497

December 21, 2012	Rajib Chanda 202-508-4671 202-383-7793 fax rajib.chanda@ropesgray.com

VIA EDGAR

Securities and Exchange Commission

Division of Investment Management

100 F Street, N.E.

Washington, D.C. 20549

Re: Managers AMG Funds

File Nos. 333-84639; 811-09521

Ladies and Gentlemen:

On behalf of Managers AMG Funds (the “Trust”) and pursuant to Rule 497(e) under the Securities Act of 1933, as amended, accompanying this letter for filing are exhibits containing an XBRL interactive data file relating to the supplement, filed with the Securities and Exchange Commission on November 30, 2012 under Rule 497(e) (SEC Accession No. 0001193125-12-487602), to the Prospectus for Essex Small/Micro Cap Growth Fund dated October 1, 2012.

The purpose of this filing is to submit an XBRL interactive data file in the manner provided by Rule 405 of Regulation S-T, General Instruction C.3.(g) of Form N-1A, and Rule 497(e).

If you have any questions concerning this filing, please call me at (202) 508-4671.

Sincerely,

/s/ Rajib Chanda

Rajib Chanda

XML

Managers AMG Funds - Essex Small/Micro Cap Growth Fund (Prospectus Summary) | Managers AMG Funds - Essex Small/Micro Cap Growth Fund

Essex Small/Micro Cap Growth Fund

INVESTMENT OBJECTIVE

The Essex Small/Micro Cap Growth Fund's (the "Fund") investment objective
is to achieve long-term capital appreciation.

FEES AND EXPENSES OF THE FUND

The table below describes the fees and expenses that you may pay if you
buy and hold shares of the Fund.

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		Managers AMG Funds - Essex Small/Micro Cap Growth Fund Investor Class
Management Fee		1.00%
Distribution and Service (12b-1) Fees		0.25%
Other Expenses		0.20%
Total Annual Fund Operating Expenses	[1]	1.45%

EXPENSE EXAMPLE

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 Example reflects the
impact of the Fund's contractual expense limitation through October 1, 2014.

Although your actual costs may be higher or lower, based on the above assumptions, your cost would be:

Expense Example (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Managers AMG Funds - Essex Small/Micro Cap Growth Fund Investor Class	148	459	792	1,735

PORTFOLIO TURNOVER

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 74%
of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

Under normal circumstances, the Fund invests at least 80% of its net assets,
plus the amount of any borrowings for investment purposes, in common and
preferred stocks of small-capitalization U.S. companies.

Essex Investment Management Company, LLC ("Essex") generally considers a
company to be a "small-capitalization" company if, at the time of purchase,
its market capitalization is less than or equal to the market capitalization
of the largest company included within the Russell 2000 ® Growth Index. As of
the latest reconstitution of the Index on May 31, 2012, the market capitalization
of the largest company included in the Russell 2000® Growth Index was approximately
$2.6 billion. This figure may fluctuate as market conditions change and during
periods of increased market volatility. The Fund's investments include U.S.
micro-cap companies, which, at the time of purchase, have capitalizations that
place them among the smallest 5% of companies listed on U.S. exchanges or in
over the counter (OTC) markets. The Fund currently invests a significant portion
of its assets in companies in the technology and health care sectors. In
addition, the Fund may also invest in foreign securities, primarily in the form
of American Depositary Receipts ("ADRs") and emerging market securities.
  
Essex serves as subadvisor to the Fund and applies fundamental investment
research techniques when deciding which stocks to buy or sell. Typically, Essex:

•   Selects companies that demonstrate accelerating growth in earnings and      
    revenues that Essex believes are undervalued given their financial strength.

•   Invests in companies from all sectors of the market based on Essex's        
    fundamental research and analysis of various characteristics.      

•   Reviews and evaluates each company's financial statements, sales and expense
    trends, earnings estimates, market position, and industry outlook.           

