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Class I and Class Z | AMG Yacktman Special Opportunities Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading AMG Yacktman Special Opportunities Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The AMG Yacktman Special Opportunities Fund’s (the “Fund”) investment objective is to seek long-term capital appreciation.
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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 1, 2026
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 10% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 10.00%
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. The first year of each amount shown in the Example reflects the Fund’s contractual expense limitation through May 1, 2026. 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
In pursuing the objective of long-term capital appreciation, the Fund employs a value-oriented investment approach. The Fund’s investment strategy consists of purchasing securities where Yacktman Asset Management LP (“Yacktman” or the “Subadviser”) believes the current market price offers a meaningful discount to intrinsic value (with value measured on an absolute basis, rather than on a relative basis to the broader market).
The Subadviser employs a fundamental, bottom-up selection process. The Subadviser’s fundamental analysis consists of examining such factors as a company’s history, business model, earnings potential, management team, and industry position. Typical investments will often take into account, but not be limited to, the following factors:
•Businesses the Subadviser believes have a durable competitive position exhibited by high market share, profitability or returns on capital
•Management teams with a track record of strong execution and rational capital allocation
•Low purchase price in relation to a company’s asset value, earnings potential or cash generation ability
Securities are purchased when the Subadviser believes they offer an attractive forward rate of return, after adjusting for business quality and risk. Investments are generally sold when the Subadviser believes the price of the security meets or exceeds its intrinsic value, the Subadviser’s investment criteria are no longer met, or the Subadviser believes more attractive investments become available.
The Fund invests primarily in domestic and foreign equity securities, including emerging market securities, of any market capitalization range. The Fund, however, may also invest in domestic and foreign debt securities. The Fund is not precluded from investing in a growth stock if the Subadviser believes such security otherwise meets its investment criteria.
The Fund’s investments in equity securities may include common stocks, preferred stocks, convertible preferred stocks, warrants, options, American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”) and other depositary receipts of non-U.S. listed companies.
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.
At times, depending on market and other conditions, and at the discretion of the Subadviser, the Fund may invest a substantial portion of its assets in a small number of issuers, business sectors or industries. The Fund is non-diversified.
For hedging and investment purposes, the Fund may engage in short sales of securities, including short sales of securities the Fund does not own.
The Subadviser will generally not hedge the Fund’s currency exposure. However, the Subadviser may hedge a portion of the Fund’s currency exposure on a selective basis as it deems appropriate in an effort to reduce currency risk with respect to specific securities transactions or currencies. In doing so, the Subadviser may use derivatives such as foreign exchange forwards and/or foreign currency options or similar instruments.
Under normal market conditions, the majority of the Fund’s assets will be allocated to equity securities. However, the Fund may not be fully invested at all times, and may often hold a portion of total assets in cash and cash equivalents, which at times may be significant. The Fund’s cash level at any point typically relates to the Subadviser’s individual security selection, and therefore will be a function of the number of opportunities that meet the Subadviser’s investment criteria.
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 a broad based securities market index. 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, outstanding Service Class and Institutional Class shares of the Fund were renamed Class I and Class Z shares, respectively. 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 a broad based securities market index.
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 Z)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter: 27.40% (4th Quarter 2020)
Worst Quarter: -31.94% (1st Quarter 2020)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns as of 12/31/24
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 One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class Z shares only, and after-tax returns for Class I shares will vary.
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”). After-tax returns are shown for Class Z shares only, and after-tax returns for Class I shares will vary.
Class I and Class Z | AMG Yacktman Special Opportunities Fund | Risk Nondiversified Status [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Non-Diversified Fund Risk—the Fund is non-diversified and therefore a greater percentage of holdings may be focused in a small number of issuers or a single issuer, which can place the Fund at greater risk. Notwithstanding the Fund’s status as a “non-diversified” investment company under the Investment Company Act of 1940 (the “1940 Act”), the Fund intends to qualify as a regulated investment company accorded favorable tax treatment under the Internal Revenue Code of 1986, as amended (the “Internal Revenue Code”), which imposes its own diversification requirements that are less restrictive than the requirements applicable to “diversified” investment companies under the 1940 Act. The Fund’s intention to qualify as a regulated investment company may limit its pursuit of its investment strategy and its investment strategy could limit its ability to so qualify.
Class I and Class Z | AMG Yacktman Special Opportunities 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 and Class Z | AMG Yacktman Special Opportunities 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 and Class Z | AMG Yacktman Special Opportunities 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 and Class Z | AMG Yacktman Special Opportunities 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 and Class Z | AMG Yacktman Special Opportunities Fund | Focused Investment Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Focused Investment Risk—to the extent the Fund invests a substantial portion of its assets in a relatively small number of securities or a particular market, industry, group of industries, country, region, group of countries, asset class or sector, it generally will be subject to greater risk than a fund that invests in a more diverse investment portfolio. In addition, the value of the Fund would be more susceptible to any single economic, market, political or regulatory occurrence affecting, for example, that particular market, industry, region or sector.
