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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
ProspectusDate rr_ProspectusDate Nov. 28, 2011
PACE Small/Medium Co Growth Equity Investments (First Prospectus Summary) | PACE Small/Medium Co Growth Equity Investments
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading PACE Small/Medium Co Growth 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. 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 103 of the prospectus and in "Reduced sales charges, additional
purchase, exchange and redemption information and other services" on page 214 of
the fund's Statement of Additional Information.
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 103%
of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 103.00%
Expense Breakpoint, Discounts 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, 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 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:
 [1]
Investment Strategy, Heading rr_StrategyHeading Principal strategies
Investment Strategy, Narrative 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 (that is, companies
with a total market capitalization of less than $6.0 billion 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.

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. Copper Rock Capital Partners, LLC ("Copper Rock"), Palisade
Capital Management, L.L.C. ("Palisade") and Riverbridge Partners, LLC
("Riverbridge") 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 estimates. 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.
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.

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.

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 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 sales charges of the fund's Class C 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. 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. 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. After-tax returns for
other classes will vary from the Class C shares' after-tax returns shown. Prior
to September 30, 2003, Class C shares were subject to a maximum front-end sales
charge of 1.00%; this front end sales charge is not reflected in the average
annual total returns table for Class C shares.
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 Growth Equity Investments Annual Total Returns of Class C Shares
Bar Chart, Does Not Reflect Sales Loads rr_BarChartDoesNotReflectSalesLoads The bar chart does not reflect the sales charges of the fund's Class C shares; if it did, the total returns shown would be lower.
Bar Chart, Closing rr_BarChartClosingTextBlock 
Total return January 1 - September 30, 2011: (12.42)%
Best quarter during calendar years shown-4Q 2001: 26.48%
Worst quarter during calendar years shown-3Q 2001: (26.68)%
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 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 Table, One Class of after Tax Shown rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns for other classes will vary from the Class C shares' after-tax returns shown. Prior to September 30, 2003, Class C shares were subject to a maximum front-end sales charge of 1.00%; this front end sales charge is not reflected in the average annual total returns table for Class C shares.
Average Annual Returns, Caption rr_AverageAnnualReturnCaption Average annual total returns (for the periods ended December 31, 2010)
PACE Small/Medium Co Growth Equity Investments (First Prospectus Summary) | PACE Small/Medium Co Growth Equity Investments | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2012-11-28
PACE Small/Medium Co Growth Equity Investments (First Prospectus Summary) | PACE Small/Medium Co Growth Equity Investments | Class B
  
Risk/Return: rr_RiskReturnAbstract  
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2012-11-28
PACE Small/Medium Co Growth Equity Investments (First Prospectus Summary) | PACE Small/Medium Co Growth Equity Investments | Class C
  
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 (12.42%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter during calendar years shown-4Q 2001:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2001
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 26.48%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter during calendar years shown-3Q 2001:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2001
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (26.68%)
PACE Small/Medium Co Growth Equity Investments (First Prospectus Summary) | PACE Small/Medium Co Growth Equity Investments | Class Y
  
Risk/Return: rr_RiskReturnAbstract  
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2012-11-28
PACE Small/Medium Co Growth Equity Investments | Russell 2500 Growth Index
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Russell 2500 Growth Index (Index reflects no deduction for fees, expenses or taxes.)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 28.86%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.63%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.19%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 4.22% [2],[3]
PACE Small/Medium Co Growth Equity 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
Redemption fee (as a % of the amount redeemed within 90 days of purchase, if applicable) rr_RedemptionFeeOverRedemption (1.00%)
Exchange fee rr_ExchangeFee none
Management fees rr_ManagementFeesOverAssets 0.70%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses (includes administration fee of 0.10%) rr_OtherExpensesOverAssets 0.33%
Total annual fund operating expenses rr_ExpensesOverAssets 1.28%
Management fee waiver/expense reimbursements rr_FeeWaiverOrReimbursementOverAssets    [4]
Total annual fund operating expenses after fee waiver and/or expense reimbursements rr_NetExpensesOverAssets 1.28% [4]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 673
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 934
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,214
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,010
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class A Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 21.42%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.68%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 2.52%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception    [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Nov. 27, 2000
PACE Small/Medium Co Growth Equity Investments | Class B
  
