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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading UBS U.S. EQUITY OPPORTUNITY FUND
Objective [Heading] rr_ObjectiveHeading Investment objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Fund seeks to maximize total return, consisting of capital appreciation and current income.

Expense [Heading] rr_ExpenseHeading Fees and expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

These tables describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for a sales charge waiver or discount if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund. 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 51 of the Fund's prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 117 of the Fund's statement of additional information ("SAI").

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2015-10-27
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 62% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 62.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for a sales charge waiver or discount if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
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 sell 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. The costs described in the example reflect the expenses of the Fund that would result from the contractual fee waiver and expense reimbursement agreement with the Advisor for the first year only. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Strategy [Heading] rr_StrategyHeading Principal strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Principal investments


Under normal circumstances, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes, if any) in equity securities of US companies. The Fund primarily invests in large capitalization companies, but may invest in companies of any size. The Fund may invest up to 20% of its net assets in securities of foreign companies in both developed and emerging markets. Investments in equity securities may include, but are not limited to, dividend-paying securities, common stock, preferred stock, shares of investment companies, convertible securities, warrants and rights.


The Fund may, but is not required to, use exchange-traded or over-the-counter ("OTC") derivative instruments for risk management purposes or as part of the Fund's investment strategies. Generally, derivatives are financial contracts whose value depends upon, or is derived from, the value of an underlying asset, reference rate, or index, and may relate to stocks, bonds, interest rates, currencies or currency exchange rates, and related indexes. The derivatives in which the Fund may invest include futures on indices or currencies and foward currency agreements, which may be used for risk management purposes to manage or adjust the risk profile of the Fund. Futures on currencies and forward currency agreements may also be used to hedge against a specific currency. In addition, futures on indices may be used for investment (non-hedging) purposes to earn income; to enhance returns; to replace more traditional direct investments; or to obtain exposure to certain markets.


Management process


In selecting securities, the Advisor focuses on, among other things, identifying discrepancies between a security's fundamental value and its market price. In this context, the fundamental value of a given security is the Advisor's assessment of what a security is worth. The Fund will select a security whose fundamental value it estimates to be greater than its market value at any given time. For each stock under analysis, the Advisor bases its estimates of value upon economic, industry and company analysis, as well as upon a company's management team, competitive advantage and core competencies. The Advisor then compares its assessment of a security's value against the prevailing market prices with the aim of constructing a focused portfolio of stocks with attractive relative price/value characteristics. Although the Fund is a diversified fund under the Investment Company Act of 1940, as amended (the "1940 Act"), the Fund employs a focused investment strategy that may result in the Fund investing in a lesser number of issuers than other equity mutual funds. At times, the investment approach may lead the Advisor to have sizeable allocations to particular markets, sectors and industries.

Risk [Heading] rr_RiskHeading Main 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 the bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Below are some of the specific risks of investing in the Fund.


Market risk: 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.


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


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.


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.


Limited number of issuers risk: The Fund may invest in a limited number of issuers compared to other mutual funds and, consequently, may invest a greater portion of its assets in one or more issuers than other mutual funds. The Fund, therefore, may be more sensitive to a single economic, business, political, regulatory or other occurrence, which may result in greater fluctuation in the value of the Fund's shares and to a greater risk of loss.


Derivatives risk: The value of "derivatives"—so called because their value "derives" from the value of an underlying asset, reference rate or index—may rise or fall more rapidly than other investments. It is possible for the Fund to lose more than the amount it invested in the derivative. The risks of investing in derivative instruments also include market risk, management risk and counterparty risk (which is the risk that a counterparty to a derivative contract is unable or unwilling to meet its financial obligations). In addition, non-exchange traded derivatives may be subject to liquidity risk, credit risk and mispricing or valuation complexity. These derivatives risks are different from, and may be greater than, the risks associated with investing directly in securities and other instruments.


Leverage risk associated with financial instruments: The use of financial instruments to increase potential returns, including derivatives used for investment (non-hedging) purposes, may cause the Fund to be more volatile than if it had not been leveraged. The use of leverage may also accelerate the velocity of losses and can result in losses to the Fund that exceed the amount originally invested.

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 the 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 Risk/return bar chart and table
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The performance information that follows shows the Fund's performance information in a bar chart and an average annual total returns table. 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. Index reflects no deduction for fees, expenses or taxes. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. On December 30, 2011, the Fund's investment strategy, including its 80% policy, changed. The performance information below, prior to that date, is attributable to the Fund's previous investment strategy. 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 P shares' after-tax returns shown.

Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The information provides some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual total returns compare with those of a broad measure of market performance.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress 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 Total return UBS U.S. Equity Opportunity Fund Annual Total Returns of Class P Shares
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Total return January 1 - September 30, 2014: 7.02%
Best quarter during calendar years shown—2Q 2009: 19.76%
Worst quarter during calendar years shown—4Q 2008: (25.45)%

Year to Date Return, Label rr_YearToDateReturnLabel Total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2014
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 7.02%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.76%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (25.45%)
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 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 [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns for other classes will vary from the Class P shares' after-tax returns shown.
Caption rr_AverageAnnualReturnCaption Average annual total returns (figures reflect sales charges) (for the periods ended December 31, 2013)
Russell 1000 Index
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 33.11%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 18.59%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.78%
CLASS A
  
Risk/Return: rr_RiskReturnAbstract  
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less) rr_MaximumDeferredSalesChargeOverOther none [1]
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Management fees rr_ManagementFeesOverAssets 0.70%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.77% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.72% [2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.52%)
Total annual fund operating expenses after management fee waiver/expense reimbursements rr_NetExpensesOverAssets 1.20% [2],[3]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Purchases of $1 million or more that were not subject to a front-end sales charge are subject to a 1% CDSC if sold within one year of the purchase date.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 666
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,014
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,386
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,428
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 24.52%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 12.73%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.88%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 07, 2001
CLASS C
  
Risk/Return: rr_RiskReturnAbstract  
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less) rr_MaximumDeferredSalesChargeOverOther 1.00%
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Management fees rr_ManagementFeesOverAssets 0.70%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.80% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 2.50% [2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.55%)
Total annual fund operating expenses after management fee waiver/expense reimbursements rr_NetExpensesOverAssets 1.95% [2],[3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 298
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 726
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,281
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,795
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 198
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 726
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,281
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,795
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 30.03%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 13.16%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.70%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 12, 2001
CLASS P
  
Risk/Return: rr_RiskReturnAbstract  
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less) rr_MaximumDeferredSalesChargeOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Management fees rr_ManagementFeesOverAssets 0.70%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.82% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.52% [2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.57%)
Total annual fund operating expenses after management fee waiver/expense reimbursements rr_NetExpensesOverAssets 0.95% [2],[3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 97
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 424
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 775
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,764
Annual Return 2004 rr_AnnualReturn2004 14.25%
Annual Return 2005 rr_AnnualReturn2005 10.00%
Annual Return 2006 rr_AnnualReturn2006 18.57%
Annual Return 2007 rr_AnnualReturn2007 0.47%
Annual Return 2008 rr_AnnualReturn2008 (40.09%)
Annual Return 2009 rr_AnnualReturn2009 23.00%
Annual Return 2010 rr_AnnualReturn2010 10.92%
Annual Return 2011 rr_AnnualReturn2011 (5.94%)
Annual Return 2012 rr_AnnualReturn2012 15.04%
Annual Return 2013 rr_AnnualReturn2013 32.31%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 32.31%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 14.33%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.77%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 29, 2001
CLASS P | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 32.12%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 14.09%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.62%
CLASS P | After Taxes on Distributions and Sale of Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 18.43%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 11.57%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.80%
[1] Purchases of $1 million or more that were not subject to a front-end sales charge are subject to a 1% CDSC if sold within one year of the purchase date.
[2] "Other expenses" include "Acquired fund fees and expenses," which were less than 0.01% of average net assets of the Fund.
[3] The Trust, with respect to the Fund, and UBS Global Asset Management (Americas) Inc., the Fund's investment advisor ("UBS Global AM (Americas)" or the "Advisor"), have entered into a written agreement pursuant to which the Advisor has agreed to waive a portion of its management fees and/or to reimburse expenses (excluding expenses incurred through investment in other investment companies, interest, taxes, brokerage commissions and extraordinary expenses) to the extent necessary so that the Fund's ordinary operating expenses (excluding expenses incurred through investment in other investment companies, interest, taxes, brokerage commissions and extraordinary expenses), through the period ending October 27, 2015, do not exceed 1.20% for Class A shares, 1.95% for Class C shares and 0.95% for Class P shares. Pursuant to the written agreement, the Advisor is entitled to be reimbursed for any fees it waives and expenses it reimburses for a period of three years following such fee waivers and expense reimbursements to the extent that such reimbursement of the Advisor by the Fund will not cause the Fund to exceed any applicable expense limit that is in place for the Fund. The fee waiver/expense reimbursement agreement may be terminated by the Fund's Board of Trustees at any time and also will terminate automatically upon the expiration or termination of the Fund's advisory contract with the Advisor. Upon termination of the fee waiver/expense reimbursement agreement, however, the UBS Global AM (Americas)'s three year recoupment rights will survive.