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Real Estate Securities Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading FUND SUMMARY:  REAL ESTATE SECURITIES FUND
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The investment objective of the Real Estate Securities Fund (the “Fund”) is to achieve a high total return consistent with reasonable investment risks.
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 34% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 34.00%
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
Under normal circumstances, the Fund invests at least 80%, and normally substantially all, of its net assets, plus the amount of any borrowings for investment purposes, in common stocks and other equity securities issued by real estate companies, including real estate investment trusts (“REITs”). The Fund considers companies real estate companies if such companies (i) derive at least 50% of their revenues from the ownership, construction, financing, management or sale of commercial, industrial, or residential real estate; or (ii) have at least 50% of their assets in such real estate. REITs are companies that own interests in real estate or in real estate related loans or other interests, and their revenue primarily consists of rent derived from owned, income producing real estate properties and capital gains from the sale of such properties. A REIT in the U.S. is generally not taxed on income distributed to shareholders so long as it meets certain tax related requirements, including the requirement that it distribute substantially all of its taxable income to its shareholders. REIT-like entities are organized outside of the U.S. and have operations and receive foreign tax treatment similar to that of U.S. REITs. The Fund retains the ability to invest in real estate companies of any market capitalization. The Fund may
  
invest up to 25% of its total assets in securities of foreign issuers which meet the same criteria for investment as domestic companies, or sponsored and unsponsored depositary receipts for such securities. Depositary receipts may take the form of ADRs, GDRs and EDRs. In managing the Fund’s portfolio, the Sub‑Adviser adheres to an integrated, bottom‑up, relative value investment process. 
The Fund may buy and sell portfolio securities actively. If it does, its portfolio turnover rate and transaction costs will rise, which may lower Fund performance. 
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.
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.
Real Estate Securities Risk.  The possibility that the Fund’s investments in real estate securities, including REITs, may make the Fund more susceptible to the risks associated with direct investments in real estate. These risks include, among others, declines in the value of real estate; risks related to general and local economic conditions; changes in the availability, cost and terms of mortgage funds; loss of rental income due to vacancies; obsolescence of properties; overbuilding and increased competition; increases in property taxes and operating expenses; changes in zoning laws; defaults by borrowers or tenants, particularly during an economic downturn; and changes in interest rates. Any geographic concentration of the Fund’s real estate-related investments could result in the Fund being subject to the above risks to a greater degree.
REITs Risk.  The possibility that the Fund’s investments in REITs will subject the Fund to the risks associated with the direct ownership of real estate, including fluctuations in the value of underlying properties, changes in interest rates and risks related to general or local economic conditions. REITs are dependent upon management skills and generally may not be diversified. REITs are also subject to heavy cash flow dependency, defaults by borrowers or tenants and self-liquidation.
Foreign Investment Risk.  The possibility that the Fund’s investments in foreign securities may be adversely affected by political, social, and economic conditions affecting foreign issuers or decreases in foreign currency values relative to the U.S. dollar. Investments in foreign markets may be subject to greater market volatility, decreased market liquidity, and higher transaction and custody costs. Foreign issuers also may be subject to less government and exchange regulation and there may be less reliable financial information available for such issuers and their securities.
Small- and Mid‑Cap Securities Risk.  The possibility that the Fund’s investments in small- and mid‑cap securities may be subject to greater risk and higher volatility than are customarily associated with investing in larger more established companies. Securities issued by small- and mid‑sized companies, which can include start‑up companies, tend to be more vulnerable than larger and more established companies to adverse business and economic developments. Such companies generally have narrower product lines, more limited financial resources and more limited markets for their stock as compared with larger companies. As a result, the value of such securities also may be more volatile than the securities of larger companies, and the Fund’s portfolio may experience difficulty in purchasing or selling such securities at the desired time and price or in the desired amount.
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.
  
Concentration Risk.  The possibility that, to the extent the Fund invests to a significant extent in a particular industry or group of industries within the real estate sector, the Fund may be subject to greater risks than if its investments were broadly diversified across industries and sectors. The Fund also is subject to loss due to adverse occurrences that may affect that industry or group of industries. 
Portfolio Turnover Risk.  The possibility that the Fund may frequently buy and sell portfolio securities, which may increase transaction costs to the Fund and cause the Fund’s performance to be less than you expect. 
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. 
Currency Risk.  The possibility that the value of the Fund’s assets may be affected favorably or unfavorably by currency exchange rates, currency exchange control regulations, and restrictions or prohibitions on the repatriation of foreign currencies. 
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 real estate and real estate related investing in the hope of realizing capital appreciation while diversifying their investment portfolio. 
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. 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
17.06%    -23.01%
3/31/2019    3/31/2020
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Return (for Periods Ended December 31, 2021)
Real Estate Securities Fund | Real Estate Securities Fund  
Risk/Return: rr_RiskReturnAbstract  
Investment Advisory Fees rr_ManagementFeesOverAssets 0.70%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.25%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.95%
1 Year rr_ExpenseExampleYear01 $ 97
3 Years rr_ExpenseExampleYear03 303
5 Years rr_ExpenseExampleYear05 525
10 Years rr_ExpenseExampleYear10 $ 1,166
2012 rr_AnnualReturn2012 16.00%
2013 rr_AnnualReturn2013 3.13%
2014 rr_AnnualReturn2014 30.22%
2015 rr_AnnualReturn2015 5.22%
2016 rr_AnnualReturn2016 5.49%
2017 rr_AnnualReturn2017 7.40%
2018 rr_AnnualReturn2018 (4.19%)
2019 rr_AnnualReturn2019 32.47%
2020 rr_AnnualReturn2020 (3.23%)
2021 rr_AnnualReturn2021 42.70%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.06%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (23.01%)
1 Year rr_AverageAnnualReturnYear01 42.70%
5 Years rr_AverageAnnualReturnYear05 13.49%
10 Years rr_AverageAnnualReturnYear10 12.53%
Real Estate Securities Fund | FTSE NAREIT All Equity REITs Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 41.30%
5 Years rr_AverageAnnualReturnYear05 12.46%
10 Years rr_AverageAnnualReturnYear10 12.22%