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Label Element Value
Value Advantage Portfolio | Value Advantage Portfolio  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk/Return [Heading] oef_RiskReturnHeading Value Advantage Portfolio
Objective [Heading] oef_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] oef_ObjectivePrimaryTextBlock
This Fund seeks to provide long-term total return from a combination of income and capital gains.
Expense Heading [Optional Text] oef_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] oef_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 Examples below. The table and Examples below also do not reflect expenses and charges that are imposed under your variable annuity contract or variable life insurance policy. For information on these expenses and charges, please refer to the applicable contract or policy prospectus. If these fees and expenses were included, the fees and expenses shown would be higher.
Operating Expenses Caption [Optional Text] oef_OperatingExpensesCaption 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 oef_FeeWaiverOrReimbursementOverAssetsDateOfTermination Apr. 30, 2026
Expense Example [Heading] oef_ExpenseExampleHeading Examples
Expense Example Narrative [Text Block] oef_ExpenseExampleNarrativeTextBlock
The Examples are intended to help you compare the cost of investing in the Fund with the cost of investing in other Funds of the Trust or other mutual funds. The Examples assume that you invest $10,000 for the time periods indicated, that your investment has a 5% return each year and that the Fund’s annual operating expenses remain as stated in the previous table for the time periods shown except for the fee waiver, which is only reflected for the contractual period. Although your actual costs may be higher or lower, the Examples show what your costs would be based on these assumptions.
These Examples do not reflect fees and expenses of any variable annuity contract or variable life insurance policy. If these were included, the expenses (in dollars) shown would be higher. Keep in mind that this is only an estimate; actual expenses and performance may vary.
Expense Example by, Year, Caption [Text] oef_ExpenseExampleByYearCaption Your expenses (in dollars) if you buy, sell/redeem or hold all of your shares at the end of each period
Expense Example, No Redemption, By Year, Caption [Text] oef_ExpenseExampleNoRedemptionByYearCaption Your expenses (in dollars) if you buy, sell/redeem or hold all of your shares at the end of each period
Portfolio Turnover [Heading] oef_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] oef_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its holdings). During the
fiscal year ended December 31, 2024, the portfolio turnover rate was 55% of the average value of the Fund. A higher portfolio turnover rate reflects a greater number of securities being bought or sold, which may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Examples, affect the Fund’s performance.
Portfolio Turnover, Rate oef_PortfolioTurnoverRate 55.00%
Strategy [Heading] oef_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] oef_StrategyNarrativeTextBlock
This Fund invests primarily in equity securities across all market capitalizations. The Fund may at any given time invest a significant portion of its assets in companies of one particular market capitalization category, such as large-capitalization companies. Equity securities in which the Fund primarily invests include common stocks.
The sub-adviser normally invests the Fund’s assets across different groups of industries/sectors, but may invest a significant percentage of the Fund’s assets in issuers in a single sector at its investment discretion in seeking the investment goal of the Fund. As of December 31, 2024, a significant portion of the Fund is represented by securities of companies in the Financial sector.
In managing the Fund, the sub-adviser employs a bottom-up approach to its selection of securities to identify undervalued companies that have the potential to grow their intrinsic values per share, and to purchase these companies at a discount.
The sub-adviser may sell a security for several reasons. A security may be sold due to a change in the company’s fundamentals or if the sub-adviser believes the security is no longer attractively valued. Investments may also be sold if the sub-adviser identifies a security that it believes offers a better investment opportunity.
The Fund may lend its portfolio holdings to certain financial institutions.
Bar Chart and Performance Table [Heading] oef_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] oef_PerformanceNarrativeTextBlock
The bar chart and Average Annual Total Returns table below show performance information for the Fund and provide some indication of the risk of investing in the Fund by showing changes in the performance of the Fund from year to year and showing how the Fund’s average annual total returns compare to the returns of:
•
a broad-based domestic equity market index that represents the overall domestic equity market (the “Regulatory Index”) which the Fund has included to comply with regulatory requirements and thus may not necessarily represent the Fund’s principal investment strategies; and
​
•
a value domestic equity market index that the Investment Adviser considers to be representative of the value domestic equity markets and the Fund’s principal investment strategies. The Investment Adviser considers this index to be the appropriate benchmark index for the Fund for performance comparison.
​
The bar chart shows the performance of the Fund’s Class I shares. Returns do not reflect fees and expenses of any variable annuity contract or variable life insurance policy; if these fees and expenses were included, the returns shown would be lower. Past performance is not necessarily an indication of how the Fund will perform in the future. Performance reflects fee waivers or expense limitations, if any, that were in effect during the periods presented.
