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Investment Risks
Apr. 29, 2025
Bond Plus Portfolio | Bond Plus Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Bond Plus Portfolio | Bond Plus Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Bond Plus Portfolio | Bond Plus Portfolio | ETF Market Trading Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
ETF Market Trading Risk: An ETF faces numerous market trading risks, including the potential lack of an active market for ETF shares, losses from trading in secondary markets, periods of high volatility and disruption in the creation and/or redemption process of the ETF. Any of these factors, among others, may lead to the ETF’s shares trading above NAV (at a premium) or below NAV (at a discount). Thus, an investor may pay more (or less) than NAV when buying shares of the ETF in the secondary market, and may receive less (or more) than NAV when selling those shares in the secondary market. The portfolio managers cannot predict whether shares will trade at a premium or discount or at NAV. The Bond Plus Portfolio has indirect exposure to ETF Market Trading Risk through its investments in total return swap agreements on an ETF.
Bond Plus Portfolio | Bond Plus Portfolio | Restricted Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Restricted Securities Risk: Unless registered for sale to the public under applicable federal securities law, restricted securities such as those issued pursuant to Rule 144A can be sold only in private transactions to qualified purchasers pursuant to an exemption from registration. The sale price realized from a private transaction could be less than the Fund’s purchase price for the restricted security. It may be difficult to identify a qualified purchaser for a restricted security held by the Fund and such security could be deemed illiquid. It may also be more difficult to value such securities.
Bond Plus Portfolio | Bond Plus Portfolio | Mortgage-Related and Other Asset-Backed Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related and other asset-backed securities are subject to certain risks affecting the housing market or the market for the assets underlying such securities. These securities are also subject to extension risk (the risk that rising interest rates extend the duration of fixed mortgage-related and other asset-backed securities, making them more sensitive to changes in interest rates), interest rate risk (the risk that rising interest rates will cause a decline in the value of a fixed income security), subprime risk (the risk that these securities have exposure to borrowers with lower credit risk, increasing potential default), prepayment risk (when interest rates decline, borrowers may pay off their mortgages sooner than expected which can reduce the Fund’s returns because the Fund may have to reinvest its assets at lower interest rates), call risk (similar to prepayment risk, an issuer may pay its obligations under
a security sooner than expected), U.S. government securities risk (securities backed by different U.S. government agencies are subject to varying levels of credit rating risk), issuer risk (the risk that a private issuer cannot meet its obligations) and stripped mortgage-related securities risk (these securities are particularly sensitive to changes in interest rates).
Bond Plus Portfolio | Bond Plus Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Bond Plus Portfolio | Bond Plus Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Bond Plus Portfolio | Bond Plus Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
Bond Plus Portfolio | Bond Plus Portfolio | Swap Agreements Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Swap Agreements Risk: Swap agreements are derivative contracts where the parties agree to exchange the returns earned on specific assets, such as the return on, or increase in value of, an amount invested in a particular “basket” of securities representing a certain index. As a derivative, it is subject to derivatives risk, including counterparty risk. Although certain standard swap agreements are centrally cleared through an exchange, which is expected to decrease counterparty risk and increase liquidity compared to swaps that are privately negotiated, central clearing does not eliminate these risks. In addition, the Fund’s use of total return swap agreements is subject to market risks based upon changes in the value of the underlying index or reference instrument.
Bond Plus Portfolio | Bond Plus Portfolio | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Derivatives Risk: The use of futures contracts, options (FDS managed portion only) or swap agreements (each a type of derivative instrument) as a principal investment strategy subjects the Fund to a number of risks, including: counterparty risk, leverage risk, market risk, regulatory risk, liquidity and valuation risk, operational risk, correlation risk, legal risk and premium risk. Derivatives may be riskier than other types of investments and may increase the Fund’s volatility and risk of loss.
Bond Plus Portfolio | Bond Plus Portfolio | Leverage Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Leverage Risk: The Fund may invest in futures contracts, options (FDS managed portion only) or swap agreements as a principal investment strategy. These derivative investments give rise to a form of leverage. Leverage is investment exposure that exceeds the initial amount invested. The loss on a leveraged investment may far exceed the Fund’s principal amount invested. Leverage can magnify the Fund’s gains and losses and therefore increase its volatility.
Bond Plus Portfolio | Bond Plus Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce the Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
Bond Plus Portfolio | Bond Plus Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, the Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, the Fund’s yield (and total return) also may be low and the Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
Bond Plus Portfolio | Bond Plus Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
Bond Plus Portfolio | Bond Plus Portfolio | Financial Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Bond Plus Portfolio | Bond Plus Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Bond Plus Portfolio | Bond Plus Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Core Income Portfolio | Core Income Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Core Income Portfolio | Core Income Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Core Income Portfolio | Core Income Portfolio | Mortgage-Related and Other Asset-Backed Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related and other asset-backed securities are subject to certain risks affecting the housing market or the market for the assets underlying such securities. These securities are also subject to extension risk (the risk that rising interest rates extend the duration of fixed mortgage-related and other asset-backed securities, making them more sensitive to changes in interest rates), interest rate risk (the risk that rising interest rates will cause a decline in the value of a fixed income security), subprime risk (the risk that these securities have exposure to borrowers with lower credit risk, increasing potential default), prepayment risk (when interest rates decline, borrowers may pay off their mortgages sooner than expected which can reduce the Fund’s returns because the Fund may have to reinvest its assets at lower interest rates), call risk (similar to prepayment risk, an issuer may pay its obligations under a security sooner than expected), U.S. government securities risk (securities backed by different U.S. government agencies are subject to varying levels of credit rating risk), issuer risk (the risk that a private issuer cannot meet its obligations) and stripped mortgage-related securities risk (these securities are particularly sensitive to changes in interest rates).
Core Income Portfolio | Core Income Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Core Income Portfolio | Core Income Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Core Income Portfolio | Core Income Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
Core Income Portfolio | Core Income Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce the Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
Core Income Portfolio | Core Income Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, the Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, the Fund’s yield (and total return) also may be low and the Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
Core Income Portfolio | Core Income Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying
degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
Core Income Portfolio | Core Income Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Core Income Portfolio | Core Income Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Core Income Portfolio | Core Income Portfolio | High Yield/High Risk or “Junk” Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
High Yield/High Risk or “Junk” Securities Risk: High yield/​high risk securities are typically issued by companies that are highly leveraged, less creditworthy or financially distressed and are considered to be mostly speculative in nature (high risk), subject to greater liquidity risk, and subject to a greater risk of default than higher rated securities. High yield/high risk securities (including loans) may be more volatile than investment grade securities.
Core Income Portfolio | Core Income Portfolio | Floating Rate Loan Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Floating Rate Loan Risk: Floating rate loans (or bank loans) are usually rated below investment grade and thus are subject to high yield/high risk or “junk” securities risk. The market for floating rate loans is a private interbank resale market and thus may be subject to irregular trading activity, wide bid/ask spreads and delayed settlement periods. Purchases and sales of loans are generally subject to contractual restrictions that must be fulfilled before a loan can be bought or sold. These restrictions may hamper the Fund’s ability to buy or sell loans and negatively affect the transaction price. A significant portion of the floating rate loans held by the Fund may be “covenant lite” loans that contain fewer or less restrictive constraints on the borrower or other borrower-friendly characteristics and offer less protections for investors than covenant loans. It may take longer than seven days for transactions in loans to settle. This may result in cash proceeds not being immediately available to the Fund, requiring the Fund to borrow cash which would increase the Fund’s expenses. The Fund is also subject to credit risk with respect to the issuer of the loan. Investments in junior loans involve a higher degree of overall risk.
U.S. federal securities laws afford certain protections against fraud and misrepresentation in connection with the offering or sale of a security, as well as against manipulation of trading markets for securities. However, it is unclear whether these protections are available to an investment in a loan.
Core Income Portfolio | Core Income Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Diversified Bond Portfolio | Diversified Bond Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Diversified Bond Portfolio | Diversified Bond Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Diversified Bond Portfolio | Diversified Bond Portfolio | Restricted Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Restricted Securities Risk: Unless registered for sale to the public under applicable federal securities law, restricted securities such as those issued pursuant to Rule 144A can be sold only in private transactions to qualified purchasers pursuant to an exemption from registration. The sale price realized from a private transaction could be less than the Fund’s purchase price for the restricted security. It may be difficult to identify a qualified purchaser for a restricted security held by the Fund and such security could be deemed illiquid. It may also be more difficult to value such securities.
Diversified Bond Portfolio | Diversified Bond Portfolio | Mortgage-Related and Other Asset-Backed Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related and other asset-backed securities are subject to certain risks affecting the housing market or the market for the assets underlying such securities. These securities are also subject to extension risk (the risk that rising interest rates extend the duration of fixed mortgage-related and other asset-backed securities, making them more sensitive to changes in interest rates), interest rate risk (the risk that rising interest rates will cause a decline in the value of a fixed income security), subprime risk (the risk that these securities have exposure to borrowers with lower credit risk, increasing potential default), prepayment risk (when interest rates decline, borrowers may pay off their mortgages sooner than expected which can reduce the Fund’s returns because the Fund may have to reinvest its assets at lower interest rates), call risk (similar to prepayment risk, an issuer may pay its obligations under a security sooner than expected), U.S. government securities risk (securities backed by different U.S. government agencies are subject to varying levels of credit rating risk), issuer risk (the risk that a private issuer cannot meet its obligations) and stripped mortgage-related securities risk (these securities are particularly sensitive to changes in interest rates).
Diversified Bond Portfolio | Diversified Bond Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Diversified Bond Portfolio | Diversified Bond Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Diversified Bond Portfolio | Diversified Bond Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
Diversified Bond Portfolio | Diversified Bond Portfolio | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Derivatives Risk: The use of forward commitments, futures contracts, options or swap agreements (each a type of derivative instrument) as a principal investment strategy subjects the Fund to a number of risks, including: counterparty risk, leverage risk, market risk, regulatory risk, liquidity and valuation risk, operational risk, correlation risk, legal risk and premium risk. Derivatives may be riskier than other types of investments and may increase the Fund’s volatility and risk of loss.
Diversified Bond Portfolio | Diversified Bond Portfolio | Leverage Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Leverage Risk: The Fund may invest in forward commitments, futures contracts, options or swap agreements as a principal investment strategy. These derivative investments give rise to a form of leverage. Leverage is investment exposure that exceeds the initial amount invested. The loss on a leveraged investment may far exceed the Fund’s principal amount invested. Leverage can magnify the Fund’s gains and losses and therefore increase its volatility.
Diversified Bond Portfolio | Diversified Bond Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are
of higher quality. Defaults may potentially reduce the Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
Diversified Bond Portfolio | Diversified Bond Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, the Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, the Fund’s yield (and total return) also may be low and the Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
Diversified Bond Portfolio | Diversified Bond Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
Diversified Bond Portfolio | Diversified Bond Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Diversified Bond Portfolio | Diversified Bond Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Diversified Bond Portfolio | Diversified Bond Portfolio | High Yield/High Risk or “Junk” Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
High Yield/High Risk or “Junk” Securities Risk: High yield/​high risk securities are typically issued by companies that are highly leveraged, less creditworthy or financially distressed and are considered to be mostly speculative in nature (high risk), subject to greater liquidity risk, and subject to a greater risk of default than higher rated securities. High yield/high risk securities (including loans) may be more volatile than investment grade securities.
Diversified Bond Portfolio | Diversified Bond Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Diversified Bond Portfolio | Diversified Bond Portfolio | Emerging Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Emerging Markets Risk: Investments in or exposure to investments in emerging market countries may be riskier than investments in or exposure to investments in U.S. and other developed markets for many reasons, including smaller market capitalizations, greater price volatility, less liquidity, lower credit quality, a higher degree of political and economic instability, the impact of economic sanctions, less governmental regulation and supervision of the financial industry and markets, and less stringent financial reporting and accounting standards and controls.
Diversified Bond Portfolio | Diversified Bond Portfolio | Inflation-Indexed Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Inflation-Indexed Debt Securities Risk: The principal values of inflation-indexed debt securities tend to increase when inflation rises and decrease when inflation falls.
Diversified Bond Portfolio | Diversified Bond Portfolio | Convertible Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Convertible Securities Risk: Convertible securities are generally subject to the risks of stocks when the underlying stock price is high relative to the conversion price (because the conversion feature is more valuable) and to the risks of debt securities when the underlying stock price is low relative to the conversion price (because the conversion feature is less valuable). Convertible securities are also generally subject to credit risk, as they tend to be of lower credit quality, and interest rate risk, though they generally are not as sensitive to interest rate changes as conventional debt securities. A convertible security’s value also tends to increase and decrease with the underlying stock and typically has less potential for gain or loss than the underlying stock.
Diversified Bond Portfolio | Diversified Bond Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of the Fund’s investments denominated in or with exposure to that foreign currency.
Diversified Bond Portfolio | Diversified Bond Portfolio | Conflicts of Interest Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Conflicts of Interest Risk: PLFA is subject to competing interests that have the potential to influence its investment decisions for the Fund with regard to the allocation of Fund assets among the two strategies. For example, the use of one strategy of the Fund that provides greater profitability to PLFA than the other may create an incentive for PLFA to use that strategy. PLFA seeks to identify and address any potential conflicts in a manner that is fair to the Fund and its shareholders. PLFA has adopted a policy under which investment decisions for the Fund must be made in the best interests of the Fund and its shareholders.
