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Class I | AMG Yacktman Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading AMG Yacktman Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The AMG Yacktman Fund's (the "Fund") investment objective is to seek long-term capital appreciation and, to a lesser extent, current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The table below describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
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. During the most recent fiscal year, the Fund had a portfolio turnover rate of 6% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 6.00%
Expense Example [Heading] rr_ExpenseExampleHeading Expense Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This Example will help you compare the cost of investing in the Fund to the cost of investing in other mutual funds. The Example makes certain assumptions. It assumes that you invest $10,000 as an initial investment in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. It also assumes that your investment has a 5% total return each year and the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on the above assumptions, your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund invests primarily in domestic equity securities. The Fund, however, also may invest in foreign equity securities, including emerging market securities, and debt securities.
The Fund may invest up to 30% of its assets in foreign equity securities. This 30% limit does not apply to investments in the form of American Depositary Receipts (“ADRs”). The Fund's investments in equity securities may include common stocks, preferred stocks, convertible preferred stocks and ADRs. Some, but not all, of the equity securities will pay a dividend.
The Fund's investments in debt securities may include U.S. Treasury notes and bonds, investment grade corporate debt securities, convertible debt securities and debt securities below investment grade (high yield or junk bonds). The Fund may invest up to 20% of its assets in such debt securities, including junk bonds, in any proportion provided that the total invested does not exceed the 20% threshold at the time of investment.
The Fund's subadviser, Yacktman Asset Management LP (“Yacktman” or the “Subadviser”), employs a disciplined investment strategy. The Fund invests in securities of any size company at levels the Subadviser believes offer an attractive forward rate of return. When the Subadviser purchases stocks, it generally searches for companies that it believes possess one or more of the following three attributes: (1) good business; (2) shareholder-oriented management; or (3) low purchase price. The Fund generally sells companies that no longer meet its investment criteria, or if better investment opportunities are available.
Under normal market conditions, the majority of the Fund’s assets will be allocated to equity securities. The Fund may hold assets in cash and cash equivalents, and at times these holdings may be significant. The Fund’s cash level at any point typically relates to the Subadviser’s individual security selection process, and therefore may vary, depending on the Subadviser’s desired security weightings.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following performance information illustrates 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 performance compares to that of (i) a broad-based index and (ii) an additional index reflecting the market segment(s) in which the Fund invests. As always, past performance of the Fund (before and after taxes) is not an indication of how the Fund will perform in the future.
Effective October 1, 2016, the Fund’s Service Class shares were renamed Class I shares. To obtain updated performance information please visit wealth.amg.com or call 800.548.4539.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information illustrates 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 performance compares to that of (i)a broad-based index and(ii) an additional index reflecting the market segment(s) in which the Fund invests.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Fund continues to use the Russell 1000® Value Index as an additional benchmark that reflects the market segment(s) in which the Fund invests.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800.548.4539
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress wealth.amg.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture As always, past performance of the Fund (before and after taxes) is not an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Returns as of 12/31/24 (Class I)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter: 20.46% (4th Quarter 2020)
Worst Quarter: -21.68% (1st Quarter 2020)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns as of 12/31/24
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective December 31, 2024, the S&P 500® Index was designated as a broad measure of market performance in accordance with recent changes to regulatory disclosure requirements. The Fund continues to use the Russell 1000® Value Index as an additional benchmark that reflects the market segment(s) in which the Fund invests.
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual U.S. 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. After-tax returns are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock
After-tax returns are calculated using the historical highest individual U.S. 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. After-tax returns are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).
Class I | AMG Yacktman Fund | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock There is the risk that you may lose money on your investment.
Class I | AMG Yacktman Fund | Risk Not Insured Depository Institution [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit or obligation of any bank, is not endorsed or guaranteed by any bank, and is not insured by the Federal Deposit Insurance Corporation (“FDIC”) or any other government agency.
