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Label Element Value
Risk Return [Abstract] rr_RiskReturnAbstract  
ProspectusDate rr_ProspectusDate Feb. 01, 2012
Mid Cap Value (Prospectus Summary) | Mid Cap Value
  
Risk Return [Abstract] rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading Mid Cap Value Fund
Investment Objective, Heading rr_ObjectiveHeading Investment Objective -
investment Objective, Primary rr_ObjectivePrimaryTextBlock The Mid Cap Value Fund seeks long-term growth of capital.
Expense, Heading rr_ExpenseHeading Fees and Expenses of the Fund -
Expense, Narrative rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that
you may pay if you buy and hold shares of the Fund. You may qualify for sales
charge discounts if you and your family invest, or agree to invest in the
future, at least $100,000 in the Family of Funds, as defined on page 71 of the
Fund's prospectus. More information about these and other discounts is available
from your financial professional and in the "Buying Shares-Class A Shares"
section on page 45 of the Fund's prospectus and the "How to Purchase Shares"
section on page 36 of the Fund's statement of additional information.
Shareholder Fees, Caption rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses, Caption rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover, Heading rr_PortfolioTurnoverHeading Portfolio Turnover.
Portfolio Turnover rr_PortfolioTurnoverTextBlock The Fund pays transaction costs, such as commissions, when
it buys and sells securities (or "turns over" its portfolio). A higher portfolio
turnover rate may indicate higher transaction costs and may result in higher
taxes when Fund shares are held in a taxable account. These costs, which are not
reflected in annual fund operating expenses or in the example, affect the Fund's
performance. During the most recent fiscal year, the Fund's portfolio turnover
rate was 28 % of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 28.00%
Expense Breakpoint, Discounts rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in the Family of Funds, as defined on page 71 of the Fund's prospectus.
Expense Breakpoint, Minimum Investment Required Amount rr_ExpenseBreakpointMinimumInvestmentRequiredAmount 100,000
Expenses, Restated to Reflect Current rr_ExpensesRestatedToReflectCurrent Expense information in the table has been restated to reflect current fees.
Expense Example, Heading rr_ExpenseExampleHeading Example.
Expense Example, Narrative rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in
the Fund with the cost of investing in other mutual funds.

The Example assumes that you invest $10,000 in the Fund for the time periods
indicated and then redeem all of your shares at the end of those periods. The
Example also assumes that your investment has a 5% return each year and that the
Fund's operating expenses remain the same. Although the actual costs may be
higher or lower, based on these assumptions your cost would be:
Investment Strategy, Heading rr_StrategyHeading Principal Investment Strategies -
Investment Strategy, Narrative rr_StrategyNarrativeTextBlock The Fund pursues its objective by investing,
under normal market conditions, at least 80% of its net assets (plus borrowings
for investment purposes) in a diversified portfolio of equity securities,
which include common stocks, rights, options, warrants, convertible debt
securities, and American Depositary Receipts ("ADRs"), that, when purchased,
have market capitalizations that are usually within the range of companies
in the Russell 2500 Value Index. Although a universal definition of
mid-capitalization companies does not exist, the Fund generally defines
mid-capitalization companies as those whose market capitalization is similar to
the market capitalization of companies in the Russell 2500 Value Index, which is
an unmanaged index that measures the performance of securities of small-to-mid
cap U.S. companies with greater-than-average value orientation. As of
December 31, 2011, the index consisted of securities of companies with
capitalizations that ranged from $ 34 million to $ 7.4 billion.

Security Investors, LLC, also known as Guggenheim Investors (the "Investment
Manager"), typically chooses equity securities that appear undervalued relative
to assets, earnings, growth potential or cash flows and may invest in a limited
number of industries or industry sectors, including the technology sector. Due
to the nature of value companies, the securities included in the Fund's
portfolio typically consist of small- to medium-sized companies.

The Fund may sell a security if it is no longer considered undervalued or when
the company begins to show deteriorating fundamentals.

The Fund also may invest a portion of its assets in derivatives, including
options and futures contracts. These instruments may be used to hedge the Fund's
portfolio, to maintain exposure to the equity markets or to increase returns.

The Fund may, from time to time, invest a portion of its assets in technology
stocks.

