Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Nov. 28, 2011
PACE Large Co Growth Equity Investments (First Prospectus Summary) | PACE Large Co Growth Equity Investments
Risk/Return:	rr_RiskReturnAbstract
Risk/Return, Heading	rr_RiskReturnHeading	PACE Large Co Growth Equity Investments
Investment Objective, Heading	rr_ObjectiveHeading	Investment objective
investment Objective, Primary	rr_ObjectivePrimaryTextBlock	Capital appreciation.
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 $50,000 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 84% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	84.00%
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 $50,000 in the UBS family of funds.
Expense Breakpoint, Minimum Investment Required Amount	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	50,000
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 invests primarily in stocks of companies that are believed to have substantial potential for capital growth. Under normal circumstances, the fund invests at least 80% of its net assets (plus the amount of any borrowing for investment purposes) in equity securities issued by large capitalization companies (that is, companies with a total market capitalization of $3.0 billion or greater at the time of purchase). Dividend income is an incidental consideration in the investment advisors' selection of stocks for the fund. The fund may from time to time invest a significant portion of its assets in the stocks of companies in various economic sectors, such as healthcare or technology. The fund may also invest, to a lesser extent, in other securities such as securities convertible into stocks, fixed income securities, initial public offerings and stocks of companies with smaller total market capitalizations. The fund may invest up to 20% of its total assets in non-US securities, which may trade either within or outside the US. The fund may use forward currency contracts, options, futures, swaps and other derivatives as part of its investment strategy or to help manage portfolio risks. 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. Marsico Capital Management, LLC ("Marsico"), Wellington Management Company, LLP ("Wellington Management"), Delaware Management Company ("Delaware") and Roxbury Capital Management, LLC ("Roxbury") currently serve as the fund's investment advisors. The relative value of each investment advisor's share of the fund's assets may change over time. Marsico's investment strategy combines "top-down" macro-economic analysis with "bottom-up" stock selection. The top-down analysis seeks to identify sectors, industries and companies that may benefit from overall trends Marsico has observed. Marsico then applies the bottom-up stock selection to locate individual companies or securities with earnings growth potential that may not be recognized by the market at large. Wellington Management's strategy seeks long-term total returns above the Russell 1000 Growth Index by investing in companies that it believes are well positioned to benefit from long-lasting trends and have structural advantages to maintaining their position. It applies in-depth fundamental research seeking to identify change early, differentiate sustainable growth opportunities from short-lived events, identify superior business models, and develop strict valuation parameters for the companies they evaluate. Delaware invests primarily in common stocks of large capitalization growth-oriented companies that Delaware believes have long-term capital appreciation potential and are expected to grow faster than the US economy. It uses a bottom-up approach, seeking companies that have large-end market potential, dominant business models and strong free cash flow generation that are attractively priced compared to the intrinsic value of the securities. Delaware tends to hold a relatively focused portfolio with a limited number of stocks. Roxbury's strategy employs a bottom-up approach to stock selection, seeking high quality growth companies whose stocks are trading at discounts to fair value. Roxbury looks for companies with sustainable competitive advantages and opportunities to grow and reinvest capital at higher rates than their cost of capital, as well as companies with management teams with a proven ability to maximize shareholder value. Roxbury evaluates companies as private entities to determine their intrinsic worth and uses scenario analysis to determine a "margin of safety," or discount to intrinsic value, as a means of protecting capital. Roxbury typically sells a stock if (1) the market price exceeds Roxbury's estimate of intrinsic value; (2) the company's fundamentals fall short of Roxbury's investment thesis; or (3) when there are more attractive investment alternatives. Roxbury may invest in a limited number of stocks that it believes have attractive risk-reward profiles, and this may also result in significant weights in a sector.
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: Equity risk: Stocks and other equity securities, and securities convertible into stocks, generally fluctuate in value more than bonds. The fund could lose all of its investment in a company's stock. Sector risk: Because the fund may invest a significant portion of its assets in the stocks of companies in particular economic sectors, economic changes adversely affecting such a sector may have more of an impact on the fund's performance than another fund having a broader range of investments. 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. 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. In addition, many types of swaps and 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. 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. 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. 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. 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. Initial public offerings 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. Management risk: The risk that the investment strategies, techniques and risk analyses employed by an 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. This may be particularly true given that other investment advisors were responsible for managing portions of the fund's assets during previous periods. Marsico assumed responsibility for managing a separate portion of the fund's assets on September 16, 2002. Wellington Management assumed responsibility for managing a separate portion of the fund's assets on June 1, 2007. Delaware assumed responsibility for managing a separate portion of the fund's assets on December 5, 2007. Roxbury assumed responsibility for managing a separate portion of the fund's assets on May 25, 2010. 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 Large Co Growth Equity 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: (10.79)% Best quarter during calendar years shown-4Q 2001: 15.67% Worst quarter during calendar years shown-1Q 2001: (23.14)%
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 Large Co Growth Equity Investments (First Prospectus Summary) | PACE Large Co Growth Equity Investments | Class A
Risk/Return:	rr_RiskReturnAbstract
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2012-11-28
PACE Large Co Growth Equity Investments (First Prospectus Summary) | PACE Large Co Growth Equity Investments | Class B
Risk/Return:	rr_RiskReturnAbstract
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2012-11-28
PACE Large Co Growth Equity Investments (First Prospectus Summary) | PACE Large Co Growth Equity 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	(10.79%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter during calendar years shown-4Q 2001:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Dec. 31, 2001
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	15.67%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter during calendar years shown-1Q 2001:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Mar. 31, 2001
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(23.14%)
PACE Large Co Growth Equity Investments (First Prospectus Summary) | PACE Large Co Growth Equity Investments | Class Y
Risk/Return:	rr_RiskReturnAbstract
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2012-11-28
PACE Large Co Growth Equity Investments | Russell 1000 Growth Index
Risk/Return:	rr_RiskReturnAbstract
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Russell 1000 Growth Index (Index reflects no deduction for fees, expenses or taxes.)
