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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
ProspectusDate rr_ProspectusDate Nov. 28, 2011
PACE Large Co Value Equity Investments (First Prospectus Summary) | PACE Large Co Value Equity Investments
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading PACE Large Co Value Equity Investments
Investment Objective, Heading rr_ObjectiveHeading Investment objective
investment Objective, Primary rr_ObjectivePrimaryTextBlock 
Capital appreciation and dividend income.
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 49%
of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 49.00%
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 US companies that are believed to be
undervalued. 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 large capitalization companies (that is, companies with a
total market capitalization of $3.0 billion or greater at the time of purchase).
The fund seeks income primarily from dividend paying stocks.

The fund may invest, to a lesser extent, in other securities, such as securities
convertible into stocks, initial public offerings (IPOs) and stocks of companies
with smaller total market capitalizations. The fund may invest up to 20% of its
total assets in non-US securities, which may trade either within or outside the
US.

Management process

The fund's manager, UBS Global Asset Management (Americas) Inc. ("UBS Global
AM"), selects investment advisors for the fund, subject to approval of the
fund's board. Institutional Capital LLC ("ICAP"), Westwood Management Corp.
("Westwood") and Pzena Investment Management, LLC ("Pzena") 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.

ICAP's investment process involves the use of its proprietary valuation model to
identify large capitalization companies that it believes offer the best relative
values, and ICAP seeks to avoid companies that are exhibiting excessive
deterioration in earnings trends. ICAP focuses on what it believes are the key
investment variables (catalysts) that could potentially impact the security's
market value. These catalysts are primarily company specific, such as a new
product, restructuring or change in management, but occasionally the catalyst
can be thematic (e.g., dependent on macroeconomic or industry trends). After a
review of stock recommendations, ICAP's portfolio management team determines
whether to add the stock to the portfolio or to monitor it for future purchase.
ICAP continuously monitors each security and evaluates whether to eliminate it
when its price target is achieved, the catalyst becomes inoperative or another
stock offers a greater opportunity.

Westwood's strategy utilizes a value style of investing in which it chooses
common stocks that it believes are currently undervalued in the market. Other
key metrics for evaluating the risk/return profile of an investment include an
improving return on equity, a declining debt/equity ratio and, in the case of
common equities, positive earnings surprises without a corresponding increase in
Wall Street estimates. Westwood has disciplines in place that serve as sell
signals, such as a security reaching a predetermined price target or a change to
a company's fundamentals that negatively impacts the original investment thesis.

Pzena's strategy follows a disciplined investment process to implement its value
philosophy, by focusing exclusively on companies that are underperforming their
historically demonstrated earnings power. Pzena applies intensive fundamental
research to these companies in an effort to determine whether such
underperformance is temporary or permanent. Pzena looks for companies where: (1)
the current valuation is low compared to the company's normalized earnings
power; (2) current earnings are below historic norms; (3) the problems are
temporary; (4) management has a viable strategy to generate earnings recovery;
and (5) there is meaningful downside protection in case the earnings recovery
does not materialize.
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.

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.

Initial public offerings risk: The purchase of shares issued in IPOs may expose
the fund to the risks associated with issuers that have no operating history as
public companies, as well as to the risks associated with the sectors of the
market in which the issuer operates. The market for IPO shares may be volatile,
and share prices of newly-public companies may fluctuate significantly over a
short period of time.

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. ICAP and
Westwood each assumed day-to-day management of a separate portion of the fund's
assets on July 1, 2000. Pzena assumed day-to-day management of another portion
of the fund's assets on May 27, 2008. 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 Large Co Value 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: (14.28)%
Best quarter during calendar years shown-2Q 2009: 18.27%
Worst quarter during calendar years shown-4Q 2008: (22.79)%
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 Large Co Value Equity Investments (First Prospectus Summary) | PACE Large Co Value Equity Investments | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2012-11-28
PACE Large Co Value Equity Investments (First Prospectus Summary) | PACE Large Co Value Equity Investments | Class B
  
