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Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Kinetics Internet Fund
Objective [Heading] rr_ObjectiveHeading Investment Objectives
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The investment objective of the Internet Fund is long-term growth of capital.
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock
The Internet Fund seeks to obtain current income as a secondary objective.  The Internet Fund is the sole “feeder fund” to The Internet Portfolio, a series of Kinetics Portfolios Trust.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses you may pay if you buy and hold shares of the Internet Fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Transaction Expenses (fees paid directly from your investment)
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 2014-05-01
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover.
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
  The Internet Portfolio 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 Internet Portfolio’s, and therefore the Internet Fund’s, performance.  During the most recent fiscal year, the Internet Portfolio’s portfolio turnover rate was 9% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 9.00%
Expenses Represent Both Master and Feeder [Text] rr_ExpensesRepresentBothMasterAndFeeder This table and the example below reflect the aggregate expenses of the Internet Fund and the Internet Portfolio. The management fees paid by the Internet Fund reflect the proportionate share of fees allocated to the Internet Fund from the Internet Portfolio.
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 Internet Fund with the cost of investing in other mutual funds.

This Example assumes that you invest $10,000 in the Internet 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 Internet Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs for the Internet Fund would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategy
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Internet Fund is a non-diversified fund that invests all of its investable assets in the Internet Portfolio, a series of Kinetics Portfolios Trust.  Under normal circumstances, the Internet Portfolio invests at least 80% of its net assets plus any borrowings for investment purposes in common stocks, convertible securities, warrants and other equity securities having the characteristics of common stocks (such as American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”) and International Depositary Receipts (“IDRs”)), of U.S. and foreign companies engaged in the Internet and Internet-related activities and whose businesses are vastly improved through the distribution of content and reduction of costs with the use of the Internet, such as content providers, computer hardware and software, venture capital, Internet service providers, Internet portals, wireless/broadband access, e-commerce, financial service companies, auction houses, and telecommunications.  The Internet Portfolio may also invest in exchange-traded funds (“ETFs”) and write and sell options on securities in which it invests for hedging purposes and/or direct investment.

The Internet Portfolio may invest up to 20% of its total assets in convertible and non-convertible debt securities rated below investment grade, also known as junk bonds, or unrated securities which the Investment Adviser has determined to be of comparable quality.

The Investment Adviser selects portfolio securities by evaluating a company’s positioning and business model as well as its ability to grow and expand its activities via the Internet or achieve a competitive advantage in cost/profitability and brand image leveraging via use of the Internet.  The Investment Adviser also considers a company’s fundamentals by reviewing its balance sheets, corporate revenues, earnings and dividends.  Furthermore, the Investment Adviser looks at the amount of capital a company currently expends on research and development.

Sell decisions are generally triggered by either adequate value being achieved, as determined by the Investment Adviser, or by an adverse change in a company’s operating performance or a deterioration of the company’s business model.  A sell trigger may also occur if the Investment Adviser discovers a new investment opportunity that it believes is more compelling and represents a greater risk reward profile than other investment(s) held by the Internet Portfolio.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration The Internet Fund is a non-diversified fund that invests all of its investable assets in the Internet Portfolio, a series of Kinetics Portfolios Trust. Under normal circumstances, the Internet Portfolio invests at least 80% of its net assets plus any borrowings for investment purposes in common stocks, convertible securities, warrants and other equity securities having the characteristics of common stocks (such as American Depositary Receipts ("ADRs"), Global Depositary Receipts ("GDRs") and International Depositary Receipts ("IDRs")), of U.S. and foreign companies engaged in the Internet and Internet-related activities and whose businesses are vastly improved through the distribution of content and reduction of costs with the use of the Internet, such as content providers, computer hardware and software, venture capital, Internet service providers, Internet portals, wireless/broadband access, e-commerce, financial service companies, auction houses, and telecommunications.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
Investing in common stocks has inherent risks that could cause you to lose money.  The principal risks of investing in the Internet Fund, and indirectly the Internet Portfolio, are listed below and could adversely affect the net asset value (“NAV”), total return and value of the Internet Fund, Internet Portfolio and your investment.

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Stock Market Risks: Stock mutual funds are subject to stock market risks and significant fluctuations in value.  If the stock market declines in value, the Internet Portfolio, and therefore the Internet Fund, is likely to decline in value and you could lose money on your investment.

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Stock Selection Risks: The portfolio securities selected by the Investment Adviser may decline in value or not increase in value when the stock market in general is rising and may fail to meet the Internet Portfolio’s, and therefore the Internet Fund’s, investment objective.

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Liquidity Risks: The Investment Adviser may not be able to sell portfolio securities at an optimal time or price.

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Internet Industry Concentration Risks: Investing a substantial portion of the Internet Portfolio’s assets in the Internet industry carries the risk that Internet-related securities will decline in price due to Internet developments.  Companies that conduct business on the Internet or derive a substantial portion of their revenues from Internet-related activities in general are subject to a rate of change in technology and competition which is generally higher than that of other industries.