Floating Rate Income Portfolio | Floating Rate Income Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Floating Rate Income Portfolio | Floating Rate Income Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Floating Rate Income Portfolio | Floating Rate Income Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Floating Rate Income Portfolio | Floating Rate Income Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Floating Rate Income Portfolio | Floating Rate Income Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
Floating Rate Income Portfolio | Floating Rate Income Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk
of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce the Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
Floating Rate Income Portfolio | Floating Rate Income Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, the Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, the Fund’s yield (and total return) also may be low and the Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
Floating Rate Income Portfolio | Floating Rate Income Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Floating Rate Income Portfolio | Floating Rate Income Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Floating Rate Income Portfolio | Floating Rate Income Portfolio | High Yield/High Risk or “Junk” Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
High Yield/High Risk or “Junk” Securities Risk: High yield/​high risk securities are typically issued by companies that are highly leveraged, less creditworthy or financially distressed and are considered to be mostly speculative in nature (high risk), subject to greater liquidity risk, and subject to a greater risk of default than higher rated securities. High yield/high risk securities (including loans) may be more volatile than investment grade securities.
Floating Rate Income Portfolio | Floating Rate Income Portfolio | Floating Rate Loan Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Floating Rate Loan Risk: Floating rate loans (or bank loans) are usually rated below investment grade and thus are subject to high yield/high risk or “junk” securities risk. The market for floating rate loans is a private interbank resale market and thus may be subject to irregular trading activity, wide bid/ask spreads and delayed settlement periods. Purchases and sales of loans are generally subject to contractual restrictions that must be fulfilled before a loan can be bought or sold. These restrictions may hamper the Fund’s ability to buy or sell loans and negatively affect the transaction price. A significant portion of the floating rate loans held by the Fund may be “covenant lite” loans that contain fewer or less restrictive constraints on the borrower or other borrower-friendly characteristics and offer less protections for investors than covenant loans. It may take longer than seven days for transactions in loans to settle. This may result in cash proceeds not being immediately available to the Fund, requiring the Fund to borrow cash which would increase the Fund’s expenses. The Fund is also subject to credit risk with respect to the issuer of the loan. Investments in junior loans involve a higher degree of overall risk.
​
U.S. federal securities laws afford certain protections against fraud and misrepresentation in connection with the offering or sale of a security, as well as against manipulation of trading markets for securities. However, it is unclear whether these protections are available to an investment in a loan.
Floating Rate Income Portfolio | Floating Rate Income Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Floating Rate Income Portfolio | Floating Rate Income Portfolio | Industrial Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Industrial Sector Risk: Industrial companies are affected by supply and demand both for their specific product or service and for industrial sector products in general. Government regulation, world events, exchange rates and economic conditions will likewise affect the performance of these companies. For example, aerospace and defense companies can be significantly affected by government spending policies because they rely significantly on government demand for their products and services. Transportation securities, another component of the industrial sector, are cyclical and have occasional sharp price movements which may result from changes in the economy, fuel prices, labor agreements and insurance costs.
High Yield Bond Portfolio | High Yield Bond Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
High Yield Bond Portfolio | High Yield Bond Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
High Yield Bond Portfolio | High Yield Bond Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
High Yield Bond Portfolio | High Yield Bond Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
High Yield Bond Portfolio | High Yield Bond Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
High Yield Bond Portfolio | High Yield Bond Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk
of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce the Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
High Yield Bond Portfolio | High Yield Bond Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, the Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, the Fund’s yield (and total return) also may be low and the Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
High Yield Bond Portfolio | High Yield Bond Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
High Yield Bond Portfolio | High Yield Bond Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
High Yield Bond Portfolio | High Yield Bond Portfolio | High Yield/High Risk or “Junk” Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
High Yield/High Risk or “Junk” Securities Risk: High yield/​high risk securities are typically issued by companies that are highly leveraged, less creditworthy or financially distressed and are considered to be mostly speculative in nature (high risk), subject to greater liquidity risk, and subject to a greater risk of default than higher rated securities. High yield/high risk securities may be more volatile than investment grade securities.
High Yield Bond Portfolio | High Yield Bond Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Inflation Managed Portfolio | Inflation Managed Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Inflation Managed Portfolio | Inflation Managed Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Inflation Managed Portfolio | Inflation Managed Portfolio | Mortgage-Related and Other Asset-Backed Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related and other asset-backed securities are subject to certain risks affecting the housing market or the market for the assets underlying such securities. These securities are also subject to extension risk (the risk that rising interest rates extend the duration of fixed mortgage-related and other asset-backed securities, making them more sensitive to changes in interest rates), interest rate risk (the risk that rising interest rates will cause a decline in the value of a fixed income security), subprime risk (the risk that these securities have exposure to borrowers with lower credit risk, increasing potential default), prepayment risk (when interest rates decline, borrowers may pay off their mortgages sooner than expected which can reduce the Fund’s returns because the Fund may have to reinvest its assets at lower interest rates), call risk (similar to prepayment risk, an issuer may pay its obligations under a security sooner than expected), U.S. government securities risk (securities backed by different U.S. government agencies are subject to varying levels of credit rating risk), issuer risk (the risk that a private issuer cannot meet its obligations) and stripped mortgage-related securities risk (these securities are particularly sensitive to changes in interest rates).
Inflation Managed Portfolio | Inflation Managed Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the
world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Inflation Managed Portfolio | Inflation Managed Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Inflation Managed Portfolio | Inflation Managed Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
Inflation Managed Portfolio | Inflation Managed Portfolio | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Derivatives Risk: The use of forward commitments, futures contracts, options or swap agreements (each a type of derivative instrument) as a principal investment strategy subjects the Fund to a number of risks, including: counterparty risk, leverage risk, market risk, regulatory risk, liquidity and valuation risk, operational risk, correlation risk, legal risk and premium risk. Derivatives may be riskier than other types of investments and may increase the Fund’s volatility and risk of loss.
Inflation Managed Portfolio | Inflation Managed Portfolio | Leverage Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Leverage Risk: The Fund may invest in forward commitments, futures contracts, options or swap agreements as a principal investment strategy. These derivative investments give rise to a form of leverage. Leverage is investment exposure that exceeds the initial amount invested. The loss on a leveraged investment may far exceed the Fund’s principal amount invested. Leverage can magnify the Fund’s gains and losses and therefore increase its volatility.
Inflation Managed Portfolio | Inflation Managed Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk
of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce the Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
Inflation Managed Portfolio | Inflation Managed Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, the Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, the Fund’s yield (and total return) also may be low and the Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
Inflation Managed Portfolio | Inflation Managed Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
Inflation Managed Portfolio | Inflation Managed Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Inflation Managed Portfolio | Inflation Managed Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Inflation Managed Portfolio | Inflation Managed Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Inflation Managed Portfolio | Inflation Managed Portfolio | Inflation-Indexed Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Inflation-Indexed Debt Securities Risk: The principal values of inflation-indexed debt securities tend to increase when inflation rises and decrease when inflation falls.
Inflation Managed Portfolio | Inflation Managed Portfolio | Convertible Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Convertible Securities Risk: Convertible securities are generally subject to the risks of stocks when the underlying stock price is high relative to the conversion price (because the conversion feature is more valuable) and to the risks of debt securities when the underlying stock price is low relative to the conversion price (because the conversion feature is less valuable). Convertible securities are also generally subject to credit risk, as they tend to be of lower credit quality, and interest rate risk, though they generally are not as sensitive to interest rate changes as conventional debt securities. A convertible security’s value also tends to increase and decrease with the underlying stock and typically has less potential for gain or loss than the underlying stock.
Intermediate Bond Portfolio | Intermediate Bond Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Intermediate Bond Portfolio | Intermediate Bond Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Intermediate Bond Portfolio | Intermediate Bond Portfolio | Mortgage-Related and Other Asset-Backed Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related and other asset-backed securities are subject to certain risks affecting the housing market or the market for the assets underlying such securities. These securities are also subject to extension risk (the risk that rising interest rates extend the duration of fixed mortgage-related and other asset-backed securities, making them more sensitive to changes in interest rates), interest rate risk (the risk that rising interest rates will cause a decline in the value of a fixed income security), subprime risk (the risk that these securities have exposure to borrowers with lower credit risk, increasing potential default), prepayment risk (when interest rates decline, borrowers may pay off their mortgages sooner than expected which can reduce the Fund’s returns because the Fund may have to reinvest its assets at lower interest rates), call risk (similar to prepayment risk, an issuer may pay its obligations under a security sooner than expected), U.S. government securities risk (securities backed by different U.S. government agencies are subject to varying levels of credit rating risk), issuer risk (the risk that a private issuer cannot meet its obligations) and stripped mortgage-related securities risk (these securities are particularly sensitive to changes in interest rates).
Intermediate Bond Portfolio | Intermediate Bond Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in
certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Intermediate Bond Portfolio | Intermediate Bond Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Intermediate Bond Portfolio | Intermediate Bond Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
Intermediate Bond Portfolio | Intermediate Bond Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce the Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
Intermediate Bond Portfolio | Intermediate Bond Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, the Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, the Fund’s yield (and total return) also may be low and the Fund may experience low or negative returns. Debt
instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
Intermediate Bond Portfolio | Intermediate Bond Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
Intermediate Bond Portfolio | Intermediate Bond Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Intermediate Bond Portfolio | Intermediate Bond Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Intermediate Bond Portfolio | Intermediate Bond Portfolio | Geographic Focus Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Geographic Focus Risk: If the Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic, political, social, or other conditions in those countries or that region will have a significant impact on the Fund’s performance. As a result, the Fund’s performance may be more volatile than the performance of more geographically diversified funds.
Short Duration Bond Portfolio | Short Duration Bond Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Short Duration Bond Portfolio | Short Duration Bond Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Short Duration Bond Portfolio | Short Duration Bond Portfolio | Mortgage-Related and Other Asset-Backed Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related and other asset-backed securities are subject to certain risks affecting the housing market or the market for the assets underlying such securities. These securities are also subject to extension risk (the risk that rising interest rates extend the duration of fixed mortgage-related and other asset-backed securities, making them more sensitive to changes in interest rates), interest rate risk (the risk that rising interest rates will cause a decline in the value of a fixed income security), subprime risk (the risk that these securities have exposure to borrowers with lower credit risk, increasing potential default), prepayment risk (when interest rates decline, borrowers may pay off their mortgages sooner than expected which can reduce the Fund’s returns because the Fund may have to reinvest its assets at lower interest rates), call risk (similar to prepayment risk, an issuer may pay its obligations under a security sooner than expected), U.S. government securities risk (securities backed by different U.S. government agencies are subject to varying levels of credit rating risk), issuer risk (the risk that a private issuer cannot meet its obligations) and stripped mortgage-related securities risk (these securities are particularly sensitive to changes in interest rates).
Short Duration Bond Portfolio | Short Duration Bond Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult,
costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Short Duration Bond Portfolio | Short Duration Bond Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Short Duration Bond Portfolio | Short Duration Bond Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
Short Duration Bond Portfolio | Short Duration Bond Portfolio | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Derivatives Risk: The use of futures contracts or swap agreements (each a type of derivative instrument) as a principal investment strategy subjects the Fund to a number of risks, including: counterparty risk, leverage risk, market risk, regulatory risk, liquidity and valuation risk, operational risk, correlation risk, and legal risk. Derivatives may be riskier than other types of investments and may increase the Fund’s volatility and risk of loss.
Short Duration Bond Portfolio | Short Duration Bond Portfolio | Leverage Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Leverage Risk: The Fund may invest in futures contracts or swap agreements as a principal investment strategy. These derivative investments give rise to a form of leverage. Leverage is investment exposure that exceeds the initial amount invested. The loss on a leveraged investment may far exceed the Fund’s principal amount invested. Leverage can magnify the Fund’s gains and losses and therefore increase its volatility.
Short Duration Bond Portfolio | Short Duration Bond Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce the Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
Short Duration Bond Portfolio | Short Duration Bond Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, the Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, the Fund’s yield (and total return) also may be low and the Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
Short Duration Bond Portfolio | Short Duration Bond Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
Short Duration Bond Portfolio | Short Duration Bond Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Short Duration Bond Portfolio | Short Duration Bond Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Short Duration Bond Portfolio | Short Duration Bond Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Total Return Portfolio | Total Return Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Total Return Portfolio | Total Return Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Total Return Portfolio | Total Return Portfolio | Mortgage-Related and Other Asset-Backed Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related and other asset-backed securities are subject to certain risks affecting the housing market or the market for the assets underlying such securities. These securities are also subject to extension risk (the risk that rising interest rates extend the duration of fixed mortgage-related and other asset-backed securities, making them more sensitive to changes in interest rates), interest rate risk (the risk that rising interest rates will cause a decline in the value of a fixed income security), subprime risk (the risk that these securities have exposure to borrowers with lower credit risk, increasing potential default), prepayment risk (when interest rates decline, borrowers may pay off their mortgages sooner than expected which can reduce the Fund’s returns because the Fund may have to reinvest its assets at lower interest rates), call risk (similar to prepayment risk, an issuer may pay its obligations under a security sooner than expected), U.S. government securities risk (securities backed by different U.S. government agencies are subject to varying levels of credit rating risk), issuer risk (the risk that a private issuer cannot meet its obligations) and stripped mortgage-related securities risk (these securities are particularly sensitive to changes in interest rates).
Total Return Portfolio | Total Return Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Total Return Portfolio | Total Return Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Total Return Portfolio | Total Return Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
Total Return Portfolio | Total Return Portfolio | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Derivatives Risk: The use of forward commitments, futures contracts, options or swap agreements (each a type of derivative instrument) as a principal investment strategy subjects the Fund to a number of risks, including: counterparty risk, leverage risk, market risk, regulatory risk, liquidity and
valuation risk, operational risk, correlation risk, legal risk and premium risk. Derivatives may be riskier than other types of investments and may increase the Fund’s volatility and risk of loss.
Total Return Portfolio | Total Return Portfolio | Leverage Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Leverage Risk: The Fund may invest in forward commitments, futures contracts, options or swap agreements as a principal investment strategy. These derivative investments give rise to a form of leverage. Leverage is investment exposure that exceeds the initial amount invested. The loss on a leveraged investment may far exceed the Fund’s principal amount invested. Leverage can magnify the Fund’s gains and losses and therefore increase its volatility.
