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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
ProspectusDate rr_ProspectusDate Nov. 28, 2011
PACE Small/Medium Co Value Equity Investments (Second Prospectus Summary) | PACE Small/Medium Co Value Equity Investments
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading PACE Small/Medium Co Value Equity Investments
Investment Objective, Heading rr_ObjectiveHeading Investment objective
investment Objective, Primary rr_ObjectivePrimaryTextBlock 
Capital appreciation.
Expense, Heading rr_ExpenseHeading Fees and expenses of the fund
Expense, Narrative 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 rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses, Caption 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 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 70%
of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 70.00%
Expense Example, Heading rr_ExpenseExampleHeading Example
Expense Example, Narrative 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:
 [1]
Investment Strategy, Heading rr_StrategyHeading Principal strategies
Investment Strategy, Narrative rr_StrategyNarrativeTextBlock 
Principal investments

The fund invests primarily in stocks of companies that are believed to be
undervalued or overlooked in the marketplace. These stocks also generally have
price-to-earnings (P/E) ratios below the market average. 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 (that is, companies with a total market
capitalization of less than $6.0 billion at the time of purchase). The fund
invests only in stocks that are traded on major exchanges or the
over-the-counter market.

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 financials 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.

Management process

UBS Global Asset Management (Americas) Inc. ("UBS Global AM"), the fund's
manager, selects investment advisors for the fund, subject to approval of the
fund's board. Buckhead Capital Management, LLC ("Buckhead"), Metropolitan West
Capital Management, LLC ("MetWest Capital") and Systematic Financial Management,
L.P. ("Systematic") 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.

Buckhead utilizes a fundamental, bottom-up, research-driven investment process
that is designed to identify companies that it believes (1) are attractively
valued; (2) have strong underlying fundamental characteristics; and (3) likely
have one or more catalysts that are expected to drive their share prices higher.
Buckhead seeks to build concentrated portfolios (typically 35-50 holdings) with
the largest positions in those companies that it believes have the highest
likelihood of outperforming the market and/or the fund's benchmark. In general,
securities will be sold if: (1) the stock's price reaches a certain price level
determined by Buckhead; (2) the stock's issuer undergoes a change that makes the
holding of the stock inconsistent with Buckhead's strategy; and/or (3) a more
attractive investment opportunity is identified. Additionally, if a security's
price appreciates such that it accounts for more than 5% of Buckhead's segment
of the fund, a portion of the holding generally will be sold to remain below
that threshold.

MetWest Capital directly researches smaller capitalization businesses it views
as "high-quality" and attempts to identify companies selling below intrinsic
value with one or more clear catalysts to realize full value within the
investment time horizon (typically two to four years). MetWest Capital utilizes
a bottom-up, fundamental, research-driven, low-risk style that it believes is
ideally suited to the small cap market segment, along with a long-term focus
that attempts to take advantage of opportunities presented by short-term
anomalies in high-quality stocks.

Systematic employs an investment approach that utilizes (1) quantitative
screening of all companies within the small/mid capitalization universe and (2)
fundamental research, which seeks to gauge investor expectations by focusing on
key revenue and margin assumptions underlying earnings estimates. Systematic's
investment philosophy is predicated on its belief that stock prices reflect the
market's estimates of earnings, and as revisions to those estimates are made by
the market, stock prices will follow suit. By focusing only on companies whose
fundamentals are improving, as confirmed by Systematic's research analysis and
as evidenced by a positive earnings surprise, Systematic's process seeks to
avoid the chances of buying stocks that have experienced significant price
depreciation and, as a result, are mistaken as value stocks. Systematic is
expected to typically invest in 60 to 90 securities, with a market
capitalization range generally consistent with that of the fund's benchmark.
Risk, Heading rr_RiskHeading Principal risks
Risk, Narrative 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.

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.

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.

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.

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.

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 rr_RiskLoseMoney You may lose money by investing in the fund.
Risk, Not Insured Depository Institution 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 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. On October 1,
2005, MetWest Capital assumed day-to-day management of a portion of the fund's
assets. On May 28, 2009, Buckhead and Systematic each assumed responsibility for
managing a separate portion of the fund's assets. 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 rr_PerformanceInformationIllustratesVariabilityOfReturns The performance information that follows shows the fund's performance information in a bar chart and an average annual total returns table.
Performance, Availability Website Address rr_PerformanceAvailabilityWebSiteAddress http://globalam-us.ubs.com/corpweb/performance.do
Performance, Past Does Not Indicate Future 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 Value Equity Investments Annual Total Returns of Class P Shares
Bar Chart, Does Not Reflect Sales Loads 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.
Bar Chart, Closing rr_BarChartClosingTextBlock 
Total return January 1 - September 30, 2011: (20.78)%
Best quarter during calendar years shown-2nd Q 2009: 27.55%
Worst quarter during calendar years shown-4th Q 2008: (27.67)%
Index No Deduction for Fees, Expenses, Taxes 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 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 Table, One Class of after Tax Shown rr_PerformanceTableOneClassOfAfterTaxShown Actual after-tax returns depend on an investor's tax situation and may differ from those shown.
Average Annual Returns, Caption rr_AverageAnnualReturnCaption Average annual total returns (for the periods ended December 31, 2010)
PACE Small/Medium Co Value Equity Investments (Second Prospectus Summary) | PACE Small/Medium Co Value Equity Investments | Class P
  
Risk/Return: rr_RiskReturnAbstract  
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2012-11-28
Year to Date Return, Label rr_YearToDateReturnLabel Total return January 1 - September 30, 2011:
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2011
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (20.78%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter during calendar years shown-2nd Q 2009:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 27.55%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter during calendar years shown-4th Q 2008:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (27.67%)
PACE Small/Medium Co Value Equity Investments | Russell 2500 Value Index
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Russell 2500 Value Index (Index reflects no deduction for fees, expenses or taxes.)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 24.82%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.85%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.53%
PACE Small/Medium Co Value Equity Investments | Class P
  
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 offering price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee (as a % of the amount redeemed within 90 days of purchase, if applicable) 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%
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 0.47%
Total annual fund operating expenses rr_ExpensesOverAssets 1.17%
Management fee waiver/expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.01%) [2]
Total annual fund operating expenses after fee waiver and/or expense reimbursements rr_NetExpensesOverAssets 1.16% [2]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 319
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 976
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,658
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 3,475
Annual Return 2001 rr_AnnualReturn2001 21.17%
Annual Return 2002 rr_AnnualReturn2002 (15.82%)
Annual Return 2003 rr_AnnualReturn2003 38.65%
Annual Return 2004 rr_AnnualReturn2004 17.93%
Annual Return 2005 rr_AnnualReturn2005 3.10%
Annual Return 2006 rr_AnnualReturn2006 10.87%
Annual Return 2007 rr_AnnualReturn2007 (2.28%)
Annual Return 2008 rr_AnnualReturn2008 (35.25%)
Annual Return 2009 rr_AnnualReturn2009 36.18%
Annual Return 2010 rr_AnnualReturn2010 23.30%
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class P Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 20.85%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.28%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.19%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Aug. 24, 1995
PACE Small/Medium Co Value Equity Investments | Class P | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class P Return after taxes on distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 20.85%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.61%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.21%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Aug. 24, 1995
PACE Small/Medium Co Value Equity Investments | Class P | After Taxes on Distributions and Sales
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class P Return after taxes on distributions and sale of fund shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 13.56%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.92%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.32%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Aug. 24, 1995
[1] Except that the expenses reflect the effects of the fund's fee waiver/expense reimbursement agreement for the first year only.
[2] 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 November 28, 2012 (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 1.16%. 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.