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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
ProspectusDate rr_ProspectusDate Nov. 28, 2011
PACE Municipal Fixed Income Investments (First Prospectus Summary) | PACE Municipal Fixed Income Investments
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading PACE Municipal Fixed Income Investments
Investment Objective, Heading rr_ObjectiveHeading Investment objective
investment Objective, Primary rr_ObjectivePrimaryTextBlock 
High current income exempt from federal income tax.
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 $100,000 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 34%
of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 34.00%
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 $100,000 in the UBS family of funds.
Expense Breakpoint, Minimum Investment Required Amount rr_ExpenseBreakpointMinimumInvestmentRequiredAmount 100,000
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

Under normal circumstances, the fund invests at least 80% of its net assets
(plus the amount of any borrowing for investment purposes) in municipal fixed
income investments, the income from which is exempt from regular federal income
taxes. The fund invests principally in investment grade municipal bonds of
varying maturities. Normally, the fund limits its investments in municipal bonds
that are subject to the federal alternative minimum tax (AMT) so that not more
than 25% of its interest income will be subject to the AMT, and invests in these
bonds when its investment advisor believes that they offer attractive yields
relative to similar municipal bonds that are not subject to the AMT.

The fund normally limits its portfolio "duration" to between three and seven
years. Duration is a measure of the fund's exposure to interest rate risk-a
longer duration means that changes in market interest rates are likely to have a
larger effect on the value of the fund's portfolio.

The fund may invest up to 50% of its total assets in municipal bonds that are
secured by revenues from public housing authorities and state and local housing
finance authorities, including bonds that are secured or backed by the US
Treasury or other US government guaranteed securities. There are different types
of US government securities, including those issued or guaranteed by the US
government, its agencies and its instrumentalities, and they have different
types of government support. Some are supported by the full faith and credit of
the US, while others are supported by (1) the ability of the issuer to borrow
from the US Treasury; (2) the credit of the issuing agency, instrumentality or
government-sponsored entity; (3) pools of assets, such as mortgages; or (4) the
US government in some other way.

The fund limits its investments in municipal bonds with the lowest investment
grade rating (or unrated bonds of equivalent quality) to 15% of its total assets
at the time the bonds are purchased.

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. Standish Mellon Asset Management Company LLC ("Standish")
currently serves as the fund's investment advisor. In deciding which securities
to buy for the fund, Standish seeks to identify undervalued sectors or
geographical regions of the municipal market or undervalued individual
securities, by using credit research and valuation analysis and monitoring the
relationship of the municipal yield curve to the treasury yield curve. Standish
also uses credit quality assessments from its in-house analysts to identify
potential rating changes, undervalued issues and macro trends with regard to
market sectors and geographical regions. Standish may make modest duration
adjustments based on economic analyses and interest rate forecasts. Standish
generally sells securities (1) if it identifies more attractive investment
opportunities within its investment criteria; (2) with weakening credit
profiles; or (3) to adjust the average duration of the fund's portfolio.
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:

Interest rate risk: An increase in prevailing interest rates typically causes
the value of fixed income securities to fall. Changes in interest rates will
likely affect the value of longer-duration fixed income securities more than
shorter-duration securities and higher quality securities more than lower
quality securities. When interest rates are falling, some fixed income
securities provide that the issuer may repay them earlier than the maturity
date, and if this occurs the fund may have to reinvest these repayments at lower
interest rates.

Municipal securities risk: Municipal securities are subject to interest rate and
credit risks. The ability of a municipal issuer to make payments and the value
of municipal securities can be affected by uncertainties in the municipal
securities market. Such uncertainties could cause increased volatility in the
municipal securities market and could negatively impact the fund's net asset
value and/or the distributions paid by the fund. Municipalities continue to
experience difficulties in the current economic and political environment.

Credit risk: The risk that the fund could lose money if the issuer or guarantor
of a fixed income security, or the counterparty to or guarantor of a derivative
contract, is unable or unwilling to meet its financial obligations. This risk is
likely greater for lower quality investments than for investments that are
higher quality.

Related securities concentration risk: Because the fund may invest more than 25%
of its total assets in municipal bonds that are issued to finance similar
projects, changes that affect one type of municipal bond may have a significant
impact on the value of the fund.

US Government securities risk: There are different types of US government
securities with different levels of credit risk, including the risk of default,
depending on the nature of the particular government support for that security.
For example, a US government-sponsored entity, such as Federal National Mortgage
Association ("Fannie Mae") or Federal Home Loan Mortgage Corporation ("Freddie
Mac"), although chartered or sponsored by an Act of Congress, may issue
securities that are neither insured nor guaranteed by the US Treasury and are
therefore riskier than those that are.

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.

