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Real Estate Portfolio | Real Estate Portfolio  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk/Return [Heading] oef_RiskReturnHeading Real Estate Portfolio
Objective [Heading] oef_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] oef_ObjectivePrimaryTextBlock
This Fund seeks current income and long-term capital appreciation.
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 44% 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 44.00%
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 operating in the real estate and related industries. The Fund invests primarily in equity securities of companies in the U.S. real estate industry, including real estate investment trusts (“REITs”) and real estate operating companies (“REOCs”). REITs and REOCs invest primarily in properties that produce income and in real estate interest or loans. The Fund focuses on REITs, as well as REOCs, that invest in a variety of property types and regions. The Fund normally will invest more than 25% of its assets in securities of companies in real estate and related industries.
The Fund may invest in small-, mid- and large-capitalization companies. The Fund may invest in a smaller number of holdings.
The sub-adviser utilizes a bottom-up investment approach for selecting investments for the Fund, using a rigorous, fundamental research analysis of individual issuers. During portfolio construction, the portfolio management team takes into consideration their general outlook on real estate markets and the impact any proposed investment would have on portfolio risk. The weights to different types of properties are primarily the result of bottom-up stock analysis but are also influenced by the team’s top-down views.
The sub-adviser may sell a holding due to a change in a company’s fundamentals, if the sub-adviser believes the security is no longer attractively valued or if the sub-adviser identifies a security that it believes offers a better investment opportunity.
The Fund is classified as non-diversified, which means it may invest in a smaller number of issuers than a diversified fund.
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 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 both to the returns of:
•
a broad-based domestic equity market index that represents the overall domestic equity market (the “Regulatory Index”) and thus may not necessarily represent the Fund’s principal investment strategies; and
​
•
a real estate sector equity market index that the Investment Adviser considers to be more representative of the real estate sector equity markets and the Fund’s principal investment strategies, and 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.
Principal Real Estate Investors LLC began managing the Fund on May 1, 2018, and some investment policies changed at that time. Another firm managed the Fund before that date.
Performance Information Illustrates Variability of Returns [Text] oef_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and Average Annual Total Returns table below 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 both to the returns of:•a broad-based domestic equity market index that represents the overall domestic equity market (the “Regulatory Index”) and thus may not necessarily represent the Fund’s principal investment strategies; and•a real estate sector equity market index that the Investment Adviser considers to be more representative of the real estate sector equity markets and the Fund’s principal investment strategies, and 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: Q1 2019: 17.60%; Q1 2020: (22.86%)
Highest Quarterly Return, Label [Optional Text] oef_HighestQuarterlyReturnLabel Best quarterly performance reflected within the bar chart:
Highest Quarterly Return, Date oef_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return oef_BarChartHighestQuarterlyReturn 17.60%
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 (22.86%)
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)
Real Estate Portfolio | Real Estate 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.
Real Estate Portfolio | Real Estate 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.
Real Estate Portfolio | Real Estate 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.
Real Estate Portfolio | Real Estate Portfolio | Real Estate Companies Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock
Real Estate Companies Risk: Companies operating in the real estate and related industries, including Real Estate Investment Trusts (“REITs”) and Real Estate Operating Companies (“REOCs”), are exposed to the risks of the real estate market and to risks associated with the ownership of real estate. These risks include fluctuations in the value of or destruction of underlying properties; tenant or borrower default; market saturation; changes in general and local economic conditions; decreases in market rates for rents; increases in vacancies; competition; property taxes; capital expenditures, or operating expenses; and other economic or political events affecting the real estate industry. Real estate companies and sectors and industries that affect the performance of real estate companies may be subject to extensive government regulation, which may change unexpectedly and frequently and significantly impact the Fund. Changing interest rates and credit quality requirements for borrowers and tenants may also affect the cash flow of REITs and REOCs and their ability to meet capital needs.
Real Estate Portfolio | Real Estate 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.
Real Estate Portfolio | Real Estate 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.
Real Estate Portfolio | Real Estate 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.
Real Estate Portfolio | Real Estate Portfolio | Risk Nondiversified Status [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock
Non-Diversification Risk: A fund that is classified as non-diversified 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. 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. Being classified as non-diversified does not prevent the Fund from being managed as though it were a diversified fund.
Real Estate Portfolio | Real Estate Portfolio | Small Number of Holdings Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock
Small Number of Holdings Risk: Because performance may be dependent on a smaller number of holdings, the Fund may be more adversely impacted by price volatility than funds with a greater number of holdings.
Real Estate Portfolio | Real Estate 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.
Real Estate Portfolio | Real Estate 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.
Real Estate Portfolio | Real Estate 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.
Real Estate Portfolio | Real Estate 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.
Real Estate Portfolio | Real Estate 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.
Real Estate Portfolio | Real Estate Portfolio | Class I  
Prospectus [Line Items] oef_ProspectusLineItems  
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.84%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.20%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.04%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 1.08%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.09%) [1]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.99%
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 101
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 335
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 587
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 1,309
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 101
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 335
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 587
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 1,309
Real Estate Portfolio | Real Estate Portfolio | Class P  
Prospectus [Line Items] oef_ProspectusLineItems  
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.84%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.04%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.88%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.09%) [1]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.79%
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 81
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 272
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 479
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 1,076
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 81
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 272
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 479
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 1,076
Real Estate Portfolio | MSCI US REITs Index (reflects no deductions for fees, expenses, or taxes)  
Prospectus [Line Items] oef_ProspectusLineItems  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel MSCI US REITs Index (reflects no deductions for fees, expenses, or taxes)
Average Annual Return, Percent oef_AvgAnnlRtrPct 7.49%
Average Annual Return, Percent oef_AvgAnnlRtrPct 3.10%
Average Annual Return, Percent oef_AvgAnnlRtrPct 4.38%
Real Estate 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%
Real Estate Portfolio | Class I  
Prospectus [Line Items] oef_ProspectusLineItems  
Annual Return [Percent] oef_AnnlRtrPct 1.52%
Annual Return [Percent] oef_AnnlRtrPct 6.59%
Annual Return [Percent] oef_AnnlRtrPct 3.24%
Annual Return [Percent] oef_AnnlRtrPct (7.45%)
Annual Return [Percent] oef_AnnlRtrPct 31.28%
Annual Return [Percent] oef_AnnlRtrPct (3.28%)
Annual Return [Percent] oef_AnnlRtrPct 40.32%
Annual Return [Percent] oef_AnnlRtrPct (25.64%)
Annual Return [Percent] oef_AnnlRtrPct 13.01%
Annual Return [Percent] oef_AnnlRtrPct 7.51%
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Class I (incepted January 4, 1999)
Average Annual Return, Percent oef_AvgAnnlRtrPct 7.51%
Average Annual Return, Percent oef_AvgAnnlRtrPct 4.16%
Average Annual Return, Percent oef_AvgAnnlRtrPct 5.23%
Performance Inception Date oef_PerfInceptionDate Jan. 04, 1999
Real Estate 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 7.73%
Average Annual Return, Percent oef_AvgAnnlRtrPct 4.37%
Average Annual Return, Percent oef_AvgAnnlRtrPct 5.44%
Performance Inception Date oef_PerfInceptionDate May 02, 2011
[1] The investment adviser has agreed to waive 0.09% 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.