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Risk/Return: rr_RiskReturnAbstract  
Entity Central Index Key dei_EntityCentralIndexKey 0000809593
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

American Beacon Small Cap Index FundSM

Objective [Heading] rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Fund's investment objective is to match the performance of the Russell 2000® Index (the “Russell 2000”) as closely as possible before the deduction of Fund expenses.

Expense [Heading] rr_ExpenseHeading

Fees and Expenses of the Fund

Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.
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, 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. The Fund invests all of its investable assets in the Master Small Cap Index Series of the Quantitative Master Series LLC, therefore, the portfolio turnover rate is that of the Master Small Cap Index Series. During the most recent fiscal year, the Fund's portfolio turnover rate was 22% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 22.00%
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:
Strategy [Heading] rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund seeks to achieve its investment objective by investing substantially all of its investable assets in the Small Cap Index Series (“Portfolio”) of the Quantitative Master Series LLC (“Index LLC”). The discussion below refers to investments made by the Portfolio. For easier reading, in this Prospectus, the term “Fund” includes the Portfolio.

 

The Portfolio will not attempt to buy or sell securities based on the economic, financial or market analysis of BlackRock Advisors, LLC, the Portfolio's investment adviser or BlackRock Investment Management, LLC, the Portfolio's sub-adviser (collectively, the “Adviser”), but will instead employ a “passive” investment approach. This means that the Adviser will attempt to invest in a portfolio of assets whose performance is expected to match approximately the performance of the Russell 2000 Index (“Russell 2000”) before deduction of expenses. The Portfolio will buy or sell securities only when the Adviser believes it is necessary to do so in order to match the performance of the Russell 2000. Accordingly, it is anticipated that the Portfolio's portfolio turnover and trading costs will be lower than those of an “actively” managed fund. However, the Portfolio has operating and other expenses, while an index does not. Therefore, the Portfolio may tend to underperform Russell 2000 to some degree over time.

 

The Portfolio will be substantially invested in securities in the Russell 2000, and will invest, under normal circumstances, at least 80% of its assets in securities or other financial instruments that are components of or have economic characteristics similar to the securities included in the Russell 2000.

 

The Russell 2000 is composed of the common stocks of approximately the 1,001st through 3,000th largest U.S. companies by market capitalization, as determined by the Frank Russell Company. The stocks represented in the index are issued by small-capitalization U.S. companies in a wide range of businesses. As of March 31, 2014, the largest stock in the index had a market capitalization of approximately $10.6 billion, the smallest stock had a market capitalization of approximately $18 million and the dollar-weighted average market capitalization of stocks in the index was approximately $1.5 billion. The Russell 2000 is a market-weighted index, which means that the largest stocks represented in the index have the most effect on the index's performance. The Russell 2000 is generally considered broadly representative of the performance of publicly traded U.S. smaller-capitalization stocks. Frank Russell Company's selection of a stock for the Russell 2000 does not mean that the Frank Russell Company believes the stock to be an attractive investment. The Frank Russell Company updates the Russell 2000 once each year, at which time there may be substantial changes in the composition of the index (and consequently, significant turnover in the Portfolio). Stocks of companies that merge, are acquired or otherwise cease to exist during the year are not replaced in the index.

 

The Portfolio may not invest in all of the common stocks in the Russell 2000, or in the same weightings as in the Russell 2000. Instead, the Portfolio might invest in a sample of the stocks included in the Russell 2000 based on the Adviser's optimization process, a statistical sampling technique that aims to create a portfolio that will match approximately the performance of the index with fewer transaction costs than would be incurred through full replication. The Portfolio will choose investments so that the market capitalizations, industry weightings and other fundamental characteristics of the stocks and derivative instruments in its portfolio are similar to the Russell 2000 as a whole.

Risk [Heading] rr_RiskHeading

Principal Risks

Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

There is no assurance that the Fund will achieve its investment objective and you could lose part or all of your investment in the Fund. The Fund is not designed for investors who need an assured level of income and is intended to be a long-term investment. The Fund is not a complete investment program and may not be appropriate for all investors. Investors should carefully consider their own investment goals and risk tolerance before investing in the Fund.

 

The discussion below refers to the principal risks associated with an investment in the Portfolio. Because the Fund invests substantially all of its assets in the Portfolio, the principal risks associated with an investment in the Portfolio are the same as those associated with an investment in the Fund. The principal risks of investing in the Portfolio are:

 

Equity Securities Risk

Common and preferred stocks represent equity ownership in a company. Stock markets are volatile. The price of equity securities will fluctuate and can decline and reduce the value of a portfolio investing in equities. The value of equity securities purchased by the Portfolio could decline if the financial condition of the companies the Portfolio invests in declines or if overall market and economic conditions deteriorate. The value of equity securities may also decline due to factors that affect a particular industry or industries, such as labor shortages or an increase in production costs and competitive conditions within an industry. In addition, the value may decline due to general market conditions that are not specifically related to a company or industry, such as real or perceived adverse economic conditions, changes in the general outlook for corporate earnings, changes in interest or currency rates or generally adverse investor sentiment.

 

Index Fund Risk

An index fund has operating and other expenses while an index does not. As a result, while the Portfolio will attempt to track the applicable index as closely as possible, it will tend to underperform the index to some degree over time. If an index fund is properly correlated to its stated index, the fund will perform poorly when the index performs poorly.

