Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Nov. 28, 2011
PACE High Yield Investments (Second 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.
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 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. 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 maximum annual PACE Select Advisors Program fee; 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://globalamus.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.
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://globalamus.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 P Shares (2007 was Class P’s first full calendar year of operations)
Bar Chart, Does Not Reflect Sales Loads	rr_BarChartDoesNotReflectSalesLoads	The bar chart does not reflect the maximum annual PACE Select Advisors Program fee; if it did, the total returns shown would be lower.
Bar Chart, Closing	rr_BarChartClosingTextBlock	Total return January 1 - September 30, 2011: (4.75)% Best quarter during calendar years shown-2nd Q 2009: 20.77% Worst quarter during calendar years shown-4th Q 2008: (12.52)%
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.
Average Annual Returns, Caption	rr_AverageAnnualReturnCaption	Average annual total returns (for the periods ended December 31, 2010)
PACE High Yield Investments (Second Prospectus Summary) | PACE High Yield Investments | Class P
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	(4.75%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter during calendar years shown-2nd Q 2009:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	20.77%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter during calendar years shown-4th Q 2008:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(12.52%)
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	8.95%
PACE High Yield Investments | Class P
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 offering price)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Redemption fee (as a % of the amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Maximum annual account fee for PACE Select Advisors Program (as a % of average value of shares held on the last calendar day of the previous quarter)	rr_MaximumAccountFeeOverAssets	2.00%
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	0.45%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.15%
Management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.05%)	[2]
Total annual fund operating expenses after fee waiver and/or expense reimbursements	rr_NetExpensesOverAssets	1.10%	[2]
Expense Example, With Redemption, 1 Year	rr_ExpenseExampleYear01	313
Expense Example, With Redemption, 3 Years	rr_ExpenseExampleYear03	967
Expense Example, With Redemption, 5 Years	rr_ExpenseExampleYear05	1,645
Expense Example, With Redemption, 10 Years	rr_ExpenseExampleYear10	3,454
Annual Return 2007	rr_AnnualReturn2007	1.36%
Annual Return 2008	rr_AnnualReturn2008	(18.53%)
Annual Return 2009	rr_AnnualReturn2009	50.86%
Annual Return 2010	rr_AnnualReturn2010	15.28%
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Class P Return before taxes
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	12.99%
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	7.18%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Apr. 10, 2006
PACE High Yield Investments | Class P | After Taxes on Distributions
Risk/Return:	rr_RiskReturnAbstract
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Class P Return after taxes on distributions
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	9.99%
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	4.35%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Apr. 10, 2006
PACE High Yield Investments | Class P | After Taxes on Distributions and Sales
Risk/Return:	rr_RiskReturnAbstract
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Class P Return after taxes on distributions and sale of fund shares
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	8.46%
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	4.40%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Apr. 10, 2006

[1] Except that the expenses reflect the effects of the fund's fee waiver/expense reimbursement agreement for the first year only.

[2] 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 through November 28, 2012 (excluding dividend expense, borrowing costs, and interest expense relating to short sales, and expenses attributable to investment in other investment companies, interest, taxes, brokerage commissions and extraordinary expenses) would not exceed 1.10%. 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 this expense cap. 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.