Objective, Primary [Text Block]

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Risk/Return [Heading]

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Kinetics Alternative Income Fund

Objective [Heading]

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Investment Objectives

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The primary investment objective of the Alternative Income Fund is to provide current income and gains.

Objective, Secondary [Text Block]

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The Alternative Income Fund seeks to obtain long-term growth of capital as a secondary objective. The Alternative Income Fund is the sole “feeder fund” to The Alternative Income Portfolio, a series of Kinetics Portfolios Trust.

Expense [Heading]

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Fees and Expenses of the Fund

Expense Narrative [Text Block]

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

Shareholder Fees Caption [Text]

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SHAREHOLDER FEES (fees paid directly from your investment)

Operating Expenses Caption [Text]

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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

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May 01, 2018

Portfolio Turnover [Heading]

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Portfolio Turnover.

Portfolio Turnover [Text Block]

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The Alternative Income 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 Alternative Income Portfolio’s, and therefore the Alternative Income Fund’s, performance. During the most recent fiscal year, the Alternative Income Portfolio’s portfolio turnover rate was 1% of the average value of its portfolio.

Portfolio Turnover, Rate

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1.00%

Expenses Represent Both Master and Feeder [Text]

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This table and the example below reflect the aggregate expenses of the Alternative Income Fund and the Alternative Income Portfolio. The management fees paid by the Alternative Income Fund reflect the proportionate share of fees allocated to the Alternative Income Fund from the Alternative Income Portfolio.

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

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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 Alternative Income Fund’s operating expenses and does not include acquired fund fees and expenses (“AFFE”).

Expense Example [Heading]

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Example.

Expense Example Narrative [Text Block]

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This Example is intended to help you compare the cost of investing in the Alternative Income Fund with the cost of investing in other mutual funds. This Example assumes that you invest $10,000 in the Alternative Income 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 Alternative Income Fund’s operating expenses remain the same (taking into account the expense limitations only in the first year).

Expense Example by, Year, Caption [Text]

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Although your actual costs may be higher or lower, based on these assumptions your cost for the Alternative Income Fund would be:

Strategy [Heading]

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Principal Investment Strategy

Strategy Narrative [Text Block]

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The Alternative Income Fund is a diversified fund that invests all of its investable assets in the Alternative Income Portfolio, a series of Kinetics Portfolios Trust. Under normal circumstances, the Alternative Income Portfolio will hold a portfolio of primarily fixed income securities, and conditions permitting, and implement an equity put writing option strategy intended to generate returns from the receipt of option premiums. The Alternative Income Portfolio will thereby only be able to seek to fulfill its primary investment objective of generating current income and gains by collecting premiums on written put options while maintaining a portfolio of primarily fixed income securities that serve as collateral to cover obligations pursuant to the written options. In addition to writing options when appropriate, the Alternative Income Portfolio may also purchase options in certain circumstances. The Alternative Income Portfolio’s secondary objective is to achieve long-term growth of capital.

The Alternative Income Portfolio implements option strategies on market indexes, exchange-traded funds (“ETFs”) or company specific equity securities, receiving up-front cash payments from the purchasers of these options in exchange for providing the purchasers with the right to potentially sell an underlying security to the Alternative Income Portfolio. If the prevailing market value of the underlying equity securities on an expiration date exceeds the exercise price of the put option that the Alternative Income Portfolio has written, it is expected that the option will not be exercised. In such instance, the Alternative Income Portfolio would not be required to purchase any securities and the received premium would be considered income.

At the time of writing (selling) a put option, the aggregated amount of all the notional obligations of the option positions (the sum of all the exercise prices referenced) held by the Alternative Income Portfolio may not exceed 100% of the Alternative Income Portfolio’s total assets. In this way, the Alternative Income Portfolio intends to have available at all times cash or fixed income investments to satisfy any obligations to purchase securities pursuant to options written.

The Investment Adviser selects option investments based on market volatility levels, underlying security valuations and perceived market risks. Further, the Investment Adviser evaluates relative option premiums and implied volatilities in determining preferred option contract terms, such as exercise prices and expiration dates. The Alternative Income Portfolio will typically buy or sell exchange-traded options on market indexes, diversified and non-diversified ETFs, real estate investment trusts (“REITs”), convertible securities and U.S. listed stocks of individual companies. The Alternative Income Portfolio may also invest in foreign securities, including up to 100% in emerging markets, directly or through American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”) and International Depositary Receipts (“IDRs”). To the extent the Alternative Income Portfolio buys or sells options on single stock equity securities, the aggregate notional exposure to a specific underlying company will typically not exceed 5% of the Alternative Income Portfolio’s net assets at the time of investment.

To satisfy collateral requirements related to the use of derivatives and provide full coverage of potential security purchase obligations related to written options, the Alternative Income Portfolio may invest up to 100% of its net assets in fixed income securities including cash or cash equivalents, fixed income closed-end funds (“CEFs”) and ETFs. There are no limitations as to the maturities or credit ratings of the fixed income securities in which the Alternative Income Portfolio may invest, however, fixed income securities held by the Alternative Income Portfolio are generally issued by the U.S. Government or investment grade, large capitalization U.S. companies.

