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Risk/Return:rr_RiskReturnAbstract 
ProspectusDaterr_ProspectusDateOct. 28, 2011
UBS U.S. SMALL CAP EQUITY FUND (Prospectus Summary) | UBS U.S. SMALL CAP EQUITY FUND
 
Risk/Return:rr_RiskReturnAbstract 
Risk/Return, Headingrr_RiskReturnHeadingUBS U.S. Small Cap Equity Fund Summary
Investment Objective, Headingrr_ObjectiveHeadingInvestment objective
investment Objective, Primaryrr_ObjectivePrimaryTextBlock
The Fund seeks to maximize total return, consisting of capital appreciation and
current income.
Expense, Headingrr_ExpenseHeadingFees and expenses
Expense, Narrativerr_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 13 of the Fund's
prospectus and in "Reduced sales charges, additional purchase, exchange and
redemption information and other services" on page 57 of the Fund's statement of
additional information ("SAI").
Shareholder Fees, Captionrr_ShareholderFeesCaptionShareholder fees (fees paid directly from your investment)
Operating Expenses, Captionrr_OperatingExpensesCaptionAnnual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover, Headingrr_PortfolioTurnoverHeadingPortfolio turnover
Portfolio Turnoverrr_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.
Expense Breakpoint, Discountsrr_ExpenseBreakpointDiscountsYou may qualify for a sales charge waiver or discount if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund.
Expense Breakpoint, Minimum Investment Required Amountrr_ExpenseBreakpointMinimumInvestmentRequiredAmount$ 50,000
Other Expenses, New Fund, Based on Estimatesrr_OtherExpensesNewFundBasedOnEstimates"Other expenses" are based on estimates for the current fiscal year.
Expense Example, Headingrr_ExpenseExampleHeadingExample
Expense Example, Narrativerr_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:
Investment Strategy, Headingrr_StrategyHeadingPrincipal strategies
Investment Strategy, Narrativerr_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
small capitalization companies. Small capitalization companies are those
companies with market capitalizations of less than $3 billion. Investments in
equity securities may include, but are not limited to, dividend-paying
securities, common stock and preferred stock. The Fund is a non-diversified
fund.

The Fund may, but is not required to, use derivative instruments for risk
management purposes or as part of the Fund's investment strategies. The
derivatives in which the Fund may invest include futures on indices, which may
be used for risk management purposes to manage or adjust the risk profile of the
Fund. 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.

Under certain market conditions, the Fund may invest in companies at the time of
their initial public offering ("IPO").

Management process

The Advisor looks for companies with strong and innovative management, good
financial controls, increasing market share, diversified product/service
offerings and low market-to-sales ratios relative to similar companies. 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 portfolio of stocks with attractive
relative price/value characteristics.

The Fund will invest in companies within its capitalization range as described
above. However, the Fund may invest a portion of its assets in securities
outside of this range. Further, if movement in the market price causes a
security to change from one capitalization range to another, the Fund is not
required to dispose of the security.
Risk, Headingrr_RiskHeadingMain risks
Risk, Narrativerr_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.

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.

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

Non-diversification risk: The Fund is a non-diversified investment company,
which means that the Fund may invest more of its assets in a smaller number of
issuers than a diversified investment company. As a non-diversified fund, the
Fund's share price may be more volatile and the Fund has a greater potential to
realize losses upon the occurrence of adverse events affecting a particular
issuer.

IPOs 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.

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. When using derivatives for
non-hedging purposes, 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 and management risks. 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 Moneyrr_RiskLoseMoneyYou may lose money by investing in the Fund.
Risk, Nondiversified Statusrr_RiskNondiversifiedStatusThe Fund is a non-diversified investment company, which means that the Fund may invest more of its assets in a smaller number of issuers than a diversified investment company. As a non-diversified fund, the Fund's share price may be more volatile and the Fund has a greater potential to realize losses upon the occurrence of adverse events affecting a particular issuer.
Risk, Not Insured Depository Institutionrr_RiskNotInsuredDepositoryInstitutionAn 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, Headingrr_BarChartAndPerformanceTableHeadingPerformance
Performance, Narrativerr_PerformanceNarrativeTextBlock
There is no performance information quoted for the Fund as the Fund had not
commenced investment operations as of the date of this prospectus.
Performance, One Year or Lessrr_PerformanceOneYearOrLessThere is no performance information quoted for the Fund as the Fund had not commenced investment operations as of the date of this prospectus.
UBS U.S. SMALL CAP EQUITY FUND (Prospectus Summary) | UBS U.S. SMALL CAP EQUITY FUND | CLASS A
 