Total Return Portfolio | Total Return Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce the Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
Total Return Portfolio | Total Return Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, the Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, the Fund’s yield (and total return) also may be low and the Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
Total Return Portfolio | Total Return Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
Total Return Portfolio | Total Return Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Total Return Portfolio | Total Return Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Total Return Portfolio | Total Return Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Total Return Portfolio | Total Return Portfolio | Inflation-Indexed Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Inflation-Indexed Debt Securities Risk: The principal values of inflation-indexed debt securities tend to increase when inflation rises and decrease when inflation falls.
Total Return Portfolio | Total Return Portfolio | Convertible Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Convertible Securities Risk: Convertible securities are generally subject to the risks of stocks when the underlying stock price is high relative to the conversion price (because the conversion feature is more valuable) and to the risks of debt securities when the underlying stock price is low relative to the conversion price (because the conversion feature is less valuable). Convertible securities are also generally subject to credit risk, as they tend to be of lower credit quality, and interest
rate risk, though they generally are not as sensitive to interest rate changes as conventional debt securities. A convertible security’s value also tends to increase and decrease with the underlying stock and typically has less potential for gain or loss than the underlying stock.
Total Return Portfolio | Total Return Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of the Fund’s investments denominated in or with exposure to that foreign currency.
Emerging Markets Debt Portfolio | Emerging Markets Debt Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Emerging Markets Debt Portfolio | Emerging Markets Debt Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Emerging Markets Debt Portfolio | Emerging Markets Debt Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Emerging Markets Debt Portfolio | Emerging Markets Debt Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Emerging Markets Debt Portfolio | Emerging Markets Debt Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
Emerging Markets Debt Portfolio | Emerging Markets Debt Portfolio | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Derivatives Risk: The use of forward commitments, futures contracts, options or swap agreements (each a type of derivative instrument) as a principal investment strategy subjects the Fund to a number of risks, including: counterparty risk, leverage risk, market risk, regulatory risk, liquidity and valuation risk, operational risk, correlation risk, legal risk and premium risk. Derivatives may be riskier than other types of investments and may increase the Fund’s volatility and risk of loss.
Emerging Markets Debt Portfolio | Emerging Markets Debt Portfolio | Leverage Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Leverage Risk: The Fund may invest in forward commitments, futures contracts, options or swap agreements as a principal investment strategy. These derivative investments give rise to a form of leverage. Leverage is investment exposure that exceeds the initial amount invested. The loss on a leveraged investment may far exceed the Fund’s principal amount invested. Leverage can magnify the Fund’s gains and losses and therefore increase its volatility.
Emerging Markets Debt Portfolio | Emerging Markets Debt Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are
non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce the Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
Emerging Markets Debt Portfolio | Emerging Markets Debt Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, the Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, the Fund’s yield (and total return) also may be low and the Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
Emerging Markets Debt Portfolio | Emerging Markets Debt Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Emerging Markets Debt Portfolio | Emerging Markets Debt Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Emerging Markets Debt Portfolio | Emerging Markets Debt Portfolio | High Yield/High Risk or “Junk” Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
High Yield/High Risk or “Junk” Securities Risk: High yield/​high risk securities are typically issued by companies or governments that are highly leveraged, less creditworthy or financially distressed and are considered to be mostly speculative in nature (high risk), subject to greater liquidity risk, and subject to a greater risk of default than higher rated securities. High yield/high risk securities may be more volatile than investment grade securities.
Emerging Markets Debt Portfolio | Emerging Markets Debt Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Emerging Markets Debt Portfolio | Emerging Markets Debt Portfolio | Emerging Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Emerging Markets Risk: Investments in or exposure to investments in emerging market countries may be riskier than investments in or exposure to investments in U.S. and other developed markets for many reasons, including smaller market capitalizations, greater price volatility, less liquidity, lower credit quality, a higher degree of political and economic instability, the impact of economic sanctions, less governmental regulation and supervision of the financial industry and markets, and less stringent financial reporting and accounting standards and controls.
Emerging Markets Debt Portfolio | Emerging Markets Debt Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of the Fund’s investments denominated in or with exposure to that foreign currency.
Emerging Markets Debt Portfolio | Emerging Markets Debt Portfolio | Geographic Focus Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Geographic Focus Risk: If the Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic, political, social, or other conditions in those countries or that region will have a significant impact on the Fund’s performance. As a result, the Fund’s performance may be more volatile than the performance of more geographically diversified funds.
Emerging Markets Debt Portfolio | Emerging Markets Debt Portfolio | Frontier Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Frontier Markets Risk: Frontier markets are those emerging markets considered to be among the smallest and least mature investment markets. Investments in frontier markets are subject to many of the same risks as investments in more mature emerging markets, but generally are less liquid and subject to greater price volatility than investments in more mature emerging markets. This is due to, among other things, smaller economies, less developed capital markets, more market volatility, lower trading volume, greater political or economic instability, less robust regulatory agencies, and more governmental limitations on foreign investments such as trade barriers than typically found in more mature emerging markets or in developed markets.
Dividend Growth Portfolio | Dividend Growth Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Dividend Growth Portfolio | Dividend Growth Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Dividend Growth Portfolio | Dividend Growth Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region. Depositary receipts are also subject to these risks.
Dividend Growth Portfolio | Dividend Growth Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Dividend Growth Portfolio | Dividend Growth Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Dividend Growth Portfolio | Dividend Growth Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Dividend Growth Portfolio | Dividend Growth Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of the Fund’s investments denominated in or with exposure to that foreign currency.
Dividend Growth Portfolio | Dividend Growth Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Dividend Growth Portfolio | Dividend Growth Portfolio | Dividend Oriented Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Dividend-Oriented Companies Risk: Companies that have historically paid regular dividends to shareholders may decrease or eliminate dividend payments in the future, which could reduce the value of the issuer’s stock and the yield of the Fund and lower performance for the Fund.
Dividend Growth Portfolio | Dividend Growth Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Dividend Growth Portfolio | Dividend Growth Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Equity Index Portfolio | Equity Index Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Equity Index Portfolio | Equity Index Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Equity Index Portfolio | Equity Index Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Equity Index Portfolio | Equity Index Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Equity Index Portfolio | Equity Index Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Equity Index Portfolio | Equity Index Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Equity Index Portfolio | Equity Index Portfolio | Tracking Error Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Equity Index Portfolio | Equity Index Portfolio | Industry Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Equity Index Portfolio | Equity Index Portfolio | Non-Diversification Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Equity Index Portfolio | Equity Index Portfolio | Passive Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Equity Index Portfolio | Equity Index Portfolio | Technology Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Technology Sector Risk: Companies in the Technology sector face a number of risks, including operating in rapidly changing fields, abrupt or erratic market movements, limited product lines, markets or financial resources, management that is dependent on a limited number of people, short product cycles, aggressive pricing of products and services, new market entrants and rapid obsolescence of products and services due to technological innovations or changing consumer preferences. In addition, many U.S. companies in the Technology sector have diverse operations, with products or services in foreign markets, exposing them to risks associated with foreign markets.
Focused Growth Portfolio | Focused Growth Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Focused Growth Portfolio | Focused Growth Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Focused Growth Portfolio | Focused Growth Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks
relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Focused Growth Portfolio | Focused Growth Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Focused Growth Portfolio | Focused Growth Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Focused Growth Portfolio | Focused Growth Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Focused Growth Portfolio | Focused Growth Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Focused Growth Portfolio | Focused Growth Portfolio | Emerging Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Emerging Markets Risk: Investments in or exposure to investments in emerging market countries may be riskier than investments in or exposure to investments in U.S. and other developed markets for many reasons, including smaller market capitalizations, greater price volatility, less liquidity, lower credit quality, a higher degree of political and economic instability, the impact of economic sanctions, less governmental regulation and supervision of the financial industry and markets, and less stringent financial reporting and accounting standards and controls.
Focused Growth Portfolio | Focused Growth Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of the Fund’s investments denominated in or with exposure to that foreign currency.
Focused Growth Portfolio | Focused Growth Portfolio | Geographic Focus Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Geographic Focus Risk: If the Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic, political, social, or other conditions in those countries or that region will have a significant impact on the Fund’s performance. As a result, the Fund’s performance may be more volatile than the performance of more geographically diversified funds.
Focused Growth Portfolio | Focused Growth Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Focused Growth Portfolio | Focused Growth Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Focused Growth Portfolio | Focused Growth Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Focused Growth Portfolio | Focused Growth Portfolio | Technology Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Technology Sector Risk: Companies in the Technology sector face a number of risks, including operating in rapidly changing fields, abrupt or erratic market movements, limited product lines, markets or financial resources, management that is dependent on a limited number of people, short product cycles, aggressive pricing of products and services, new market entrants and rapid obsolescence of products and services due to technological innovations or changing consumer preferences. In addition, many U.S. companies in the Technology sector have diverse operations, with products or services in foreign markets, exposing them to risks associated with foreign markets.
Focused Growth Portfolio | Focused Growth Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
Focused Growth Portfolio | Focused Growth Portfolio | Small Number of Holdings Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Focused Growth Portfolio | Focused Growth Portfolio | Communications Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Communications Sector Risk: Companies in the Communications sector may be adversely impacted by rapid obsolescence of products and services as a result of technological improvements and innovations, intense competitive pressures such as pricing and cost competition and technological advancements by competitors, and changing consumer preferences which create unpredictability with supply and demand for a company’s products. Companies in the communications sector may also be affected by outsized research and development costs, substantial capital requirements and changes in government regulation. While all companies are susceptible to cybersecurity breaches, certain companies in the communications sector may be particular targets of hacking and potential theft of information or disruptions in service, which could have a material adverse effect on their businesses.
Focused Growth Portfolio | Focused Growth Portfolio | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Growth Portfolio | Growth Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Growth Portfolio | Growth Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Growth Portfolio | Growth Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Growth Portfolio | Growth Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Growth Portfolio | Growth Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Growth Portfolio | Growth Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Growth Portfolio | Growth Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of the Fund’s investments denominated in or with exposure to that foreign currency.
Growth Portfolio | Growth Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Growth Portfolio | Growth Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Growth Portfolio | Growth Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Growth Portfolio | Growth Portfolio | Technology Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Technology Sector Risk: Companies in the Technology sector face a number of risks, including operating in rapidly changing fields, abrupt or erratic market movements, limited product lines, markets or financial resources, management that is dependent on a limited number of people, short product cycles, aggressive pricing of products and services, new market entrants and rapid obsolescence of products and services due to technological innovations or changing consumer preferences. In addition, many U.S. companies in the Technology sector have diverse operations, with products or services in foreign markets, exposing them to risks associated with foreign markets.
Growth Portfolio | Growth Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
Hedged Equity Portfolio | Hedged Equity Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Hedged Equity Portfolio | Hedged Equity Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Hedged Equity Portfolio | Hedged Equity Portfolio | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Derivatives Risk: The use of futures contracts or options (each a type of derivative instrument) as a principal investment strategy subjects the Fund to a number of risks, including: counterparty risk, leverage risk, market risk, regulatory risk, liquidity and valuation risk, operational risk, correlation risk, legal risk and premium risk. Derivatives may be riskier than other types of investments and may increase the Fund’s volatility and risk of loss.
Hedged Equity Portfolio | Hedged Equity Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Hedged Equity Portfolio | Hedged Equity Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Hedged Equity Portfolio | Hedged Equity Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Hedged Equity Portfolio | Hedged Equity Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Hedged Equity Portfolio | Hedged Equity Portfolio | Technology Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Technology Sector Risk: Companies in the Technology sector face a number of risks, including operating in rapidly changing fields, abrupt or erratic market movements, limited product lines, markets or financial resources, management that is dependent on a limited number of people, short product cycles, aggressive pricing of products and services, new market entrants and rapid obsolescence of products and services due to technological innovations or changing consumer preferences. In addition, many U.S. companies in the Technology sector have diverse operations, with products or services in foreign markets, exposing them to risks associated with foreign markets.
Hedged Equity Portfolio | Hedged Equity Portfolio | Hedged Equity Strategy Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Hedged Equity Strategy Risk: The Fund’s investment strategies may not always provide greater market protection than other equity instruments particularly in rising equity markets when the Fund is expected to underperform traditional long-only equity strategies. In addition, as a result of the structure of the options overlay strategy, the Fund is not expected to provide market protection during times of low market volatility; during such periods, the Fund is expected to perform in line with broad equity markets.
Hedged Equity Portfolio | Hedged Equity Portfolio | Options Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Options Risk: The value of the Fund’s positions in equity index options or options on S&P 500 ETFs will fluctuate in response to changes in the value of the underlying index or security. Writing index call options or options on S&P 500 ETFs can reduce equity securities risk, but it limits the opportunity to profit from an increase in the market value of stocks in exchange for upfront cash at the time of selling the call option. The Fund also risks losing all or part of the cash paid for purchasing put options. Unusual market conditions or the lack of a ready market for any particular option at a specific time may reduce the effectiveness of the Fund’s option strategies, and for these and other reasons, the Fund’s option strategies may not reduce the Fund’s volatility to the extent desired and could result in losses.
Large-Cap Core Portfolio | Large-Cap Core Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Large-Cap Core Portfolio | Large-Cap Core Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Large-Cap Core Portfolio | Large-Cap Core Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region. Depositary receipts are also subject to these risks.
Large-Cap Core Portfolio | Large-Cap Core Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Core Portfolio | Large-Cap Core Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Core Portfolio | Large-Cap Core Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Core Portfolio | Large-Cap Core Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Core Portfolio | Large-Cap Core Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Core Portfolio | Large-Cap Core Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Core Portfolio | Large-Cap Core Portfolio | Technology Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Technology Sector Risk: Companies in the Technology sector face a number of risks, including operating in rapidly changing fields, abrupt or erratic market movements, limited product lines, markets or financial resources, management that is dependent on a limited number of people, short product cycles, aggressive pricing of products and services, new market entrants and rapid obsolescence of products and services due to technological innovations or
changing consumer preferences. In addition, many U.S. companies in the Technology sector have diverse operations, with products or services in foreign markets, exposing them to risks associated with foreign markets.