•   Values a company against its history, industry, and the market to identify a
    relatively undervalued stock as compared to its potential growth.           
  
•   Sells all or part of the Fund's holdings in a particular stock if the       
    valuation is no longer attractive compared with expectations of the Fund's  
    long-term growth.                                     

While Essex is committed to a small-cap and micro-cap focus for the overall
portfolio, Essex may decide to keep a company's stock if it has appreciated
beyond the market capitalization of the largest company included in the Russell
2000® Growth Index, as described above.

PRINCIPAL RISKS

There is the risk that you may lose money on your investment. All investments
carry a certain amount of risk and the Fund cannot guarantee that it will
achieve its investment objective. 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. Below are some of the risks of investing in the Fund.

Emerging Markets Risk -investments in emerging markets can be subject to the
general risks of foreign investments, as well as additional risks which can
result in greater price volatility.

Foreign Securities Risk -securities or other investments of 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
investing in securities of U.S. issuers and may result in greater price
volatility.

Growth Stock Risk -growth stocks may be more sensitive to market movements
because their prices tend to reflect future investor expectations rather than
just current profits.

Market Risk -market prices of securities held by the Fund may fall rapidly or
unpredictably due to a variety of factors, including changing economic,
political, or market conditions.

Political Risk -changes in the political status of any country can have profound
effects on the value of investments exposed to that country.

Sector Risk -companies or issuers 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 technology, industrials, and health
care sectors currently, and may in the future, comprise a significant portion of
the Fund's portfolio. The technology industries may be affected by technological
obsolescence, short product cycles, falling prices and profits, competitive
pressures and general market conditions. Industrial industries companies 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. Companies in the health care sector
may be affected by government regulation, government approval of products and
services, technological obsolescence, patent expirations, product liability or
other litigation, and changes in governmental and private payment systems.

Small- and Micro-Capitalization Stock Risk -the stocks of small- and
micro-capitalization companies often have greater price volatility, lower
trading volume, and less liquidity than the stocks of larger, more established
companies.

PERFORMANCE

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. The performance information for the Fund's Investor Class shares
(formerly Class A shares of the Fund, which were renamed Investor Class shares
as of the date of this Prospectus) for periods prior to November 30, 2012 does
not reflect the impact of the front end and deferred sales charges (loads) that
were in effect from March 1, 2006 until November 30, 2012. As always, past
performance of the Fund (before and after taxes) is not an indication of how
the Fund will perform in the future. To obtain updated performance information
please visit www. managersinvest.com or call 800.835.3879.

The performance information shown in the bar chart and table includes performance
of the Fund's predecessor, a 401(k) plan trust (the "Predecessor Account"), for
periods prior to the Fund's inception on June 25, 2002. The Predecessor Account
was not registered with the Securities and Exchange Commission and therefore was
not subject to the investment restrictions imposed on registered mutual funds.
If the Predecessor Account had been registered, its performance may have been
adversely affected. The Predecessor Account was also subject to different fees
and expenses than the Fund.

Calendar Year Total Returns as of 12/31/11 (Investor Class)

Best Quarter: 27.07% (2nd Quarter 2003)

Worst Quarter: -29.43% (4th Quarter 2008)

Average Annual Total Returns as of 12/31/11

Average Annual Total Returns Managers AMG Funds - Essex Small/Micro Cap Growth Fund	Label	1 Year	5 Years	10 Years	Since Inception	Inception Date
Investor Class	Investor Class Return Before Taxes	10.78%	(1.69%)	5.57%
Investor Class After Taxes on Distributions	Investor Class Return After Taxes on Distributions	15.90%	(2.87%)	4.71%
Investor Class After Taxes on Distributions and Sales	Investor Class Return After Taxes on Distributions and Sale of Fund Shares	10.34%	(2.39%)	4.25%
Russell 2000® Growth Index	Russell 2000® Growth Index (reflects no deduction for fees, expenses, or taxes)	(2.91%)	2.09%	4.48%	2.17%	Mar. 01, 2006

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. After-tax returns are not relevant to investors who
hold their Fund shares through tax-deferred arrangements, such as 401(k) plans
or individual retirement accounts.

