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Small Cap Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading FUND SUMMARY:  SMALL CAP GROWTH FUND
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The investment objective of the Small Cap Growth Fund (the “Fund”) is capital appreciation.
Expense [Heading] rr_ExpenseHeading Fund Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and Example below. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.
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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] 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 may indicate higher transaction costs. These costs, which are not reflected in the 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 19% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 19.00%
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 Fund with the cost of investing in other mutual funds. The example does not reflect expenses and charges which are, or may be, imposed under your variable contract. If the examples were to reflect the deduction of such charges, the costs shown would be greater. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold 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 your actual costs and returns might be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategy
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund seeks to achieve capital appreciation by investing, under normal circumstances, at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in equity securities of small capitalization companies with public stock market capitalizations (based upon shares available for trading on an unrestricted basis) within the range of the market capitalization of companies constituting the Russell 2000® Growth Index at the time of investment. The small capitalization companies in which the Fund invests are selected for their growth potential. The Fund’s investments in small capitalization companies may include micro-capitalization companies.
The Sub‑Adviser applies a “bottom up” approach in choosing investments. In other words, the Sub‑Adviser looks at companies one at a time to determine if a company is an attractive investment opportunity and if it is consistent with the Fund’s investment policies.
  
While the Fund’s sector and industry exposure is expected to vary over time, as of February 28, 2022, the Fund had significant exposure to the Consumer Discretionary Sector, Health Care Sector, Industrials Sector, and Information Technology Sector, as each sector is defined by the Global Industry Classification Standard. 
Risk [Heading] rr_RiskHeading Principal Risks of Investing
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with all mutual funds, an investor is subject to the risk that his or her investment could lose money. In addition to this risk, the Fund is subject to the principal risks described below.
Equity Securities Risk. In general, prices of equity securities are more volatile than those of fixed income securities. The prices of equity securities fluctuate, and sometimes widely fluctuate, in response to activities specific to the issuer of the security as well as factors unrelated to the fundamental condition of the issuer, including general market, economic and political conditions.
Market Risk. The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments.
Small‑Cap Securities Risk. The possibility that the return on the Fund’s investments in small‑cap companies may trail the return on investments in stocks of larger companies or the stock market as a whole. Stock prices of smaller companies may be based in substantial part on future expectations rather than current achievements and may move sharply, especially during market upturns and downturns. Small‑cap companies generally depend on a few key employees and have relatively limited product lines, markets or financial resources compared to larger capitalization companies. 
Sector Risk. The possibility that the Fund may invest a substantial portion of its assets within one or more economic sectors or industries, which may change from time to time. At times, the Fund may have a significant portion of its assets invested in securities of companies conducting business in a broadly related group of industries within an economic sector. Companies in the same economic sector may be similarly affected by economic or market events, making the Fund more vulnerable to unfavorable developments in that economic sector, including adverse market conditions, legislative or regulatory changes, and/or increased competition affecting that sector, than funds that invest more broadly. While the Fund’s sector and industry exposure is expected to vary over time, as of February 28, 2022, the Fund had significant exposure to the Industrials Sector, Information Technology Sector, Health Care Sector, and Consumer Discretionary Sector. In addition to these general risks, the sectors specified are also subject to the risks described below. 
Industrials Sector Risk. The Industrials Sector includes manufacturers and distributors of capital goods such as aerospace and defense, building projects, electrical equipment and machinery and companies that offer construction and engineering services. It also includes providers of commercial and professional services including printing, environmental and facilities services, office services and supplies, security and alarm services, human resource and employment services, research and consulting services. It also includes companies that provide transportation services. The prices of the securities of companies operating in the Industrials Sector may fluctuate due to the level and volatility of commodity prices, the exchange value of the dollar, import controls, worldwide competition, liability for environmental damage, depletion of resources, and mandated expenditures for safety and pollution control devices. 
Information Technology Sector Risk. The Information Technology Sector includes companies that offer software and information technology services, manufacturers and distributors of technology hardware and equipment such as communications equipment, cellular phones, computers and peripherals, electronic equipment and related instruments and semiconductors. The prices of the securities of companies operating in the Information Technology Sector are closely tied to market competition, increased sensitivity to short product cycles and aggressive pricing, and problems with bringing products to market. 
Health Care Sector Risk. The Health Care Sector includes health care providers and services, companies that manufacture and distribute health care equipment and supplies, and health care technology companies. It also includes companies involved in the research, development, production and marketing of pharmaceuticals and biotechnology products. The prices of the securities of companies operating in the Health Care Sector are closely tied to government regulation and approval of their products and services, which can have a significant effect on the price and availability of those products and services. 