 

Investment Risk

An investment in the Fund is not a deposit with a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. When you sell your shares of the Fund, they could be worth less than what you paid for them. Therefore, you may lose money by investing in the Fund.

 

Market Risk and Selection Risk

Market risk is the risk that one or more markets in which the Portfolio invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Portfolio management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.

 

Master/Feeder Structure Risk

Unlike a traditional mutual fund that invests directly in securities, the Fund pursues its objective by investing substantially all of its assets in the Portfolio, which has substantially the same investment objectives, policies and restrictions. The ability of the Fund to meet its investment objective is directly related to the ability of the Portfolio to meet its objective. The ability of the Fund to meet its objective may be adversely affected by the purchase and redemption activities of other investors in the corresponding Portfolio. The ability of the Fund to meet redemption requests depends on its ability to redeem its interest in the Portfolio.

 

Small Capitalization Securities Risk

Small capitalization companies may have limited product lines or markets. They may be less financially secure than larger, more established companies. They may depend on a small number of key personnel. If a product fails or there are other adverse developments, or if management changes, the Portfolio's investment in a small cap company may lose substantial value. In addition, it is more difficult to get information on smaller companies, which tend to be less well known, have shorter operating histories, do not have significant ownership by large investors and are followed by relatively few securities analysts.

 

The securities of small capitalization companies generally trade in lower volumes and are subject to greater and more unpredictable price changes than larger capitalization securities or the market as a whole. In addition, small capitalization securities may be particularly sensitive to changes in interest rates, borrowing costs and earnings. Investing in small capitalization securities requires a longer term view.  
Risk Lose Money [Text] rr_RiskLoseMoney There is no assurance that the Fund will achieve its investment objective and you could lose part or all of your investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Fund is not a deposit with 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

Fund Performance

Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart and table below provide an indication of risk by showing how the Fund's performance has varied from year to year. The table shows how the Fund's performance compares to a broad-based market index. You may obtain updated performance information on the Fund's website at www.americanbeaconfunds.com. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.

Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table below provide an indication of risk by showing how the Fund’s performance has varied from year to year.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.americanbeaconfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture 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

Calendar year total returns for Institutional Class shares
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Highest Quarterly Return:

20.74%

(1/1/04 through 12/31/13)

(2nd Quarter 2009)

Lowest Quarterly Return:

-25.96%

(1/1/04 through 12/31/13)

(4th Quarter 2008)

Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarterly Return:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 20.74%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarterly Return:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (25.96%)
Performance Table Heading rr_PerformanceTableHeading

Average Annual Total Returns For the periods ended December 31, 2013
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 If you hold your Fund shares through a tax-deferred arrangement, such as an IRA or a 401(k), the after-tax returns do not apply to your situation.
Russell 2000® Index
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 38.82% [1]
5 Years rr_AverageAnnualReturnYear05 20.08% [1]
10 Years rr_AverageAnnualReturnYear10 9.07% [1]
Institutional Class
  
Risk/Return: rr_RiskReturnAbstract  
Management fees rr_ManagementFeesOverAssets 0.01% [2]
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none [2]
Other expenses rr_OtherExpensesOverAssets 0.16% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.17% [2]
1 year rr_ExpenseExampleYear01 $ 17
3 years rr_ExpenseExampleYear03 54
5 years rr_ExpenseExampleYear05 95
10 years rr_ExpenseExampleYear10 $ 216
Annual Return 2004 rr_AnnualReturn2004 17.91%
Annual Return 2005 rr_AnnualReturn2005 4.51%
Annual Return 2006 rr_AnnualReturn2006 17.85%
Annual Return 2007 rr_AnnualReturn2007 (1.63%)
Annual Return 2008 rr_AnnualReturn2008 (33.58%)
Annual Return 2009 rr_AnnualReturn2009 27.21%
Annual Return 2010 rr_AnnualReturn2010 27.05%
Annual Return 2011 rr_AnnualReturn2011 (4.54%)
Annual Return 2012 rr_AnnualReturn2012 16.36%
Annual Return 2013 rr_AnnualReturn2013 39.98%
1 Year rr_AverageAnnualReturnYear01 38.98% [1]
5 Years rr_AverageAnnualReturnYear05 20.07% [1]
10 Years rr_AverageAnnualReturnYear10 9.00% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 31, 2000 [1]
Institutional Class | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 38.27% [1]
5 Years rr_AverageAnnualReturnYear05 19.71% [1]
10 Years rr_AverageAnnualReturnYear10 8.29% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 31, 2000 [1]
Institutional Class | After Taxes on Distributions and Sales
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 22.06% [1]
5 Years rr_AverageAnnualReturnYear05 16.33% [1]
10 Years rr_AverageAnnualReturnYear10 7.21% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 31, 2000 [1]
[1] 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. If you hold your Fund shares through a tax-deferred arrangement, such as an IRA or a 401(k), the after-tax returns do not apply to your situation.
[2] The fees and expenses shown in the table and the example that follows include both the expenses of the Fund and the Fund's share of the allocated expenses of the Small Cap Index Series ('Portfolio') of the Quantitative Master Series LLC.