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Small and Medium-Size Company Risks: The Internet Portfolio may invest in the equity securities of small and medium-size companies.  Small and medium-size companies often have narrower markets and more limited managerial and financial resources than do larger, more established companies.  As a result, their performance can be more volatile and they face a greater risk of business failure, which could increase the volatility of the Internet Portfolio’s assets.

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Exchange-Traded Funds (ETFs):  ETFs are registered investment companies whose shares are listed and traded on U.S. stock exchanges or otherwise traded in the over-the-counter market. In general, passively-managed ETFs seek to track a specified securities index or a basket of securities that an “index provider,” such as Standard & Poor’s, selects as representative of a market, market segment or industry sector.  A passively-managed ETF is designed so that its performance will correspond closely with that of the index it tracks. As a shareholder in an ETF, the Internet Portfolio will bear its pro rata portion of an ETF’s expenses, including advisory fees, in addition to its own expenses.

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Foreign Securities Risks: The Internet Portfolio may invest in foreign securities directly or through ADRs, GDRs and IDRs.  Foreign securities can carry higher returns but involve more risks than those associated with U.S. investments.  Additional risks associated with investment in foreign securities include currency fluctuations, political and economic instability, differences in financial reporting standards and less stringent regulation of securities markets.

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Non-Diversification Risks: As a non-diversified investment company, the Internet Portfolio can invest a large percentage of its assets in a small number of issuers.  As a result, a change in the value of any one investment may affect the overall value of the Internet Portfolio’s shares, and therefore the Internet Fund’s shares, more than shares of a diversified mutual fund that holds more investments.

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Option Transaction Risks:  Purchasing and writing put and call options are highly specialized activities and entail greater than ordinary investment risks.  The successful use of options depends in part on the ability of the Investment Adviser to manage future price fluctuations and the degree of correlation between the options and securities markets.  By writing put options on equity securities, the Internet Portfolio gives up the opportunity to benefit from potential increases in the value of the common stocks above the strike prices of the written put options, but continues to bear the risk of declines in the value of its common stock portfolio.  The Internet Portfolio will receive a premium from writing a covered call option that it retains whether or not the option is exercised.  The premium received from the written options may not be sufficient to offset any losses sustained from the volatility of the underlying equity securities over time.

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Below-Investment Grade Debt Securities Risks:  Generally, non-investment grade debt securities, i.e., junk bonds, are subject to greater credit risk, price volatility and risk of loss than investment grade securities.

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Management Risk:  There is no guarantee that the Internet Fund will meet its investment objective. The Investment Adviser does not guarantee the performance of the Internet Fund, nor can it assure you that the market value of your investment will not decline.

Who may want to invest?

The Internet Fund may be appropriate for investors who:

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wish to invest for the long-term;

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want to diversify their portfolios;

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want to allocate some portion of their long-term investments to growth equity investing;

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are willing to accept the volatility associated with equity investing; and

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are comfortable with the risks described herein.
Risk Lose Money [Text] rr_RiskLoseMoney Investing in common stocks has inherent risks that could cause you to lose money.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus As a non-diversified investment company, the Internet Portfolio can invest a large percentage of its assets in a small number of issuers. As a result, a change in the value of any one investment may affect the overall value of the Internet Portfolio's shares, and therefore the Internet Fund's shares, more than shares of a diversified mutual fund that holds more investments.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The Institutional Class shares of the Internet Fund had not commenced operations as of December 31, 2011.  The performance information shown below is for another class of shares (No Load Class) of the Internet Fund that is not offered in this Prospectus but would have substantially similar annual returns because each Class of shares will be invested in the same portfolio of securities.  Annual returns will differ only to the extent that the Classes do not have the same expenses.