Class I | AMG Yacktman Fund | Market Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Market Risk—market prices of investments held by the Fund may fall rapidly or unpredictably due to a variety of factors, including economic or market conditions, or other factors including terrorism, war, natural disasters and the spread of infectious illness or other public health issues, including epidemics or pandemics, or in response to events that affect particular industries or companies. In addition, unexpected political, regulatory, trade and diplomatic events within the United States and abroad may affect investor and consumer confidence and may adversely impact financial markets and the broader economy, perhaps suddenly and to a significant degree.
Class I | AMG Yacktman Fund | Large Capitalization Stock Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Large-Capitalization Stock Risk—the stocks of large-capitalization companies are generally more mature and may not be able to reach the same levels of growth as the stocks of small- or mid-capitalization companies.
Class I | AMG Yacktman Fund | Value Stock Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Value Stock Risk—value stocks may perform differently from the market as a whole and may be undervalued by the market for a long period of time.
Class I | AMG Yacktman Fund | Foreign Investment Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Foreign Investment Risk—investments in foreign issuers involve additional risks (such as risks arising from less frequent trading, changes in political or social conditions, and less publicly available information about non-U.S. issuers) that differ from those associated with investments in U.S. issuers and may result in greater price volatility.
Class I | AMG Yacktman Fund | Management Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Management Risk—because the Fund is an actively managed investment portfolio, security selection or focus on securities in a particular style, market sector or group of companies may cause the Fund to incur losses or underperform relative to its benchmarks or other funds with a similar investment objective. To the extent the Fund invests a substantial portion of its assets in a relatively small number of securities, the Fund’s net asset value may be more volatile and the Fund may involve more risk than a fund that invests in a greater number of securities. There can be no guarantee that the Subadviser’s investment techniques and risk analysis will produce the desired result.
Class I | AMG Yacktman Fund | Convertible Securities Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Convertible Securities Risk— convertible preferred stocks, which are convertible into shares of the issuer’s common stock and pay regular dividends, and convertible debt securities, which are convertible into shares of the issuer’s common stock and bear interest, are subject to the risks of equity securities and fixed income securities. The lower the conversion premium, the more likely the price of the convertible security will follow the price of the underlying common stock. Conversely, higher premium convertible securities are more likely to exhibit the behavior of bonds because the likelihood of conversion is lower, which may cause their prices to fall as interest rates rise. There is the risk that the issuer of convertible preferred stock will not be able to make dividend payments or that the issuer of a convertible bond will not be able to make principal and/or interest payments.
Class I | AMG Yacktman Fund | Credit and Counterparty Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Credit and Counterparty Risk—the issuer of bonds or other debt securities or a counterparty to a derivatives contract (including over-the-counter counterparties as well as brokers and
clearinghouses in respect of exchange-traded and/or cleared products) may be unable or unwilling, or may be perceived as unable or unwilling, to make timely interest, principal or settlement payments or otherwise honor its obligations. Changes in an issuer’s financial strength, credit rating or the market’s perception of an issuer’s creditworthiness may also affect the value of the Fund’s investment in that issuer.
Class I | AMG Yacktman Fund | Currency Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Currency Risk—fluctuations in exchange rates may affect the total loss or gain on a non-U.S. dollar investment when converted back to U.S. dollars and exposure to non-U.S. currencies may subject the Fund to the risk that those currencies will decline in value relative to the U.S. dollar.
Class I | AMG Yacktman Fund | Debt Securities Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Debt Securities Risk—the value of a debt security changes in response to various factors, including, for example, market-related factors, such as changes in interest rates or changes in the actual or perceived ability of an issuer to meet its obligations. Investments in debt securities are subject to, among other risks, credit risk, interest rate risk, extension risk, prepayment risk and liquidity risk.
Class I | AMG Yacktman Fund | Emerging Markets Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Emerging Markets Risk—investments in emerging markets are subject to the general risks of foreign investments, as well as additional risks which can result in greater price volatility. Such additional risks include the risk that markets in emerging market countries are typically less developed and less liquid than markets in developed countries and such markets are subjected to increased economic, political, or regulatory uncertainties.
Class I | AMG Yacktman Fund | Geographic Focus Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Geographic Focus Risk—to the extent the Fund focuses its investments in a particular country, group of countries or geographic region, the Fund is particularly susceptible to economic, political, regulatory or other events or conditions affecting such countries or region, and the Fund’s NAV may be more volatile than the NAV of a more geographically diversified fund and may result in losses.
