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No Load Class Prospectus | Kinetics Global Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Kinetics Global Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The investment objective of the Global Fund is long-term growth of capital.  The Global Fund is the sole “feeder fund” to The Global 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 Global 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 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 01, 2018
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover.
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Global 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 Global Portfolio’s, and therefore the Global Fund’s, performance.  During the most recent fiscal year, the Global Portfolio’s portfolio turnover rate was 11% of the average value of its portfolio.          
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 11.00%
Expenses Represent Both Master and Feeder [Text] rr_ExpensesRepresentBothMasterAndFeeder This table and the example below reflect the aggregate expenses of the Global Fund and the Global Portfolio. The management fees paid by the Global Fund reflect the proportionate share of fees allocated to the Global Fund from the Global Portfolio.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Total Annual Fund Operating Expenses do not correlate to the ratio of operating expenses to average net assets before expense reimbursement found in the “Financial Highlights” section of this Prospectus, which reflects the Global Fund’s operating expenses and does not include acquired fund fees and expenses (“AFFE”).
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 No Load Class shares of the Global Fund with the cost of investing in other mutual funds.  This Example assumes that you invest $10,000 in the Global Fund for the time periods indicated and then redeem all of your shares at the end of these periods.  The Example also assumes that your investment has a 5% return each year and that the Global Fund’s operating expenses remain the same (taking into account the expense limitation only in the first year).
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your cost for the Global Fund would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategy
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Global Fund is a diversified fund that invests all of its investable assets in the Global Portfolio, a series of Kinetics Portfolios Trust.  Under normal circumstances, the Global Portfolio invests at least 65% of its net assets plus any borrowings for investment purposes in common stocks, exchange traded funds (“ETFs”), 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 foreign and U.S. companies listed on publicly traded exchanges. At least 40%, of the Global Portfolio’s net assets, will be invested in companies located outside the U.S.   The Global Portfolio will at all times have exposure to at least three (3) countries, which may include the U.S.  The Global Portfolio may also purchase and write options for hedging purposes and/or direct investment and invest in participatory notes (commonly known as “P-notes”) to take positions in certain foreign securities.

The Global 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 that the Investment Adviser has determined to be of comparable quality. The Global Portfolio may invest up to 100% of its assets in companies located in emerging markets.

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 or achieve a greater competitive advantage in cost/profitability and brand image leveraging.  This evaluation by the Investment Adviser includes consideration of a company’s potential to maintain and grow long lived assets, while generating high returns on capital with operating predictability and transparency.  The Investment Adviser also considers a company’s fundamentals by reviewing its balance sheets, corporate revenues, earnings and dividends.  The Global Portfolio may invest in companies of any size, including small and medium-sized companies.  Additionally, the Global Portfolio may participate in securities lending arrangements up to 33-1/3% of the securities in its portfolio with brokers, dealers, and financial institutions (but not individuals) in order to increase the return on its portfolio.

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 Global Portfolio.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
The Global Portfolio’s investments, including common stocks, have inherent risks that could cause you to lose money.  The principal risks of investing in the Global Fund, and indirectly the Global Portfolio, are listed below and could adversely affect the net asset value (“NAV”), total return and value of the Global Fund, Global Portfolio and your investment.

»
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 Global Portfolio, and therefore the Global Fund, is likely to decline in value and you could lose money on your investment.

»
Counterparty Risks: Transactions involving a counterparty are subject to the credit risk of the counterparty. A Portfolio that enters into contracts with counterparties, such as repurchase or reverse repurchase agreements or over-the-counter (“OTC”) derivatives contracts, or that lends its securities run the risk that the counterparty will be unable or unwilling to make timely settlement payments or otherwise honor its obligations. If a counterparty fails to meet its contractual obligations, goes bankrupt, or otherwise experiences a business interruption, the Portfolio could suffer losses, including monetary losses, miss investment opportunities or be forced to hold investments it would prefer to sell. Counterparty risk is heightened during unusually adverse market conditions.

» 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 Global Portfolio’s, and therefore the Global Fund’s, investment objective.

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

» Small and Medium-Size Company Risks: The Global 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 Global Portfolio’s assets.