Risk/Return:rr_RiskReturnAbstract 
Fee Waiver or Reimbursement over Assets, Date of Terminationrr_FeeWaiverOrReimbursementOverAssetsDateOfTermination2012-10-27
UBS U.S. SMALL CAP EQUITY FUND (Prospectus Summary) | UBS U.S. SMALL CAP EQUITY FUND | CLASS C
 
Risk/Return:rr_RiskReturnAbstract 
Fee Waiver or Reimbursement over Assets, Date of Terminationrr_FeeWaiverOrReimbursementOverAssetsDateOfTermination2012-10-27
UBS U.S. SMALL CAP EQUITY FUND (Prospectus Summary) | UBS U.S. SMALL CAP EQUITY FUND | CLASS Y
 
Risk/Return:rr_RiskReturnAbstract 
Fee Waiver or Reimbursement over Assets, Date of Terminationrr_FeeWaiverOrReimbursementOverAssetsDateOfTermination2012-10-27
UBS U.S. SMALL CAP EQUITY FUND | CLASS A
 
Risk/Return:rr_RiskReturnAbstract 
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice5.50%
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee (as a percentage of amount redeemed within 90 days of purchase, if applicable)rr_RedemptionFeeOverRedemption(1.00%)
Management feesrr_ManagementFeesOverAssets1.00%
Distribution and/or service (12b-1) feesrr_DistributionAndService12b1FeesOverAssets0.25%
Other expensesrr_OtherExpensesOverAssets0.60%[1]
Total annual fund operating expensesrr_ExpensesOverAssets1.85%
Less management fee waiver/expense reimbursementsrr_FeeWaiverOrReimbursementOverAssets(0.45%)
Total annual fund operating expenses after management fee waiver/expense reimbursementsrr_NetExpensesOverAssets1.40%[2]
Expense Example, With Redemption, 1 Yearrr_ExpenseExampleYear01685
Expense Example, With Redemption, 3 Yearsrr_ExpenseExampleYear031,058
UBS U.S. SMALL CAP EQUITY FUND | 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_MaximumDeferredSalesChargeOverOfferingPrice1.00%
Redemption fee (as a percentage of amount redeemed within 90 days of purchase, if applicable)rr_RedemptionFeeOverRedemption(1.00%)
Management feesrr_ManagementFeesOverAssets1.00%
Distribution and/or service (12b-1) feesrr_DistributionAndService12b1FeesOverAssets1.00%
Other expensesrr_OtherExpensesOverAssets0.60%[1]
Total annual fund operating expensesrr_ExpensesOverAssets2.60%
Less management fee waiver/expense reimbursementsrr_FeeWaiverOrReimbursementOverAssets(0.45%)
Total annual fund operating expenses after management fee waiver/expense reimbursementsrr_NetExpensesOverAssets2.15%[2]
Expense Example, With Redemption, 1 Yearrr_ExpenseExampleYear01318
Expense Example, With Redemption, 3 Yearsrr_ExpenseExampleYear03766
Expense Example, No Redemption, 1 Yearrr_ExpenseExampleNoRedemptionYear01218
Expense Example, No Redemption, 3 Yearsrr_ExpenseExampleNoRedemptionYear03766
UBS U.S. SMALL CAP EQUITY FUND | CLASS Y
 
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_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee (as a percentage of amount redeemed within 90 days of purchase, if applicable)rr_RedemptionFeeOverRedemption(1.00%)
Management feesrr_ManagementFeesOverAssets1.00%
Distribution and/or service (12b-1) feesrr_DistributionAndService12b1FeesOverAssets none
Other expensesrr_OtherExpensesOverAssets0.60%[1]
Total annual fund operating expensesrr_ExpensesOverAssets1.60%
Less management fee waiver/expense reimbursementsrr_FeeWaiverOrReimbursementOverAssets(0.45%)
Total annual fund operating expenses after management fee waiver/expense reimbursementsrr_NetExpensesOverAssets1.15%[2]
Expense Example, With Redemption, 1 Yearrr_ExpenseExampleYear01117
Expense Example, With Redemption, 3 Yearsrr_ExpenseExampleYear03$ 461
[1]"Other expenses" are based on estimates for the current fiscal year.
[2]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, 2012, do not exceed 1.40% for Class A shares, 2.15% for Class C shares and 1.15% for Class Y 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.