Large-Cap Core Portfolio | Large-Cap Core Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
Large-Cap Core Portfolio | Large-Cap Core Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Growth Portfolio | Large-Cap Growth Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Large-Cap Growth Portfolio | Large-Cap Growth Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Large-Cap Growth Portfolio | Large-Cap Growth Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition,
foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Large-Cap Growth Portfolio | Large-Cap Growth Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Growth Portfolio | Large-Cap Growth Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Growth Portfolio | Large-Cap Growth Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Growth Portfolio | Large-Cap Growth Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Growth Portfolio | Large-Cap Growth Portfolio | Emerging Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Emerging Markets Risk: Investments in or exposure to investments in emerging market countries may be riskier than investments in or exposure to investments in U.S. and other developed markets for many reasons, including smaller market capitalizations, greater price volatility, less liquidity, lower credit quality, a higher degree of political and economic instability, the impact of economic sanctions, less governmental regulation and supervision of the financial industry and markets, and less stringent financial reporting and accounting standards and controls.
Large-Cap Growth Portfolio | Large-Cap Growth Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of the Fund’s investments denominated in or with exposure to that foreign currency.
Large-Cap Growth Portfolio | Large-Cap Growth Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Large-Cap Growth Portfolio | Large-Cap Growth Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Growth Portfolio | Large-Cap Growth Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Growth Portfolio | Large-Cap Growth Portfolio | Technology Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Technology Sector Risk: Companies in the Technology sector face a number of risks, including operating in rapidly changing fields, abrupt or erratic market movements, limited product lines, markets or financial resources, management that is dependent on a limited number of people, short product cycles, aggressive pricing of products and services, new market entrants and rapid obsolescence of products and services due to technological innovations or changing consumer preferences. In addition, many U.S. companies in the Technology sector have diverse operations, with products or services in foreign markets, exposing them to risks associated with foreign markets.
Large-Cap Growth Portfolio | Large-Cap Growth Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
Large-Cap Growth Portfolio | Large-Cap Growth Portfolio | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Plus Bond Alpha Portfolio | Large-Cap Plus Bond Alpha Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Large-Cap Plus Bond Alpha Portfolio | Large-Cap Plus Bond Alpha Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Large-Cap Plus Bond Alpha Portfolio | Large-Cap Plus Bond Alpha Portfolio | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Non-Diversification Risk: In seeking to gain exposure to the performance of the Index, this portion of the Fund may have exposure to 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, this portion of 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.
Large-Cap Plus Bond Alpha Portfolio | Large-Cap Plus Bond Alpha Portfolio | Restricted Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Restricted Securities Risk: Unless registered for sale to the public under applicable federal securities law, restricted securities such as those issued pursuant to Rule 144A can be sold only in private transactions to qualified purchasers pursuant to an exemption from registration. The sale price realized from a private transaction could be less than the Fund’s purchase price for the restricted security. It may be difficult
to identify a qualified purchaser for a restricted security held by the Fund and such security could be deemed illiquid. It may also be more difficult to value such securities.
Large-Cap Plus Bond Alpha Portfolio | Large-Cap Plus Bond Alpha Portfolio | Mortgage-Related and Other Asset-Backed Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related and other asset-backed securities are subject to certain risks affecting the housing market or the market for the assets underlying such securities. These securities are also subject to extension risk (the risk that rising interest rates extend the duration of fixed mortgage-related and other asset-backed securities, making them more sensitive to changes in interest rates), interest rate risk (the risk that rising interest rates will cause a decline in the value of a fixed income security), subprime risk (the risk that these securities have exposure to borrowers with lower credit risk, increasing potential default), prepayment risk (when interest rates decline, borrowers may pay off their mortgages sooner than expected which can reduce the Fund’s returns because the Fund may have to reinvest its assets at lower interest rates), call risk (similar to prepayment risk, an issuer may pay its obligations under a security sooner than expected), U.S. government securities risk (securities backed by different U.S. government agencies are subject to varying levels of credit rating risk), issuer risk (the risk that a private issuer cannot meet its obligations) and stripped mortgage-related securities risk (these securities are particularly sensitive to changes in interest rates).
Large-Cap Plus Bond Alpha Portfolio | Large-Cap Plus Bond Alpha Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Large-Cap Plus Bond Alpha Portfolio | Large-Cap Plus Bond Alpha Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Plus Bond Alpha Portfolio | Large-Cap Plus Bond Alpha Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
Large-Cap Plus Bond Alpha Portfolio | Large-Cap Plus Bond Alpha Portfolio | Swap Agreements Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Swap Agreements Risk: Swap agreements are derivative contracts where the parties agree to exchange the returns earned on specific assets, such as the return on, or increase in value of, an amount invested in a particular “basket” of securities representing a certain index. As a derivative, it is subject to derivatives risk, including counterparty risk. Although certain standard swap agreements are centrally cleared through an exchange, which is expected to decrease counterparty risk and increase liquidity compared to swaps that are privately negotiated, central clearing does not eliminate these risks. In addition, the Fund’s use of total return swap agreements is subject to market risks based upon changes in the value of the underlying index or reference instrument.
Large-Cap Plus Bond Alpha Portfolio | Large-Cap Plus Bond Alpha Portfolio | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Derivatives Risk: The use of futures contracts, options (FDS managed portion only) or swap agreements (each a type of derivative instrument) as a principal investment strategy subjects the Fund to a number of risks, including: counterparty risk, leverage risk, market risk, regulatory risk, liquidity and valuation risk, operational risk, correlation risk, legal risk and premium risk. Derivatives may be riskier than other types of investments and may increase the Fund’s volatility and risk of loss.
Large-Cap Plus Bond Alpha Portfolio | Large-Cap Plus Bond Alpha Portfolio | Leverage Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Leverage Risk: The Fund may invest in futures contracts, options (FDS managed portion only) or swap agreements as a principal investment strategy. These derivative investments give rise to a form of leverage. Leverage is investment exposure that exceeds the initial amount invested. The loss on a leveraged investment may far exceed the Fund’s principal amount invested. Leverage can magnify the Fund’s gains and losses and therefore increase its volatility.
Large-Cap Plus Bond Alpha Portfolio | Large-Cap Plus Bond Alpha Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce the Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
Large-Cap Plus Bond Alpha Portfolio | Large-Cap Plus Bond Alpha Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, the Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, the Fund’s yield (and total return) also may be low and the Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to
changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
Large-Cap Plus Bond Alpha Portfolio | Large-Cap Plus Bond Alpha Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
Large-Cap Plus Bond Alpha Portfolio | Large-Cap Plus Bond Alpha Portfolio | Financial Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Plus Bond Alpha Portfolio | Large-Cap Plus Bond Alpha Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Plus Bond Alpha Portfolio | Large-Cap Plus Bond Alpha Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Plus Bond Alpha Portfolio | Large-Cap Plus Bond Alpha Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Large-Cap Plus Bond Alpha Portfolio | Large-Cap Plus Bond Alpha Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Plus Bond Alpha Portfolio | Large-Cap Plus Bond Alpha Portfolio | Industry Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Industry Concentration Risk: Concentrating investments in a particular industry or group of industries makes this portion of the Fund more susceptible to adverse economic, business, regulatory or other developments affecting that industry or group of industries, which could negatively impact performance.
Large-Cap Plus Bond Alpha Portfolio | Large-Cap Plus Bond Alpha Portfolio | Technology Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Technology Sector Risk: Companies in the Technology sector face a number of risks, including operating in rapidly changing fields, abrupt or erratic market movements, limited product lines, markets or financial resources, management that is dependent on a limited number of people, short product cycles, aggressive pricing of products and services, new market entrants and rapid obsolescence of products and services due to technological innovations or changing consumer preferences. In addition, many U.S. companies in the Technology sector have diverse operations, with products or services in foreign markets, exposing them to risks associated with foreign markets.
Large-Cap Plus Bond Alpha Portfolio | Large-Cap Plus Bond Alpha Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
Large-Cap Plus Bond Alpha Portfolio | Large-Cap Plus Bond Alpha Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Value Portfolio | Large-Cap Value Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Large-Cap Value Portfolio | Large-Cap Value Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Large-Cap Value Portfolio | Large-Cap Value Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Large-Cap Value Portfolio | Large-Cap Value Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Value Portfolio | Large-Cap Value Portfolio | Financial Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Value Portfolio | Large-Cap Value Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Value Portfolio | Large-Cap Value Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Value Portfolio | Large-Cap Value Portfolio | Emerging Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Emerging Markets Risk: Investments in or exposure to investments in emerging market countries may be riskier than investments in or exposure to investments in U.S. and other developed markets for many reasons, including smaller market capitalizations, greater price volatility, less liquidity, lower credit quality, a higher degree of political and economic instability, the impact of economic sanctions, less governmental regulation and supervision of the financial industry and markets, and less stringent financial reporting and accounting standards and controls.
Large-Cap Value Portfolio | Large-Cap Value Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of the Fund’s investments denominated in or with exposure to that foreign currency.
Large-Cap Value Portfolio | Large-Cap Value Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Large-Cap Value Portfolio | Large-Cap Value Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Large-Cap Value Portfolio | Large-Cap Value Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Mid-Cap Growth Portfolio | Mid-Cap Growth Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Mid-Cap Growth Portfolio | Mid-Cap Growth Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Mid-Cap Growth Portfolio | Mid-Cap Growth Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Mid-Cap Growth Portfolio | Mid-Cap Growth Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Mid-Cap Growth Portfolio | Mid-Cap Growth Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Mid-Cap Growth Portfolio | Mid-Cap Growth Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Mid-Cap Growth Portfolio | Mid-Cap Growth Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Mid-Cap Growth Portfolio | Mid-Cap Growth Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
Mid-Cap Growth Portfolio | Mid-Cap Growth Portfolio | Quantitative Modeling Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Quantitative Modeling Risk: In managing the Fund, the sub-adviser employs quantitative models as an investment management technique. These models examine multiple economic factors using various proprietary and third-party data. The results generated by quantitative analysis may perform differently than expected and may negatively affect Fund performance for various reasons (for example, human judgment, data imprecision, software or other technology malfunctions, or programming inaccuracies). When models and data prove to be incorrect or incomplete, any decisions made in reliance thereon exposes the Fund to potential losses. In addition, in unforeseen or certain low-probability scenarios (often involving a market disruption of some kind), such models may produce unexpected results, which can result in losses for the Fund. There is no guarantee that the sub-adviser’s use of quantitative models will result in effective investment decisions.
Mid-Cap Plus Bond Alpha Portfolio | Mid-Cap Plus Bond Alpha Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Mid-Cap Plus Bond Alpha Portfolio | Mid-Cap Plus Bond Alpha Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Mid-Cap Plus Bond Alpha Portfolio | Mid-Cap Plus Bond Alpha Portfolio | Restricted Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Restricted Securities Risk: Unless registered for sale to the public under applicable federal securities law, restricted securities such as those issued pursuant to Rule 144A can be sold only in private transactions to qualified purchasers pursuant to an exemption from registration. The sale price realized from a private transaction could be less than the Fund’s purchase price for the restricted security. It may be difficult to identify a qualified purchaser for a restricted security held by the Fund and such security could be deemed illiquid. It may also be more difficult to value such securities.
Mid-Cap Plus Bond Alpha Portfolio | Mid-Cap Plus Bond Alpha Portfolio | Mortgage-Related and Other Asset-Backed Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related and other asset-backed securities are subject to certain risks affecting the housing market or the market for the assets underlying such securities. These securities are also subject to extension risk (the risk that rising interest rates extend the duration of fixed mortgage-related and other asset-backed securities, making them more sensitive to changes in interest rates), interest rate risk (the risk that rising interest rates will cause a decline in the value of a fixed income security), subprime risk (the risk that these securities have exposure to borrowers with lower credit risk, increasing potential default), prepayment risk (when interest rates decline, borrowers may pay off their mortgages sooner than expected which can reduce the Fund’s returns because the Fund may have to reinvest its assets at lower interest rates), call risk (similar to prepayment risk, an issuer may pay its obligations under a security sooner than expected), U.S. government securities risk (securities backed by different U.S. government agencies are subject to varying levels of credit rating risk), issuer risk (the risk that a private issuer cannot meet its obligations) and stripped mortgage-related securities risk (these securities are particularly sensitive to changes in interest rates).
Mid-Cap Plus Bond Alpha Portfolio | Mid-Cap Plus Bond Alpha Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Mid-Cap Plus Bond Alpha Portfolio | Mid-Cap Plus Bond Alpha Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Mid-Cap Plus Bond Alpha Portfolio | Mid-Cap Plus Bond Alpha Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
Mid-Cap Plus Bond Alpha Portfolio | Mid-Cap Plus Bond Alpha Portfolio | Swap Agreements Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Swap Agreements Risk: Swap agreements are derivative contracts where the parties agree to exchange the returns earned on specific assets, such as the return on, or increase in value of, an amount invested in a particular “basket” of securities representing a certain index. As a derivative, it is subject to derivatives risk, including counterparty risk. Although certain standard swap agreements are centrally cleared through an exchange, which is expected to decrease counterparty risk and increase liquidity compared to swaps that are privately negotiated, central clearing does not eliminate these risks. In addition, the Fund’s use of total return swap agreements is subject to market risks based upon changes in the value of the underlying index or reference instrument.
Mid-Cap Plus Bond Alpha Portfolio | Mid-Cap Plus Bond Alpha Portfolio | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Derivatives Risk: The use of futures contracts, options (FDS managed portion only) or swap agreements (each a type of derivative instrument) as a principal investment strategy subjects the Fund to a number of risks, including: counterparty risk, leverage risk, market risk, regulatory risk, liquidity and valuation risk, operational risk, correlation risk, legal risk and premium risk. Derivatives may be riskier than other types of investments and may increase the Fund’s volatility and risk of loss.