[1] Managers Investment Group LLC (the "Investment Manager") has contractually agreed, through October 1, 2014, to waive management fees and/or reimburse Fund expenses in order to limit Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursements (exclusive of taxes, interest (including interest incurred in connection with bank and custody overdrafts), brokerage commissions and other transaction costs, acquired fund fees and expenses, and extraordinary expenses) to 1.49% of the Fund's average daily net assets, subject to later reimbursement by the Fund in certain circumstances. In general, for a period of up to 36 months from the time of any waiver, reimbursement, or payment pursuant to the Fund's contractual expense limitation, the Investment Manager may recover from the Fund fees waived and expenses paid to the extent that such repayment would not cause the Fund's Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursements to exceed the contractual expense limitation amount. Acquired Fund Fees and Expenses are not subject to waiver and do not factor into the Fund's contractual expense limitation. The contractual expense limitation can only be terminated upon termination of the Fund's investment advisory agreement with the Investment Manager or by mutual agreement between the Investment Manager and the Fund's Board of Trustees.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Nov. 30, 2012
Managers AMG Funds - Essex Small/Micro Cap Growth Fund (Prospectus Summary) | Managers AMG Funds - Essex Small/Micro Cap Growth Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Essex Small/Micro Cap Growth Fund
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Essex Small/Micro Cap Growth Fund's (the "Fund") investment objective is to achieve 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 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. During the most recent fiscal year, the Fund's portfolio turnover rate was 74% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	74.00%
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 Example reflects the impact of the Fund's contractual expense limitation through October 1, 2014.
Expense Example by, Year, Caption [Text]	rr_ExpenseExampleByYearCaption	Although your actual costs may be higher or lower, based on the above assumptions, your cost would be:
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 the amount of any borrowings for investment purposes, in common and preferred stocks of small-capitalization U.S. companies. Essex Investment Management Company, LLC ("Essex") generally considers a company to be a "small-capitalization" company if, at the time of purchase, its market capitalization is less than or equal to the market capitalization of the largest company included within the Russell 2000 ® Growth Index. As of the latest reconstitution of the Index on May 31, 2012, the market capitalization of the largest company included in the Russell 2000® Growth Index was approximately $2.6 billion. This figure may fluctuate as market conditions change and during periods of increased market volatility. The Fund's investments include U.S. micro-cap companies, which, at the time of purchase, have capitalizations that place them among the smallest 5% of companies listed on U.S. exchanges or in over the counter (OTC) markets. The Fund currently invests a significant portion of its assets in companies in the technology and health care sectors. In addition, the Fund may also invest in foreign securities, primarily in the form of American Depositary Receipts ("ADRs") and emerging market securities.    Essex serves as subadvisor to the Fund and applies fundamental investment research techniques when deciding which stocks to buy or sell. Typically, Essex: •   Selects companies that demonstrate accelerating growth in earnings and           revenues that Essex believes are undervalued given their financial strength. •   Invests in companies from all sectors of the market based on Essex's             fundamental research and analysis of various characteristics.       •   Reviews and evaluates each company's financial statements, sales and expense     trends, earnings estimates, market position, and industry outlook.            •   Values a company against its history, industry, and the market to identify a     relatively undervalued stock as compared to its potential growth.               •   Sells all or part of the Fund's holdings in a particular stock if the            valuation is no longer attractive compared with expectations of the Fund's       long-term growth.                                      While Essex is committed to a small-cap and micro-cap focus for the overall portfolio, Essex may decide to keep a company's stock if it has appreciated beyond the market capitalization of the largest company included in the Russell 2000® Growth Index, as described above.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	There is the risk that you may lose money on your investment. All investments carry a certain amount of risk and the Fund cannot guarantee that it will achieve its investment objective. 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. Below are some of the risks of investing in the Fund. Emerging Markets Risk -investments in emerging markets can be subject to the general risks of foreign investments, as well as additional risks which can result in greater price volatility. Foreign Securities Risk -securities or other investments of 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 investing in securities of U.S. issuers and may result in greater price volatility. Growth Stock Risk -growth stocks may be more sensitive to market movements because their prices tend to reflect future investor expectations rather than just current profits. Market Risk -market prices of securities held by the Fund may fall rapidly or unpredictably due to a variety of factors, including changing economic, political, or market conditions. Political Risk -changes in the political status of any country can have profound effects on the value of investments exposed to that country. Sector Risk -companies or issuers 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 technology, industrials, and health care sectors currently, and may in the future, comprise a significant portion of the Fund's portfolio. The technology industries may be affected by technological obsolescence, short product cycles, falling prices and profits, competitive pressures and general market conditions. Industrial industries companies 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. Companies in the health care sector may be affected by government regulation, government approval of products and services, technological obsolescence, patent expirations, product liability or other litigation, and changes in governmental and private payment systems. Small- and Micro-Capitalization Stock Risk -the stocks of small- and micro-capitalization companies often have greater price volatility, lower trading volume, and less liquidity than the stocks of larger, more established companies.