In managing the Alternative Income Portfolio’s fixed income holdings, the Investment Adviser focuses on achieving a reasonable risk-adjusted return with an emphasis on capital preservation, while seeking long term growth of capital. The Investment Adviser will select fixed income securities based on market liquidity, duration risk, credit risk, and yield to maturity.

In connection with the Alternative Income Portfolio’s positions in derivatives, the Alternative Income Portfolio segregates liquid assets or will otherwise cover its position in accordance with applicable U.S. Securities and Exchange Commission (“SEC”) requirements. Additionally, the Alternative Income 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.

Risk [Heading]

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Principal Investment Risks

Risk Narrative [Text Block]

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Investing in common stocks has inherent risks that could cause you to lose money. The principal risks of investing in the Alternative Income Fund, and indirectly the Alternative Income Portfolio, are listed below and could adversely affect the net asset value (“NAV”), total return and the value of the Alternative Income Fund, Alternative Income Portfolio and your investment.

Management Risks: The Alternative Income 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 Alternative Income Portfolio’s, and therefore the Alternative Income Fund’s, investment objective. The Investment Adviser cannot guarantee the performance of the Alternative Income Fund, nor can it assure you that the market value of your investment will not decline.

Liquidity Risks: The Alternative Income Portfolio’s investments in options and, to the extent it invests in certain non-investment grade fixed income securities, including CEFs or ETFs, makes the Alternative Income Portfolio especially susceptible to the risk that during certain periods the liquidity of certain issuers or industries, or all securities within particular investment categories, will decrease or disappear suddenly and without warning as a result of adverse market or political events, or adverse investor perceptions.

Security Selection Risks: The Alternative Income 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 Alternative Income Portfolio’s, and therefore the Alternative Income Fund’s, investment objective.

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. Conversely, actively-managed ETFs seek an investment objective by investing in a basket of securities based on the investment strategy and discretion of the ETF’s adviser. 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 Alternative Income 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 Alternative Income 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.

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.

Interest Rate Risk: The risk that when interest rates increase, fixed-income securities held by the Alternative Income 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.

»	Credit/Default Risk: The risk that an issuer or guarantor of fixed-income securities held by the Alternative Income Portfolio (which may have low credit ratings), or the counterparty in a derivative investment, may default on its obligation to pay interest and repay principal.

Derivatives Risks: The Alternative Income Portfolio’s investments in options 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 Alternative Income Portfolio. If a secondary market does not exist for an option purchased or written by the Alternative Income Portfolio, it might not be possible to effect a closing transaction in the option (i.e., dispose of the option), with the result that (1) an option purchased by the Alternative Income Portfolio would have to be exercised in order for the Alternative Income Portfolio to realize any profit and (2) the Alternative Income Portfolio may not be able to sell portfolio securities covering an option written by it until the option expires or it delivers the underlying security, upon exercise. To the extent the Alternative Income Portfolio segregates assets to cover derivative positions, the Alternative Income Portfolio may impair its ability to meet current obligations, to honor requests for redemption and to manage the Alternative Income Portfolio properly in a manner consistent with its stated investment objective.

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 Alternative Income Portfolio. These leveraged instruments may result in losses to the Alternative Income Portfolio or may adversely affect the Alternative Income Portfolio’s NAV or total return, because instruments that contain leverage are more sensitive to changes in interest rates. The Alternative Income 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 (or currency) markets. By writing put options on equity securities, the Alternative Income Portfolio gives up the opportunity to benefit from potential increases in the value of the common stocks above the exercise prices of the written put options, but continues to bear the risk of declines in the value of its common stock portfolio. The Alternative Income 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.

REITs Risks: REITs may be affected by economic forces and other factors related to the real estate industry. Investing in REITs may involve risks similar to those associated with investing in small capitalization companies. REITs may have limited financial resources, may trade less frequently and in a limited volume and may be subject to more abrupt or erratic price movements than larger company securities. Historically, small capitalization stocks, such as REITs, have been more volatile in price than the larger capitalization stocks included in the S&P 500^® Index.

»	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.

Who may want to invest?

The Alternative Income Fund may be appropriate for investors who:

»	wish to diversify their portfolios;

»	wish to generate income and capital; and

»	are comfortable with the risks described herein.

Risk Lose Money [Text]

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Investing in common stocks has inherent risks that could cause you to lose money.

Bar Chart and Performance Table [Heading]

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Performance

Performance Narrative [Text Block]

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The bar chart and table shown below illustrate the variability of the Alternative Income Fund’s returns. The bar chart indicates the risks of investing in the Alternative Income Fund by showing the changes in the Alternative Income Fund’s performance from year to year (on a calendar year basis). The table shows how the Alternative Income Fund’s average annual returns, before and after taxes, compared with those of the Bloomberg Barclays U.S. 1-3 Year Credit Bond Index and the Bloomberg Barclays U.S. Aggregate Bond Index, which represent broad measures of market performance. The past performance of the Alternative Income Fund, before and after taxes, is not necessarily an indication of how the Alternative Income Fund or the Alternative Income 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.