Mid-Cap Plus Bond Alpha Portfolio | Mid-Cap Plus Bond Alpha Portfolio | Leverage Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Leverage Risk: The Fund may invest in futures contracts, options (FDS managed portion only) or swap agreements as a principal investment strategy. These derivative investments give rise to a form of leverage. Leverage is investment exposure that exceeds the initial amount invested. The loss on a leveraged investment may far exceed the Fund’s principal amount invested. Leverage can magnify the Fund’s gains and losses and therefore increase its volatility.
Mid-Cap Plus Bond Alpha Portfolio | Mid-Cap Plus Bond Alpha Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce the
Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
Mid-Cap Plus Bond Alpha Portfolio | Mid-Cap Plus Bond Alpha Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, the Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, the Fund’s yield (and total return) also may be low and the Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
Mid-Cap Plus Bond Alpha Portfolio | Mid-Cap Plus Bond Alpha Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government
will not make timely payments on its debt or provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
Mid-Cap Plus Bond Alpha Portfolio | Mid-Cap Plus Bond Alpha Portfolio | Financial Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Mid-Cap Plus Bond Alpha Portfolio | Mid-Cap Plus Bond Alpha Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Mid-Cap Plus Bond Alpha Portfolio | Mid-Cap Plus Bond Alpha Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Mid-Cap Plus Bond Alpha Portfolio | Mid-Cap Plus Bond Alpha Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Mid-Cap Plus Bond Alpha Portfolio | Mid-Cap Plus Bond Alpha Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Mid-Cap Plus Bond Alpha Portfolio | Mid-Cap Plus Bond Alpha Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
Mid-Cap Plus Bond Alpha Portfolio | Mid-Cap Plus Bond Alpha Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Mid-Cap Value Portfolio | Mid-Cap Value Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Mid-Cap Value Portfolio | Mid-Cap Value Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Mid-Cap Value Portfolio | Mid-Cap Value Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region. Depositary receipts are also subject to these risks.
Mid-Cap Value Portfolio | Mid-Cap Value Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Mid-Cap Value Portfolio | Mid-Cap Value Portfolio | Financial Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Mid-Cap Value Portfolio | Mid-Cap Value Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Mid-Cap Value Portfolio | Mid-Cap Value Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Mid-Cap Value Portfolio | Mid-Cap Value Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Mid-Cap Value Portfolio | Mid-Cap Value Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Mid-Cap Value Portfolio | Mid-Cap Value Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
QQQ Plus Bond Alpha Portfolio | QQQ Plus Bond Alpha Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
QQQ Plus Bond Alpha Portfolio | QQQ Plus Bond Alpha Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
QQQ Plus Bond Alpha Portfolio | QQQ Plus Bond Alpha Portfolio | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Non-Diversification Risk: In seeking to gain exposure to the performance of the Nasdaq-100 Indices, this portion of the Fund may have exposure to 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, this portion of 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.
QQQ Plus Bond Alpha Portfolio | QQQ Plus Bond Alpha Portfolio | Restricted Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Restricted Securities Risk: Unless registered for sale to the public under applicable federal securities law, restricted securities such as those issued pursuant to Rule 144A can be sold only in private transactions to qualified purchasers pursuant to an exemption from registration. The sale price realized from a private transaction could be less than the Fund’s purchase price for the restricted security. It may be difficult to identify a qualified purchaser for a restricted security held by the Fund and such security could be deemed illiquid. It may also be more difficult to value such securities.
QQQ Plus Bond Alpha Portfolio | QQQ Plus Bond Alpha Portfolio | Mortgage-Related and Other Asset-Backed Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related and other asset-backed securities are subject to certain risks affecting the housing market or the market for the assets underlying such securities. These securities are also subject to extension risk (the risk that rising interest rates extend the duration of fixed mortgage-related and other asset-backed securities, making them more sensitive to changes in interest rates), interest rate risk (the risk that rising interest rates will cause a decline in the value of a fixed income security), subprime risk (the risk that these securities have exposure to borrowers with lower credit risk, increasing potential default), prepayment risk (when interest rates decline, borrowers may pay off their mortgages sooner than expected which can reduce the Fund’s returns because the Fund may have to reinvest its assets at lower interest rates), call risk (similar
to prepayment risk, an issuer may pay its obligations under a security sooner than expected), U.S. government securities risk (securities backed by different U.S. government agencies are subject to varying levels of credit rating risk), issuer risk (the risk that a private issuer cannot meet its obligations) and stripped mortgage-related securities risk (these securities are particularly sensitive to changes in interest rates).
QQQ Plus Bond Alpha Portfolio | QQQ Plus Bond Alpha Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
QQQ Plus Bond Alpha Portfolio | QQQ Plus Bond Alpha Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
QQQ Plus Bond Alpha Portfolio | QQQ Plus Bond Alpha Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
QQQ Plus Bond Alpha Portfolio | QQQ Plus Bond Alpha Portfolio | Swap Agreements Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Swap Agreements Risk: Swap agreements are derivative contracts where the parties agree to exchange the returns earned on specific assets, such as the return on, or increase in value of, an amount invested in a particular “basket” of securities representing a certain index. As a derivative, it is subject to derivatives risk, including counterparty risk. Although certain standard swap agreements are centrally cleared through an exchange, which is expected to decrease counterparty risk and increase liquidity compared to swaps that are privately negotiated, central clearing does not eliminate these risks. In addition, the Fund’s use of total return swap agreements is subject to market risks based upon changes in the value of the underlying index or reference instrument.
QQQ Plus Bond Alpha Portfolio | QQQ Plus Bond Alpha Portfolio | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Derivatives Risk: The use of futures contracts, options (FDS managed portion only) or swap agreements (each a type of derivative instrument) as a principal investment strategy subjects the Fund to a number of risks, including: counterparty risk, leverage risk, market risk, regulatory risk, liquidity and valuation risk, operational risk, correlation risk, legal risk and premium risk. Derivatives may be riskier than other types of investments and may increase the Fund’s volatility and risk of loss.
QQQ Plus Bond Alpha Portfolio | QQQ Plus Bond Alpha Portfolio | Leverage Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Leverage Risk: The Fund may invest in futures contracts, options (FDS managed portion only) or swap agreements as a principal investment strategy. These derivative investments give rise to a form of leverage. Leverage is investment exposure that exceeds the initial amount invested. The loss on a leveraged investment may far exceed the Fund’s principal amount invested. Leverage can magnify the Fund’s gains and losses and therefore increase its volatility.
QQQ Plus Bond Alpha Portfolio | QQQ Plus Bond Alpha Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce the Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
QQQ Plus Bond Alpha Portfolio | QQQ Plus Bond Alpha Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, the Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, the Fund’s yield (and total return) also may be low and the Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
QQQ Plus Bond Alpha Portfolio | QQQ Plus Bond Alpha Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
QQQ Plus Bond Alpha Portfolio | QQQ Plus Bond Alpha Portfolio | Financial Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
QQQ Plus Bond Alpha Portfolio | QQQ Plus Bond Alpha Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
QQQ Plus Bond Alpha Portfolio | QQQ Plus Bond Alpha Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
QQQ Plus Bond Alpha Portfolio | QQQ Plus Bond Alpha Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
QQQ Plus Bond Alpha Portfolio | QQQ Plus Bond Alpha Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
QQQ Plus Bond Alpha Portfolio | QQQ Plus Bond Alpha Portfolio | Industry Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Industry Concentration Risk: Concentrating investments in a particular industry or group of industries makes this portion of the Fund more susceptible to adverse economic, business, regulatory or other developments affecting that industry or group of industries, which could negatively impact performance.
QQQ Plus Bond Alpha Portfolio | QQQ Plus Bond Alpha Portfolio | Technology Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Technology Sector Risk: Companies in the Technology sector face a number of risks, including operating in rapidly changing fields, abrupt or erratic market movements, limited product lines, markets or financial resources, management that is dependent on a limited number of people, short product cycles, aggressive pricing of products and services, new market entrants and rapid obsolescence of products and services due to technological innovations or changing consumer preferences. In addition, many U.S. companies in the Technology sector have diverse operations, with products or services in foreign markets, exposing them to risks associated with foreign markets.
QQQ Plus Bond Alpha Portfolio | QQQ Plus Bond Alpha Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
Small-Cap Equity Portfolio | Small-Cap Equity Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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 Equity Portfolio | Small-Cap Equity Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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 Equity Portfolio | Small-Cap Equity Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may
adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region. Depositary receipts are also subject to these risks.
Small-Cap Equity Portfolio | Small-Cap Equity Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Equity Portfolio | Small-Cap Equity Portfolio | Financial Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Small-Cap Equity Portfolio | Small-Cap Equity Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 this portion of the Fund’s performance.
Small-Cap Equity Portfolio | Small-Cap Equity Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Equity Portfolio | Small-Cap Equity Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Equity Portfolio | Small-Cap Equity Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of this portion of the Fund’s investments denominated in or with exposure to that foreign currency.
Small-Cap Equity Portfolio | Small-Cap Equity Portfolio | Conflicts of Interest Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Conflicts of Interest Risk: PLFA is subject to competing interests that have the potential to influence its investment decisions for the Fund with regard to the allocation of Fund assets among the two strategies. For example, the use of one strategy of the Fund that provides greater profitability to PLFA than the other may create an incentive for PLFA to use that strategy. PLFA seeks to identify and address any potential conflicts in a manner that is fair to the Fund and its shareholders. PLFA has adopted a policy under which investment decisions for the Fund must be made in the best interests of the Fund and its shareholders.
Small-Cap Equity Portfolio | Small-Cap Equity Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Small-Cap Equity Portfolio | Small-Cap Equity Portfolio | Tracking Error Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Tracking Error Risk: Performance of this portion of the Fund may vary from the performance of the index for which it seeks corresponding investment results due to imperfect correlation between this portion of the Fund’s investments and that index.
Small-Cap Equity Portfolio | Small-Cap Equity Portfolio | Industry Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Industry Concentration Risk: Concentrating investments in a particular industry or group of industries makes this portion of 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 Equity Portfolio | Small-Cap Equity Portfolio | Passive Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Passive Management Risk: This portion of the Fund is passively managed (or indexed) and therefore, regardless of performance, generally holds constituent securities of the index for which this portion of the Fund seeks corresponding investment results, which could cause this portion of the Fund’s return to be lower than an actively managed fund (which generally seeks to outperform an index). This portion of the Fund will also perform poorly when the index performs poorly. In addition, this indexed portion of the Fund has operating and other expenses while an index does not. As such, this portion of the 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 Equity Portfolio | Small-Cap Equity Portfolio | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Equity Portfolio | Small-Cap Equity Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Small-Cap Equity Portfolio | Small-Cap Equity Portfolio | ESG Considerations Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
ESG Considerations Risk: ESG considerations are one of a number of factors that Franklin examines when considering investments for this portion of the Fund and therefore the issuers in which this portion of the Fund invests may not be considered ESG-focused issuers. In addition, if considered, ESG considerations assessed as part of Franklin’s investment process may vary across types of eligible investments and issuers and not every ESG factor may be identified or evaluated for every investment in this portion of the Fund. The incorporation of ESG factors may affect this portion of the Fund’s exposure to certain issuers or industries and may not work as intended. This portion of the Fund may underperform other funds that do not assess an issuer’s ESG factors or that use a different methodology to identify and/or incorporate ESG factors. Information used by this portion of the Fund to evaluate such factors may not be readily available, complete or accurate, and may vary across providers and issuers as ESG is not a uniformly defined characteristic. While Franklin views ESG considerations as having the potential to contribute to this portion of the Fund’s long-term performance, there is no guarantee that the evaluation of ESG considerations will be additive to this portion of the Fund’s performance. In addition, regulations and industry practices related to ESG are evolving rapidly, and Franklin’s practices may change if required to comply with such regulations or adopt such practices.
Small-Cap Equity Portfolio | Small-Cap Equity Portfolio | Index Sampling Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Growth Portfolio | Small-Cap Growth Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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 Growth Portfolio | Small-Cap Growth Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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 Growth Portfolio | Small-Cap Growth Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region. Depositary receipts are also subject to these risks.
Small-Cap Growth Portfolio | Small-Cap Growth Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Growth Portfolio | Small-Cap Growth Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Small-Cap Growth Portfolio | Small-Cap Growth Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Growth Portfolio | Small-Cap Growth Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Growth Portfolio | Small-Cap Growth Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of the Fund’s investments denominated in or with exposure to that foreign currency.
Small-Cap Growth Portfolio | Small-Cap Growth Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Small-Cap Growth Portfolio | Small-Cap Growth Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
Small-Cap Growth Portfolio | Small-Cap Growth Portfolio | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Growth Portfolio | Small-Cap Growth Portfolio | Consumer Non-Cyclical Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Consumer Non-Cyclical Sector Risk: Companies in the Consumer Non-cyclical products and services sector (which are generally considered essential staples) may be adversely impacted by changes in domestic and global economic conditions, consumer confidence and preferences, disposable household income and consumer spending, product cycles, marketing, demographics, production spending, competition, government regulations and factors impacting the supply, demand and prices of raw materials.
Small-Cap Index Portfolio | Small-Cap Index Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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]  
Risk [Text Block] 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 | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Tracking Error Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Industry Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Passive Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Index Sampling Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Plus Bond Alpha Portfolio | Small-Cap Plus Bond Alpha Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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 Plus Bond Alpha Portfolio | Small-Cap Plus Bond Alpha Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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 Plus Bond Alpha Portfolio | Small-Cap Plus Bond Alpha Portfolio | Restricted Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Restricted Securities Risk: Unless registered for sale to the public under applicable federal securities law, restricted securities such as those issued pursuant to Rule 144A can be sold only in private transactions to qualified purchasers pursuant to an exemption from registration. The sale price realized from a private transaction could be less than the Fund’s purchase price for the restricted security. It may be difficult to identify a qualified purchaser for a restricted security held by the Fund and such security could be deemed illiquid. It may also be more difficult to value such securities.