» Exchange-Traded Funds (ETFs) Risks: 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.  A leveraged ETF will engage in transactions and purchase instruments that give rise to forms of leverage, including, among others, the use of reverse repurchase agreements and other borrowings, the investment of collateral from loans of portfolio securities, the use of when issued, delayed-delivery or forward commitment transactions or short sales.  To the extent a fund invests in ETFs that achieve leveraged exposure to their underlying indexes through the use of derivative instruments, the fund will indirectly be subject to leveraging risk.  As a shareholder in an ETF, the Global Portfolio will bear its pro rata portion of an ETF’s expenses, including advisory fees, in addition to its own expenses.

» Foreign Securities Risks: The Global 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.

» Interest Rate Risk: The risk that when interest rates increase, fixed-income securities held by the Global Portfolio will decline in value.  Long-term fixed-income securities will normally have more price volatility because of this risk than short-term fixed-income securities.  It is likely there will be less governmental action in the near future to maintain low interest rates.  The negative impact on fixed income securities from the resulting rate increases for that and other reasons could be swift and significant.

» Leveraging Risks: Investments in derivative instruments may give rise to a form of leverage. The Investment Adviser may engage in speculative transactions, which involve substantial risk and leverage. The use of leverage by the Investment Adviser may increase the volatility of the Global Portfolio. These leveraged instruments may result in losses to the Global Portfolio or may adversely affect the Global Portfolio’s NAV or total return, because instruments that contain leverage are more sensitive to changes in interest rates. The Global Portfolio may also have to sell assets at inopportune times to satisfy its obligations in connection with such transactions.

» 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 Global 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 Global 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.

» Below Investment Grade Debt Securities Risks: Generally, below investment grade debt securities, i.e., junk bonds, are subject to greater credit risk, price volatility and risk of loss than investment grade securities. Junk bonds are considered to be speculative in nature.

»
Convertible Securities Risks: Convertible securities are subject to the risks affecting both equity and fixed income securities, including market, credit, liquidity and interest rate risk.

»
Participatory Notes Risks: The return on a participatory note (“P-note”) is linked to the performance of the issuers of the underlying securities. In addition, P-notes are subject to liquidity risk.

» Emerging Markets Risks: The risk that the securities markets of emerging countries are less liquid, are especially subject to greater price volatility, have smaller market capitalizations, have less government regulation and are not subject to as extensive and frequent accounting, financial and other reporting requirements as the securities markets of more developed countries as have historically been the case.

» Derivatives Risks: The Global Portfolio’s investments in P-notes and other derivative instruments may result in loss.  Derivative instruments may be illiquid, difficult to price and leveraged so that small changes may produce disproportionate losses to the Global Portfolio.

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

Who may want to invest?

The Global Fund may be appropriate for investors who:

» wish to invest for the long-term;

» want to diversify their portfolios;