The bar chart and table shown below illustrate the variability of the returns for the Internet Fund’s No Load Class.  The bar chart indicates the risks of investing in the Internet Fund by showing the changes in the Internet Fund’s performance from year to year (on a calendar year basis).  The table shows how the Internet Fund’s average annual returns, before and after taxes, compare with those of the S&P 500® Index and the NASDAQ Composite® Index, both of which represent broad measures of market performance.  The past performance of the Internet Fund, before and after taxes, is not necessarily an indication of how the Internet Fund or the Internet Portfolio will perform in the future.  Updated performance information is available on the Fund’s website at http://www.kineticsfunds.com or by calling the Fund toll-free at (800) 930-3828.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table shown below illustrate the variability of the returns for the Internet Fund's No Load Class. The bar chart indicates the risks of investing in the Internet Fund by showing the changes in the Internet Fund's performance from year to year (on a calendar year basis). The table shows how the Internet Fund's average annual returns, before and after taxes, compare with those of the S&P 500 Index and the NASDAQ Composite Index, both of which represent broad measures of market performance.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess The Institutional Class shares of the Internet Fund had not commenced operations as of December 31, 2011.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone (800) 930-3828
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress http://www.kineticsfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The past performance of the Internet Fund, before and after taxes, is not necessarily an indication of how the Internet Fund or the Internet Portfolio will perform in the future.
Bar Chart [Heading] rr_BarChartHeading The Internet Fund - No Load Class Calendar Year Returns as of 12/31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter:
2009
Q2
26.04%
Worst Quarter:
2008
Q4
-21.36%
Bar Chart, Returns for Class Not Offered in Prospectus [Text] rr_BarChartReturnsForClassNotOfferedInProspectus The performance information shown below is for another class of shares (No Load Class) of the Internet Fund that is not offered in this Prospectus but would have substantially similar annual returns because each Class of shares will be invested in the same portfolio of securities. Annual returns will differ only to the extent that the Classes do not have the same expenses.
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 26.04%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.36%)
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 The Internet Fund's after-tax returns as shown in the following 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 Your actual after-tax returns depend on your tax situation and may differ from those shown. If you own Fund shares in a tax-deferred account, such as a 401(k) plan or an individual retirement account ("IRA"), the information on after-tax returns is not relevant to your investment.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for the No Load Class shares only. After-tax returns for the Institutional Class shares will differ.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock
The Internet Fund’s after-tax returns as shown in the following table are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns depend on your tax situation and may differ from those shown.  If you own Fund shares in a tax-deferred account, such as a 401(k) plan or an individual retirement account (“IRA”), the information on after-tax returns is not relevant to your investment.  After-tax returns are shown for the No Load Class shares only.  After-tax returns for the Institutional Class shares will differ.
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns as of 12/31/2012
S&P 500® Index (reflects no deductions for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel S&P 500® Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 16.00%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.66%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.10%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 6.31% [1]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Oct. 21, 1996
NASDAQ Composite® Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel NASDAQ Composite® Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 15.91%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.63%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.50%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 5.67% [1]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Oct. 21, 1996
Institutional Class
  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Management Fees rr_ManagementFeesOverAssets 1.25% [2]
Distribution (Rule 12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.20%
Other Operating Expenses rr_Component2OtherExpensesOverAssets 0.44%
Other Expenses rr_OtherExpensesOverAssets 0.64%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.89%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.20%) [3]
Net Annual Fund Operating Expenses rr_NetExpensesOverAssets 1.69%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 172
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 575
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,003
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,195
No Load Class
  
Risk/Return: rr_RiskReturnAbstract  
Annual Return 2003 rr_AnnualReturn2003 40.11%
Annual Return 2004 rr_AnnualReturn2004 10.06%
Annual Return 2005 rr_AnnualReturn2005 (1.69%)
Annual Return 2006 rr_AnnualReturn2006 16.50%
Annual Return 2007 rr_AnnualReturn2007 26.81%
Annual Return 2008 rr_AnnualReturn2008 (42.24%)
Annual Return 2009 rr_AnnualReturn2009 48.61%
Annual Return 2010 rr_AnnualReturn2010 21.18%
Annual Return 2011 rr_AnnualReturn2011 (1.98%)
Annual Return 2012 rr_AnnualReturn2012 23.24%
Label rr_AverageAnnualReturnLabel The Internet Fund (WWWFX) No Load
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 23.24%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.68%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 10.90%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 14.84% [1]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Oct. 21, 1996
No Load Class | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel The Internet Fund (WWWFX) No Load
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 22.62%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.53%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 10.70%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 14.71% [1]
No Load Class | After Taxes on Distributions and Sale of Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel The Internet Fund (WWWFX) No Load
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 15.92%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.01%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 9.68%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 13.76% [1]
[1] The Internet Fund's No Load Class shares commenced operations on October 21, 1996 and converted into a feeder fund of the Internet Portfolio on April 28, 2000. The returns for the two indices in this column have been calculated since the October 21, 1996 inception date of the Internet Fund's No Load Class shares.
[2] This table and the example below reflect the aggregate expenses of the Internet Fund and the Internet Portfolio. The management fees paid by the Internet Fund reflect the proportionate share of fees allocated to the Internet Fund from the Internet Portfolio.
[3] Kinetics Asset Management LLC, the investment adviser to the Internet Portfolio of the Kinetics Portfolio Trust (the "Investment Adviser") has contractually agreed to reimburse the Internet Fund the portion of the shareholder servicing fee in excess of 0.05% of average daily net assets until at least May 1, 2014. In addition, the Investment Adviser to the Internet Portfolio has voluntarily agreed to waive management fees and reimburse Fund expenses so that Net Annual Fund Operating Expenses do not exceed 1.69%, excluding acquired fund fees and expenses ("AFFE"), through May 1, 2014. These waivers and reimbursements may be discontinued at any time by the Investment Adviser after May 1, 2014.