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

American Beacon Stephens Mid-Cap Growth FundSM
Objective [Heading] rr_ObjectiveHeading

Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Fund seeks long-term growth of capital.
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. You may qualify for sales discounts if you and your eligible family members invest, or agree to invest in the future, at least $50,000 in the A Class shares of the American Beacon Funds. More information about these and other discounts is available from your financial professional and in “Choosing Your Share Class” on page 35 of the Prospectus and “Additional Purchase and Sale Information for A Class Shares” on page 35 of the statement of additional information.

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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2015-04-30
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. During the most recent fiscal year, the Fund's portfolio turnover rate was 25% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 25.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales discounts if you and your eligible family members invest, or agree to invest in the future, at least $50,000 in the A Class shares of the American Beacon Funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
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:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption

Assuming no redemption of shares:
Strategy [Heading] rr_StrategyHeading

Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in equity securities of medium capitalization companies. The Fund considers a company to be a medium capitalization company if it has a market capitalization, at the time of investment, between $1 billion and the market capitalization of the largest company in the Russell Midcap® Index, which was $32.7 billion as of January 31, 2014.

 

Most of the assets of the Fund are invested in U.S. common stocks Stephens Investment Management Group, LLC (“SIMG”) believes have clear indicators of future earnings growth, or that demonstrate other potential for growth of capital. The Fund may invest in other securities, including preferred stock, securities convertible into common stock, U.S dollar denominated foreign stock traded on U.S. exchanges, American Depositary Receipts (“ADRs”) and real estate investment trusts (“REITs”). In selecting companies for the Fund, SIMG employs quantitative analysis and fundamental research with a focus on earnings growth. SIMG will sell a security when appropriate and consistent with the Fund's investment objectives and policies.

 

The Fund may also invest cash balances in other investment companies, including money market funds, and may lend its securities to broker-dealers and other institutions to earn additional income.

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 principal risks of investing in the Fund are:

 

Equity Investments Risk

Equity securities are subject to market risk. The Fund's investments in equity securities may include common stocks, preferred stocks, securities convertible into or exchangeable for common stocks, U.S. dollar-denominated foreign stocks traded on U.S. exchanges, REITs, and ADRs. Investing in such securities may expose the Fund to additional risks.

 

Common stock generally is subordinate to preferred stock upon the liquidation or bankruptcy of the issuing company. Preferred stocks and convertible securities are sensitive to movements in interest rates. In addition, convertible securities are subject to the risk that the credit standing of the issuer may have an effect on the convertible securities' investment value. Investments in ADRs are subject to certain of the risks associated with investing directly in foreign securities. REITs are subject to the risks associated with investing in the real estate industry such as adverse developments affecting the real estate industry and real property values.

 

Foreign Exposure Risk

The Fund may invest in securities issued by foreign companies through ADRs and U.S. dollar-denominated foreign stocks traded on U.S. exchanges. These securities are subject to many of the risks inherent in investing in foreign securities, including, but not limited to, currency fluctuations and political and financial instability in the home country of a particular ADR or foreign stock. Non-U.S. investments carry potential risks not associated with U.S. investments. Such risks include, but are not limited to: (1) currency exchange rate fluctuations, (2) political and financial instability, (3) less liquidity and greater volatility, (4) lack of uniform accounting, auditing and financial reporting standards, (5) increased price volatility, and (6) less government regulation and supervision of foreign stock exchanges, brokers and listed companies.

 

Growth Companies Risk

Growth companies are expected to increase their earnings at a certain rate. When these expectations are not met, the prices of these stocks may go down, even if earnings showed an absolute increase. Growth company stocks also typically lack the dividend yield that can cushion stock prices in market downturns. Different investment styles tend to shift in and out of favor, depending on market conditions and investor sentiment. The Fund's growth style could cause the Fund to underperform funds that use a value or non-growth approach to investing or have a broader investment style.

 

Investment Risk

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. 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.

 

Issuer Risk

The value of a security may decline for a number of reasons which directly relate to the issuer, such as management performance, financial leverage and reduced demand for the issuer's goods or services, as well as the historical and prospective earnings of the issuer and the value of its assets.

 

Market Events Risk

Turbulence in financial markets and reduced liquidity in equity, credit and fixed-income markets may negatively affect many issuers worldwide which could adversely affect the Fund.

 

Market Risk

Market risks, including political, regulatory, market and economic developments, and developments that impact specific economic sectors, industries or segments of the market, can affect the value of the Fund's shares. The Fund's equity investments are subject to stock market risk, which involves the possibility that the value of the Fund's investments in stocks will decline due to drops in the stock market. From time to time, certain investments held by the Fund may have limited marketability and may be difficult to sell at favorable times or prices. If the Fund is forced to sell such holdings to meet redemption requests or other cash needs, the Fund may have to sell them at a loss.

