This table describes the fees and expenses that you may pay if you buy and hold shares of the Series. The table below does not take into account any of the expenses associated with an investment in variable insurance products offered by participating insurance companies. If such fees and expenses were reflected, the overall expenses would be higher.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

SHAREHOLDER FEES (fees paid directly from your investment)

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

ANNUAL OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

1.25%

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

1.46%

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

2.71%

^[1]

Fee Waiver or Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.36%)

^[2]

Net Expenses (as a percentage of Assets)

rr_NetExpensesOverAssets

2.35%

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

PORTFOLIO TURNOVER

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Series 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. These costs, which are not reflected in annual operating expenses or in the example, affect the Series’ performance. During the most recent fiscal year, the Series’ portfolio turnover rate was 0% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

0.00%

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 Series with the cost of investing in other mutual funds. It does not reflect separate account or insurance contract fees and charges, which if reflected would increase expenses.

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

The Example assumes that you invest $10,000 in the Series for the time periods indicated and reflects expenses whether or not you redeem your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Series’ operating expenses remain the same. Although the actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

238

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

807

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,403

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

3,015

Expense Example Closing [Text Block]

rr_ExpenseExampleClosingTextBlock

The above Example reflects applicable contractual fee waiver/expense reimbursement arrangements for the duration of the arrangements only.

Strategy [Heading]

rr_StrategyHeading

PRINCIPAL INVESTMENT STRATEGIES

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Series Z (Alpha Opportunity Series) pursues its objective by investing, under normal market conditions, in long and short positions of domestic equity and equity-related securities (including swaps and other derivative investments giving long or short exposure to domestic equity securities).

The Investment Manager uses a proprietary evaluation process to generate an expected return for individual stocks that considers market risks generally and risks specific to the companies in which the Series invests. Market risk factors include, among other factors, company size, enterprise value, and sector. The Investment Manager seeks to construct portfolios of equity-related exposures that maintain long positions in risk factors that the Investment Manager considers to be undervalued by the equity markets and sells short risk factors that the Investment Manager considers to be overvalued. The process uses fundamentally-based, forward-looking forecasts of equity cash flows to generate return expectations for individual stocks. Then, the expected returns for the universe of stocks is further evaluated using quantitative techniques to estimate the market’s implied valuation of broad market risk factors as well as the company-specific risks unique to each company. Finally, a portfolio is constructed within guidelines that buys long the stocks (or derivatives that give exposure to stocks) that give the portfolio both the broad risk characteristics and company-specific risks that are perceived to be undervalued and sells short stocks (or derivatives that give exposure to stocks) for which those characteristics are perceived to be overpriced. “Alpha” in the Series’ name refers to the potential for the Series’ portfolio to achieve returns that are favorable relative to the amount of risk taken. Of course, there is no guarantee that the Series will achieve its objective of long-term growth of capital, and an investment in the Series involves significant risk.

The Series will ordinarily hold simultaneous long and short positions in equity securities or securities markets that provide exposure up to a level equal to 150% of the Series' net assets for both the long and short positions. That level of exposure is obtained through derivatives, including swap agreements. The Investment Manager intends to maintain a low overall net exposure (the difference between the notional value of long positions and the notional value of short positions) for the portfolio, typically varying between 50% net long and 30% net short in order to maintain low correlation to traditional equity markets, lower than market volatility and seek to provide consistent absolute return. The overall net exposure will change as market opportunities change, and may, based on the Investment Manager’s view of current market conditions, be outside this range.

The Series may invest in domestic equity securities, including small-, mid-, and large-capitalization securities. The Series also may invest in derivative instruments, including swaps on selected baskets of equity securities, to enable the Series to pursue its investment objective without investing directly in the securities of companies to which the Series is seeking exposure. The Series may also invest in derivatives to hedge or gain leveraged exposure to a particular sector, industry, risk factor, or company depending on market conditions. The Series will often invest in instruments traded in the over the-counter (“OTC”) market, which generally provides for less transparency than exchange-traded derivative instruments. The Series also may enter into long positions or short sales of broad-based stock indices for hedging purposes in an effort to reduce the Series’ risk or volatility. The use of derivatives may create a leveraging effect on the Series which will force the Series to take offsetting positions or earmark or segregate assets to be used as collateral. The Series actively trades its investments without regard to the length of time they have been owned by the Series, which results in higher portfolio turnover.

