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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
ProspectusDate rr_ProspectusDate Nov. 28, 2011
PACE High Yield Investments (First Prospectus Summary) | PACE High Yield Investments
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading PACE High Yield Investments
Investment Objective, Heading rr_ObjectiveHeading Investment objective
investment Objective, Primary rr_ObjectivePrimaryTextBlock 
Total return.
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 36%
of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 36.00%
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

The fund seeks to achieve its objective by investing primarily in a
professionally managed, diversified portfolio of fixed income securities rated
below investment grade. Under normal circumstances, the fund invests at least
80% of its net assets (plus the amount of any borrowing for investment purposes)
in high yield fixed income securities that are rated below investment grade or
considered to be of comparable quality (commonly referred to as "junk bonds").

These investments will include fixed income securities that are (1) rated below
investment grade (lower than a Baa rating by Moody's Investors Service, Inc.
("Moody's") or lower than a BBB rating by Standard and Poor's, a division of The
McGraw Hill Companies Inc. ("S&P")); (2) comparably rated by another nationally
recognized statistical rating organization (collectively, with Moody's and S&P,
"Rating Agencies"); or (3) unrated, but deemed by the fund's investment advisor
to be of comparable quality to fixed income securities rated below Baa, BBB or a
comparable rating by a Rating Agency.

The fund may invest up to 10% of its total assets in US and/or non-US senior
secured bank loans (each of which may be denominated in foreign currencies),
which may be in the form of loan participations and assignments. The fund may
invest in a number of different countries throughout the world, including the
US. The fund may (but is not required to) use interest rate futures contracts
(specifically, those for which US Treasury securities are the underlying assets)
in managing its exposure to changes in interest rates.

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. MacKay Shields LLC ("MacKay Shields") currently serves as the
fund's investment advisor. MacKay Shields attempts to deliver attractive risk
adjusted returns by avoiding most of the unusually large losses in the high
yield market, even if it means giving up much of the large potential gains.
MacKay Shields believes that there is a very small subset of bonds that delivers
outsized gains in the market. Due to the limited upside inherent in most bonds,
over time, outsized gains are expected to be smaller than unusually large
losses. By attempting to limit the fund's participation in the extremes of the
market, MacKay Shields strives to add value over a market cycle and with lower
volatility through a rigorous process that attempts to screen out what it
believes to be the riskiest issuers in the market. MacKay Shields anticipates
that under normal circumstances the fund's average duration will be within +/-
25% of that of the BofA Merrill Lynch Global High Yield Index. This index
ordinarily has a duration of between 4 and 5 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 has no average targeted portfolio maturity.
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:

High yield securities ("junk bonds") risk: Lower-rated securities (the issuers
of which are typically in poor financial health) are subject to higher risks
than investment grade securities. For example, lower-rated securities may be (1)
subject to a greater risk of loss of principal and non-payment of interest
(including default by the issuer); (2) subject to greater price volatility; and
(3) less liquid than investment grade securities. The prices of such securities
may be more vulnerable to bad economic news, or even the expectation of bad
news, than higher rated fixed income securities.

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.

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.

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.

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.

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.

Valuation risk: During periods of reduced market liquidity or in the absence of
readily available market quotations, the ability of the fund to value the fund's
securities becomes more difficult and the judgment of the fund's manager and
investment advisor may play a greater role in the valuation of the securities
due to reduced availability of reliable objective pricing data.

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

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. Derivatives relating to fixed income
markets are especially susceptible to interest rate risk and credit risk. These
derivatives risks are different from, and may be greater than, the risks
associated with investing directly in securities and other instruments.

Loan investments risk: In addition to those risks typically associated with
investments in debt securities, investments in bank loans are subject to the
risk that the collateral securing a loan may not provide sufficient protection
to the fund. With respect to participations in loans, the fund's contractual
relationship is typically with the lender (rather than the borrower).
Consequently, the fund may have limited rights of enforcement against the
borrower and assumes the credit risk of both the lender and the borrower.
Investments in bank loans may be relatively illiquid, which could adversely
affect the value of these investments and the fund's ability to dispose of them.
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 A 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. Class B share performance is not provided because during the fund's
prior fiscal year, Class B shares were not operational. 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 A shares' after-tax returns shown.
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 High Yield Investments Annual Total Returns of Class A Shares (2007 was Class A’s first full calendar year of operations)
Bar Chart, Does Not Reflect Sales Loads rr_BarChartDoesNotReflectSalesLoads The bar chart does not reflect the sales charges of the fund's Class A shares; if it did, the total returns shown would be lower.
Bar Chart, Closing rr_BarChartClosingTextBlock 
Total return January 1 - September 30, 2011: (4.91)%
Best quarter during calendar years shown-2Q 2009: 20.87%
Worst quarter during calendar years shown-4Q 2008: (12.47)%
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 A shares' after-tax returns shown.
Average Annual Returns, Caption rr_AverageAnnualReturnCaption Average annual total returns (for the periods ended December 31, 2010)
PACE High Yield Investments (First Prospectus Summary) | PACE High Yield Investments | Class A
  