Small-Cap Plus Bond Alpha Portfolio | Small-Cap Plus Bond Alpha Portfolio | Mortgage-Related and Other Asset-Backed Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related and other asset-backed securities are subject to certain risks affecting the housing market or the market for the assets underlying such securities. These securities are also subject to extension risk (the risk that rising interest rates extend the duration of fixed mortgage-related and other asset-backed securities, making them more sensitive to changes in interest rates), interest rate risk (the risk that rising interest rates will cause a decline in the value of a fixed income security), subprime risk (the risk that these securities have exposure to borrowers with lower credit risk, increasing potential default), prepayment risk (when interest rates decline, borrowers may pay off their mortgages sooner than expected which can reduce the Fund’s returns because the Fund may have to reinvest its assets at lower interest rates), call risk (similar to prepayment risk, an issuer may pay its obligations under a security sooner than expected), U.S. government securities risk (securities backed by different U.S. government agencies are subject to varying levels of credit rating risk), issuer risk
(the risk that a private issuer cannot meet its obligations) and stripped mortgage-related securities risk (these securities are particularly sensitive to changes in interest rates).
Small-Cap Plus Bond Alpha Portfolio | Small-Cap Plus Bond Alpha Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Small-Cap Plus Bond Alpha Portfolio | Small-Cap Plus Bond Alpha Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Plus Bond Alpha Portfolio | Small-Cap Plus Bond Alpha Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
Small-Cap Plus Bond Alpha Portfolio | Small-Cap Plus Bond Alpha Portfolio | Swap Agreements Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Swap Agreements Risk: Swap agreements are derivative contracts where the parties agree to exchange the returns earned on specific assets, such as the return on, or increase in value of, an amount invested in a particular “basket” of securities representing a certain index. As a derivative, it is subject to derivatives risk, including counterparty risk. Although certain standard swap agreements are centrally cleared through an exchange, which is expected to decrease counterparty risk and increase liquidity compared to swaps that are privately negotiated, central clearing does not eliminate these risks. In addition, the Fund’s use of total return swap agreements is subject to market risks based upon changes in the value of the underlying index or reference instrument.
Small-Cap Plus Bond Alpha Portfolio | Small-Cap Plus Bond Alpha Portfolio | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Derivatives Risk: The use of futures contracts, options (FDS managed portion only) or swap agreements (each a type of derivative instrument) as a principal investment strategy subjects the Fund to a number of risks, including: counterparty risk, leverage risk, market risk, regulatory risk, liquidity and valuation risk, operational risk, correlation risk, legal risk and premium risk. Derivatives may be riskier than other types of investments and may increase the Fund’s volatility and risk of loss.
Small-Cap Plus Bond Alpha Portfolio | Small-Cap Plus Bond Alpha Portfolio | Leverage Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Leverage Risk: The Fund may invest in futures contracts, options (FDS managed portion only) or swap agreements as a principal investment strategy. These derivative investments give rise to a form of leverage. Leverage is investment exposure that exceeds the initial amount invested. The loss on a
leveraged investment may far exceed the Fund’s principal amount invested. Leverage can magnify the Fund’s gains and losses and therefore increase its volatility.
Small-Cap Plus Bond Alpha Portfolio | Small-Cap Plus Bond Alpha Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce the Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
Small-Cap Plus Bond Alpha Portfolio | Small-Cap Plus Bond Alpha Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, the Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, the Fund’s yield (and total return) also may be low and the Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
Small-Cap Plus Bond Alpha Portfolio | Small-Cap Plus Bond Alpha Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
Small-Cap Plus Bond Alpha Portfolio | Small-Cap Plus Bond Alpha Portfolio | Financial Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Small-Cap Plus Bond Alpha Portfolio | Small-Cap Plus Bond Alpha Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Small-Cap Plus Bond Alpha Portfolio | Small-Cap Plus Bond Alpha Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Plus Bond Alpha Portfolio | Small-Cap Plus Bond Alpha Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Plus Bond Alpha Portfolio | Small-Cap Plus Bond Alpha Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Small-Cap Plus Bond Alpha Portfolio | Small-Cap Plus Bond Alpha Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
Small-Cap Plus Bond Alpha Portfolio | Small-Cap Plus Bond Alpha Portfolio | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Plus Bond Alpha Portfolio | Small-Cap Plus Bond Alpha Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Small-Cap Value Portfolio | Small-Cap Value Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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 Value Portfolio | Small-Cap Value Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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 Value Portfolio | Small-Cap Value Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Value Portfolio | Small-Cap Value Portfolio | Financial Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Small-Cap Value Portfolio | Small-Cap Value Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Small-Cap Value Portfolio | Small-Cap Value Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Value Portfolio | Small-Cap Value Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Value Portfolio | Small-Cap Value Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Small-Cap Value Portfolio | Small-Cap Value Portfolio | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Value Portfolio | Small-Cap Value Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Portfolio | Value Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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 Portfolio | Value Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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 Portfolio | Value Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Portfolio | Value Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Portfolio | Value Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Portfolio | Value Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 in which this portion of the Fund invests 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 Portfolio | Value Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Portfolio | Value Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Portfolio | Value Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 Portfolio | Value Portfolio | Consumer Non-Cyclical Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Consumer Non-Cyclical Sector Risk: Companies in the Consumer Non-cyclical products and services sector (which are generally considered essential staples) may be adversely impacted by changes in domestic and global economic conditions, consumer confidence and preferences, disposable household income and consumer spending, product cycles, marketing, demographics, production spending, competition, government regulations and factors impacting the supply, demand and prices of raw materials.
Value Advantage Portfolio | Value Advantage Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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]  
Risk [Text Block] 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 | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Financial Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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]  
Risk [Text Block]
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 | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Emerging Markets Portfolio | Emerging Markets Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Emerging Markets Portfolio | Emerging Markets Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Emerging Markets Portfolio | Emerging Markets Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general
supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region. Depositary receipts are also subject to these risks.
Emerging Markets Portfolio | Emerging Markets Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Emerging Markets Portfolio | Emerging Markets Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Emerging Markets Portfolio | Emerging Markets Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Emerging Markets Portfolio | Emerging Markets Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Emerging Markets Portfolio | Emerging Markets Portfolio | Emerging Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Emerging Markets Risk: Investments in or exposure to investments in emerging market countries may be riskier than investments in or exposure to investments in U.S. and other developed markets for many reasons, including smaller market capitalizations, greater price volatility, less liquidity, lower credit quality, a higher degree of political and economic instability, the impact of economic sanctions, less governmental regulation and supervision of the financial industry and markets, and less stringent financial reporting and accounting standards and controls.
Emerging Markets Portfolio | Emerging Markets Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of the Fund’s investments denominated in or with exposure to that foreign currency.
Emerging Markets Portfolio | Emerging Markets Portfolio | Geographic Focus Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Geographic Focus Risk: If the Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic, political, social, or other conditions in those countries or that region will have a significant impact on the Fund’s performance. As a result, the Fund’s performance may be more volatile than the performance of more geographically diversified funds.
Emerging Markets Portfolio | Emerging Markets Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Emerging Markets Portfolio | Emerging Markets Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Emerging Markets Portfolio | Emerging Markets Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Emerging Markets Portfolio | Emerging Markets Portfolio | Technology Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Technology Sector Risk: Companies in the Technology sector face a number of risks, including operating in rapidly changing fields, abrupt or erratic market movements, limited product lines, markets or financial resources, management that is dependent on a limited number of people, short product cycles, aggressive pricing of products and services, new market entrants and rapid obsolescence of products and services due to technological innovations or changing consumer preferences. In addition, many U.S. companies in the Technology sector have diverse operations, with products or services in foreign markets, exposing them to risks associated with foreign markets.
Emerging Markets Portfolio | Emerging Markets Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
Emerging Markets Portfolio | Emerging Markets Portfolio | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Emerging Markets Portfolio | Emerging Markets Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Emerging Markets Portfolio | Emerging Markets Portfolio | Quantitative Modeling Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Quantitative Modeling Risk: In managing the Fund, the sub-adviser employs quantitative models as an investment management technique. These models examine multiple economic factors using various proprietary and third-party data. The results generated by quantitative analysis may perform differently than expected and may negatively affect Fund performance for various reasons (for example, human judgment, data imprecision, software or other technology malfunctions, or programming inaccuracies). When models and data prove to be incorrect or incomplete, any decisions made in reliance thereon exposes the Fund to potential losses. In addition, in unforeseen or certain low-probability scenarios (often involving a market disruption of some kind), such models may produce unexpected results, which can result in losses for the Fund. There is no guarantee that the sub-adviser’s use of quantitative models will result in effective investment decisions.
Emerging Markets Portfolio | Emerging Markets Portfolio | China Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
China Risk: Because the Fund has principal exposure to investments (both directly and indirectly) involving China, the Fund may be impacted by social, economic and political conditions impacting China, including international relations with other nations, public health risks, corruption and military activity, market illiquidity, exchange-rate fluctuations, volatility, and the potential for limited disclosure and regulation involving Chinese securities.
International Equity Plus Bond Alpha Portfolio | International Equity Plus Bond Alpha Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
International Equity Plus Bond Alpha Portfolio | International Equity Plus Bond Alpha Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
International Equity Plus Bond Alpha Portfolio | International Equity Plus Bond Alpha Portfolio | Restricted Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Restricted Securities Risk: Unless registered for sale to the public under applicable federal securities law, restricted securities such as those issued pursuant to Rule 144A can be sold only in private transactions to qualified purchasers pursuant to an exemption from registration. The sale price realized from a private transaction could be less than the Fund’s purchase price for the restricted security. It may be difficult
to identify a qualified purchaser for a restricted security held by the Fund and such security could be deemed illiquid. It may also be more difficult to value such securities.
International Equity Plus Bond Alpha Portfolio | International Equity Plus Bond Alpha Portfolio | Mortgage-Related and Other Asset-Backed Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related and other asset-backed securities are subject to certain risks affecting the housing market or the market for the assets underlying such securities. These securities are also subject to extension risk (the risk that rising interest rates extend the duration of fixed mortgage-related and other asset-backed securities, making them more sensitive to changes in interest rates), interest rate risk (the risk that rising interest rates will cause a decline in the value of a fixed income security), subprime risk (the risk that these securities have exposure to borrowers with lower credit risk, increasing potential default), prepayment risk (when interest rates decline, borrowers may pay off their mortgages sooner than expected which can reduce the Fund’s returns because the Fund may have to reinvest its assets at lower interest rates), call risk (similar to prepayment risk, an issuer may pay its obligations under a security sooner than expected), U.S. government securities risk (securities backed by different U.S. government agencies are subject to varying levels of credit rating risk), issuer risk (the risk that a private issuer cannot meet its obligations) and stripped mortgage-related securities risk (these securities are particularly sensitive to changes in interest rates).
International Equity Plus Bond Alpha Portfolio | International Equity Plus Bond Alpha Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
International Equity Plus Bond Alpha Portfolio | International Equity Plus Bond Alpha Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Equity Plus Bond Alpha Portfolio | International Equity Plus Bond Alpha Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
International Equity Plus Bond Alpha Portfolio | International Equity Plus Bond Alpha Portfolio | Swap Agreements Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Swap Agreements Risk: Swap agreements are derivative contracts where the parties agree to exchange the returns earned on specific assets, such as the return on, or increase in value of, an amount invested in a particular “basket” of securities representing a certain index. As a derivative, it is subject to derivatives risk, including counterparty risk. Although certain standard swap agreements are centrally cleared through an exchange, which is expected to decrease counterparty risk and increase liquidity compared to swaps that are privately negotiated, central clearing does not eliminate these risks. In addition, the Fund’s use of total return swap agreements is subject to market risks based upon changes in the value of the underlying index or reference instrument.
International Equity Plus Bond Alpha Portfolio | International Equity Plus Bond Alpha Portfolio | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Derivatives Risk: The use of futures contracts, options (FDS managed portion only) or swap agreements (each a type of derivative instrument) as a principal investment strategy subjects the Fund to a number of risks, including: counterparty risk, leverage risk, market risk, regulatory risk, liquidity and valuation risk, operational risk, correlation risk, legal risk and premium risk. Derivatives may be riskier than other types of investments and may increase the Fund’s volatility and risk of loss.
International Equity Plus Bond Alpha Portfolio | International Equity Plus Bond Alpha Portfolio | Leverage Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Leverage Risk: The Fund may invest in futures contracts, options (FDS managed portion only) or swap agreements as a principal investment strategy. These derivative investments give rise to a form of leverage. Leverage is investment exposure that exceeds the initial amount invested. The loss on a
leveraged investment may far exceed the Fund’s principal amount invested. Leverage can magnify the Fund’s gains and losses and therefore increase its volatility.
International Equity Plus Bond Alpha Portfolio | International Equity Plus Bond Alpha Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce the Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
International Equity Plus Bond Alpha Portfolio | International Equity Plus Bond Alpha Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, the Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, the Fund’s yield (and total return) also may be low and the Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
International Equity Plus Bond Alpha Portfolio | International Equity Plus Bond Alpha Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
International Equity Plus Bond Alpha Portfolio | International Equity Plus Bond Alpha Portfolio | Financial Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Equity Plus Bond Alpha Portfolio | International Equity Plus Bond Alpha Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Equity Plus Bond Alpha Portfolio | International Equity Plus Bond Alpha Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Equity Plus Bond Alpha Portfolio | International Equity Plus Bond Alpha Portfolio | Geographic Focus Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Geographic Focus Risk: If the Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic, political, social, or other conditions in those countries or that region will have a significant impact on the Fund’s performance. As a result, the Fund’s performance may be more volatile than the performance of more geographically diversified funds.