 

Medium Capitalization Companies Risk

Investing in the securities of medium capitalization companies involves greater risk and the possibility of greater price volatility than investing in larger capitalization companies and more established companies. Since medium sized companies may have limited operating history, product lines and financial resources, the securities of these companies may lack sufficient market liquidity and can be sensitive to expected changes in interest rates, borrowing costs and earnings.

 

Other Investment Companies Risk

The Fund may invest in shares of other registered investment companies, including open-end funds and money market funds. To the extent that the Fund invests in shares of other registered investment companies, you will indirectly bear fees and expenses charged by the underlying funds in addition to the Fund's direct fees and expenses and will be subject to the risks associated with investments in those funds.

 

Securities Lending Risk

To the extent the Fund lends its securities, it may be subject to the following risks. Borrowers of the Fund's securities typically provide collateral in the form of cash that is reinvested in securities. The securities in which the collateral is invested may not perform sufficiently to cover the return collateral payments owed to borrowers. In addition, delays may occur in the recovery of securities from borrowers, which could interfere with the Fund's ability to vote proxies or to settle transactions.

 

Securities Selection Risk

Securities selected by the sub-advisor or the Manager for the Fund may not perform to expectations. This could result in the Fund's underperformance compared to other funds with similar investment objectives.
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 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

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 the Russell Midcap® Growth Index, which is the Fund's primary benchmark and is a broad measure of market performance.

 

The Investor Class and Institutional Class shares of the Fund have adopted the performance history and financial statements of the Class A and Class I shares, respectively, of the Fund's predecessor. The performance of the Fund's Investor Class shares shown in the chart and table below represents the returns achieved by the Class A shares of the Fund's predecessor from February 1, 2006 to February 24, 2012, and the performance of the Investor Class from February 24, 2012 through December 31, 2013. The table below also shows the performance of the A Class, C Class, Y Class and Institutional Class shares of the Fund. The performance shown for the Institutional Class shares of the Fund represents the performance of the Class I shares from August 31, 2006 to February 24, 2012; and the performance of the Institutional Class shares from February 24, 2012 through December 31, 2013. Returns shown for the Fund's Y Class, A Class and C Class shares represent the returns achieved by the Class A shares of the Fund's predecessor from February 1, 2006 to February 24, 2012, and the performance of the Y Class, A Class and C Class shares, respectively, from February 24, 2012 through December 31, 2013. In each case, the newer share classes would have had similar annual returns to the predecessor Fund's Class A and Class I shares because the shares of each class represent investments in the same portfolio securities. However, the older share classes had different expenses than the newer share classes. 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 Investor Class shares Year-By-Year Percentage Returns as of 12/31 of each Year
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Highest Quarterly Return:

16.31%

(1/1/07 through 12/31/13)

(3rd Quarter 2009)

Lowest Quarterly Return:

-28.39%  

(1/1/07 through 12/31/13)

(4th Quarter 2008)

Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarterly Return:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 16.31%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarterly Return:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (28.39%)
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 individual retirement account or a 401(k), the after-tax returns do not apply to your situation.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for Investor Class shares; after-tax returns for other share classes will vary.
Russell Mid-Cap® Growth Index
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 35.74% [1]
5 Years rr_AverageAnnualReturnYear05 23.37% [1]
Since Inception rr_AverageAnnualReturnSinceInception 8.09% [1]
A Class
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum deferred sales charge - (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 0.50% [2]
Management fees rr_ManagementFeesOverAssets 0.55%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.76% [3]
Total annual fund operating expenses rr_ExpensesOverAssets 1.56%
Fee Waiver and/or expense reimbursement or recoupment of prior waiver/reimbursement ck0000809593_FeeWaiverOrReimbursementAndRecoupmentOverAssets (0.07%)
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.49% [3]
1 year rr_ExpenseExampleYear01 718
3 years rr_ExpenseExampleYear03 1,033
5 years rr_ExpenseExampleYear05 1,370
10 years rr_ExpenseExampleYear10 2,319
1 Year rr_AverageAnnualReturnYear01 24.90% [1]
5 Years rr_AverageAnnualReturnYear05 21.32% [1]
Since Inception rr_AverageAnnualReturnSinceInception 7.23% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 24, 2012 [1]
C Class
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge - (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management fees rr_ManagementFeesOverAssets 0.55%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.73% [3]
Total annual fund operating expenses rr_ExpensesOverAssets 2.28%
Fee Waiver and/or expense reimbursement or recoupment of prior waiver/reimbursement ck0000809593_FeeWaiverOrReimbursementAndRecoupmentOverAssets (0.04%)
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 2.24% [3]
1 year rr_ExpenseExampleYear01 327
3 years rr_ExpenseExampleYear03 708
5 years rr_ExpenseExampleYear05 1,216
10 years rr_ExpenseExampleYear10 2,612
1 year rr_ExpenseExampleNoRedemptionYear01 227
3 years rr_ExpenseExampleNoRedemptionYear03 708
5 years rr_ExpenseExampleNoRedemptionYear05 1,216
10 years rr_ExpenseExampleNoRedemptionYear10 2,612
1 Year rr_AverageAnnualReturnYear01 30.35% [1]
5 Years rr_AverageAnnualReturnYear05 22.44% [1]
Since Inception rr_AverageAnnualReturnSinceInception 7.85% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 24, 2012 [1]
Y Class
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge - (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.55%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.59% [3]
Total annual fund operating expenses rr_ExpensesOverAssets 1.14%
Fee Waiver and/or expense reimbursement or recoupment of prior waiver/reimbursement ck0000809593_FeeWaiverOrReimbursementAndRecoupmentOverAssets (0.05%)
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.09% [3]
1 year rr_ExpenseExampleYear01 111
3 years rr_ExpenseExampleYear03 357
5 years rr_ExpenseExampleYear05 622
10 years rr_ExpenseExampleYear10 1,382
1 Year rr_AverageAnnualReturnYear01 32.96% [1]
5 Years rr_AverageAnnualReturnYear05 22.96% [1]
Since Inception rr_AverageAnnualReturnSinceInception 8.14% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 24, 2012 [1]
Institutional Class
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge - (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.55%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.56% [3]
Total annual fund operating expenses rr_ExpensesOverAssets 1.11%
Fee Waiver and/or expense reimbursement or recoupment of prior waiver/reimbursement ck0000809593_FeeWaiverOrReimbursementAndRecoupmentOverAssets (0.12%)
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.99% [3]
1 year rr_ExpenseExampleYear01 101
3 years rr_ExpenseExampleYear03 341
5 years rr_ExpenseExampleYear05 600
10 years rr_ExpenseExampleYear10 1,341
1 Year rr_AverageAnnualReturnYear01 33.14% [1]
5 Years rr_AverageAnnualReturnYear05 23.14% [1]
Since Inception rr_AverageAnnualReturnSinceInception 10.34% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 31, 2006 [1]
Investor Class
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge - (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.55%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.83% [3]
Total annual fund operating expenses rr_ExpensesOverAssets 1.38%
Fee Waiver and/or expense reimbursement or recoupment of prior waiver/reimbursement ck0000809593_FeeWaiverOrReimbursementAndRecoupmentOverAssets (0.01%)
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.37% [3]
1 year rr_ExpenseExampleYear01 139
3 years rr_ExpenseExampleYear03 436
5 years rr_ExpenseExampleYear05 754
10 years rr_ExpenseExampleYear10 $ 1,657
Annual Return 2007 rr_AnnualReturn2007 24.44%
Annual Return 2008 rr_AnnualReturn2008 (45.89%)
Annual Return 2009 rr_AnnualReturn2009 39.94%
Annual Return 2010 rr_AnnualReturn2010 27.89%
Annual Return 2011 rr_AnnualReturn2011 2.45%
Annual Return 2012 rr_AnnualReturn2012 14.75%
Annual Return 2013 rr_AnnualReturn2013 32.71%
1 Year rr_AverageAnnualReturnYear01 32.71% [1]
5 Years rr_AverageAnnualReturnYear05 22.80% [1]
Since Inception rr_AverageAnnualReturnSinceInception 8.05% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 01, 2006 [1]
Investor Class | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 31.47% [1]
5 Years rr_AverageAnnualReturnYear05 22.55% [1]
Since Inception rr_AverageAnnualReturnSinceInception 7.91% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 01, 2006 [1]
Investor Class | After Taxes on Distributions and Sales
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 19.46% [1]
5 Years rr_AverageAnnualReturnYear05 18.79% [1]
Since Inception rr_AverageAnnualReturnSinceInception 6.48% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 01, 2006 [1]
[1] After-tax returns are shown only for Investor Class shares; after-tax returns for other share classes will vary. 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 individual retirement account or a 401(k), the after-tax returns do not apply to your situation.
[2] A contingent deferred sales charge ('CDSC') of 0.50% will be charged on certain purchases of $1,000,000 or more of A Class shares that are redeemed in whole or part within 18 months of purchase.
[3] The Manager has contractually agreed to reduce and/or reimburse the A Class, C Class, Y Class, Institutional Class, and Investor Class of the Fund for Other Expenses through April 30, 2015 to the extent that Total Annual Fund Operating Expenses for the Fund exceed 1.49% for the A Class, 2.24% for the C Class, 1.09% for the Y Class, 0.99% for the Institutional Class and 1.37% for the Investor Class (excluding taxes, brokerage commissions, acquired fund fees and expenses and other extraordinary expenses such as litigation). The contractual expense reimbursement can be changed only with the approval of a majority of the Fund's Board of Trustees. The Manager can be reimbursed by the Fund for any contractual fee waivers or expense reimbursements if reimbursement to the Manager (a) occurs within three years after the Manager's own waiver or reimbursement and (b) does not cause the Total Annual Fund Operating Expenses of a class to exceed the percentage limit contractually agreed.