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Small-Cap Index Portfolio | Small-Cap Index Portfolio  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk/Return [Heading] oef_RiskReturnHeading Small-Cap Index Portfolio
Objective [Heading] oef_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] oef_ObjectivePrimaryTextBlock
This Fund seeks investment results that correspond to the total return of an index of small-capitalization companies.
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)
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] oef_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Acquired Fund Fees and Expenses are expenses incurred indirectly by the Fund through its ownership of shares in other investment companies. As such, they are not reflected in the total annual operating expenses in the Fund’s financial statements.​
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. 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 22% 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 22.00%
Strategy [Heading] oef_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] oef_StrategyNarrativeTextBlock
Under normal circumstances, this Fund invests at least 80% of its assets in securities of companies with small market capitalizations included in the Fund’s applicable benchmark index, including instruments representative of that index (such as derivatives). The securities in the Fund’s applicable benchmark index are those companies that are included in the Russell 2000 Index, which measures the performance of the small-capitalization segment of the U.S. equity universe. The Fund principally invests in common stock. As of December 31, 2024, the market capitalization range of the Russell 2000 Index was approximately $6.1 million to $14.7 billion. As of December 31, 2024, the weighted average market capitalization of the Fund was approximately $3.6 billion.
The Fund will generally hold substantially all of the stocks in the index in approximately the same proportions as their weightings in the index. The sub-adviser will utilize a sampling approach to seek to replicate the performance of the Russell 2000 Index by investing in a portfolio of securities in the Russell 2000 Index that collectively has an investment profile similar to that of the Russell 2000 Index. The sampling approach may result in a small portion of the portfolio being invested in certain stocks in proportions that are not approximately the same as their index weightings, but which are expected to result in a portfolio that has, in the aggregate, investment characteristics (based on factors such as market capitalization and industry weightings), fundamental characteristics (such as return variability and yield) and liquidity measures similar to those of the Fund’s index. The Fund will not concentrate, except to the same approximate extent as its index may concentrate, in the securities of a particular industry or group of industries (also known as a sector).
The Fund will not deviate from the above noted strategies at any time for any reason. The Fund may become non-diversified, as defined under the Investment Company Act of 1940 (the “1940 Act”), as amended, solely as a result of a change in relative market capitalization or index weighting of one or more constituents of the index.
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 small-capitalization domestic equity market index that the Investment Adviser considers to be representative of the small-capitalization growth 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 small-capitalization domestic equity market index that the Investment Adviser considers to be representative of the small-capitalization growth 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: 31.17%; Q1 2020: (30.80%)
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 31.17%
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 (30.80%)
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)
Small-Cap Index Portfolio | Small-Cap Index 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.
Small-Cap Index Portfolio | Small-Cap Index 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.
Small-Cap Index Portfolio | Small-Cap Index 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.
Small-Cap Index Portfolio | Small-Cap Index 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.
Small-Cap Index Portfolio | Small-Cap Index Portfolio | Tracking Error Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock
Tracking Error Risk: Performance of the Fund may vary from the performance of the index for which it seeks corresponding investment results due to imperfect correlation between the Fund’s investments and that index.
Small-Cap Index Portfolio | Small-Cap Index Portfolio | Index Sampling Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock
Index Sampling Risk: Because index sampling relies on the sub-adviser to select securities that have economic characteristics similar to securities in the index for which the Fund seeks corresponding investment results as opposed to holding the constituent securities of that index in the same proportion as the index that holds them, index sampling may not result in the aggregate in investment performance matching that index or of other funds that purchased all or substantially all of the securities in the same index in approximately the same proportions as their weightings in the index.
Small-Cap Index Portfolio | Small-Cap Index Portfolio | Industry Concentration Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock
Industry Concentration Risk: Concentrating investments in a particular industry or group of industries makes the Fund more susceptible to adverse economic, business, regulatory or other developments affecting that industry or group of industries, which could negatively impact performance.
Small-Cap Index Portfolio | Small-Cap Index 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.
