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Risk/Return: rr_RiskReturnAbstract  
Entity Central Index Key dei_EntityCentralIndexKey 0000809593
American Beacon SiM High Yield Opportunities Fund | American Beacon SiM High Yield Opportunities Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

American Beacon SiM High Yield Opportunities Fund
Risk/Return Supplement [Text Block] ck0000809593_SupplementTextBlock

American Beacon Zebra Global Equity Fund
American Beacon Zebra Small Cap Equity Fund
American Beacon SiM High Yield Opportunities Fund
American Beacon The London Company Income Equity Fund

 Supplement dated June 30, 2014
to the
Prospectus dated December 27, 2013

Effective July 1, 2014, American Beacon Advisors, Inc. (“Manager”) will reduce the administrative service fee charged to the Fund's A Class and C Class shares from 0.40% to 0.30% of each Class's average daily net assets. At that time, the contractual fee limit for the A Class and C Class shares also will be reduced by 0.10%. The information below supplements the Fund's Prospectus dated December 27, 2013, and is in addition to any other supplement(s):


In the “Fees and Expenses of the Fund” section, the fee table and expense example are replaced with the following:
Expense [Heading] rr_ExpenseHeading

Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

In the “Fees and Expenses of the Fund” section, the fee table and expense example are replaced with the following:

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 2014-12-31
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:

Supplement Closing [Text Block] ck0000809593_SupplementClosingTextBlock

PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE
American Beacon SiM High Yield Opportunities Fund | American Beacon SiM High Yield Opportunities Fund | A Class
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.75%
Maximum deferred sales charge (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 0.50% [1]
Redemption fee (as a percentage of amount redeemed; applies to the proceeds of shares redeemed within 90 days of purchase) rr_RedemptionFeeOverRedemption 2.00%
Management fees rr_ManagementFeesOverAssets 0.48% [2]
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25% [2]
Other Expenses rr_OtherExpensesOverAssets 0.58% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.31% [2]
Fee waiver and/or expense reimbursement or recoupment of prior waiver/reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.07%) [2]
Total Annual Fund Operating Expenses after fee waiver and/or expense reimbursement or recoupment rr_NetExpensesOverAssets 1.24% [2],[3]
1 year rr_ExpenseExampleYear01 $ 595
3 years rr_ExpenseExampleYear03 864
5 years rr_ExpenseExampleYear05 1,153
10 years rr_ExpenseExampleYear10 1,973
American Beacon SiM High Yield Opportunities Fund | American Beacon SiM High Yield Opportunities Fund | 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%
Redemption fee (as a percentage of amount redeemed; applies to the proceeds of shares redeemed within 90 days of purchase) rr_RedemptionFeeOverRedemption 2.00%
Management fees rr_ManagementFeesOverAssets 0.48% [2]
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00% [2]
Other Expenses rr_OtherExpensesOverAssets 0.57% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.05% [2]
Fee waiver and/or expense reimbursement or recoupment of prior waiver/reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.06%) [2]
Total Annual Fund Operating Expenses after fee waiver and/or expense reimbursement or recoupment rr_NetExpensesOverAssets 1.99% [2],[3]
1 year rr_ExpenseExampleYear01 302
3 years rr_ExpenseExampleYear03 637
5 years rr_ExpenseExampleYear05 1,098
10 years rr_ExpenseExampleYear10 2,375
1 year rr_ExpenseExampleNoRedemptionYear01 202
3 years rr_ExpenseExampleNoRedemptionYear03 637
5 years rr_ExpenseExampleNoRedemptionYear05 1,098
10 years rr_ExpenseExampleNoRedemptionYear10 $ 2,375
[1] 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.
[2] The fee table has been restated with respect to the Fund's A Class and C Class Shares to reflect a reduction in the administrative services fee effective July 1, 2014.
[3] The Manager has contractually agreed to reduce and/or reimburse the A Class, C Class, Y Class and Institutional Class of the Fund for Other Expenses, as applicable, through December 31, 2014 to the extent that Total Annual Fund Operating Expenses exceed 1.24% for the A Class, 1.99% for the C Class, 0.94% for the Y Class and 0.84% for the Institutional 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 reductions or expense reimbursements if reimbursement to the Manager (a) occurs within three years after the Manager's own reduction or reimbursement and (b) does not cause the Total Annual Fund Operating Expenses of a class to exceed the contractual percentage limit.