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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName FENIMORE ASSET MANAGEMENT TRUST
Prospectus Date rr_ProspectusDate Jan. 01, 2016
Institutional Shares [Member] | FAM Equity-Income Fund | 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) rr_MaximumDeferredSalesChargeOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.37% [1]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.27% [2]
Fee Waiver/Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.17% [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.10% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 112
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 386
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 681
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,519
Annual Return 2005 rr_AnnualReturn2005 5.75%
Annual Return 2006 rr_AnnualReturn2006 6.57%
Annual Return 2007 rr_AnnualReturn2007 (3.64%)
Annual Return 2008 rr_AnnualReturn2008 (29.04%)
Annual Return 2009 rr_AnnualReturn2009 21.43%
Annual Return 2010 rr_AnnualReturn2010 17.47%
Annual Return 2011 rr_AnnualReturn2011 6.79%
Annual Return 2012 rr_AnnualReturn2012 11.02%
Annual Return 2013 rr_AnnualReturn2013 29.79%
Annual Return 2014 rr_AnnualReturn2014 7.85%
Year to Date Return, Label rr_YearToDateReturnLabel Year-To-Date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2015
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (0.61%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 16.68%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.88%)
1 Year rr_AverageAnnualReturnYear01 7.85%
5 Years rr_AverageAnnualReturnYear05 14.28%
10 Years rr_AverageAnnualReturnYear10 6.20%
Institutional Shares [Member] | FAM Equity-Income Fund | Institutional Class | after taxes on distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 6.62%
5 Years rr_AverageAnnualReturnYear05 13.05%
10 Years rr_AverageAnnualReturnYear10 5.28%
Institutional Shares [Member] | FAM Equity-Income Fund | Institutional Class | after taxes on distributions and sale of fund shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 5.41%
5 Years rr_AverageAnnualReturnYear05 11.47%
10 Years rr_AverageAnnualReturnYear10 4.87%
Institutional Shares [Member] | FAM Equity-Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

FAM Equity-Income Fund
Objective [Heading] rr_ObjectiveHeading

Investment Objective:

Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

FAM Equity-Income Fund's investment objective is to provide current income as well

as long-term capital appreciation by investing primarily (at least 80% of its total assets) in income-producing stocks that pay dividends.
Expense [Heading] rr_ExpenseHeading

Fees and Expenses of the Fund:

Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The tables below describe the fees and expenses that you may pay if you buy

and hold shares of the Fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption

S H A R E H O L D E R   F E E S

(fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption

AN N UA L F U N D O P E R AT I N G E X P E N S E S

(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, 2017
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 10.73% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 10.73%
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent

"Other Expenses" have been restated based on current contractual arrangements and are estimated for the

current fiscal year.
Expense Example [Heading] rr_ExpenseExampleHeading

Expense 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 by, Year, Caption [Text] rr_ExpenseExampleByYearCaption

EXPENSE EXAMPLE
Strategy [Heading] rr_StrategyHeading

Principal  Investment  Strategies:   
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Fenimore  Asset  Management,  Inc.  ("Fenimore"),  the  investment  advisor  to the Fund employs a "value approach" in making its common stock selections.  This approach is based on Fenimore's belief that at any given point in time the stock price of a company may sell below the company's "true business  worth".   Factors  considered  in  evaluating  the  true  business  worth  include  the  company's  current earnings  and  Fenimore's  opinion  as  to  its  future  earnings  potential.   After  identifying  a  company  whose  securities  are  determined  to  have  a  favorable  price-to-earnings  relationship,  Fenimore  plans  to  invest  in  such securities until the "true business worth" nears the market price of the company's securities.

Generally,  the  Fund  will  attempt  to  remain  fully  invested  in  common  stocks  and  securities  that  are  convertible  into  common  stocks,  such  as  convertible  bonds  and  convertible  preferred  stocks.   The  Fund  may  invest in the securities of issuers of all sizes and market capitalizations.   The Fund may also invest in the securities of  both  domestic  and  foreign  issuers  and  it  may  invest  in  shares  of  other  investment  companies,  including exchange-traded funds ("ETFs").
Risk [Heading] rr_RiskHeading

Principal Risks:
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

• Stock  Market  Risk  -   the  value  of  stocks  fluctuate  in  response  to  the  activities  of  individual  companies and  general  stock  market  and  economic  conditions.   Stock  prices  may  decline  over  short  or  extended periods of time.  Stocks are more volatile and riskier than some other forms of investments.