Performance Information Illustrates Variability of Returns [Text] oef_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and Average Annual Total Returns table below show performance information for the Fund and provide some indication of the risk of investing in the Fund by showing changes in the performance of the Fund from year to year and showing how the Fund’s average annual total returns compare to the returns of:•a broad-based domestic equity market index that represents the overall domestic equity market (the “Regulatory Index”) which the Fund has included to comply with regulatory requirements and thus may not necessarily represent the Fund’s principal investment strategies; and•a value domestic equity market index that the Investment Adviser considers to be representative of the value domestic equity markets and the Fund’s principal investment strategies. The Investment Adviser considers this index to be the appropriate benchmark index for the Fund for performance comparison.
Performance Past Does Not Indicate Future [Text] oef_PerformancePastDoesNotIndicateFuture Past performance is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] oef_BarChartHeading Calendar Year Total Returns (%)
Bar Chart Does Not Reflect Sales Loads [Text] oef_BarChartDoesNotReflectSalesLoads Returns do not reflect fees and expenses of any variable annuity contract or variable life insurance policy; if these fees and expenses were included, the returns shown would be lower.
Bar Chart Closing [Text Block] oef_BarChartClosingTextBlock
Best and worst quarterly performance reflected within the bar chart: Q4 2020: 19.61%; Q1 2020: (31.13%)
Highest Quarterly Return, Label [Optional Text] oef_HighestQuarterlyReturnLabel Best quarterly performance reflected within the bar chart:
Highest Quarterly Return, Date oef_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return oef_BarChartHighestQuarterlyReturn 19.61%
Lowest Quarterly Return, Label [Optional Text] oef_LowestQuarterlyReturnLabel worst quarterly performance reflected within the bar chart:
Lowest Quarterly Return, Date oef_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return oef_BarChartLowestQuarterlyReturn (31.13%)
Index No Deduction for Fees, Expenses, or Taxes [Text] oef_IndexNoDeductionForFeesExpensesTaxes (reflects no deductions for fees, expenses, or taxes)
Average Annual Return, Caption [Optional Text] oef_AverageAnnualReturnCaption Average Annual Total Returns ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (For the periods ended December 31, 2024)
Value Advantage Portfolio | Value Advantage Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock As with any mutual fund, the value of the Fund’s investments, and therefore the value of your shares, may go up or down and you could lose money.
Value Advantage Portfolio | Value Advantage Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock 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.
Value Advantage Portfolio | Value Advantage Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably. Income from equity securities may be reduced by changes in the dividend policies of issuers and there is no guarantee that issuers will distribute dividends in the future or that dividends will remain at current levels or increase over time.
Value Advantage Portfolio | Value Advantage Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock
Value Companies Risk: Value companies are those that a portfolio manager believes are undervalued and trading for less than their intrinsic values. There is a risk that the determination that a stock is undervalued is not correct or is not recognized in the market.
Value Advantage Portfolio | Value Advantage Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock
Large-Capitalization Companies Risk: Although large-capitalization companies tend to have more stable prices than smaller, less established companies, they are still subject to equity securities risk. In addition, large-capitalization equity security prices may not rise as much as prices of equity securities of small-capitalization companies.
Value Advantage Portfolio | Value Advantage Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock
Mid-Capitalization Companies Risk: Mid-capitalization companies may be subject to greater price volatility and may be more vulnerable to economic, market and industry changes than larger, more established companies.
Value Advantage Portfolio | Value Advantage Portfolio | Active Management Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock
Active Management Risk: A portfolio manager’s judgments about the potential value or price appreciation of an investment may prove to be incorrect or fail to have the intended results, which could negatively impact the Fund’s performance.
Value Advantage Portfolio | Value Advantage Portfolio | Financial Sector Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock
Financial Sector Risk: The operations and businesses of Financial services companies are subject to extensive governmental regulation, the availability and cost of capital funds, and interest rate changes. General market downturns may affect financial services companies adversely.
Value Advantage Portfolio | Value Advantage Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock
Liquidity Risk: Certain holdings may be difficult to purchase, sell and value, particularly during adverse market conditions, because there is a limited market for the investment or there are restrictions on resale. The Fund may not be able to sell a holding quickly at the price it has valued the holding, may be unable to take advantage of market opportunities or may be forced to sell other more desirable, more liquid securities or sell less liquid or illiquid securities at a loss if needed to raise cash to conduct operations, including to meet redemption requests.