Class I and Class Z | AMG Yacktman Special Opportunities Fund | Liquidity Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Liquidity Risk—the Fund may not be able to dispose of particular investments, such as illiquid securities, readily at favorable times or prices or the Fund may have to sell them at a loss.
Class I and Class Z | AMG Yacktman Special Opportunities 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 and Class Z | AMG Yacktman Special Opportunities 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 and Class Z | AMG Yacktman Special Opportunities 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 and Class Z | AMG Yacktman Special Opportunities 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 and Class Z | AMG Yacktman Special Opportunities Fund | Derivatives Risks [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk— the use of derivatives involves costs, the risk that the value of derivatives may not correlate perfectly with their underlying assets, rates, or indices, liquidity risk, and the risk of mispricing or improper valuation. The use of derivatives may not succeed for various reasons, and the complexity and rapidly changing structure of derivatives markets may increase the possibility of market losses.
Class I and Class Z | AMG Yacktman Special Opportunities 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 and Class Z | AMG Yacktman Special Opportunities Fund | Hedging Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Hedging Risk—there is no guarantee that hedging strategies will be successful. For example, changes in the value of a hedging transaction may not completely offset changes in the value of the assets and liabilities being hedged. Hedging transactions involve costs and may result in losses.
Class I and Class Z | AMG Yacktman Special Opportunities 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 and Class Z | AMG Yacktman Special Opportunities 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 and Class Z | AMG Yacktman Special Opportunities 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 and Class Z | AMG Yacktman Special Opportunities 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. There can be no guarantee that the Subadviser’s investment techniques and risk analysis will produce the desired result.
Class I and Class Z | AMG Yacktman Special Opportunities Fund | Micro Capitalization Stock Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Micro-Capitalization Stock Risk—the stocks of micro-capitalization companies often have greater price volatility, lower trading volume, and less liquidity than the stocks of larger, more established companies.
Class I and Class Z | AMG Yacktman Special Opportunities Fund | Performance Based Fee Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Performance-Based Fee Risk—the prospect of a positive or negative performance adjustment may create an incentive for the Fund’s portfolio manager to take greater risks with the Fund’s portfolio. In addition, because performance adjustments are based upon past performance, a shareholder may pay a higher or lower management fee for performance that occurred prior to the shareholder’s investment in the Fund.
Class I and Class Z | AMG Yacktman Special Opportunities Fund | Political Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Political Risk—changes in the general political and social environment of a country can have substantial effects on the value of investments exposed to that country.
Class I and Class Z | AMG Yacktman Special Opportunities 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. Stocks in the industrials and energy sectors may comprise a significant portion of the Fund's portfolio.  The industrials sector may be affected by general economic trends, including employment, economic growth and interest rates, changes in consumer confidence and spending, government regulation, commodity prices and competitive pressures. The energy sector may be affected by fluctuations in supply and demand for particular energy products; fluctuations in commodity prices, exchange rates or interest rates; increased governmental or environmental regulation; declines in domestic or foreign production; slowdowns in new construction; extreme weather or other natural disasters; and threats of terrorist attacks on energy assets.
Class I and Class Z | AMG Yacktman Special Opportunities Fund | Short Sales Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Short Sales Risk—a short sale of a security involves the theoretical risk of unlimited loss because of potential unlimited increases in the market price of the security sold short. The Fund’s use of short sales, in certain circumstances, can result in significant losses.