South Korea. Investments in South Korean issuers will subject the Fund to legal, regulatory, political, currency, security, and economic risks that are specific to South Korea. In addition, economic and political developments of South Korea’s neighbors, including escalated tensions involving North Korea and any outbreak of hostilities involving North Korea, or the threat of an outbreak of such hostilities, may have a severe adverse effect on the South Korean economy. The South Korean economy is reliant on trading exports, and disruptions or decreases in trade activity could lead to declines in South Korea’s economic growth potential.
Class I | AMG Yacktman Fund | High Yield Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
High Yield Risk—below investment grade debt securities and unrated securities of similar credit quality (commonly known as “junk bonds” or “high yield securities”) may be subject to greater levels of interest rate, credit, liquidity, and market risk than higher-rated securities. These securities are considered predominately speculative with respect to the issuer’s continuing ability to make principal and interest payments.
Class I | AMG Yacktman Fund | Interest Rate Risks [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Interest Rate Risk—fixed coupon payments (cash flows) of bonds and debt securities may become less competitive with the market in periods of rising interest rates and cause bond prices to decline. During periods of increasing interest rates, the Fund
may experience high levels of volatility and shareholder redemptions, and may have to sell securities at times when it would otherwise not do so, and at unfavorable prices, which could reduce the returns of the Fund.
Class I | AMG Yacktman Fund | Sector Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Sector Risk—issuers and companies that are in similar industry sectors may be similarly affected by particular economic or market events; to the extent the Fund has substantial holdings within a particular sector, the risks associated with that sector increase.
Class I | AMG Yacktman Fund | Small and Mid Capitalization Stock Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Small- and Mid-Capitalization Stock Risk—the stocks of small- and mid-capitalization companies often have greater price volatility, lower trading volume, and less liquidity than the stocks of larger, more established companies.
Class I | AMG Yacktman Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Management Fee rr_ManagementFeesOverAssets 0.43%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.28%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.71%
1 Year rr_ExpenseExampleYear01 $ 73
3 Years rr_ExpenseExampleYear03 227
5 Years rr_ExpenseExampleYear05 395
10 Years rr_ExpenseExampleYear10 $ 883
2015 rr_AnnualReturn2015 (5.63%)
2016 rr_AnnualReturn2016 11.20%
2017 rr_AnnualReturn2017 18.23%
2018 rr_AnnualReturn2018 2.69%
2019 rr_AnnualReturn2019 17.66%
2020 rr_AnnualReturn2020 15.28%
2021 rr_AnnualReturn2021 19.63%
2022 rr_AnnualReturn2022 (7.37%)
2023 rr_AnnualReturn2023 15.39%
2024 rr_AnnualReturn2024 4.91%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 20.46%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.68%)
1 Year rr_AverageAnnualReturnYear01 4.91%
5 Years rr_AverageAnnualReturnYear05 9.11%
10 Years rr_AverageAnnualReturnYear10 8.77%
Class I | AMG Yacktman Fund | Return After Taxes on Distributions | Class I  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.73%
5 Years rr_AverageAnnualReturnYear05 7.37%
10 Years rr_AverageAnnualReturnYear10 6.42%
Class I | AMG Yacktman Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class I  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 4.50%
5 Years rr_AverageAnnualReturnYear05 7.02%
10 Years rr_AverageAnnualReturnYear10 6.50%
Class I | AMG Yacktman Fund | S&P 500® Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 25.02% [1]
5 Years rr_AverageAnnualReturnYear05 14.53% [1]
10 Years rr_AverageAnnualReturnYear10 13.10% [1]
Class I | AMG Yacktman Fund | Russell 1000® Value Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 14.37% [1]
5 Years rr_AverageAnnualReturnYear05 8.68% [1]
10 Years rr_AverageAnnualReturnYear10 8.49% [1]
[1] Effective December 31, 2024, the S&P 500® Index was designated as a broad measure of market performance in accordance with recent changes to regulatory disclosure requirements. The Fund continues to use the Russell 1000® Value Index as an additional benchmark that reflects the market segment(s) in which the Fund invests.