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Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading PACE® Small/Medium Co Growth Equity Investments
Objective [Heading] rr_ObjectiveHeading Investment objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

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.

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
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_MaximumDeferredSalesChargeOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Maximum annual account fee for PACE Select Advisors Program (as a % of average value of shares held on the last calendar day of the previous quarter) rr_MaximumAccountFeeOverAssets 2.00%
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)
Management fees rr_ManagementFeesOverAssets 0.70%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (includes administration fee of 0.10%) rr_OtherExpensesOverAssets 0.44%
Total annual fund operating expenses rr_ExpensesOverAssets 1.14%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [1]
Total annual fund operating expenses after fee waiver and/or expense reimbursements rr_NetExpensesOverAssets 1.13% [1]
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2015-03-31
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 60% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 60.00%
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. 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:

Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 316 [2]
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 968 [2]
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,644 [2]
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 3,447 [2]
Strategy [Heading] rr_StrategyHeading Principal strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock


Principal investments


The fund invests primarily in stocks of "emerging growth" companies that are believed to have potential for high future earnings growth relative to the overall market. Under normal circumstances, the fund invests at least 80% of its net assets (plus the amount of any borrowing for investment purposes) in equity securities issued by small/medium capitalization companies. As of the date of this prospectus, small/medium capitalization companies means companies with a total market capitalization of less than $6.0 billion at the time of purchase. Effective April 28, 2014, small/medium capitalization companies means companies with a total market capitalization within the market capitalization range of the companies in the Russell 2500® Growth Index at the time of purchase. Dividend income is an incidental consideration in the investment advisors' selection of stocks for the fund.


The fund may from time to time invest a significant portion of its assets in the stocks of companies in various economic sectors, such as healthcare or technology. The fund may invest, to a limited extent, in stocks of companies with larger total market capitalizations and other securities, including securities convertible into stocks. The fund may invest up to 10% of its total assets in non-US securities, which may trade either within or outside the US.


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


Management process


The fund employs a "manager of managers" structure. UBS Global Asset Management (Americas) Inc. ("UBS Global 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 investment advisor(s) and recommend their hiring, termination and replacement. Copper Rock Capital Partners, LLC ("Copper Rock"), Palisade Capital Management, L.L.C. ("Palisade"), Riverbridge Partners, LLC ("Riverbridge"), Lee Munder Capital Group, LLC ("LMCG") and Timpani Capital Management LLC ("Timpani") currently serve as the fund's investment advisors. The relative value of each investment advisor's share of the fund's assets may change over time.


Copper Rock employs a fundamental, bottom-up investment approach that focuses on identifying emerging companies that exhibit the potential for strong and sustainable revenue growth over each of the following two years. Copper Rock believes that incremental margin expansion and proven management are key factors that propel a company's growth. Copper Rock will typically hold 70 to 90 equity positions that are diversified across sectors and industries. Copper Rock utilizes a "pure" growth investment style that emphasizes growth and momentum characteristics, and attempts to manage risk by diversifying and understanding its holdings and employing a stringent sell discipline.


Palisade seeks fundamentally strong and dynamic small and mid cap companies that are trading at a discount to their growth rates. Palisade's goal is to ascertain a dynamic of change before it manifests in consensus es- timates. Palisade believes that the small and mid cap market is inherently less efficient than the large cap market, and attempts to gain an informational advantage by committing to the labor intensive process of conducting bottom-up fundamental research on small and mid cap companies, as well as their customers, competitors and supply chains. Palisade places heavy emphasis on the effectiveness of a small/mid cap company's management team and seeks direct access to a variety of each company's key decision-makers.


Riverbridge believes that earnings power determines the value of a franchise. Riverbridge focuses on companies that are viewed as building their earnings power and building the intrinsic value of the company over long periods of time. Riverbridge looks to invest in high-quality growth companies that demonstrate the ability to sustain strong secular earnings growth, regardless of overall economic conditions.


