Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Nov. 28, 2012
PACE Intermediate Fixed Income Investments (Second Prospectus Summary) | PACE Intermediate Fixed Income Investments
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	PACE Intermediate Fixed Income Investments
Objective [Heading]	rr_ObjectiveHeading	Investment objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	Current income, consistent with reasonable stability of principal.
Expense [Heading]	rr_ExpenseHeading	Fees and expenses of the fund
Expense Narrative [Text Block]	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 [Text]	rr_ShareholderFeesCaption	Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text]	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 [Text Block]	rr_PortfolioTurnoverTextBlock	The fund pays transaction costs, such as commissions or dealer spreads, 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 398% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	398.00%
Expense Example [Heading]	rr_ExpenseExampleHeading	Example
Expense Example Narrative [Text Block]	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]
Strategy [Heading]	rr_StrategyHeading	Principal strategies
Strategy Narrative [Text Block]	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 fixed income securities. Such investments may include US government and foreign government bonds (including bonds issued by supranational and quasi-governmental entities and mortgage-backed securities) and corporate bonds (including mortgage- and asset-backed securities of private issuers, Eurodollar certificates of deposit, Eurodollar bonds and Yankee bonds). 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 may invest in bonds that are investment grade at the time of purchase. The fund may also invest, in the aggregate, up to 20% of its total assets (measured at the time of purchase) in (1) bonds that are below investment grade at the time of purchase (or unrated bonds of equivalent quality) (i.e., "junk bonds"), (2) non-US dollar denominated securities, and (3) fixed income securities of issuers located in emerging markets. The fund may also invest in preferred stocks. The fund invests in bonds of varying maturities, but normally maintains a dollar-weighted average maturity of approximately three to ten years. It normally limits its overall portfolio "duration" to within +/- 30% of the duration of the Barclays US Intermediate Government/Credit Index. During the five year period ended July 31, 2012, this index's duration ranged between 3.54 and 3.89 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, but is not required to, use exchange-traded or over-the-counter derivative instruments for risk management purposes or to attempt to increase total returns. The derivatives in which the fund may invest include options (on swap agreements), futures (on securities or interest rate futures) and swap agreements (specifically, interest rate swaps). These derivatives may be used for risk management purposes, such as managing the risk profile of the fund. In addition, the derivative instruments listed above may be used to enhance returns or in place of direct investments. Interest rate futures, swaps and swaptions also be used to adjust the fund's portfolio duration. Management process The fund employs a "manager of managers" structure. UBS Global Asset Management (Americas) Inc. ("UBS Global AM"), the fund's manager and primary provider of investment advisory services, has the ultimate authority, subject to oversight by the fund's board, to oversee the fund's investment advisor(s) and recommend their hiring, termination and replacement. BlackRock Financial Management, Inc. ("BlackRock") currently serves as the fund's investment advisor. BlackRock decides to buy specific bonds for the fund based on its credit analysis and review. BlackRock seeks to add value by controlling portfolio duration within a narrow band relative to the Barclays US Intermediate Government/Credit Index. BlackRock uses an analytical process that involves evaluating macroeconomics trends, technical market factors, yield curve exposure and market volatility.
Risk [Heading]	rr_RiskHeading	Principal risks
Risk Narrative [Text Block]	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. 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. Prepayment risk: The fund's mortgage- and asset-backed securities may be prepaid more rapidly than expected, especially when interest rates are falling, and the fund may have to reinvest those prepayments at lower interest rates. When interest rates are rising, slower prepayments may extend the duration of the securities and may reduce their value. Non-diversification risk: The fund is a non-diversified investment company, which means that the fund may invest more of its assets in a smaller number of issuers than a diversified investment company. As a non-diversified fund, the fund's share price may be more volatile and the fund has a greater potential to realize losses upon the occurrence of adverse events affecting a particular issuer. 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 markets 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. 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. When using derivatives for hedging purposes, the fund's overall returns may be reduced if the hedged investment experiences a favorable price movement. 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. In addition, many types of swaps and other non-exchange traded derivatives may be subject to liquidity risk, counterparty 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. Moreover, changing market, economic and political conditions in one country or geographic region could adversely impact market, economic and political conditions in other countries or regions. 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. Portfolio turnover risk: The fund may engage in frequent trading, which can result in high portfolio turnover. A high portfolio turnover rate involves greater expenses to the fund, including transaction costs, and is likely to generate more taxable short term gains for shareholders, which may have an adverse impact on performance. 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. Swap agreement risk: The fund may enter into various types of swap agreements. Swap agreements can be less liquid and more difficult to value than other investments. Because its cash flows are based in part on changes in the value of the reference asset, a total return swap's market value will vary with changes in that reference asset. In addition, the fund may experience delays in payment or loss of income if the counterparty fails to perform under the contract. 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 [Text]	rr_RiskLoseMoney	You may lose money by investing in the fund.