Class I and Class Z | AMG Yacktman Special Opportunities 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 and Class Z | AMG Yacktman Special Opportunities 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 and Class Z | AMG Yacktman Special Opportunities Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Management Fee rr_ManagementFeesOverAssets 0.44% [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.48%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.92% [2]
Fee Waiver and Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.10%) [3]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursements rr_NetExpensesOverAssets 0.82% [2],[3]
1 Year rr_ExpenseExampleYear01 $ 84
3 Years rr_ExpenseExampleYear03 283
5 Years rr_ExpenseExampleYear05 500
10 Years rr_ExpenseExampleYear10 $ 1,122
1 Year rr_AverageAnnualReturnYear01 5.95%
5 Years rr_AverageAnnualReturnYear05 5.77%
10 Years rr_AverageAnnualReturnYear10
Since Inception rr_AverageAnnualReturnSinceInception 7.02% [4]
Class I and Class Z | AMG Yacktman Special Opportunities Fund | Class Z  
Risk/Return: rr_RiskReturnAbstract  
Management Fee rr_ManagementFeesOverAssets 0.44% [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.38%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.82% [2]
Fee Waiver and Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.10%) [3]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursements rr_NetExpensesOverAssets 0.72% [2],[3]
1 Year rr_ExpenseExampleYear01 $ 74
3 Years rr_ExpenseExampleYear03 252
5 Years rr_ExpenseExampleYear05 445
10 Years rr_ExpenseExampleYear10 $ 1,004
2015 rr_AnnualReturn2015 (14.22%)
2016 rr_AnnualReturn2016 25.05%
2017 rr_AnnualReturn2017 34.81%
2018 rr_AnnualReturn2018 (10.14%)
2019 rr_AnnualReturn2019 10.27%
2020 rr_AnnualReturn2020 12.83%
2021 rr_AnnualReturn2021 24.42%
2022 rr_AnnualReturn2022 (13.57%)
2023 rr_AnnualReturn2023 3.44%
2024 rr_AnnualReturn2024 5.95%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 27.40%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (31.94%)
1 Year rr_AverageAnnualReturnYear01 5.95%
5 Years rr_AverageAnnualReturnYear05 5.87%
10 Years rr_AverageAnnualReturnYear10 6.66%
Since Inception rr_AverageAnnualReturnSinceInception [4]
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 2015
Class I and Class Z | AMG Yacktman Special Opportunities Fund | Return After Taxes on Distributions | Class Z  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 3.62%
5 Years rr_AverageAnnualReturnYear05 4.54%
10 Years rr_AverageAnnualReturnYear10 5.19%
Since Inception rr_AverageAnnualReturnSinceInception [4]
Class I and Class Z | AMG Yacktman Special Opportunities Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class Z  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 5.26%
5 Years rr_AverageAnnualReturnYear05 4.49%
10 Years rr_AverageAnnualReturnYear10 5.03%
Since Inception rr_AverageAnnualReturnSinceInception [4]
Class I and Class Z | AMG Yacktman Special Opportunities Fund | MSCI ACWI All Cap Index (net) (reflects no deduction for fees, expenses, or taxes) | Class I  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 16.29%
5 Years rr_AverageAnnualReturnYear05 9.63%
10 Years rr_AverageAnnualReturnYear10 8.98%
Since Inception rr_AverageAnnualReturnSinceInception 9.10% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 2015
[1] The Fund pays a monthly investment management fee consisting of a base fee, plus or minus an adjustment based on the Fund’s performance relative to the MSCI ACWI All Cap Index (net) over the immediately preceding rolling 12 months. The base fee is calculated at an annual rate of 1.37% of the Fund’s average daily net assets for the month. The performance adjustment for each month ranges from an annual rate of -0.75% to +0.75% and is multiplied by the Fund’s average monthly net assets for the prior rolling 12 months.
[2] The Total Annual Fund Operating Expenses and Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursements do not correlate to the ratios of expenses to average net assets in the Financial Highlights section of this Prospectus, which reflect only the operating expenses of the Fund and do not include fees and expenses of any acquired fund, which are reflected in “Other Expenses” above.
[3] AMG Funds LLC (the “Investment Manager”) has contractually agreed, through at least May 1, 2026, to waive investment management fees and/or pay or reimburse the Fund’s expenses in order to limit Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursements (exclusive of investment management fees, administrative fees, taxes, interest (including interest incurred in connection with bank and custody overdrafts and in connection with securities sold short), shareholder servicing fees, distribution and service (12b-1) fees, brokerage commissions and other transaction costs, dividends payable with respect to securities sold short, acquired fund fees and expenses, and extraordinary expenses) of the Fund to the annual rate of 0.12% of the Fund’s average daily net assets (this annual rate or such other annual rate that may be in effect from time to time, the “Expense Cap”), subject to later reimbursement by the Fund in certain circumstances. In general, for a period of up to 36 months after the date any amounts are paid, waived or reimbursed by the Investment Manager, the Investment Manager may recover such amounts from the Fund, provided that such repayment would not cause the Fund’s Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursements (exclusive of the items noted in the parenthetical above) to exceed either (i) the Expense Cap in effect at the time such amounts were paid, waived or reimbursed, or (ii) the Expense Cap in effect at the time of such repayment by the Fund. The contractual expense limitation may only be terminated in the event the Investment Manager or a successor ceases to be the investment manager of the Fund or a successor fund, by mutual agreement between the Investment Manager and the AMG Funds Board of Trustees or in the event of the Fund’s liquidation unless the Fund is reorganized or is a party to a merger in which the surviving entity is successor to the accounting and performance information of the Fund. For purposes of this contractual expense limitation, “investment management fees” includes any performance adjustments.
[4] Class I and Index performance shown reflects performance since the inception date of the Fund's Class I shares on June 30, 2015.