likely to have a larger effect on the value of the fund's portfolio.


The fund may invest up to 50% of its total assets in municipal bonds that are secured by revenues from public housing authorities and state and local housing finance authorities, including bonds that are secured or backed by the US Treasury or other US government guaranteed securities. There are different types of US government securities, including those issued or guaranteed by the US government, its agencies and its instrumentalities, and they have different types of government support. Some are supported by the full faith and credit of the US, while others are supported by (1) the ability of the issuer to borrow from the US Treasury; (2) the credit of the issuing agency, instrumentality or government-sponsored entity; (3) pools of assets, such as mortgages; or (4) the US government in some other way.


The fund limits its investments in municipal bonds with the lowest investment grade rating (or unrated bonds of equivalent quality) to 15% of its total assets at the time the bonds are purchased.


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, has the ultimate authority, subject to oversight by the fund's board, to oversee the fund's subadvisor(s) and recommend their hiring, termination and replacement, and to allocate assets among the fund's subadvisor(s).


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 understand 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 subadvisor utilizes a strategy that involves investing in undervalued sectors, geographical regions or individual securities.
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:


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.


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.


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.


Municipal securities risk: Municipal securities are subject to interest rate and credit risks. The ability of a municipal issuer to make payments and the value of municipal securities can be affected by uncertainties in the municipal securities market. Such uncertainties could cause increased volatility in the municipal securi-ties market and could negatively impact the fund's net asset value and/or the distributions paid by the fund. Municipal bonds secured by revenues from public housing authorities may be subject to additional uncertainties relating to the possibility that proceeds may exceed supply of available mortgages to be purchased by public housing authorities, resulting in early retirement of bonds, or that homeowner repayments will create an irregular cash flow. Municipalities continue to experience difficulties in the current economic and political environment.


Related securities concentration risk: Because the fund may invest more than 25% of its total assets in municipal bonds that are issued to finance similar projects, changes that affect one type of municipal bond may have a significant impact on the value of the fund.


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.
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 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 BNY Mellon Asset Management North American Corporation ("BNY Mellon AMNA") assumed day-to-day management of the fund's assets in June 2000. 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 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 Municipal Fixed Income 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: (0.89)%
Best quarter during calendar years shown—3Q 2009: 5.89%
Worst quarter during calendar years shown—4Q 2016: (3.67)%
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 (0.89%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter during calendar years shown
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 5.89%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter during calendar years shown
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2016
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (3.67%)
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® Municipal Fixed Income Investments | Bloomberg Barclays US Municipal 3-15 Year Blend Index (Index reflects no deduction for fees, expenses or taxes.)  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 4.76% [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.65% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.26% [1]
Class A & Y Prospectus | PACE® Municipal Fixed Income Investments | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum front-end sales charge (load) imposed on purchases (as a % of the offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 2.25%
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 0.43%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses (includes administration fee of 0.10%) rr_OtherExpensesOverAssets 0.23%
Total annual fund operating expenses rr_ExpensesOverAssets 0.91%
Management fee waiver/expense reimbursements rr_FeeWaiverOrReimbursementOverAssets 0.09% [2]
Total annual fund operating expenses after fee waiver and/or expense reimbursements rr_NetExpensesOverAssets 0.82% [2]
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 $100,000 in the UBS family of funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 307 [3]
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 500 [3]
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 709 [3]
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,311 [3]
Annual Return 2008 rr_AnnualReturn2008 (0.49%)
Annual Return 2009 rr_AnnualReturn2009 9.95%
Annual Return 2010 rr_AnnualReturn2010 2.47%
Annual Return 2011 rr_AnnualReturn2011 9.51%
Annual Return 2012 rr_AnnualReturn2012 4.03%
Annual Return 2013 rr_AnnualReturn2013 (1.94%)
Annual Return 2014 rr_AnnualReturn2014 6.43%
Annual Return 2015 rr_AnnualReturn2015 2.73%
Annual Return 2016 rr_AnnualReturn2016 (0.49%)
Annual Return 2017 rr_AnnualReturn2017 4.37%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 2.06% [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.71% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.35% [1]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jan. 23, 2001
Class A & Y Prospectus | PACE® Municipal Fixed Income Investments | Class A | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 2.02% [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.60% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.29% [1]
Class A & Y Prospectus | PACE® Municipal Fixed Income Investments | Class A | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 2.29% [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.87% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.24% [1]
Class A & Y Prospectus | PACE® Municipal Fixed Income 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 0.43%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (includes administration fee of 0.10%) rr_OtherExpensesOverAssets 0.28%
Total annual fund operating expenses rr_ExpensesOverAssets 0.71%
Management fee waiver/expense reimbursements rr_FeeWaiverOrReimbursementOverAssets 0.14% [2]
Total annual fund operating expenses after fee waiver and/or expense reimbursements rr_NetExpensesOverAssets 0.57% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 58 [3]
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 213 [3]
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 381 [3]
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 869 [3]
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 4.61% [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.40% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.83% [1]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 23, 2001
[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] 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 and/or reimburse expenses so that the fund's ordinary total operating expenses of each class through November 30, 2019 (excluding dividend expense, borrowing costs, and interest expense relating to short sales, and expenses attributable to investment in other investment companies, interest, taxes, brokerage commissions and extraordinary expenses) would not exceed 0.82% for Class A, and 0.57% for Class Y. The fund has agreed to repay UBS AM for any waived fees/reimbursed expenses to the extent that it can do so over the following three fiscal years without causing the fund's expenses in any of those three years to exceed these expense caps and that UBS AM has not waived the right to do so. 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. Upon termination of the agreement, however, UBS AM's three year recoupment rights will survive.
[3] Except that the expenses reflect the effects of the fund's fee waiver/expense reimbursement agreement for the first year only.