Risk Lose Money [Text]	rr_RiskLoseMoney	There is the risk that you may lose money on your investment.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	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.
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. The performance information for the Fund's Investor Class shares (formerly Class A shares of the Fund, which were renamed Investor Class shares as of the date of this Prospectus) for periods prior to November 30, 2012 does not reflect the impact of the front end and deferred sales charges (loads) that were in effect from March 1, 2006 until November 30, 2012. As always, past performance of the Fund (before and after taxes) is not an indication of how the Fund will perform in the future. To obtain updated performance information please visit www. managersinvest.com or call 800.835.3879. The performance information shown in the bar chart and table includes performance of the Fund's predecessor, a 401(k) plan trust (the "Predecessor Account"), for periods prior to the Fund's inception on June 25, 2002. The Predecessor Account was not registered with the Securities and Exchange Commission and therefore was not subject to the investment restrictions imposed on registered mutual funds. If the Predecessor Account had been registered, its performance may have been adversely affected. The Predecessor Account was also subject to different fees and expenses than the Fund.
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	800.835.3879
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www. managersinvest.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 12/31/11 (Investor Class)
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Best Quarter: 27.07% (2nd Quarter 2003) Worst Quarter: -29.43% (4th Quarter 2008)
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	reflects no deduction for fees, expenses, or taxes
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	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-deferred arrangements, such as 401 (k) plans or individual retirement accounts.
Performance Table Closing [Text Block]	rr_PerformanceTableClosingTextBlock	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. After-tax returns are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Caption	rr_AverageAnnualReturnCaption	Average Annual Total Returns as of 12/31/11
Managers AMG Funds - Essex Small/Micro Cap Growth Fund (Prospectus Summary) | Managers AMG Funds - Essex Small/Micro Cap Growth Fund | Russell 2000® Growth Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Russell 2000® Growth Index (reflects no deduction for fees, expenses, or taxes)
1 Year	rr_AverageAnnualReturnYear01	(2.91%)
5 Years	rr_AverageAnnualReturnYear05	2.09%
10 Years	rr_AverageAnnualReturnYear10	4.48%
Since Inception	rr_AverageAnnualReturnSinceInception	2.17%
Inception Date	rr_AverageAnnualReturnInceptionDate	Mar. 01, 2006
Managers AMG Funds - Essex Small/Micro Cap Growth Fund (Prospectus Summary) | Managers AMG Funds - Essex Small/Micro Cap Growth Fund | Investor Class
Risk Return [Abstract]	rr_RiskReturnAbstract
Management Fee	rr_ManagementFeesOverAssets	1.00%
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets	0.20%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.45%	[1]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2014-10-01
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	148
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	459
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	792
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,735
Annual Return 2002	rr_AnnualReturn2002	(21.34%)
Annual Return 2003	rr_AnnualReturn2003	66.41%
Annual Return 2004	rr_AnnualReturn2004	15.74%
Annual Return 2005	rr_AnnualReturn2005	13.90%
Annual Return 2006	rr_AnnualReturn2006	8.55%
Annual Return 2007	rr_AnnualReturn2007	17.45%
Annual Return 2008	rr_AnnualReturn2008	(47.72%)
Annual Return 2009	rr_AnnualReturn2009	30.97%
Annual Return 2010	rr_AnnualReturn2010	28.01%
Annual Return 2011	rr_AnnualReturn2011	(10.78%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2003
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	27.07%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(29.43%)
Label	rr_AverageAnnualReturnLabel	Investor Class Return Before Taxes
1 Year	rr_AverageAnnualReturnYear01	10.78%
5 Years	rr_AverageAnnualReturnYear05	(1.69%)
10 Years	rr_AverageAnnualReturnYear10	5.57%
Since Inception	rr_AverageAnnualReturnSinceInception
Managers AMG Funds - Essex Small/Micro Cap Growth Fund (Prospectus Summary) | Managers AMG Funds - Essex Small/Micro Cap Growth Fund | Investor Class | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Investor Class Return After Taxes on Distributions
1 Year	rr_AverageAnnualReturnYear01	15.90%
5 Years	rr_AverageAnnualReturnYear05	(2.87%)
10 Years	rr_AverageAnnualReturnYear10	4.71%
Since Inception	rr_AverageAnnualReturnSinceInception
Managers AMG Funds - Essex Small/Micro Cap Growth Fund (Prospectus Summary) | Managers AMG Funds - Essex Small/Micro Cap Growth Fund | Investor Class | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Investor Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year	rr_AverageAnnualReturnYear01	10.34%
5 Years	rr_AverageAnnualReturnYear05	(2.39%)
10 Years	rr_AverageAnnualReturnYear10	4.25%
Since Inception	rr_AverageAnnualReturnSinceInception