The Fund may invest in a variety of investment vehicles, including those that
seek to track the composition and performance of a specific index, such as
exchange traded funds ("ETFs") and other mutual funds. The Fund may use these
index-based investments as a way of managing its cash position to gain exposure
to the equity markets or a particular sector of the equity market, while
maintaining liquidity. Certain investment vehicles' securities and other
securities in which the Fund may invest are restricted securities, which may be
illiquid.

Under adverse or unstable market conditions, the Fund could invest some or all
of its assets in cash, fixed-income securities, government bonds, money market
securities, or repurchase agreements. Although the Fund would do this only in
seeking to avoid losses, the Fund may be unable to pursue its investment
objective during that time, and it could reduce the benefit from any upswing in
the market.
Risk, Heading rr_RiskHeading Principal Risks -
Risk, Narrative rr_RiskNarrativeTextBlock An investment in the Fund is not a deposit of a bank and is
not insured or guaranteed by the Federal Deposit Insurance Corporation or any
other government agency. The value of an investment in the Fund will fluctuate
and is subject to investment risks, which means investors could lose money. The
principal risks of investing in the Fund are listed below.

Equity Derivatives Risk. Equity derivatives may pose risks in addition to those
associated with investing directly in securities or other investments, including
illiquidity of the equity derivative, imperfect correlations with underlying
investments or the Fund's other portfolio holdings, lack of availability and
counterparty 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 Fund
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.

Foreign Securities Risk. Foreign securities, including investments in foreign
securities through ADRs, carry additional risks when compared to U.S.
securities, including currency fluctuations, adverse political and economic
developments, unreliable or untimely information, less liquidity, limited legal
recourse and higher transactional costs.

Index Risk. Investments intended to track a benchmark index may not have
performance that corresponds with the performance of the benchmark index for any
period of time and may underperform the overall stock market.

Investment in Investment Vehicles Risk. Investing in other investment vehicles,
including ETFs and other mutual funds, subjects the Fund to those risks
affecting the investment vehicle, including the possibility that the value of
the underlying securities held by the investment vehicle could decrease.
Moreover, the Fund and its shareholders will incur its pro rata share of the
underlying vehicles' expenses.

Leverage Risk. The Fund's use of leverage through derivatives may cause the Fund
to be more volatile than if it had not been leveraged. Leverage can arise
through the use of derivatives.

Liquidity Risk. Investments are subject to liquidity risk when they are
difficult to purchase or sell. Management Risk. The Fund is actively managed.
There is no guarantee that the investment strategies will be successful.

Market Risk. The market value of the securities held by the Fund may fluctuate
resulting from factors affecting the individual company or other factors such as
changing economic, political or financial market conditions.

Overweighting Risk. Overweighting investments in certain sectors or industries
of the stock market increases the risk that the Fund will suffer a loss because
of general declines in the prices of stocks in those sectors or industries.

Restricted Securities Risk. Restricted securities generally cannot be sold to
the public and may involve a high degree of business and financial risk which
may result in substantial losses to the Fund.

Smaller Companies Risk. The securities of smaller companies are subject to
greater volatility, especially during periods of economic uncertainty. These
risks are likely to be greater for micro-cap companies.

Technology Stocks Risk. Stocks of companies involved in the technology sector
may be very volatile.

Value Stocks Risk. Value stocks are subject to the risk that the intrinsic value
of the stock may never be realized by the market or that the price goes down.
Risk, Lose Money rr_RiskLoseMoney The value of an investment in the Fund will fluctuate and is subject to investment risks, which means investors could lose money.
Risk, Not Insured Depository Institution rr_RiskNotInsuredDepositoryInstitution An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading Performance Information -
Performance, Narrative rr_PerformanceNarrativeTextBlock The following chart and table provide some indication
of the risks of investing in the Fund by showing changes in the Fund's Class A
share performance from year to year and by showing how the Fund's average annual
returns for one, five, and ten years have compared to those of a broad measure
of market performance. As with all mutual funds, past performance (before and
after taxes) is not necessarily an indication of how the Fund will perform in
the future. Updated performance information is available on the Fund's website
at www.rydex-sgi.com or by calling 1-800-820-0888.
Performance, Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns The following chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund's Class A share performance from year to year and by showing how the Fund's average annual returns for one, five, and ten years have compared to those of a broad measure of market performance.
Performance, Availability Phone Number rr_PerformanceAvailabilityPhone 1-800-820-0888
Performance, Availability Website Address rr_PerformanceAvailabilityWebSiteAddress www.rydex-sgi.com
Performance, Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture As with all mutual funds, past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart, Does Not Reflect Sales Loads rr_BarChartDoesNotReflectSalesLoads The bar chart does not reflect the impact of the sales charge applicable to Class A shares which, if reflected, would lower the returns shown.
Bar Chart, Closing rr_BarChartClosingTextBlock Highest Quarter Return
   2Q 2003    27.21%   
                       