• Stock Selection Risk - the value stocks chosen for the Fund are subject to the risk that the market may never realize their intrinsic value or their prices may go down.

• Small-Cap Risk - small capitalization companies may not have the size, resources or other assets of large capitalization companies.

• Market Risk - the value of your investment will go up and down, which means that you could lose money.

• Foreign Investment Risk - the Fund may invest in securities of foreign issuers that are traded in foreign markets or may be represented by American Depository Receipts that are traded in the United States. Investments in non-U.S. securities may involve additional risk including exchange rate fluctuation, political or economic instability, the imposition of exchange controls, expropriation, limited disclosure and illiquid markets.

• Investment in Other Investment Companies Risk – the Fund may invest in shares of other investment companies, including ETFs. Shareholders of the Fund will indirectly be subject to the fees and expenses of the other investment companies in which the Fund invests. In addition, shareholders will be exposed to the investment risks associated with investments in other investment companies.
Risk Lose Money [Text] rr_RiskLoseMoney the value of your investment will go up and down, which means that you could lose money.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading

Annual Total Return:   
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

 The Institutional Shares of the Fund are a newly established share class and therefore do not yet have their own performance history.The performance results shown on this page and the next page for the periods prior to January 1, 2016, the date of commencement of operations for Institutional Shares, are for a class of shares of the Fund that are not offered in this Prospectus, Investor Shares, which are subject to higher fees as a result of differences in the shareholder administrative services fees and certain other fees paid by each class. Institutional Shares and Investor Shares would have substantially similar performance results because the shares of each class are invested in the same portfolio securities of the Fund. Because of the difference in the level of fees paid by Investor Shares, the returns for the Investor Shares will be lower than the returns for Institutional Shares. The following bar chart and table show some indication of the risks of investing in the Fund. The bar chart shows changes in the Investor Shares performance since 2005. The table shows the Investor Shares average annual returns (before and after taxes ) for the one year, five year and ten year periods compared to those of the Russell MidCap Index, the Fund's primary benchmark index. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Updated performance information may be obtained at the Fund's website famfunds.com.

 
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess The Institutional Shares of the Fund are a newly established share class and therefore do not yet have their own performance history.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress famfunds.com
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Best Quarter (ended 6/30/09):

16.68%

 

Worst Quarter (ended 12/31/08):

-21.88%

The year-to-date return for the Fund's Institutional Shares as of September 30, 2015 was -0.61%.
Bar Chart, Returns for Class Not Offered in Prospectus [Text] rr_BarChartReturnsForClassNotOfferedInProspectus The performance results shown on this page and the next page for the periods prior to January 1, 2016, the date of commencement of operations for Institutional Shares, are for a class of shares of the Fund that are not offered in this Prospectus, Investor Shares, which are subject to higher fees as a result of differences in the shareholder administrative services fees and certain other fees paid by each class.
Performance Table Heading rr_PerformanceTableHeading

A V E R A G E   A N N U A L   T O T A L   R E T U R N

(for the periods ending December 31, 2014)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The  after-tax  returns  shown  in  the  table  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  the  investor's  tax  situation  and  may  differ  from  those  shown.   The  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, or to investors who are tax exempt.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock

The  after-tax  returns  shown  in  the  table  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  the  investor's  tax  situation  and  may  differ  from  those  shown.   The  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, or to investors who are tax exempt.
Institutional Shares [Member] | FAM Equity-Income Fund | Russell MidCap Index  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 13.22%
5 Years rr_AverageAnnualReturnYear05 17.19%
10 Years rr_AverageAnnualReturnYear10 9.56%
[1] "Other Expenses" have been restated based on current contractual arrangements and are estimated for the current fiscal year.
[2] The Advisor has contractually agreed, until May 1, 2017, to waive fees and/or reimburse the Fund certain expenses (excluding interest, taxes, brokerage costs, Acquired Fund Fees and Expenses, dividend expense and extraordinary expenses) to the extent necessary to maintain Net Fund Operating Expenses for Institutional Shares at 1.10%. The Fund has agreed to repay the Advisor for amounts waived or reimbursed by the Advisor pursuant to the Expense Limitation Agreement provided that such repayment does not cause the Net Fund Operating Expenses for Institutional Shares to exceed the above limit and the repayment is made within three years after the year in which the Advisor incurred the expense. This Expense Limitation Agreement may only be amended or terminated by the Fund's Board of Trustees.