Illiquidity risk: The risk that investments cannot be readily sold at the
desired time or price, and the fund may have to accept a lower price or may not
be able to sell the security at all. An inability to sell securities can
adversely affect the fund's value or prevent the fund from taking advantage of
other investment opportunities.

Management risk: The risk that the investment strategies, techniques and risk
analyses employed by the 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. 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 Municipal Fixed Income 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: 6.57%
Best quarter during calendar years shown-3Q 2009: 5.93%
Worst quarter during calendar years shown-4Q 2010: (3.31)%
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 Municipal Fixed Income Investments (First Prospectus Summary) | PACE Municipal Fixed Income Investments | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2012-11-28
PACE Municipal Fixed Income Investments (First Prospectus Summary) | PACE Municipal Fixed Income Investments | Class B
  
Risk/Return: rr_RiskReturnAbstract  
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2012-11-28
PACE Municipal Fixed Income Investments (First Prospectus Summary) | PACE Municipal Fixed Income 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 6.57%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter during calendar years shown-3Q 2009:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 5.93%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter during calendar years shown-4Q 2010:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2010
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (3.31%)
PACE Municipal Fixed Income Investments (First Prospectus Summary) | PACE Municipal Fixed Income Investments | Class Y
  
Risk/Return: rr_RiskReturnAbstract  
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2012-11-28
PACE Municipal Fixed Income Investments | Barclays Capital US Municipal 3-15 Year Blend Index
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Barclays Capital US Municipal 3-15 Year Blend Index (Index reflects no deduction for fees, expenses or taxes.)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 3.13%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.67%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.93%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception    [2],[3]
PACE Municipal Fixed Income Investments | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Maximum front-end sales charge (load) imposed on purchases (as a % of the offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.50%
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 0.44%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses (includes administration fee of 0.10%) rr_OtherExpensesOverAssets 0.25%
Total annual fund operating expenses rr_ExpensesOverAssets 0.94%
Management fee waiver/expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.01%) [4]
Total annual fund operating expenses after fee waiver and/or expense reimbursements rr_NetExpensesOverAssets 0.93% [4]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 541
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 735
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 946
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,552
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class A Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (2.17%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.62%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10   
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.03% [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jan. 23, 2001
PACE Municipal Fixed Income 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 0.44%
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 1.75%
Management fee waiver/expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.07%) [4]
Total annual fund operating expenses after fee waiver and/or expense reimbursements rr_NetExpensesOverAssets 1.68% [4]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 671
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 844
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,142
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,645 [5]
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 171
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 544
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 942
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,645 [5]
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class B Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (3.28%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.43%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10   
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.04% [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 23, 2001
PACE Municipal Fixed Income 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 0.75%
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 0.44%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Other expenses (includes administration fee of 0.10%) rr_OtherExpensesOverAssets 0.26%
Total annual fund operating expenses rr_ExpensesOverAssets 1.45%
Management fee waiver/expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.02%) [4]
Total annual fund operating expenses after fee waiver and/or expense reimbursements rr_NetExpensesOverAssets 1.43% [4]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 221
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 457
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 790
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,734
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 146
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 457
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 790
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,734
Annual Return 2001 rr_AnnualReturn2001 4.00%
Annual Return 2002 rr_AnnualReturn2002 6.98%
Annual Return 2003 rr_AnnualReturn2003 2.68%
Annual Return 2004 rr_AnnualReturn2004 1.53%
Annual Return 2005 rr_AnnualReturn2005 0.34%
Annual Return 2006 rr_AnnualReturn2006 2.47%
Annual Return 2007 rr_AnnualReturn2007 2.65%
Annual Return 2008 rr_AnnualReturn2008 (0.90%)
Annual Return 2009 rr_AnnualReturn2009 9.31%
Annual Return 2010 rr_AnnualReturn2010 1.96%
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class C Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.21%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.04%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.06%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception    [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 04, 2000
PACE Municipal Fixed Income 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 1.21%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.04%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.06%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception    [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 04, 2000
PACE Municipal Fixed Income 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 1.68%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.00%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.04%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception    [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 04, 2000
PACE Municipal Fixed Income 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 0.44%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (includes administration fee of 0.10%) rr_OtherExpensesOverAssets 0.30%
Total annual fund operating expenses rr_ExpensesOverAssets 0.74%
Management fee waiver/expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.06%) [4]
Total annual fund operating expenses after fee waiver and/or expense reimbursements rr_NetExpensesOverAssets 0.68% [4]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 69
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 231
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 406
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 913
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class Y Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 2.80%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.83%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10   
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.77% [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 23, 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 returns for the Barclays Capital US Municipal 3-15 Year Blend Index for the life of the following classes were: Class A-4.81%; Class B-4.85%; Class Y-4.85%.
[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 0.93% for Class A, 1.68% for Class B, 1.43% for Class C and 0.68% 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.