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Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading FPA Paramount Fund, Inc.
Objective [Heading] rr_ObjectiveHeading Investment Objective.
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Fund's primary investment objective is a high total investment return, including capital appreciation and income.

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

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

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that are deducted from Fund assets)
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 113% of the average value of its whole portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 113.00%rr_PortfolioTurnoverRate
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Management Fees are restated reflecting the fee under the Investment Advisory Agreement approved on November 15, 2013.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes 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:

Strategy [Heading] rr_StrategyHeading Principal Investment Strategies.
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund will invest primarily in equity securities of companies with market capitalizations in excess of $2 billion, which includes companies domiciled outside of the United States. Thus, most of the Fund's securities are mid- or large-capitalization companies. The Fund invests in companies that the Adviser believes are high-quality, financially strong businesses, with management teams that build shareholder value over time. The Fund seeks to invest in these businesses when their market prices are less than the Adviser's estimate of their intrinsic values.


The Fund's universe of potential investments primarily includes companies domiciled in jurisdictions where the Adviser believes reasonable business practices exist. In investing the Fund's assets, the Adviser focuses on countries with established rules of law and political systems that allow for transparent and unbiased enforcement of those laws. There are no geographic limits on the Fund's investments, but the Fund will seek to maintain a minimum of 20% of its assets invested in both U.S. stocks and international stocks at all times. In addition, the Fund may invest in American Depositary Receipts ("ADRs"), which are receipts that represent interests in foreign securities held on deposit by U.S. banks, or other depository receipts.


Key Investment Criteria


1.  Business Quality. The Adviser seeks to invest in businesses with high barriers to market entry, low threat of substitutes, sustainable competitive advantages, and power over customers as well as suppliers.


2.  Financial Strength. The Adviser considers the overall financial strength of businesses. The Adviser seeks to avoid companies that expose their shareholders to a material risk of permanent capital loss.


3.  Strong Management. The Adviser seeks to invest in companies with management teams that have histories of both operational excellence and capital allocation that builds shareholder value.


4.  Low Absolute Valuation. The Adviser only makes investments when the Adviser believes the investment offers a margin of safety (i.e. when shares trade at a discount to the Adviser's estimate of their intrinsic value).


Given the Fund's strict investment criteria, a broad investment universe, a limited number of holdings in the portfolio, a benchmark-agnostic approach, and an ability to hold some level of cash are all important aspects of the Fund's strategy. While there are thousands of publicly listed companies in the world, the Adviser believes that only a limited number of them combine strong business fundamentals, financial strength, and shareholder-friendly management teams while trading at a discount to intrinsic value, which leads the Adviser to run a more concentrated portfolio. The Adviser's benchmark-agnostic approach focuses on whether an opportunity meets all of the investment criteria, rather than where the company is domiciled or which sector or industry it operates in. The Adviser expects the Fund to generally invest in 25 to 50 companies at any given time. Under normal circumstances, the Fund will not hold more than 10% of its assets in cash or cash equivalents.


Investment Process. The Adviser performs security selection on a bottom-up basis and conducts extensive research on individual investment candidates focusing on business fundamentals. The Adviser uses its research findings to estimate the intrinsic value of businesses. The Fund's portfolio construction is the product of this research and valuation process. The Adviser adds to a list of portfolio investments those companies that meet the Adviser's qualitative investment criteria and offer a sufficient margin of safety. The Adviser ranks all portfolio securities according to the relative discount to the Adviser's estimate of intrinsic value and usually allocates the largest portfolio weightings to those investments that the Adviser believes offer the highest margin of safety. The Adviser believes that this approach allows its best ideas to have a meaningful impact on the Fund's performance.


The Fund may sell a portfolio holding when the holding's market price appreciates and approaches the Adviser's estimate of intrinsic value; the Adviser finds an opportunity to reallocate the Fund's assets to other investments with greater reward potential; or the original investment thesis no longer holds.

Risk [Heading] rr_RiskHeading Principal Investment Risks.
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

As with all mutual funds, your investment in the Fund may be worth more or less at any time than the price that you originally paid for it. There is also a possibility that the Fund will not achieve its investment objective or goal. This could happen because its strategy failed to produce the intended results or because the Adviser did not implement its strategy properly. Due to the relatively low number of holdings, the Fund will be more susceptible to company-specific events and risks impacting the particular securities held by the Fund than would be a fund with more holdings. The Fund's shares are not bank deposits and are not guaranteed, endorsed or insured by any financial institution, government authority or the FDIC.


Risks Associated with Non-Diversification. The Fund is non-diversified, which generally means that it may invest a greater percentage of its total assets in the securities of fewer issuers than a "diversified" fund. This increases the risk that a change in the value of any one investment held by the Fund could affect the overall value of the Fund more than it would affect that of a diversified fund holding a greater number of investments. Accordingly, the Fund's value will likely be more volatile than the value of a more diversified fund.