Consumer Discretionary Sector Risk. The manufacturing segment of the Consumer Discretionary Sector includes automotive, household durable goods, leisure equipment, and textiles and apparel. The services segment includes restaurants, hotels, and other leisure facilities, media production and services, and consumer retailing and services. The performance of companies operating in this sector has historically been closely tied to the performance of the overall economy, and also is affected by economic growth, consumer confidence, social trends, attitudes and spending. Changes in demographics, disposable income levels, and consumer tastes also can affect the demand for, and success of, consumer products and services in the marketplace. Moreover, the Consumer Discretionary Sector encompasses those businesses that tend to be the most sensitive to economic cycles. 
“Growth” Investing Risk. The possibility that the Fund’s investments in securities of companies perceived to be “growth” companies may underperform when the Fund’s investment style shifts out of favor and may be more volatile than other securities because they are more sensitive to investor perceptions of the issuing company’s growth of earnings potential. Also, because growth companies usually invest a high portion of earnings in their businesses, growth stocks may lack the dividends of some value stocks that can cushion stock prices in a falling market. 
Management Risk. The possibility that the investment decisions, techniques, analyses or models implemented by the Fund’s Sub‑Adviser in seeking to achieve the Fund’s investment objective may not produce the returns expected, may cause the Fund’s shares to lose value or may cause the Fund to underperform relevant benchmarks or other funds with similar investment objectives. 
IPOs Risk. The possibility that the Fund’s performance may be affected by the purchase of securities issued in initial public offerings (IPOs) that have little to no trading history, limited issuer information, increased volatility and may not be available to the extent desired. The prices of securities bought in IPOs may rise and fall rapidly, often because of investor perceptions rather than economic reasons. 
Liquidity Risk. The possibility that the market for certain of the Fund’s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price, particularly in times of market turmoil. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. Illiquid securities may also be more difficult to value. If the Fund is forced to sell an illiquid security to fund redemptions or for other cash needs, it may be forced to sell the security at a loss. 
An investment in the Fund may be appropriate for investors who are willing to accept the risks and uncertainties of investing in small cap growth companies in the hope of earning capital appreciation. 
Risk Lose Money [Text] rr_RiskLoseMoney As with all mutual funds, an investor is subject to the risk that his or her investment could lose money.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table below show the performance of the Fund both year‑by‑year and as an average over different periods of time. Performance prior to May 1, 2013 reflects the Fund’s investment performance when managed by a previous sub‑adviser pursuant to a substantially similar principal investment strategy. Since May 1, 2013, Janus Henderson Investors US LLC has been responsible for the Fund’s day‑to‑day portfolio management. Therefore, the performance and average annual total returns shown for periods prior to May 1, 2013 may have differed had Janus Henderson Investors US LLC been responsible for the day‑to‑day portfolio management during those periods. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund’s average annual total returns for various periods compare with those of a broad-based securities market index. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower. 
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund’s average annual total returns for various periods compare with those of a broad-based securities market index.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance does not necessarily indicate how the Fund will perform in the future.
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower. 
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter    Worst Quarter
30.20%    -26.79%
6/30/2020    3/31/2020
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Return (for Periods Ended December 31, 2021)
Small Cap Growth Fund | Small Cap Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Investment Advisory Fees rr_ManagementFeesOverAssets 0.73%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.26%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.99%
1 Year rr_ExpenseExampleYear01 $ 101
3 Years rr_ExpenseExampleYear03 315
5 Years rr_ExpenseExampleYear05 547
10 Years rr_ExpenseExampleYear10 $ 1,213
2012 rr_AnnualReturn2012 5.73%
2013 rr_AnnualReturn2013 37.60%
2014 rr_AnnualReturn2014 7.76%
2015 rr_AnnualReturn2015 0.42%
2016 rr_AnnualReturn2016 8.71%
2017 rr_AnnualReturn2017 24.84%
2018 rr_AnnualReturn2018 (4.64%)
2019 rr_AnnualReturn2019 28.24%
2020 rr_AnnualReturn2020 32.06%
2021 rr_AnnualReturn2021 8.70%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 30.20%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (26.79%)
1 Year rr_AverageAnnualReturnYear01 8.70%
5 Years rr_AverageAnnualReturnYear05 16.99%
10 Years rr_AverageAnnualReturnYear10 14.13%
Small Cap Growth Fund | Russell 2000® Growth Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.83%
5 Years rr_AverageAnnualReturnYear05 14.53%
10 Years rr_AverageAnnualReturnYear10 14.14%