Lowest Quarter Return
  3Q 2002     -22.48%
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes reflects no deductions for fees, expenses, or taxes
Performance Table, Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns shown in the table are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of any state or local taxes.
Performance Table, Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table, One Class of after Tax Shown rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A only. After-tax returns for Class B and C will vary.
Performance Table, Narrative rr_PerformanceTableNarrativeTextBlock After-tax returns shown in the table are calculated using the historical highest
individual federal marginal income tax rates and do not reflect the impact of
any state or local taxes. Actual after-tax returns depend on an investor's tax
situation and may differ from those shown. After-tax returns shown are not
relevant to investors who hold their Fund shares through tax-deferred
arrangements, such as 401(k) plans or individual retirement accounts. After-tax
returns are shown for Class A only. After-tax returns for Class B and C will
vary.
Average Annual Returns, Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (For the periods ended December 31, 2011)
Mid Cap Value (Prospectus Summary) | Mid Cap Value | Russell 2500 Value Index
  
Risk Return [Abstract] rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Russell 2500 Value Index (reflects no deductions for fees, expenses, or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (3.36%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (0.58%)
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.16%
Mid Cap Value (Prospectus Summary) | Mid Cap Value | A
  
Risk Return [Abstract] rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.75%
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management fees rr_ManagementFeesOverAssets 0.78% [1]
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.29%
Total annual fund operating expenses rr_ExpensesOverAssets 1.32% [2]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 603
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 873
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,164
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,990
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 603
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 873
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,164
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,990
Annual Return 2002 rr_AnnualReturn2002 (14.90%)
Annual Return 2003 rr_AnnualReturn2003 51.80%
Annual Return 2004 rr_AnnualReturn2004 26.80%
Annual Return 2005 rr_AnnualReturn2005 15.70%
Annual Return 2006 rr_AnnualReturn2006 14.90%
Annual Return 2007 rr_AnnualReturn2007 1.00%
Annual Return 2008 rr_AnnualReturn2008 (27.20%)
Annual Return 2009 rr_AnnualReturn2009 40.30%
Annual Return 2010 rr_AnnualReturn2010 16.70%
Annual Return 2011 rr_AnnualReturn2011 (7.20%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2003
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 27.21%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2002
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.48%)
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class A Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (12.53%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.03%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.67%
Mid Cap Value (Prospectus Summary) | Mid Cap Value | A | After Taxes on Distributions
  
Risk Return [Abstract] rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class A Return after taxes on distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (12.78%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (0.13%)
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.69%
Mid Cap Value (Prospectus Summary) | Mid Cap Value | A | After Taxes on Distributions and Sales
  
Risk Return [Abstract] rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class A Return after taxes on distributions and sale of fund shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (7.83%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.62%
Average Annual Returns, 10 Years, Secondary ck0000088525_AverageAnnualReturnYear10Secondary 7.44%
Mid Cap Value (Prospectus Summary) | Mid Cap Value | B
  
Risk Return [Abstract] rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice    [3]
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOfferingPrice 5.00%
Management fees rr_ManagementFeesOverAssets 0.78% [1]
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.38%
Total annual fund operating expenses rr_ExpensesOverAssets 2.16% [2]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 719
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 976
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,359
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,303
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 219
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 676
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,159
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,303
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class B Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (12.38%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.21%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.65%
Mid Cap Value (Prospectus Summary) | Mid Cap Value | C
  
Risk Return [Abstract] rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management fees rr_ManagementFeesOverAssets 0.78% [1]
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.28%
Total annual fund operating expenses rr_ExpensesOverAssets 2.06% [2]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 309
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 646
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,108
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,390
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 209
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 646
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,108
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,390
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class C Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (8.79%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.47%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.49%
[1] Mid Cap Value Fund pays an advisory fee at an annual rate of 1.00% of the average daily net assets of $200 million or less, plus 0.75% of the average daily net assets of the Fund in excess of $200 million.
[2] Expense information in the table has been restated to reflect current fees.
[3] Closed to new subscription