Risks Associated with Investing in Equities. As with all equity funds, the risks that could affect the value of the Fund's shares and the total return on your investment include the possibility that the equity securities, generally common stocks and/or ADRs, held by the Fund will experience sudden, unpredictable drops in value or long periods of decline in value. This may occur because of factors that affect the securities markets generally, such as adverse changes in economic conditions, the general outlook for corporate earnings, interest rates or investor sentiment. Equity securities may also lose value because of factors affecting an entire industry or sector, such as increases in production costs, or factors directly related to a specific company, such as decisions made by its management. Global stock markets have been subject to significant volatility recently, including issues relating to the European sovereign debt crisis, which have increased the risk associated with an investment in the Fund. These risks are greater for small and medium sized companies, which tend to be more vulnerable to adverse developments than larger companies.


Risks Associated with Investing in Mid-Cap and Smaller-Cap Companies. The prices of securities of mid-cap and smaller-cap companies tend to fluctuate more widely than those of larger, more established companies. Mid-cap and smaller-cap companies may have limited product lines, markets or financial resources or may depend on the expertise of a few people and may be subject to more abrupt or erratic market movements than securities of larger, more established companies or the market averages in general. In addition, these companies often have shorter operating histories than larger companies. Securities of such issuers may lack sufficient market liquidity to effect sales at an advantageous time or without a substantial drop in price.


Risks Associated with Investing in Foreign Securities. Since the Fund may invest a significant portion of its assets in foreign securities, it will be subject to risks not typically associated with investing in domestic securities. Foreign investments can be riskier, more volatile and less liquid than investments in the United States. Adverse political, social and economic developments or instability, or changes in the value of foreign currency can make it more difficult for the Fund to sell its securities and could reduce the value of your shares. Differences in regulatory, tax and accounting standards and differences in reporting standards can cause difficulties in obtaining information about foreign companies and can negatively affect investment decisions. Investments in foreign securities could be affected by restrictions on receiving investment proceeds from a foreign country, confiscatory foreign tax laws, and potential difficulties in enforcing contractual obligations. Transactions may be subject to less efficient settlement practices, including extended clearance and settlement periods.


The financial problems in global economies over the past several years, including the European sovereign debt crisis, may continue to cause high volatility in global financial markets. In addition, global economies are increasingly interconnected, which increases the possibilities that conditions in one country or region might adversely impact a different country or region. The severity or duration of these conditions may also be affected if one or more countries leave the euro currency or by other policy changes made by governments or quasi-governmental organizations.


The Fund may invest in ADRs and similar depositary receipts, which may be sponsored by the foreign issuer or unsponsored. ADRs and similar depositary receipts are subject to the risks of changes in currency or exchange rates and the risks of investing in foreign securities that they evidence or into which they may be converted. The issuers of unsponsored depositary receipts are not obligated to disclose information that would be, in the United States, considered material. Therefore, there may be less information available regarding these issuers, and there may not be a correlation between such information and the market value of the depositary receipts.


Risks Associated with Value Stocks. Value stocks, including those selected by the Adviser for the Fund, are subject to the risks that their intrinsic value may never be realized by the market and that their prices may go down. In addition, the market may favor certain stocks (value stocks vs. growth stocks) and the Fund may hold investments that are out of favor.


Because of these and other risks, you could lose money by investing in the Fund.

Risk Lose Money [Text] rr_RiskLoseMoney Because of these and other risks, you could lose money by investing in the Fund.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus The Fund is non-diversified, which generally means that it may invest a greater percentage of its total assets in the securities of fewer issuers than a "diversified" fund. This increases the risk that a change in the value of any one investment held by the Fund could affect the overall value of the Fund more than it would affect that of a diversified fund holding a greater number of investments. Accordingly, the Fund's value will likely be more volatile than the value of a more diversified fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution The Fund's shares are not bank deposits and are not guaranteed, endorsed or insured by any financial institution, government authority or the FDIC.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Updated Performance Information.
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

To obtain updated monthly performance information, please visit the Fund's website at www.fpafunds.com or call (800) 982-4372.


Performance Information. The bar chart and Average Annual Total Returns table below provide an indication of 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 average annual returns for 1, 5 and 10 calendar years compare with those of two broad-based securities market indexes. The chart and table reflect the reinvestment of dividends and other distributions. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.


The Russell 2500 Index consists of the 2,500 smallest companies in the Russell 3000 total capitalization universe. This index is considered a measure of small to mid-capitalization stock performance and is included as a broad-based comparison to the capitalization characteristics of the Fund's portfolio. The MSCI All Country World NR Index is a float-adjusted market capitalization index that is designed to measure the combined equity market performance of developed and emerging markets. In connection with the transition of primary portfolio management responsibilities in September 2013, the Fund added the MSCI All Country World NR Index as a benchmark.

Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and Average Annual Total Returns table below provide an indication of 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 average annual returns for 1, 5 and 10 calendar years compare with those of two broad-based securities market indexes.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Russell 2500 Index consists of the 2,500 smallest companies in the Russell 3000 total capitalization universe. This index is considered a measure of small to mid-capitalization stock performance and is included as a broad-based comparison to the capitalization characteristics of the Fund's portfolio. The MSCI All Country World NR Index is a float-adjusted market capitalization index that is designed to measure the combined equity market performance of developed and emerging markets. In connection with the transition of primary portfolio management responsibilities in September 2013, the Fund added the MSCI All Country World NR Index as a benchmark.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone (800) 982-4372
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.fpafunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

The Fund's highest/lowest quarterly results during this time period were:


Highest

   

22.19

%

 

(Quarter ended 6/30/09)

 

Lowest

   

(29.12

)%

 

(Quarter ended 12/31/08)

 
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 22.19%rr_BarChartHighestQuarterlyReturn
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (29.12%)rr_BarChartLowestQuarterlyReturn
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deductions 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 upon an investor's tax situation and may differ from those shown. After-tax returns presented here are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts ("IRAs"). Early withdrawal from a 401(k) account or an IRA could lead to taxation of the withdrawn amount as ordinary income and could be subject to an additional tax penalty.
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (for the periods ended December 31, 2014)
Russell 2500 (reflects no deductions for fees, expenses or taxes)
 
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 7.07%rr_AverageAnnualReturnYear01
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Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 16.36%rr_AverageAnnualReturnYear05
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Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.72%rr_AverageAnnualReturnYear10
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MSCI All Country World NR Index (reflects no deductions for fees, expenses or taxes)
 
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 4.16%rr_AverageAnnualReturnYear01
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Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 9.17%rr_AverageAnnualReturnYear05
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Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 6.09%rr_AverageAnnualReturnYear10
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FPA Paramount Fund, Inc.
 
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of original sales price or redemption proceeds, as applicable) rr_MaximumDeferredSalesChargeOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)rr_RedemptionFeeOverRedemption
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Exchange Fee rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 1.00%rr_ManagementFeesOverAssets
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[1]
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Component1 Other Expenses rr_Component1OtherExpensesOverAssets 0.16%rr_Component1OtherExpensesOverAssets
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Financial Services rr_Component2OtherExpensesOverAssets 0.10%rr_Component2OtherExpensesOverAssets
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Other Expenses rr_OtherExpensesOverAssets 0.26%rr_OtherExpensesOverAssets
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Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.26%rr_ExpensesOverAssets
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Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 128rr_ExpenseExampleYear01
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Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 400rr_ExpenseExampleYear03
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Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 692rr_ExpenseExampleYear05
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Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,523rr_ExpenseExampleYear10
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Annual Return 2005 rr_AnnualReturn2005 12.20%rr_AnnualReturn2005
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Annual Return 2006 rr_AnnualReturn2006 4.76%rr_AnnualReturn2006
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Annual Return 2007 rr_AnnualReturn2007 6.83%rr_AnnualReturn2007
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Annual Return 2008 rr_AnnualReturn2008 (38.07%)rr_AnnualReturn2008
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Annual Return 2009 rr_AnnualReturn2009 45.79%rr_AnnualReturn2009
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Annual Return 2010 rr_AnnualReturn2010 23.63%rr_AnnualReturn2010
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Annual Return 2011 rr_AnnualReturn2011 (3.69%)rr_AnnualReturn2011
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Annual Return 2012 rr_AnnualReturn2012 15.97%rr_AnnualReturn2012
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Annual Return 2013 rr_AnnualReturn2013 27.75%rr_AnnualReturn2013
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Annual Return 2014 rr_AnnualReturn2014 (5.31%)rr_AnnualReturn2014
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Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (5.31%)rr_AverageAnnualReturnYear01
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Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 10.81%rr_AverageAnnualReturnYear05
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Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 6.60%rr_AverageAnnualReturnYear10
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FPA Paramount Fund, Inc. | After Taxes on Distributions
 
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (11.55%)rr_AverageAnnualReturnYear01
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[2]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 8.58%rr_AverageAnnualReturnYear05
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[2]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.43%rr_AverageAnnualReturnYear10
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[2]
FPA Paramount Fund, Inc. | After Taxes on Distributions and Sale of Fund Shares
 
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (4.36%)rr_AverageAnnualReturnYear01
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[2]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 8.52%rr_AverageAnnualReturnYear05
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[2]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.24%rr_AverageAnnualReturnYear10
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[2]
[1] Management Fees are restated reflecting the fee under the Investment Advisory Agreement approved on November 15, 2013.
[2] 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 upon an investor's tax situation and may differ from those shown. After-tax returns presented here are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts ("IRAs"). Early withdrawal from a 401(k) account or an IRA could lead to taxation of the withdrawn amount as ordinary income and could be subject to an additional tax penalty.