[1] Managers Investment Group LLC (the "Investment Manager") has contractually agreed, through October 1, 2014, to waive management fees and/or reimburse Fund expenses in order to limit Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursements (exclusive of taxes, interest (including interest incurred in connection with bank and custody overdrafts), brokerage commissions and other transaction costs, acquired fund fees and expenses, and extraordinary expenses) to 1.49% of the Fund's average daily net assets, subject to later reimbursement by the Fund in certain circumstances. In general, for a period of up to 36 months from the time of any waiver, reimbursement, or payment pursuant to the Fund's contractual expense limitation, the Investment Manager may recover from the Fund fees waived and expenses paid to the extent that such repayment would not cause the Fund's Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursements to exceed the contractual expense limitation amount. Acquired Fund Fees and Expenses are not subject to waiver and do not factor into the Fund's contractual expense limitation. The contractual expense limitation can only be terminated upon termination of the Fund's investment advisory agreement with the Investment Manager or by mutual agreement between the Investment Manager and the Fund's Board of Trustees.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
Document Type	dei_DocumentType	Other
Document Period End Date	dei_DocumentPeriodEndDate	May 31, 2012
Registrant Name	dei_EntityRegistrantName	MANAGERS AMG FUNDS
Central Index Key	dei_EntityCentralIndexKey	0001089951
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Nov. 30, 2012
Document Effective Date	dei_DocumentEffectiveDate	Nov. 30, 2012
Managers AMG Funds - Essex Small/Micro Cap Growth Fund (Prospectus Summary) | Managers AMG Funds - Essex Small/Micro Cap Growth Fund | Investor Class
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MBRSX