While the Series anticipates investing in these securities and instruments to seek to achieve its investment objective, the extent of the Series’ investment in these instruments may vary from day-to-day depending on a number of different factors, including price, availability, and general market conditions. On a day-to-day basis, the Series may hold U.S. government securities, short-term, high quality (rated AA or higher) fixed-income securities, money market instruments, overnight and fixed-term repurchase agreements, cash and other cash equivalents with maturities of one year or less to collateralize its derivative positions or for defensive purposes to seek to avoid losses during adverse market conditions. The Series also may enter into repurchase agreements with counterparties that are deemed to present acceptable credit risks.

Under adverse market conditions, the Series may make temporary defensive investments and may be unable to pursue or achieve its investment objective during that time.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

The value of an investment in the Series will fluctuate and is subject to investment risks, which means investors could lose money. The principal risks of investing in the Series are summarized below.

Counterparty Credit Risk—The Series makes investments in financial instruments and OTC-traded derivatives involving counterparties to gain exposure to a particular group of securities, index or asset class without actually purchasing those securities or investments, or to hedge a position. Through these investments, the Series is exposed to credit risks that the counterparty may be unwilling or unable to make timely payments to meet its contractual obligations or may fail to return holdings that are subject to the agreement with the counterparty. If the counterparty becomes bankrupt or defaults on its payment obligations to the Series, the Series may not receive the full amount that it is entitled to receive. If this occurs, the value of your shares in the Series will decrease.

Credit Risk—The Series could lose money if the issuer or guarantor of a fixed-income instrument or a counterparty to a derivatives transaction or other transaction is unable or unwilling, or perceived to be unable or unwilling, to pay interest or repay principal on time or defaults. The issuer, guarantor or counterparty could also suffer a rapid decrease in credit quality rating, which would adversely affect the volatility of the value and liquidity of the instrument.

Derivatives Risk—Derivatives may pose risks in addition to and greater than those associated with investing directly in securities or other investments, including risks relating to leverage, imperfect correlations with underlying investments or the Series’ other portfolio holdings, high price volatility, lack of availability, counterparty credit, liquidity, valuation and legal restrictions. Their use is a highly specialized activity that involves investment techniques and risks different from those associated with ordinary portfolio securities transactions. The Series’ use of derivatives to obtain short exposure may result in greater volatility. If the Investment Manager is incorrect about its expectations of market conditions, the use of derivatives could also result in a loss, which in some cases may be unlimited. Some of the derivatives in which the Series invests are traded (and privately negotiated) in the over-the-counter ("OTC") market. OTC derivatives are subject to heightened credit, liquidity and valuation risks. Certain risks also are specific to the derivatives in which the Series invests.

Swap Agreements Risk—Swap agreements are contracts among the Series and a counterparty to exchange the return of the pre-determined underlying investment (such as the rate of return of the underlying index). Swap agreements may be negotiated bilaterally and traded OTC between two parties or, in some instances, must be transacted through a futures commission merchant and cleared through a clearinghouse that serves as a central counterparty. Risks associated with the use of swap agreements are different from those associated with ordinary portfolio securities transactions, due in part to the fact they could be considered illiquid and many swaps trade on the OTC market. Swaps are particularly subject to counterparty credit, correlation, valuation, liquidity and leveraging risks. Certain standardized swaps are subject to mandatory central clearing. Central clearing is intended to reduce counterparty credit risk and increase liquidity, but central clearing does not make swap transactions risk-free.

Futures Contracts Risk—Futures contracts are typically exchange-traded contracts that call for the future delivery of an asset at a certain price and date, or cash settlement of the terms of the contract. Risks of futures contracts may be caused by an imperfect correlation between movements in the price of the instruments and the price of the underlying securities. In addition, there is the risk that the Series may not be able to enter into a closing transaction because of an illiquid market. Exchanges can limit the number of positions that can be held or controlled by the Series or its Investment Manager, thus limiting the ability to implement the Series’ strategies. Futures markets are highly volatile and the use of futures may increase the volatility of the Series’ NAV. Futures are also subject to leverage risks and to liquidity risk.