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 5.00%
Redemption fee (as a % of the amount redeemed within 90 days of purchase, if applicable) rr_RedemptionFeeOverRedemption (1.00%)
Exchange fee rr_ExchangeFee none
Management fees rr_ManagementFeesOverAssets 0.70%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses (includes administration fee of 0.10%) rr_OtherExpensesOverAssets 1.04%
Total annual fund operating expenses rr_ExpensesOverAssets 2.74%
Management fee waiver/expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.61%) [4]
Total annual fund operating expenses after fee waiver and/or expense reimbursements rr_NetExpensesOverAssets 2.13% [4]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 716
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 1,093
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,596
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,341 [5]
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 216
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 793
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,396
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,341 [5]
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class B Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 22.39%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.68%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 2.58%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception    [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Nov. 27, 2000
PACE Small/Medium Co Growth Equity Investments | Class C
  
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 1.00%
Redemption fee (as a % of the amount redeemed within 90 days of purchase, if applicable) rr_RedemptionFeeOverRedemption (1.00%)
Exchange fee rr_ExchangeFee none
Management fees rr_ManagementFeesOverAssets 0.70%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses (includes administration fee of 0.10%) rr_OtherExpensesOverAssets 0.35%
Total annual fund operating expenses rr_ExpensesOverAssets 2.05%
Management fee waiver/expense reimbursements rr_FeeWaiverOrReimbursementOverAssets    [4]
Total annual fund operating expenses after fee waiver and/or expense reimbursements rr_NetExpensesOverAssets 2.05% [4]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 308
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 643
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,103
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,379
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 208
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 643
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,103
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,379
Annual Return 2001 rr_AnnualReturn2001 (15.05%)
Annual Return 2002 rr_AnnualReturn2002 (20.79%)
Annual Return 2003 rr_AnnualReturn2003 36.23%
Annual Return 2004 rr_AnnualReturn2004 9.86%
Annual Return 2005 rr_AnnualReturn2005 2.23%
Annual Return 2006 rr_AnnualReturn2006 7.56%
Annual Return 2007 rr_AnnualReturn2007 15.09%
Annual Return 2008 rr_AnnualReturn2008 (44.27%)
Annual Return 2009 rr_AnnualReturn2009 38.77%
Annual Return 2010 rr_AnnualReturn2010 27.40%
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class C Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 26.40%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.05%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 2.30%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception    [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Nov. 27, 2000
PACE Small/Medium Co Growth Equity Investments | Class C | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class C Return after taxes on distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 26.40%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.26%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.65%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception    [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Nov. 27, 2000
PACE Small/Medium Co Growth Equity Investments | Class C | After Taxes on Distributions and Sales
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class C Return after taxes on distributions and sale of fund shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 17.16%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.26%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.81%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception    [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Nov. 27, 2000
PACE Small/Medium Co Growth Equity 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
Redemption fee (as a % of the amount redeemed within 90 days of purchase, if applicable) rr_RedemptionFeeOverRedemption (1.00%)
Exchange fee rr_ExchangeFee none
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 0.38%
Total annual fund operating expenses rr_ExpensesOverAssets 1.08%
Management fee waiver/expense reimbursements rr_FeeWaiverOrReimbursementOverAssets    [4]
Total annual fund operating expenses after fee waiver and/or expense reimbursements rr_NetExpensesOverAssets 1.08% [4]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 110
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 343
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 595
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,317
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class Y Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 28.45%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.20%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10   
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 4.24% [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 12, 2001
[1] Except that the expenses reflect the effects of the fund's fee waiver/expense reimbursement agreement for the first year only.
[2] Life of class returns shown only for those share classes with less than ten calendar years of performance.
[3] Average annual total return for the Russell 2500 Growth Index for the life of Class Y shares.
[4] 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 of each class 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 1.38% for Class A, 2.13% for Class B, 2.13% for Class C and 1.13% for Class Y. 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 these expense caps. 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.
[5] Reflects conversion to Class A shares after a maximum of 6 years.