LMCG seeks to achieve competitive returns in small/medium capitalization companies by identifying unrecognized growth potential, wherever it exists across all industry sectors. LMCG seeks to identify firms with high quality business models, distinct competitive advantages, proven management teams, and significant growth potential. Revenue growth, margin expansion, and the ability to positively surprise and revise earnings estimates are key characteristics in LMCG's holdings. LMCG seeks to identify firms that have duration and sustainability of these characteristics based on their competitive positions in their respective industries.


Timpani seeks to invest in small cap companies where growth is robust, sustainable and underestimated by the market. Timpani uses fundamental research, focusing on companies that it believes have superior management and whose business models have a high potential for earnings upside. Timpani forms an investment decision based on this research and an assessment of the market's perception of these companies. Timpani may invest in any sector, may emphasize one or more particular sectors and may sell a company's stock when it believes a company's prospects for growth have diminished. Timpani may also sell or reduce a portfolio position when it sees market sentiment turn negative on a stock held in the portfolio.

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:


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.


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.


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.


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.


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.


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.


Management risk: The risk that the investment strategies, techniques and risk analyses employed by an investment advisor may not produce the desired results.

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 maximum annual PACE Select Advisors Program fee; 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. This may be particularly true given that other investment advisors were responsible for managing portions of the fund's assets during previous periods. Riverbridge assumed day-to-day management of a portion of the fund's assets on October 1, 2005. Copper Rock assumed responsibility for managing a separate portion of the fund's assets on March 1, 2007. Palisade assumed day-to-day management of a separate portion of the fund's assets on February 2, 2009. LMCG and Timpani assumed day-to-day management of a separate portion of the fund's assets on November 25, 2013. Updated performance for the fund is available at http://globalam-us.ubs.com/corpweb/performance.do.


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-deferred arrangements, such as 401(k) plans or individual retirement accounts.

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 http://globalam-us.ubs.com/corpweb/performance.do
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 Small/Medium Co Growth Equity Investments Annual Total Returns of Class P Shares
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The bar chart does not reflect the maximum annual PACE Select Advisors Program fee; if it did, the total returns shown would be lower.
Annual Return 2004 rr_AnnualReturn2004 11.01%
Annual Return 2005 rr_AnnualReturn2005 3.28%
Annual Return 2006 rr_AnnualReturn2006 8.59%
Annual Return 2007 rr_AnnualReturn2007 16.21%
Annual Return 2008 rr_AnnualReturn2008 (43.74%)
Annual Return 2009 rr_AnnualReturn2009 40.23%
Annual Return 2010 rr_AnnualReturn2010 28.69%
Annual Return 2011 rr_AnnualReturn2011 (2.00%)
Annual Return 2012 rr_AnnualReturn2012 16.79%
Annual Return 2013 rr_AnnualReturn2013 38.88%
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best quarter during calendar years shown—2Q 2009: 20.64%
Worst quarter during calendar years shown—4Q 2008: (26.31)% 		 
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 20.64%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter during calendar years shown
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (26.31%)
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-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Caption rr_AverageAnnualReturnCaption Average annual total returns (figures reflect 2% PACE Select Advisors Program Fee) (for the periods ended December 31, 2013)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 36.13%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 21.01%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 6.69%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Aug. 24, 1995
After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 31.84%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 20.16%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.68%
After Taxes on Distributions and Sale of Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 23.04%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 17.12%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.28%
Russell 2500 Growth Index (Index reflects no deduction for fees, expenses or taxes.)
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 40.65%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 24.03%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 10.11%
[1] The fund and UBS Global Asset Management (Americas) Inc. ("UBS Global AM") have entered into a written fee waiver/expense reimbursement agreement pursuant to which UBS Global AM is contractually obligated to waive its management fees and/or reimburse expenses so that the fund's ordinary total operating expenses through March 31, 2015 (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 1.13%. The fund has agreed to repay UBS Global 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 this expense cap. 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 Global AM. Upon termination of the agreement, however, UBS Global AM's three year recoupment rights will survive.
[2] Except that the expenses reflect the effects of the fund's fee waiver/expense reimbursement agreement for the first year only.