Options Risk—Options or options on futures contracts give the holder of the option the right to buy (or to sell) a position in a security or in a contract to the writer of the option, at a certain price. They are subject to correlation risk because there may be an imperfect correlation between the options and the securities markets that cause a given transaction to fail to achieve its objectives. The successful use of options depends on the Investment Manager’s ability to predict correctly future price fluctuations and the degree of correlation between the options and securities markets. Exchanges can limit the number of positions that can be held or controlled by the Series or its Investment Manager, thus limiting the ability to implement the Series’ strategies. Options are also particularly subject to leverage risk and can be subject to liquidity risk.

Equity Securities Risk—Equity securities include common stocks and other equity securities (and securities convertible into stocks), and the prices of equity securities fluctuate in value more than other investments. They reflect changes in the issuing company’s financial condition and changes in the overall market. Common stocks generally represent the riskiest investment in a company. The Series may lose a substantial part, or even all, of its investment in a company’s stock. Growth stocks may be more volatile than value stocks.

Interest Rate Risk—Investments in fixed-income securities are subject to the possibility that interest rates could rise sharply, causing the value of the Series’ securities and share price to decline. The risks associated with rising interest rates are heightened given the historically low interest rate environment. Fixed-income securities with longer durations are subject to more volatility than those with shorter durations.

Leverage Risk—The Series’ use of leverage, through borrowings or instruments such as derivatives, may cause the Series to be more volatile and riskier than if it had not been leveraged.

Liquidity and Valuation Risk—In certain circumstances, it may be difficult for the Series to purchase and sell particular investments within a reasonable time at a fair price, or the price at which it has been valued by the Investment Manager for purposes of the Series’ net asset value, causing the Series to be less liquid and unable to realize what the Investment Manager believes should be the price of the investment.

Management Risk—The Series is actively managed, which means that investment decisions are made based on investment views. There is no guarantee that the investment views will produce the desired results or expected returns, causing the Series to fail to meet its investment objective or underperform its benchmark index or funds with similar investment objectives and strategies. Furthermore, active trading that can accompany active management, also called “high turnover,” may have a negative impact on performance. Active trading may result in higher brokerage costs or mark-up charges, which are ultimately passed on to shareholders of the Series.

Market Risk—The value of, or income generated by, the securities held by the Series may fluctuate rapidly and unpredictably as a result of factors affecting individual companies or changing economic, political, social or financial market conditions throughout the world because of the interconnected global economies and financial markets.

Regulatory and Legal Risk—U.S. and other regulators and governmental agencies may implement additional regulations and legislators may pass new laws that affect the investments held by the Series, the strategies used by the Series or the level of regulation applying to the Series (such as regulations related to investments in derivatives). These may impact the investment strategies, performance, costs and operations of the Series.

Repurchase Agreement and Reverse Repurchase Agreement Risk—In the event of the insolvency of the counterparty to a repurchase agreement or reverse repurchase agreement, recovery of the repurchase price owed to the Series or, in the case of a reverse repurchase agreement, the securities sold by the Series, may be delayed. Because reverse repurchase agreements may be considered to be the practical equivalent of borrowing funds, they constitute a form of leverage. If the Series reinvests the proceeds of a reverse repurchase agreement at a rate lower than the cost of the agreement, entering into the agreement will lower the Series’ yield.

Short Sale and Short Exposure Risk—Short selling a security involves selling a borrowed security with the expectation that the value of that security will decline, so that the security may be purchased at a lower price when returning the borrowed security. A short exposure through a derivative exposes the Series to counterparty credit risk and leverage risk. The risk for loss on a short sale or other short exposure is greater than a direct investment in the security itself because the price of the borrowed security may rise, thereby increasing the price at which the security must be purchased. The risk of loss through a short sale or other short exposure may in some cases be theoretically unlimited. Government actions also may affect the Series’ ability to engage in short selling.

Risk Lose Money [Text]

rr_RiskLoseMoney

The value of an investment in the Series will fluctuate and is subject to investment risks, which means investors could lose money.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

PERFORMANCE INFORMATION

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following chart and table provide some indication of the risks of investing in the Series by showing changes in the Series’ performance from year to year and by showing how the Series’ average annual returns for one, five and ten years have compared to those of a broad measure of market performance. The information shows how the Series’ performance compares with the returns of a secondary index consisting of a Morningstar category average consistent with the Series’ investment strategy. As with all mutual funds, past performance is not necessarily an indication of how the Series will perform in the future.