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

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

» are comfortable with the risks described herein.
Risk Lose Money [Text] rr_RiskLoseMoney The Global Portfolio’s investments, including common stocks, have inherent risks that could cause you to lose money.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table shown below illustrate the variability of the Global Fund’s returns.  The bar chart indicates the risks of investing in the Global Fund by showing the changes in the Global Fund’s performance from year to year (on a calendar year basis).  The table shows how the Global Fund’s average annual returns, before and after taxes, compare with those of the S&P® 500 Index and the MSCI ACWI (All Country World Index) Index (“MSCI ACWI Index”), which represent broad measures of market performance.  As of March 14, 2008, the Global Fund and the Global Portfolio, which were formerly known as the Internet Emerging Growth Fund and the Internet Emerging Growth Portfolio, respectively, changed to the investment strategy set forth in this Prospectus.  The performance shown for the periods or portion of periods prior to March 14, 2008 represents performance of the Global Portfolio’s prior strategy to invest at least 80% of its net assets plus any borrowings for investment purposes in equity securities of small and medium-capitalization U.S. and foreign companies engaged in the Internet and Internet-related activities.  The past performance of the Global Fund, before and after taxes, is not necessarily an indication of how the Global Fund or the Global 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 indicates the risks of investing in the Global Fund by showing the changes in the Global Fund’s performance from year to year (on a calendar year basis).
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 Global Fund, before and after taxes, is not necessarily an indication of how the Global Fund or the Global Portfolio will perform in the future.
Bar Chart [Heading] rr_BarChartHeading The Global Fund – No Load Class Calendar Year Returns as of 12/31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter:
2009
Q2
37.66%
Worst Quarter:
2008
Q3
-20.53%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 37.66%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (20.53%)
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 Global 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 Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher The Return After Taxes on Distributions and Sale of Fund Shares is higher than other return figures when a capital loss occurs upon the redemption of Fund shares.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock
The Global 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.  The Return After Taxes on Distributions and Sale of Fund Shares is higher than other return figures when a capital loss occurs upon the redemption of Fund shares.
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns as of 12/31/2016
No Load Class Prospectus | Kinetics Global Fund | 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 deductions for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 11.96%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 14.66%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 6.95%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 4.51% [1]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 1999
No Load Class Prospectus | Kinetics Global Fund | MSCI ACWI Index (reflects no deductions for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel MSCI ACWI Index (reflects no deductions for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 7.86%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 9.36%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.56%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.18% [1]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 1999
No Load Class Prospectus | Kinetics Global Fund | No Load Class  
Risk/Return: rr_RiskReturnAbstract  
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 0.25%
Other Operating Expenses rr_Component2OtherExpensesOverAssets 1.54%
Other Expenses rr_OtherExpensesOverAssets 1.79%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 3.06% [3]
Less: Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (1.65%) [4]
Net Annual Fund Operating Expenses rr_NetExpensesOverAssets 1.41%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 144
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 790
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,462
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 3,258
Annual Return 2007 rr_AnnualReturn2007 4.27%
Annual Return 2008 rr_AnnualReturn2008 (50.72%)
Annual Return 2009 rr_AnnualReturn2009 66.86%
Annual Return 2010 rr_AnnualReturn2010 20.30%
Annual Return 2011 rr_AnnualReturn2011 (15.41%)
Annual Return 2012 rr_AnnualReturn2012 23.16%
Annual Return 2013 rr_AnnualReturn2013 28.59%
Annual Return 2014 rr_AnnualReturn2014 (11.89%)
Annual Return 2015 rr_AnnualReturn2015 (13.83%)
Annual Return 2016 rr_AnnualReturn2016 14.40%
Label rr_AverageAnnualReturnLabel The Global Fund (WWWEX) No Load Return Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 14.40%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 6.58%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.84%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (2.32%) [1]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 1999
No Load Class Prospectus | Kinetics Global Fund | No Load Class | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel The Global Fund (WWWEX) No Load Return After Taxes on Distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 14.29%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 6.44%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.62%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (2.63%) [1]
No Load Class Prospectus | Kinetics Global Fund | No Load Class | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel The Global Fund (WWWEX) No Load Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 8.24%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.16%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.48%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (1.72%) [1]
[1] The Global Fund's No Load Class shares commenced operations on December 31, 1999 and converted into a feeder fund of the Global Portfolio on April 28, 2000. The returns for the indices in this column have been calculated since the December 31, 1999 inception date of the Global Fund's No Load Class shares.
[2] This table and the example below reflect the aggregate expenses of the Global Fund and the Global Portfolio. The management fees paid by the Global Fund reflect the proportionate share of fees allocated to the Global Fund from the Global Portfolio.
[3] Total Annual Fund Operating Expenses do not correlate to the ratio of operating expenses to average net assets before expense reimbursement found in the "Financial Highlights" section of this Prospectus, which reflects the Global Fund's operating expenses and does not include acquired fund fees and expenses ("AFFE").
[4] Kinetics Asset Management LLC, the investment adviser to the Global Portfolio of the Kinetics Portfolio Trust (the "Investment Adviser"), has agreed to waive management fees and reimburse Fund expenses so that Net Annual Fund Operating Expenses do not exceed 1.39%, excluding AFFE. These waivers and reimbursements are in effect until May 1, 2018, and may not be terminated without the approval of the Board.