Small-Cap Index Portfolio | Small-Cap Index Portfolio | Risk Nondiversified Status [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock
Non-Diversification Risk: In order to track the composition of the index for which it seeks corresponding investment results, the Fund may invest a greater percentage of its assets in a single issuer or a fewer number of issuers than a fund that is classified as diversified. As a result, the Fund may become non-diversified under the 1940 Act. This increases the risk that the Fund will have greater price swings over shorter periods of time because the poor performance of a single investment or a fewer number of investments will have a greater impact on the Fund than a diversified fund with more investments.
Small-Cap Index Portfolio | Small-Cap Index Portfolio | Passive Management Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock
Passive Management Risk: Regardless of performance, a passively managed (or index) fund generally holds constituent securities of the index for which the fund seeks corresponding investment results, which could cause the index fund’s return to be lower than an actively managed fund (which generally seeks to outperform an index). An index fund will also perform poorly when such index performs poorly. In addition, an index fund has operating and other expenses while an index does not. As such, an index fund will tend to underperform the index to some degree over time even though it will attempt to track that index as closely as possible.
Small-Cap Index Portfolio | Small-Cap Index 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.
Small-Cap Index Portfolio | Small-Cap Index 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.
Small-Cap Index Portfolio | Small-Cap Index Portfolio | Class I  
Prospectus [Line Items] oef_ProspectusLineItems  
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.20%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.06%
Acquired Fund Fees and Expenses oef_AcquiredFundFeesAndExpensesOverAssets 0.02% [1]
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.58%
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 59
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 186
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 324
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 726
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 59
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 186
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 324
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 726
Small-Cap Index Portfolio | Small-Cap Index Portfolio | Class P  
Prospectus [Line Items] oef_ProspectusLineItems  
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.30%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.06%
Acquired Fund Fees and Expenses oef_AcquiredFundFeesAndExpensesOverAssets 0.02% [1]
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.38%
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 39
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 122
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 213
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 480
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 39
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 122
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 213
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 480
Small-Cap Index Portfolio | Russell 2000 Index (reflects no deductions for fees, expenses, or taxes)  
Prospectus [Line Items] oef_ProspectusLineItems  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Russell 2000 Index (reflects no deductions for fees, expenses, or taxes)
Average Annual Return, Percent oef_AvgAnnlRtrPct 11.54%
Average Annual Return, Percent oef_AvgAnnlRtrPct 7.40%
Average Annual Return, Percent oef_AvgAnnlRtrPct 7.82%
Small-Cap Index 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%
Small-Cap Index Portfolio | Class I  
Prospectus [Line Items] oef_ProspectusLineItems  
Annual Return [Percent] oef_AnnlRtrPct (4.93%)
Annual Return [Percent] oef_AnnlRtrPct 20.66%
Annual Return [Percent] oef_AnnlRtrPct 14.06%
Annual Return [Percent] oef_AnnlRtrPct (11.55%)
Annual Return [Percent] oef_AnnlRtrPct 24.80%
Annual Return [Percent] oef_AnnlRtrPct 19.16%
Annual Return [Percent] oef_AnnlRtrPct 14.24%
Annual Return [Percent] oef_AnnlRtrPct (20.86%)
Annual Return [Percent] oef_AnnlRtrPct 16.20%
Annual Return [Percent] oef_AnnlRtrPct 10.84%
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Class I (incepted January 4, 1999)
Average Annual Return, Percent oef_AvgAnnlRtrPct 10.84%
Average Annual Return, Percent oef_AvgAnnlRtrPct 6.77%
Average Annual Return, Percent oef_AvgAnnlRtrPct 7.20%
Performance Inception Date oef_PerfInceptionDate Jan. 04, 1999
Small-Cap Index Portfolio | Class P  
Prospectus [Line Items] oef_ProspectusLineItems  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Class P (incepted May 2, 2011)
Average Annual Return, Percent oef_AvgAnnlRtrPct 11.06%
Average Annual Return, Percent oef_AvgAnnlRtrPct 6.98%
Average Annual Return, Percent oef_AvgAnnlRtrPct 7.41%
Performance Inception Date oef_PerfInceptionDate May 02, 2011
[1] Acquired Fund Fees and Expenses are expenses incurred indirectly by the Fund through its ownership of shares in other investment companies. As such, they are not reflected in the total annual operating expenses in the Fund’s financial statements.