Important note about performance reflecting the Fund’s prior investment strategy. The performance shown for periods prior to January 1, 2013 reflects a previous investment objective and strategy. The Fund sought long-term growth of capital as its primary investment objective with a secondary objective to obtain current income while investing at least 80% of its assets in securities of companies engaged in water infrastructure and natural resources with a specific water theme and related activities. Effective January 1, 2013, the Fund’s performance reflects the significantly different investment objective of seeking to generate income and capital gains with long-term growth of capital as its secondary investment objective while investing in primarily fixed income securities while utilizing an options strategy.

Performance Information Illustrates Variability of Returns [Text]

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The bar chart indicates the risks of investing in the Alternative Income Fund by showing the changes in the Alternative Income Fund’s performance from year to year (on a calendar year basis).

Performance Availability Phone [Text]

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(800) 930-3828

Performance Availability Website Address [Text]

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http://www.kineticsfunds.com

Performance Past Does Not Indicate Future [Text]

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The past performance of the Alternative Income Fund, before and after taxes, is not necessarily an indication of how the Alternative Income Fund or the Alternative Income Portfolio will perform in the future.

Bar Chart [Heading]

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The Alternative Income Fund – Institutional Class Calendar Year Returns as of 12/31

Bar Chart Closing [Text Block]

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Best Quarter:	2009	Q2	17.97%
Worst Quarter:	2011	Q3	-14.07%

Highest Quarterly Return, Label

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Best Quarter:

Highest Quarterly Return, Date

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Jun. 30, 2009

Highest Quarterly Return

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17.97%

Lowest Quarterly Return, Label

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Worst Quarter:

Lowest Quarterly Return, Date

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Sep. 30, 2011

Lowest Quarterly Return

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(14.07%)

Index No Deduction for Fees, Expenses, Taxes [Text]

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(reflects no deductions for fees, expenses or taxes)

Performance Table Uses Highest Federal Rate

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Performance Table Not Relevant to Tax Deferred

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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

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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

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The Alternative Income 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

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Average Annual Total Returns as of 12/31/2016

Institutional Class Prospectus | Kinetics Alternative Income Fund | Bloomberg Barclays U.S. 1-3 Year Credit Bond Index (reflects no deductions for fees, expenses or taxes)

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Bloomberg Barclays U.S. 1-3 Year Credit Bond Index (reflects no deductions for fees, expenses or taxes)

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2.11%

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1.84%

Average Annual Returns, Inception Date

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3.18%

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Jun. 29, 2007

Institutional Class Prospectus | Kinetics Alternative Income Fund | Bloomberg Barclays U.S. Aggregate Bond Index (reflects no deductions for fees, expenses or taxes)

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Bloomberg Barclays U.S. Aggregate Bond Index (reflects no deductions for fees, expenses or taxes)

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2.65%

rr_AverageAnnualReturnYear05

2.23%

Average Annual Returns, Inception Date

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4.47%

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Jun. 29, 2007

Institutional Class Prospectus | Kinetics Alternative Income Fund | Institutional Class

Redemption Fee (as a percentage of Amount Redeemed)

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(2.00%)

Management Fees

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0.90%

^[1]

Distribution (Rule 12b-1) Fees

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none

Shareholder Servicing Fees

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0.20%

Other Operating Expenses

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0.63%

Other Expenses

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0.83%

Acquired Fund Fees and Expenses

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0.04%

Total Annual Fund Operating Expenses

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1.77%

^[2]

Less: Fee Waiver

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(0.98%)

^[3]

Net Annual Fund Operating Expenses

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0.79%

Expense Example, with Redemption, 1 Year

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$ 81

Expense Example, with Redemption, 3 Years

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462

Expense Example, with Redemption, 5 Years

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867

Expense Example, with Redemption, 10 Years

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$ 2,003

Annual Return 2008

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(25.05%)

Annual Return 2009

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16.94%

Annual Return 2010

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(4.38%)

Annual Return 2011

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(4.43%)

Annual Return 2012

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10.17%

Annual Return 2013

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5.39%

Annual Return 2014

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1.72%

Annual Return 2015

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3.09%

Annual Return 2016

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4.22%

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The Alternative Income Fund (KWIIX) Institutional Return Before Taxes

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4.22%

rr_AverageAnnualReturnYear05

4.88%

Average Annual Returns, Inception Date

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0.46%

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Jun. 29, 2007

Institutional Class Prospectus | Kinetics Alternative Income Fund | Institutional Class | After Taxes on Distributions

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The Alternative Income Fund (KWIIX) Institutional Return After Taxes on Distributions

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4.17%

rr_AverageAnnualReturnYear05

4.66%

Institutional Class Prospectus | Kinetics Alternative Income Fund | Institutional Class | After Taxes on Distributions and Sale of Fund Shares

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0.22%

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The Alternative Income Fund (KWIIX) Institutional Return After Taxes on Distributions and Sale of Fund Shares

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2.39%

rr_AverageAnnualReturnYear05

3.71%