Risk Nondiversified Status [Text]	rr_RiskNondiversifiedStatus	The fund is a non-diversified investment company, which means that the fund may invest more of its assets in a smaller number of issuers than a diversified investment company. As a non-diversified fund, the fund's share price may be more volatile and the fund has a greater potential to realize losses upon the occurrence of adverse events affecting a particular issuer.
Risk Not Insured Depository Institution [Text]	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 [Text Block]	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. This may be particularly true for the period prior to July 29, 2002, which is the date on which BlackRock assumed day-to-day management of the fund's assets. Prior to that date, another investment advisor was responsible for managing the fund's assets. 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.
Performance Information Illustrates Variability of Returns [Text]	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 [Text]	rr_PerformanceAvailabilityWebSiteAddress	http://globalam-us.ubs.com/corpweb/performance.do
Performance Past Does Not Indicate Future [Text]	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 Intermediate Fixed Income Investments Annual Total Returns of Class P Shares
Bar Chart Does Not Reflect Sales Loads [Text]	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 [Text Block]	rr_BarChartClosingTextBlock	Total return January 1 - September 30, 2012: 3.66% Best quarter during calendar years shown--3Q 2009: 3.91% Worst quarter during calendar years shown--3Q 2008: (3.69)%
Index No Deduction for Fees, Expenses, Taxes [Text]	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.
Caption	rr_AverageAnnualReturnCaption	Average annual total returns (for the periods ended December 31, 2011)
PACE Intermediate Fixed Income Investments (Second Prospectus Summary) | PACE Intermediate Fixed Income Investments | Barclays US Intermediate Government/Credit Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Barclays US Intermediate Government/Credit Index (Index reflects no deduction for fees, expenses or taxes.)
1 Year	rr_AverageAnnualReturnYear01	5.80%
5 Years	rr_AverageAnnualReturnYear05	5.88%
10 Years	rr_AverageAnnualReturnYear10	5.20%
PACE Intermediate Fixed Income Investments (Second Prospectus Summary) | PACE Intermediate Fixed Income Investments | Class P
Risk Return [Abstract]	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	0.43%
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	0.74%
Management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.06%)	[2]
Total annual fund operating expenses after fee waiver and/or expense reimbursements	rr_NetExpensesOverAssets	0.68%	[2]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-11-30
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	271
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	845
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,444
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	3,066
Annual Return 2002	rr_AnnualReturn2002	(0.02%)
Annual Return 2003	rr_AnnualReturn2003	4.02%
Annual Return 2004	rr_AnnualReturn2004	2.75%
Annual Return 2005	rr_AnnualReturn2005	1.33%
Annual Return 2006	rr_AnnualReturn2006	3.95%
Annual Return 2007	rr_AnnualReturn2007	7.43%
Annual Return 2008	rr_AnnualReturn2008	(1.29%)
Annual Return 2009	rr_AnnualReturn2009	9.50%
Annual Return 2010	rr_AnnualReturn2010	5.44%
Annual Return 2011	rr_AnnualReturn2011	4.59%
Year to Date Return, Label	rr_YearToDateReturnLabel	Total return January 1 - September 30, 2012:
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	3.66%
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	3.91%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter during calendar years shown-3Q 2008:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(3.69%)
Label	rr_AverageAnnualReturnLabel	Class P Return before taxes
1 Year	rr_AverageAnnualReturnYear01	2.52%
5 Years	rr_AverageAnnualReturnYear05	2.99%
10 Years	rr_AverageAnnualReturnYear10	1.67%
Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 24, 1995
PACE Intermediate Fixed Income Investments (Second Prospectus Summary) | PACE Intermediate Fixed Income Investments | Class P | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class P Return after taxes on distributions
1 Year	rr_AverageAnnualReturnYear01	1.63%
5 Years	rr_AverageAnnualReturnYear05	1.69%
10 Years	rr_AverageAnnualReturnYear10	0.35%
Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 24, 1995
PACE Intermediate Fixed Income Investments (Second Prospectus Summary) | PACE Intermediate Fixed Income Investments | Class P | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class P Return after taxes on distributions and sale of fund shares
1 Year	rr_AverageAnnualReturnYear01	1.63%
5 Years	rr_AverageAnnualReturnYear05	1.79%
10 Years	rr_AverageAnnualReturnYear10	0.63%
Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 24, 1995

[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 30, 2013 (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 0.68%. 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.