International Equity Plus Bond Alpha Portfolio | International Equity Plus Bond Alpha Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
International Equity Plus Bond Alpha Portfolio | International Equity Plus Bond Alpha Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Equity Plus Bond Alpha Portfolio | International Equity Plus Bond Alpha Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Equity Plus Bond Alpha Portfolio | International Equity Plus Bond Alpha Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
International Equity Plus Bond Alpha Portfolio | International Equity Plus Bond Alpha Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Growth Portfolio | International Growth Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
International Growth Portfolio | International Growth Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
International Growth Portfolio | International Growth Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region. Depositary receipts are also subject to these risks.
International Growth Portfolio | International Growth Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Growth Portfolio | International Growth Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Growth Portfolio | International Growth Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Growth Portfolio | International Growth Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Growth Portfolio | International Growth Portfolio | Emerging Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Emerging Markets Risk: Investments in or exposure to investments in emerging market countries may be riskier than investments in or exposure to investments in U.S. and other developed markets for many reasons, including smaller market capitalizations, greater price volatility, less liquidity, lower credit quality, a higher degree of political and economic instability, the impact of economic sanctions, less governmental regulation and supervision of the financial industry and markets, and less stringent financial reporting and accounting standards and controls.
International Growth Portfolio | International Growth Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of the Fund’s investments denominated in or with exposure to that foreign currency.
International Growth Portfolio | International Growth Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
International Growth Portfolio | International Growth Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Growth Portfolio | International Growth Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Growth Portfolio | International Growth Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
International Growth Portfolio | International Growth Portfolio | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Growth Portfolio | International Growth Portfolio | Consumer Non-Cyclical Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Consumer Non-Cyclical Sector Risk: Companies in the Consumer Non-cyclical products and services sector (which are generally considered essential staples) may be adversely impacted by changes in domestic and global economic conditions, consumer confidence and preferences, disposable household income and consumer spending, product cycles, marketing, demographics, production spending, competition, government regulations and factors impacting the supply, demand and prices of raw materials.
International Large-Cap Portfolio | International Large-Cap Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
International Large-Cap Portfolio | International Large-Cap Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
International Large-Cap Portfolio | International Large-Cap Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region. Depositary receipts are also subject to these risks.
International Large-Cap Portfolio | International Large-Cap Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Large-Cap Portfolio | International Large-Cap Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Large-Cap Portfolio | International Large-Cap Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Large-Cap Portfolio | International Large-Cap Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Large-Cap Portfolio | International Large-Cap Portfolio | Emerging Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Emerging Markets Risk: Investments in or exposure to investments in emerging market countries may be riskier than investments in or exposure to investments in U.S. and other developed markets for many reasons, including smaller market capitalizations, greater price volatility, less liquidity, lower credit quality, a higher degree of political and economic instability, the impact of economic sanctions, less governmental regulation and supervision of the financial industry and markets, and less stringent financial reporting and accounting standards and controls.
International Large-Cap Portfolio | International Large-Cap Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of the Fund’s investments denominated in or with exposure to that foreign currency.
International Large-Cap Portfolio | International Large-Cap Portfolio | Geographic Focus Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Geographic Focus Risk: If the Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic, political, social, or other conditions in those countries or that region will have a significant impact on the Fund’s performance. As a result, the Fund’s performance may be more volatile than the performance of more geographically diversified funds.
International Large-Cap Portfolio | International Large-Cap Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
International Large-Cap Portfolio | International Large-Cap Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Large-Cap Portfolio | International Large-Cap Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
International Large-Cap Portfolio | International Large-Cap Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Large-Cap Portfolio | International Large-Cap Portfolio | Consumer Non-Cyclical Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Consumer Non-Cyclical Sector Risk: Companies in the Consumer Non-cyclical products and services sector (which are generally considered essential staples) may be adversely impacted by changes in domestic and global economic conditions, consumer confidence and preferences, disposable household income and consumer spending, product cycles, marketing, demographics, production spending, competition, government regulations and factors impacting the supply, demand and prices of raw materials.
International Small-Cap Portfolio | International Small-Cap Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
International Small-Cap Portfolio | International Small-Cap Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
International Small-Cap Portfolio | International Small-Cap Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
International Small-Cap Portfolio | International Small-Cap Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Small-Cap Portfolio | International Small-Cap Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Small-Cap Portfolio | International Small-Cap Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Small-Cap Portfolio | International Small-Cap Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Small-Cap Portfolio | International Small-Cap Portfolio | Emerging Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Emerging Markets Risk: Investments in or exposure to investments in emerging market countries may be riskier than investments in or exposure to investments in U.S. and other developed markets for many reasons, including smaller market capitalizations, greater price volatility, less liquidity, lower credit quality, a higher degree of political and economic instability, the impact of economic sanctions, less governmental regulation and supervision of the financial industry and markets, and less stringent financial reporting and accounting standards and controls.
International Small-Cap Portfolio | International Small-Cap Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of the Fund’s investments denominated in or with exposure to that foreign currency.
International Small-Cap Portfolio | International Small-Cap Portfolio | Geographic Focus Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Geographic Focus Risk: If the Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic, political, social, or other conditions in those countries or that region will have a significant impact
on the Fund’s performance. As a result, the Fund’s performance may be more volatile than the performance of more geographically diversified funds.
International Small-Cap Portfolio | International Small-Cap Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
International Small-Cap Portfolio | International Small-Cap Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
International Small-Cap Portfolio | International Small-Cap Portfolio | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Small-Cap Portfolio | International Small-Cap Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Value Portfolio | International Value Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
International Value Portfolio | International Value Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
International Value Portfolio | International Value Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region. Depositary receipts are also subject to these risks.
International Value Portfolio | International Value Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Value Portfolio | International Value Portfolio | Financial Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Value Portfolio | International Value Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Value Portfolio | International Value Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Value Portfolio | International Value Portfolio | Emerging Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Emerging Markets Risk: Investments in or exposure to investments in emerging market countries may be riskier than investments in or exposure to investments in U.S. and other developed markets for many reasons, including smaller market capitalizations, greater price volatility, less liquidity, lower credit quality, a higher degree of political and economic instability, the impact of economic sanctions, less governmental
regulation and supervision of the financial industry and markets, and less stringent financial reporting and accounting standards and controls.
International Value Portfolio | International Value Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of the Fund’s investments denominated in or with exposure to that foreign currency.
International Value Portfolio | International Value Portfolio | Geographic Focus Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Geographic Focus Risk: If the Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic, political, social, or other conditions in those countries or that region will have a significant impact on the Fund’s performance. As a result, the Fund’s performance may be more volatile than the performance of more geographically diversified funds.
International Value Portfolio | International Value Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
International Value Portfolio | International Value Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Value Portfolio | International Value Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
International Value Portfolio | International Value Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Health Sciences Portfolio | Health Sciences Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Health Sciences Portfolio | Health Sciences Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Health Sciences Portfolio | Health Sciences Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be
​
particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Health Sciences Portfolio | Health Sciences Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Health Sciences Portfolio | Health Sciences Portfolio | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Derivatives Risk: The use of forward commitments (a type of derivative instrument) as a principal investment strategy subjects the Fund to a number of risks, including: counterparty risk, leverage risk, market risk, regulatory risk, liquidity and valuation risk, operational risk, correlation risk, and legal risk. Derivatives may be riskier than other types of investments and may increase the Fund’s volatility and risk of loss.
Health Sciences Portfolio | Health Sciences Portfolio | Leverage Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Leverage Risk: The Fund may invest in forward commitments as a principal investment strategy. These derivative investments give rise to a form of leverage. Leverage is investment exposure that exceeds the initial amount invested. The loss on a leveraged investment may far exceed the Fund’s principal amount invested. Leverage can magnify the Fund’s gains and losses and therefore increase its volatility.
Health Sciences Portfolio | Health Sciences Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Health Sciences Portfolio | Health Sciences Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Health Sciences Portfolio | Health Sciences Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Health Sciences Portfolio | Health Sciences Portfolio | Emerging Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Emerging Markets Risk: Investments in or exposure to investments in emerging market countries may be riskier than investments in or exposure to investments in U.S. and other developed markets for many reasons, including smaller market capitalizations, greater price volatility, less liquidity, lower credit quality, a higher degree of political and economic instability, the impact of economic sanctions, less governmental regulation and supervision of the financial industry and markets, and less stringent financial reporting and accounting standards and controls.
Health Sciences Portfolio | Health Sciences Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of the Fund’s investments denominated in or with exposure to that foreign currency.
Health Sciences Portfolio | Health Sciences Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Health Sciences Portfolio | Health Sciences Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Health Sciences Portfolio | Health Sciences Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Health Sciences Portfolio | Health Sciences Portfolio | Industry Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Health Sciences Portfolio | Health Sciences Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
Health Sciences Portfolio | Health Sciences Portfolio | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Health Sciences Portfolio | Health Sciences Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Health Sciences Portfolio | Health Sciences Portfolio | Health Sciences Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Health Sciences Sector Risk: Health Sciences companies may be significantly impacted by scientific or technological developments and their products may quickly become obsolete.
​
Many health sciences companies are smaller and less seasoned than companies in other sectors and are heavily dependent on patent protection and the actual or perceived safety and efficiency of their products. Many health sciences companies are subject to extensive litigation based on product liability and similar claims. Also, many health sciences companies offer products and services that are subject to government regulation and so may be adversely affected by changes in governmental policies or laws.
Real Estate Portfolio | Real Estate Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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]  
Risk [Text Block] 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 | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Industry Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Small Number of Holdings Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 | Real Estate Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Technology Portfolio | Technology Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Technology Portfolio | Technology Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Technology Portfolio | Technology Portfolio | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Technology Portfolio | Technology Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Technology Portfolio | Technology Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Technology Portfolio | Technology Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Technology Portfolio | Technology Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Technology Portfolio | Technology Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Technology Portfolio | Technology Portfolio | Emerging Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Emerging Markets Risk: Investments in or exposure to investments in emerging market countries may be riskier than investments in or exposure to investments in U.S. and other developed markets for many reasons, including smaller market
​
capitalizations, greater price volatility, less liquidity, lower credit quality, a higher degree of political and economic instability, the impact of economic sanctions, less governmental regulation and supervision of the financial industry and markets, and less stringent financial reporting and accounting standards and controls.
Technology Portfolio | Technology Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of the Fund’s investments denominated in or with exposure to that foreign currency.
Technology Portfolio | Technology Portfolio | Geographic Focus Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Geographic Focus Risk: If the Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic, political, social, or other conditions in those countries or that region will have a significant impact on the Fund’s performance. As a result, the Fund’s performance may be more volatile than the performance of more geographically diversified funds.
Technology Portfolio | Technology Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Technology Portfolio | Technology Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Technology Portfolio | Technology Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Technology Portfolio | Technology Portfolio | Industry Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Technology Portfolio | Technology Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
Technology Portfolio | Technology Portfolio | Small Number of Holdings Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Technology Portfolio | Technology Portfolio | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Technology Portfolio | Technology Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Technology Portfolio | Technology Portfolio | Technology Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Technology Companies Risk: Technology companies face a number of risks, including operating in rapidly changing fields, abrupt or erratic market movements, limited product lines, markets or financial resources, management that is dependent on a limited number of people, short product cycles, aggressive pricing of products and services, new market entrants and rapid obsolescence of products and services due to technological innovations or changing consumer preferences. By investing in these companies, the Fund is exposed to these risks. In addition, many U.S. companies in the technology sector have diverse operations, with products or services in foreign markets, exposing them to risks associated with foreign markets.
ESG Diversified Portfolio | ESG Diversified Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
ESG Diversified Portfolio | ESG Diversified Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
ESG Diversified Portfolio | ESG Diversified Portfolio | Restricted Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Restricted Securities Risk: Unless registered for sale to the public under applicable federal securities law, restricted securities such as those issued pursuant to Rule 144A can be sold only in private transactions to qualified purchasers pursuant to an exemption from registration. The sale price realized from a private transaction could be less than an ESG Underlying Fund’s purchase price for the restricted security. It may be difficult to identify a qualified purchaser for a restricted security held by an ESG Underlying Fund and such security could be deemed illiquid. It may also be more difficult to value such securities.
ESG Diversified Portfolio | ESG Diversified Portfolio | Mortgage-Related and Other Asset-Backed Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related and other asset-backed securities are subject to certain risks affecting the housing market or the market for the assets underlying such securities. These securities are also subject to extension risk (the risk that rising interest rates extend the duration of fixed mortgage-related and other asset-backed securities, making them more sensitive to changes in interest rates), interest rate risk (the risk that rising interest rates will cause a decline in the value of a fixed income security), subprime risk (the risk that these securities have exposure to borrowers with lower credit risk, increasing potential default), prepayment risk (when interest rates decline, borrowers may pay off their mortgages sooner than expected which can reduce an ESG Underlying Fund’s returns because an ESG Underlying Fund may have to reinvest its assets at lower interest rates), call risk (similar to prepayment risk, an issuer may pay its obligations under a security sooner than expected), U.S. government securities risk (securities backed by different U.S. government agencies are subject to varying levels of credit rating risk), and issuer risk (the risk that a private issuer cannot meet its obligations).
ESG Diversified Portfolio | ESG Diversified Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks
relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
ESG Diversified Portfolio | ESG Diversified Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Securities Lending Risk: If securities for an ESG Underlying Fund are loaned to brokers, dealers or financial institutions, there is a risk that the loaned securities will not be returned or that their return will be delayed, as well as a risk of a loss of rights in the collateral should the borrower or lending agent become insolvent or not meet its contractual obligations. Further, investing the proceeds from the securities loaned subjects the ESG Underlying Fund to leverage risk.
ESG Diversified Portfolio | ESG Diversified Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
ESG Diversified Portfolio | ESG Diversified Portfolio | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Derivatives Risk: The use of forward commitments, futures contracts, options or swap agreements (each a type of derivative instrument) as a principal investment strategy subjects an ESG Underlying Fund to a number of risks, including: counterparty risk, leverage risk, market risk, regulatory risk, liquidity and valuation risk, operational risk, correlation risk, legal risk and premium risk. Derivatives may be riskier than other types of investments and may increase the ESG Underlying Fund’s volatility and risk of loss.