Risk/Return: rr_RiskReturnAbstract  
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 (4.91%)
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 20.87%
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 (12.47%)
PACE High Yield Investments | BofA Merrill Lynch Global High Yield Index (hedged in USD)
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel BofA Merrill Lynch Global High Yield Index (hedged in USD) (Index reflects no deduction for fees, expenses or taxes.)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 15.39%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception    [2]
PACE High Yield 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 0.70%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses (includes administration fee of 0.10%) rr_OtherExpensesOverAssets 0.36%
Total annual fund operating expenses rr_ExpensesOverAssets 1.31%
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 577
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 847
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,136
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,958
Annual Return 2007 rr_AnnualReturn2007 1.22%
Annual Return 2008 rr_AnnualReturn2008 (18.72%)
Annual Return 2009 rr_AnnualReturn2009 50.39%
Annual Return 2010 rr_AnnualReturn2010 14.94%
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class A Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 9.72%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 8.03%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2006
PACE High Yield Investments | Class A | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class A Return after taxes on distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 6.88%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 5.25%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2006
PACE High Yield Investments | Class A | After Taxes on Distributions and Sales
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class A Return after taxes on distributions and sale of fund shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 6.32%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 5.14%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2006
PACE High Yield Investments | Class B
  
Risk/Return: rr_RiskReturnAbstract  
Maximum front-end sales charge (load) imposed on purchases (as a % of the offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a % of the lesser of the offering price or the redemption price) rr_MaximumDeferredSalesChargeOverOfferingPrice 5.00%
Redemption fee (as a % of the amount redeemed within 90 days of purchase, if applicable) rr_RedemptionFeeOverRedemption (1.00%)
Exchange fee rr_ExchangeFee none
Management fees rr_ManagementFeesOverAssets 0.70% [3]
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00% [3]
Other expenses (includes administration fee of 0.10%) rr_OtherExpensesOverAssets 0.32% [3]
Total annual fund operating expenses rr_ExpensesOverAssets 2.02% [3]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 705
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 934
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,288
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,998 [4]
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 205
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 634
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,088
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,998 [4]
PACE High Yield 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 0.70%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Other expenses (includes administration fee of 0.10%) rr_OtherExpensesOverAssets 0.32%
Total annual fund operating expenses rr_ExpensesOverAssets 1.77%
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 255
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 557
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 959
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,084
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 180
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 557
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 959
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,084
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class C Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 13.68%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 28.84%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jan. 21, 2009
PACE High Yield Investments | Class Y
  
Risk/Return: rr_RiskReturnAbstract  
Maximum front-end sales charge (load) imposed on purchases (as a % of the offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a % of the lesser of the offering price or the redemption price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee (as a % of the amount redeemed within 90 days of purchase, if applicable) rr_RedemptionFeeOverRedemption (1.00%)
Exchange fee rr_ExchangeFee none
Management fees rr_ManagementFeesOverAssets 0.70%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (includes administration fee of 0.10%) rr_OtherExpensesOverAssets 0.33%
Total annual fund operating expenses rr_ExpensesOverAssets 1.03%
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 105
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 328
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 569
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,259
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class Y Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 15.29%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 34.69%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 26, 2008
[1] Except that the expenses reflect the effects of the fund's fee waiver/expense reimbursement agreement for the first year only.
[2] Average annual total returns for the BofA Merrill Lynch Global High Yield Index (hedged in USD) for the life of each class were as follows: Class A-8.88%; Class C-33.98%; Class Y-38.44%.
[3] During the fund's prior fiscal year, Class B shares were not operational. Therefore, these amounts have been estimated and may be higher or lower if the class of shares becomes operational.
[4] Reflects conversion to Class A shares after a maximum of 6 years.