Risk/Return: rr_RiskReturnAbstract  
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2012-11-28
PACE Large Co Value Equity Investments (First Prospectus Summary) | PACE Large Co Value 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 (14.28%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter during calendar years shown-2Q 2009:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 18.27%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter during calendar years shown-4Q 2008:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.79%)
PACE Large Co Value Equity Investments (First Prospectus Summary) | PACE Large Co Value Equity Investments | Class Y
  
Risk/Return: rr_RiskReturnAbstract  
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2012-11-28
PACE Large Co Value Equity Investments | Russell 1000 Value Index
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Russell 1000 Value Index (Index reflects no deduction for fees, expenses or taxes.)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 15.51%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.28%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.26%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.56% [2],[3]
PACE Large Co Value 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 0.65%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses (includes administration fee of 0.10%) rr_OtherExpensesOverAssets 0.27%
Total annual fund operating expenses rr_ExpensesOverAssets 1.17%
Management fee waiver/expense reimbursements rr_FeeWaiverOrReimbursementOverAssets    [4]
Total annual fund operating expenses after fee waiver and/or expense reimbursements rr_NetExpensesOverAssets 1.17% [4]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 663
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 901
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,158
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,892
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class A Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 8.79%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.48%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 2.56%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception    [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Nov. 27, 2000
PACE Large Co Value 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 0.65%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses (includes administration fee of 0.10%) rr_OtherExpensesOverAssets 0.69%
Total annual fund operating expenses rr_ExpensesOverAssets 2.34%
Management fee waiver/expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.32%) [4]
Total annual fund operating expenses after fee waiver and/or expense reimbursements rr_NetExpensesOverAssets 2.02% [4]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 705
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 1,000
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,421
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,086 [5]
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 205
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 700
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,221
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,086 [5]
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class B Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 9.10%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.45%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 2.65%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception    [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Nov. 27, 2000
PACE Large Co Value 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 0.65%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses (includes administration fee of 0.10%) rr_OtherExpensesOverAssets 0.31%
Total annual fund operating expenses rr_ExpensesOverAssets 1.96%
Management fee waiver/expense reimbursements rr_FeeWaiverOrReimbursementOverAssets    [4]
Total annual fund operating expenses after fee waiver and/or expense reimbursements rr_NetExpensesOverAssets 1.96% [4]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 299
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 615
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,057
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,285
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 199
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 615
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,057
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,285
Annual Return 2001 rr_AnnualReturn2001 (4.65%)
Annual Return 2002 rr_AnnualReturn2002 (17.69%)
Annual Return 2003 rr_AnnualReturn2003 25.72%
Annual Return 2004 rr_AnnualReturn2004 11.98%
Annual Return 2005 rr_AnnualReturn2005 9.52%
Annual Return 2006 rr_AnnualReturn2006 17.70%
Annual Return 2007 rr_AnnualReturn2007 3.53%
Annual Return 2008 rr_AnnualReturn2008 (40.48%)
Annual Return 2009 rr_AnnualReturn2009 25.92%
Annual Return 2010 rr_AnnualReturn2010 14.12%
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class C Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 13.12%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.83%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 2.35%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception    [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Nov. 27, 2000
PACE Large Co Value 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 13.12%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (0.06%)
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.85%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception    [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Nov. 27, 2000
PACE Large Co Value 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 8.53%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.62%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.98%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception    [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Nov. 27, 2000
PACE Large Co Value 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 0.65%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (includes administration fee of 0.10%) rr_OtherExpensesOverAssets 0.29%
Total annual fund operating expenses rr_ExpensesOverAssets 0.94%
Management fee waiver/expense reimbursements rr_FeeWaiverOrReimbursementOverAssets    [4]
Total annual fund operating expenses after fee waiver and/or expense reimbursements rr_NetExpensesOverAssets 0.94% [4]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 96
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 300
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 520
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,155
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class Y Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 15.32%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.98%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10   
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.79% [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jan. 19, 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 1000 Value 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 1.27% for Class A, 2.02% for Class B, 2.02% for Class C and 1.02% 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.