The performance figures do not reflect fees and expenses associated with an investment in variable insurance products through which shares of the Series are purchased, and, if such fees and expenses were reflected, the performance figures would be lower.

Important Note: Effective January 28, 2015, significant changes to the Series’ principal investment strategies and portfolio managers were made. In connection with these changes, the Series also added a second benchmark, the Morningstar Long/Short Equity Category Average. Please note that the Series’ performance track record prior to January 28, 2015 related only to the Series’ former investments, which were materially different from those currently pursued by the Series and thus is not indicative of the Series’ future performance.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

Performance Additional Market Index [Text]

rr_PerformanceAdditionalMarketIndex

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

As with all mutual funds, past performance is not necessarily an indication of how the Series will perform in the future.

rr_AnnualReturn2005

rr_AnnualReturn2006

rr_AnnualReturn2007

rr_AnnualReturn2008

rr_AnnualReturn2009

rr_AnnualReturn2010

rr_AnnualReturn2011

rr_AnnualReturn2012

rr_AnnualReturn2013

rr_AnnualReturn2014

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock



Highest Quarter Return		Lowest Quarter Return
Q3 2010	15.79%	Q4 2008	-21.68	%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2010

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

15.79%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(21.68%)

Performance Table Heading

rr_PerformanceTableHeading

AVERAGE ANNUAL TOTAL RETURNS(For the periods ended December 31, 2014)

Label

rr_AverageAnnualReturnLabel

Series Z (Alpha Opportunity Series)

1 Year

rr_AverageAnnualReturnYear01

9.36%

5 Years

rr_AverageAnnualReturnYear05

14.27%

10 Years

rr_AverageAnnualReturnYear10

8.98%

SERIES Z (ALPHA OPPORTUNITY SERIES) | S&P 500 Index

Risk/Return:

rr_RiskReturnAbstract

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

rr_IndexNoDeductionForFeesExpensesTaxes

(reflects no deductions for fees, expenses, or taxes)

Label

rr_AverageAnnualReturnLabel

S&P 500 Index (reflects no deductions for fees, expenses, or taxes)

1 Year

rr_AverageAnnualReturnYear01

13.69%

5 Years

rr_AverageAnnualReturnYear05

15.45%

10 Years

rr_AverageAnnualReturnYear10

7.67%

SERIES Z (ALPHA OPPORTUNITY SERIES) | Morningstar Long/Short Equity Category Average

Risk/Return:

rr_RiskReturnAbstract

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

rr_IndexNoDeductionForFeesExpensesTaxes

(reflects no deductions for fees, expenses, or taxes)

Label

rr_AverageAnnualReturnLabel

Morningstar Long/Short Equity Category Average (reflects no deductions for fees, expenses or taxes)

1 Year

rr_AverageAnnualReturnYear01

2.96%

5 Years

rr_AverageAnnualReturnYear05

7.44%

10 Years

rr_AverageAnnualReturnYear10

6.06%

[1]

Total Annual Fund Operating Expenses reflect the fees and expenses of the Series as of December 31, 2014.

[2]

Security Investors, LLC, also known as Guggenheim Investments (the “Investment Manager”), has contractually agreed through May 1, 2016 to waive fees and/or reimburse expenses to the extent necessary to limit the ordinary operating expenses (exclusive of brokerage costs, dividends on securities sold short, acquired fund fees and expenses, interest, taxes, litigation, indemnification, and extraordinary expenses) (“Operating Expenses”) of the Series to an annual percentage of average daily net assets of the Series to 2.35%. The Series may have “Total Annual Fund Operating Expenses After Fee Waiver” greater than the expense cap as a result of any acquired fund fees and expenses or other expenses that are excluded from the calculation. The Investment Manager has also agreed through May 1, 2016, to waive the amount of the Series’ management fee to the extent necessary to offset the proportionate share of any management fee paid by the Series with respect to any Series investment in an underlying fund for which the Investment Manager or any of its affiliates also serves as investment manager. The Investment Manager is entitled to reimbursement by the Series of fees waived or expenses reimbursed during any of the previous 36 months beginning on the date of the expense limitation agreement provided the Operating Expenses do not exceed the then-applicable expense cap. Each agreement will expire when it reaches its termination or when the Investment Manager ceases to serve as such and it can be terminated by the Series’ Board of Trustees, with certain waived fees and reimbursed expenses subject to the recoupment rights of the Investment Manager.