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	16.71%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	3.75%
Average Annual Returns, 10 Years	rr_AverageAnnualReturnYear10	0.02%
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	(0.03%)	[2],[3]
PACE Large Co Growth Equity Investments | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum front-end sales charge (load) imposed on purchases (as a % of the offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.50%
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	0.68%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses (includes administration fee of 0.10%)	rr_OtherExpensesOverAssets	0.30%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.23%
Management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets		[4]
Total annual fund operating expenses after fee waiver and/or expense reimbursements	rr_NetExpensesOverAssets	1.23%	[4]
Expense Example, With Redemption, 1 Year	rr_ExpenseExampleYear01	668
Expense Example, With Redemption, 3 Years	rr_ExpenseExampleYear03	919
Expense Example, With Redemption, 5 Years	rr_ExpenseExampleYear05	1,188
Expense Example, With Redemption, 10 Years	rr_ExpenseExampleYear10	1,957
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Class A Return before taxes
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	9.82%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	1.48%
Average Annual Returns, 10 Years	rr_AverageAnnualReturnYear10	(1.50%)
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception		[2]
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 27, 2000
PACE Large Co Growth Equity 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	0.68%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses (includes administration fee of 0.10%)	rr_OtherExpensesOverAssets	0.66%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.34%
Management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.29%)	[4]
Total annual fund operating expenses after fee waiver and/or expense reimbursements	rr_NetExpensesOverAssets	2.05%	[4]
Expense Example, With Redemption, 1 Year	rr_ExpenseExampleYear01	708
Expense Example, With Redemption, 3 Years	rr_ExpenseExampleYear03	1,003
Expense Example, With Redemption, 5 Years	rr_ExpenseExampleYear05	1,424
Expense Example, With Redemption, 10 Years	rr_ExpenseExampleYear10	2,118	[5]
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	208
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	703
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,224
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,118	[5]
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Class B Return before taxes
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	10.28%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	1.42%
Average Annual Returns, 10 Years	rr_AverageAnnualReturnYear10	(1.42%)
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception		[2]
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 27, 2000
PACE Large Co Growth Equity 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	1.00%
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	0.68%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses (includes administration fee of 0.10%)	rr_OtherExpensesOverAssets	0.39%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.07%
Management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.02%)	[4]
Total annual fund operating expenses after fee waiver and/or expense reimbursements	rr_NetExpensesOverAssets	2.05%	[4]
Expense Example, With Redemption, 1 Year	rr_ExpenseExampleYear01	308
Expense Example, With Redemption, 3 Years	rr_ExpenseExampleYear03	647
Expense Example, With Redemption, 5 Years	rr_ExpenseExampleYear05	1,112
Expense Example, With Redemption, 10 Years	rr_ExpenseExampleYear10	2,398
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	208
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	647
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,112
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,398
Annual Return 2001	rr_AnnualReturn2001	(22.10%)
Annual Return 2002	rr_AnnualReturn2002	(31.36%)
Annual Return 2003	rr_AnnualReturn2003	28.17%
Annual Return 2004	rr_AnnualReturn2004	7.67%
Annual Return 2005	rr_AnnualReturn2005	4.23%
Annual Return 2006	rr_AnnualReturn2006	8.18%
Annual Return 2007	rr_AnnualReturn2007	10.92%
Annual Return 2008	rr_AnnualReturn2008	(40.28%)
Annual Return 2009	rr_AnnualReturn2009	32.34%
Annual Return 2010	rr_AnnualReturn2010	15.24%
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Class C Return before taxes
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	14.24%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	1.79%
Average Annual Returns, 10 Years	rr_AverageAnnualReturnYear10	(1.72%)
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception		[2]
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 27, 2000
PACE Large Co Growth Equity 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	14.24%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	1.69%
Average Annual Returns, 10 Years	rr_AverageAnnualReturnYear10	(1.77%)
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception		[2]
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 27, 2000
PACE Large Co Growth Equity 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	9.26%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	1.53%
Average Annual Returns, 10 Years	rr_AverageAnnualReturnYear10	(1.45%)
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception		[2]
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 27, 2000
PACE Large Co Growth Equity 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	0.68%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses (includes administration fee of 0.10%)	rr_OtherExpensesOverAssets	0.31%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.99%
Management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets		[4]
Total annual fund operating expenses after fee waiver and/or expense reimbursements	rr_NetExpensesOverAssets	0.99%	[4]
Expense Example, With Redemption, 1 Year	rr_ExpenseExampleYear01	101
Expense Example, With Redemption, 3 Years	rr_ExpenseExampleYear03	315
Expense Example, With Redemption, 5 Years	rr_ExpenseExampleYear05	547
Expense Example, With Redemption, 10 Years	rr_ExpenseExampleYear10	1,213
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Class Y Return before taxes
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	16.54%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	3.02%
Average Annual Returns, 10 Years	rr_AverageAnnualReturnYear10
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	(0.50%)	[2]
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 15, 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 return for the Russell 1000 Growth Index for the life of Class Y shares.

[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 1.30% for Class A, 2.05% for Class B, 2.05% for Class C and 1.05% 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.