Value Advantage Portfolio | Value Advantage Portfolio | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock
Small-Capitalization Companies Risk: Small-capitalization companies may be more susceptible to liquidity risk and price volatility and be more vulnerable to economic, market and industry changes than larger, more established companies.
Value Advantage Portfolio | Value Advantage Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock
Underlying Fund Risk: Because the Fund is available for investment by one or more “fund of funds” of the Trust and thus may have a significant percentage of its outstanding shares held by such fund of funds, a change in asset allocation by the fund of funds could result in large redemptions out of the Fund, causing the sale of securities in a short timeframe and potential increases in expenses to the Fund and its remaining shareholders, both of which could negatively impact performance.
Value Advantage Portfolio | Value Advantage Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock
Securities Lending Risk: The Fund may engage in securities lending, which involves the risk that the Fund may suffer a loss if the borrower fails to return the loaned securities in a timely manner or at all. The Fund could also lose money due to the decline in the value of the collateral provided or a decline in the value of any investments made with cash collateral.
Value Advantage Portfolio | Value Advantage Portfolio | Class I  
Prospectus [Line Items] oef_ProspectusLineItems  
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.66%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.20%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.03%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.89%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.02%) [1]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.87%
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 89
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 282
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 491
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 1,094
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 89
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 282
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 491
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 1,094
Value Advantage Portfolio | Value Advantage Portfolio | Class P  
Prospectus [Line Items] oef_ProspectusLineItems  
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.66%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.03%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.69%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.02%) [1]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.67%
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 68
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 219
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 382
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 857
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 68
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 219
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 382
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 857
Value Advantage Portfolio | Russell 3000 Value Index (reflects no deductions for fees, expenses, or taxes)  
Prospectus [Line Items] oef_ProspectusLineItems  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Russell 3000 Value Index (reflects no deductions for fees, expenses, or taxes)
Average Annual Return, Percent oef_AvgAnnlRtrPct 13.98%
Average Annual Return, Percent oef_AvgAnnlRtrPct 8.60%
Average Annual Return, Percent oef_AvgAnnlRtrPct 8.40%
Value Advantage Portfolio | S&P 500 Index (reflects no deductions for fees, expenses, or taxes) (Regulatory Index)  
Prospectus [Line Items] oef_ProspectusLineItems  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel S&P 500 Index (reflects no deductions for fees, expenses, or taxes) (Regulatory Index)
Average Annual Return, Percent oef_AvgAnnlRtrPct 25.02%
Average Annual Return, Percent oef_AvgAnnlRtrPct 14.53%
Average Annual Return, Percent oef_AvgAnnlRtrPct 13.10%
Value Advantage Portfolio | Class I  
Prospectus [Line Items] oef_ProspectusLineItems  
Annual Return [Percent] oef_AnnlRtrPct (4.69%)
Annual Return [Percent] oef_AnnlRtrPct 16.49%
Annual Return [Percent] oef_AnnlRtrPct 14.32%
Annual Return [Percent] oef_AnnlRtrPct (9.06%)
Annual Return [Percent] oef_AnnlRtrPct 26.96%
Annual Return [Percent] oef_AnnlRtrPct (2.78%)
Annual Return [Percent] oef_AnnlRtrPct 28.52%
Annual Return [Percent] oef_AnnlRtrPct (4.07%)
Annual Return [Percent] oef_AnnlRtrPct 9.60%
Annual Return [Percent] oef_AnnlRtrPct 16.50%
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Class I (incepted April 30, 2013)
Average Annual Return, Percent oef_AvgAnnlRtrPct 16.50%
Average Annual Return, Percent oef_AvgAnnlRtrPct 8.89%
Average Annual Return, Percent oef_AvgAnnlRtrPct 8.41%
Performance Inception Date oef_PerfInceptionDate Apr. 30, 2013
Value Advantage Portfolio | Class P  
Prospectus [Line Items] oef_ProspectusLineItems  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Class P (incepted April 30, 2013)
Average Annual Return, Percent oef_AvgAnnlRtrPct 16.74%
Average Annual Return, Percent oef_AvgAnnlRtrPct 9.11%
Average Annual Return, Percent oef_AvgAnnlRtrPct 8.63%
Performance Inception Date oef_PerfInceptionDate Apr. 30, 2013
[1]
The investment adviser has agreed to waive 0.02% of its management fee through April 30, 2026. Thereafter, the fee waiver agreement renews annually unless terminated by the investment adviser upon at least 30 days written notice prior to the end of the contract term or upon termination of the investment advisory agreement or by the Trust upon 90 days’ written notice to the investment adviser.