ESG Diversified Portfolio | ESG Diversified Portfolio | Leverage Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Leverage Risk: Certain ESG Underlying Funds may lend their securities. Leverage is investment exposure that exceeds the initial amount invested. The loss on a leveraged investment may far exceed an ESG Underlying Fund’s principal amount invested. Leverage can magnify an ESG Underlying Fund’s gains and losses and therefore increase its volatility.
ESG Diversified Portfolio | ESG Diversified Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce an ESG Underlying Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
ESG Diversified Portfolio | ESG Diversified Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, an ESG Underlying
Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, an ESG Underlying Fund’s yield (and total return) also may be low and an ESG Underlying Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
ESG Diversified Portfolio | ESG Diversified Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide
financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
ESG Diversified Portfolio | ESG Diversified Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 an ESG Underlying Fund’s performance.
ESG Diversified Portfolio | ESG Diversified Portfolio | High Yield/High Risk or “Junk” Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
High Yield/High Risk or “Junk” Securities Risk: High yield/​high risk securities are typically issued by companies that are highly leveraged, less creditworthy or financially distressed and are considered to be mostly speculative in nature (high risk), subject to greater liquidity risk, and subject to a greater risk of default than higher rated securities. High yield/high risk securities may be more volatile than investment grade securities.
ESG Diversified Portfolio | ESG Diversified Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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. An ESG Underlying 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.
ESG Diversified Portfolio | ESG Diversified Portfolio | Emerging Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Emerging Markets Risk: Investments in or exposure to investments in emerging market countries may be riskier than investments in or exposure to investments in U.S. and other developed markets for many reasons, including smaller market capitalizations, greater price volatility, less liquidity, lower credit quality, a higher degree of political and economic instability, the impact of economic sanctions, less governmental regulation and supervision of the financial industry and markets, and less stringent financial reporting and accounting standards and controls.
ESG Diversified Portfolio | ESG Diversified Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of an ESG Underlying Fund’s investments denominated in or with exposure to that foreign currency.
ESG Diversified Portfolio | ESG Diversified Portfolio | Conflicts of Interest Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Conflicts of Interest Risk: PLFA is subject to competing interests that have the potential to influence its investment decisions for the Fund. For example, PLFA’s management of the Fund and the Fund’s risk/return profile may be influenced by the insurance companies that use the Fund as an investment option for their variable life and annuity contracts. These insurance companies may include affiliates of PLFA. For instance, PLFA’s management of the Fund may be influenced by the insurance companies’ financial interest in reducing the volatility of the overall value of variable life and annuity contracts in light of the insurance companies’ obligations on various guarantees under those contracts, which may potentially conflict with the interests of contract owners who are invested in the Fund by limiting the Fund’s returns. PLFA seeks to identify and address any potential conflicts in a manner that is fair for the Fund and its shareholders. PLFA has adopted a policy under which investment decisions for the Fund must be made in the best interests of the Fund and its shareholders.
ESG Diversified Portfolio | ESG Diversified Portfolio | Geographic Focus Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Geographic Focus Risk: If an ESG Underlying Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic, political, social, or other conditions in those countries or that region will have a significant impact on the ESG Underlying Fund’s performance. As a result, the ESG Underlying Fund’s performance may be more volatile than the performance of more geographically diversified funds.
ESG Diversified Portfolio | ESG Diversified Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
ESG Diversified Portfolio | ESG Diversified Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
ESG Diversified Portfolio | ESG Diversified Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
ESG Diversified Portfolio | ESG Diversified Portfolio | Tracking Error Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Tracking Error Risk: Performance of a passively managed ESG Underlying 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.
ESG Diversified Portfolio | ESG Diversified Portfolio | Passive Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
ESG Diversified Portfolio | ESG Diversified Portfolio | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
ESG Diversified Portfolio | ESG Diversified Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
ESG Diversified Portfolio | ESG Diversified Portfolio | Index Sampling Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Index Sampling Risk: Because index sampling relies on the securities selected to have economic characteristics similar to securities in a passively managed ESG Underlying Fund’s benchmark index, as opposed to holding the constituent securities of that index in the same proportion as the index holds them, index sampling may not result in the aggregate in investment performance matching that of a passively managed ESG Underlying Fund’s benchmark 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.
ESG Diversified Portfolio | ESG Diversified Portfolio | Asset Allocation Fund Of Funds Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Asset Allocation Fund of Funds Risk: Asset allocation decisions, techniques, analyses, or models implemented by PLFA as the Fund’s investment adviser may not produce the expected returns, may cause the Fund’s shares to lose value or may cause the Fund to underperform other funds with similar investment goals. Although the theory behind asset allocation is that diversification among asset classes can help reduce volatility over the long term, PLFA’s assumptions about asset classes and ESG Underlying Funds may diverge from historical performance and assumptions used to develop allocations in light of actual market conditions. There is a risk that you could achieve better returns by investing in an individual fund or funds representing a single broad asset class rather than investing in a fund of funds. The Fund’s performance is also closely related to the ESG Underlying Funds performance and ability to meet their investment goals. Fund shareholders bear indirectly the expenses of the ESG Underlying Funds in which the Fund invests in addition to the Fund’s management fee so there is a risk of an additional layer or layers of fees. The Fund’s actual asset class allocations may deviate from the intended allocation because an ESG Underlying Fund’s investments can change due to market movements, the ESG Underlying Fund Manager’s investment decisions or other factors, which could result in the fund’s risk/return target not being met. As a fund of funds, the Fund is exposed to the same risks as the ESG Underlying Funds in proportion to the Fund’s allocation to those ESG Underlying Funds.
ESG Diversified Portfolio | ESG Diversified Portfolio | ESGCriteria Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
ESG Criteria Risk: Consideration of ESG criteria in its investment process could cause the Fund to forgo investment opportunities available to funds not using these criteria and underperform such funds. Further, there can be no assurance
that the ESG criteria utilized by PLFA for the Fund or any judgment PLFA exercises regarding ESG criteria for the Fund will reflect the beliefs or values of any particular investor. An independent third party data provider’s assessment of the financial materiality of ESG factors could be inaccurate, which may have an adverse impact on the Fund’s performance or cause the Fund to hold an ESG Underlying Fund that might be ranked low from an environmental, social or governance perspective, or its methodology could be based on a methodology or perspective different from another provider’s. In addition, developments in the United States at the federal and state levels have caused considerable pressure to be placed on ESG initiatives, resulting in a sensitive political and regulatory environment for asset managers and funds that offer ESG strategies. Accordingly, regulations and industry practices related to ESG are changing rapidly, and PLFA’s practices and the Fund’s investment strategies may change if required to comply with such regulations or adopt such practices.
ESG Diversified Portfolio | ESG Diversified Portfolio | Underlying Funds ESG Criteria Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
ESG Criteria Risk: Consideration of ESG Criteria in its investment process could cause an ESG Underlying Fund to forgo investment opportunities available to funds not using these criteria and underperform such funds. An ESG Underlying Fund manager’s determination of what constitutes ESG Criteria and its process to evaluate the ESG Criteria may differ from other investment advisers. Further, there can be no assurance that the ESG Criteria utilized by the manager or any judgment exercised by the manager will reflect the beliefs or values of any particular investor. An independent third party ESG data provider’s assessment of the financial materiality of ESG factors could be inaccurate, and the provider could delay ESG data delivery and evaluation (e.g., changing geo-political risks that may impact involvement in one or more excluded activity), which may have an adverse impact on the ESG Underlying Fund’s performance or cause the ESG Underlying Fund to hold a security that might be ranked low from an environmental, social or governance perspective, or its methodology could be based on a methodology or perspective different from another provider’s. In addition, developments in the United States at the federal and state levels have caused considerable pressure to be placed on ESG initiatives, resulting in a sensitive political and regulatory environment for asset managers and funds that offer ESG strategies. Accordingly, regulations and industry practices related to ESG are changing rapidly, and an ESG Underlying Fund manager’s practices and the ESG Underlying Fund’s investment strategies may change if required to comply with such regulations or adopt such practices.
ESG Diversified Portfolio | ESG Diversified Portfolio | Municipal Obligations Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Municipal Obligations Risk: The amount of public information available about municipal obligations is generally less than for corporate equities or bonds, meaning that the investment performance of municipal obligations may be more dependent on the analytical abilities of the investment adviser than stock or corporate bond investments. The secondary market for municipal obligations also tends to be less well-developed and less liquid than many other securities markets, which may limit the ESG Underlying Fund’s ability to sell its municipal obligations at attractive prices. The differences between the price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress. Less liquid obligations can become more difficult to value and be subject to erratic price movements. The increased presence of non-traditional participants (such as proprietary trading desks of investment banks and hedge funds) or the absence of traditional participants (such as individuals, insurance companies, banks and life insurance companies) in the municipal markets may lead to greater volatility in the markets because non-traditional participants may trade more frequently or in greater volume.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Restricted Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Restricted Securities Risk: Unless registered for sale to the public under applicable federal securities law, restricted securities such as those issued pursuant to Rule 144A can be sold only in private transactions to qualified purchasers pursuant to an exemption from registration. The sale price realized from a private transaction could be less than an ESG Underlying Fund’s purchase price for the restricted security. It may be difficult to identify a qualified purchaser for a restricted security held by an ESG Underlying Fund and such security could be deemed illiquid. It may also be more difficult to value such securities.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Mortgage-Related and Other Asset-Backed Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related and other asset-backed securities are subject to certain risks affecting the housing market or the market for the assets underlying such securities. These securities are also subject to extension risk (the risk that rising interest rates extend the duration of fixed mortgage-related and other asset-backed securities, making them more sensitive to changes in interest rates), interest rate risk (the risk that rising interest rates will cause a decline in the value of a fixed income security), subprime risk (the risk that these securities have exposure to borrowers with lower credit risk, increasing potential default), prepayment risk (when interest rates decline, borrowers may pay off their mortgages sooner than expected which can reduce an ESG Underlying Fund’s returns because an ESG Underlying Fund may have to reinvest its assets at lower interest rates), call risk (similar to prepayment risk, an issuer may pay its obligations under a security sooner than expected), U.S. government securities risk (securities backed by different U.S. government agencies are subject to varying levels of credit rating risk), and issuer risk (the risk that a private issuer cannot meet its obligations).
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Securities Lending Risk: If securities for an ESG Underlying Fund are loaned to brokers, dealers or financial institutions, there is a risk that the loaned securities will not be returned or that their return will be delayed, as well as a risk of a loss of rights in the collateral should the borrower or lending agent become insolvent or not meet its contractual obligations. Further, investing the proceeds from the securities loaned subjects the ESG Underlying Fund to leverage risk.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Derivatives Risk: The use of forward commitments, futures contracts, options or swap agreements (each a type of derivative instrument) as a principal investment strategy subjects an ESG Underlying Fund to a number of risks, including: counterparty risk, leverage risk, market risk, regulatory risk, liquidity and valuation risk, operational risk, correlation risk, legal risk and premium risk. Derivatives may be riskier than other types of investments and may increase the ESG Underlying Fund’s volatility and risk of loss.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Leverage Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Leverage Risk: Certain ESG Underlying Funds may lend their securities. Leverage is investment exposure that exceeds the initial amount invested. The loss on a leveraged investment may far exceed an ESG Underlying Fund’s principal amount invested. Leverage can magnify an ESG Underlying Fund’s gains and losses and therefore increase its volatility.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce an ESG Underlying Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, an ESG Underlying Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, an ESG Underlying Fund’s yield (and total return) also may be low and an ESG Underlying Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 an ESG Underlying Fund’s performance.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | High Yield/High Risk or “Junk” Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
High Yield/High Risk or “Junk” Securities Risk: High yield/​high risk securities are typically issued by companies that are highly leveraged, less creditworthy or financially distressed and are considered to be mostly speculative in nature (high risk), subject to greater liquidity risk, and subject to a greater risk of default than higher rated securities. High yield/high risk securities may be more volatile than investment grade securities.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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. An ESG Underlying 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.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Emerging Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Emerging Markets Risk: Investments in or exposure to investments in emerging market countries may be riskier than investments in or exposure to investments in U.S. and other developed markets for many reasons, including smaller market capitalizations, greater price volatility, less liquidity, lower credit quality, a higher degree of political and economic instability, the impact of economic sanctions, less governmental regulation and supervision of the financial industry and markets, and less stringent financial reporting and accounting standards and controls.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of an ESG Underlying Fund’s investments denominated in or with exposure to that foreign currency.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Conflicts of Interest Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Conflicts of Interest Risk: PLFA is subject to competing interests that have the potential to influence its investment decisions for the Fund. For example, PLFA’s management of the Fund and the Fund’s risk/return profile may be influenced by the insurance companies that use the Fund as an investment option for their variable life and annuity contracts. These insurance companies may include affiliates of PLFA. For instance, PLFA’s management of the Fund may be influenced by the insurance companies’ financial interest in reducing the volatility of the overall value of variable life and annuity contracts in light of the insurance companies’ obligations on various guarantees under those contracts, which may potentially conflict with the interests of contract owners who are invested in the Fund by limiting the Fund’s returns. PLFA seeks to identify and address any potential conflicts in a manner that is fair for the Fund and its shareholders. PLFA has adopted a policy under which investment decisions for the Fund must be made in the best interests of the Fund and its shareholders.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Geographic Focus Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Geographic Focus Risk: If an ESG Underlying Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic, political, social, or other conditions in those countries or that region will have a significant impact on the ESG Underlying Fund’s performance. As a result, the ESG Underlying Fund’s performance may be more volatile than the performance of more geographically diversified funds.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Tracking Error Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Tracking Error Risk: Performance of a passively managed ESG Underlying 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.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Passive Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Index Sampling Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Index Sampling Risk: Because index sampling relies on the securities selected to have economic characteristics similar to securities in a passively managed ESG Underlying Fund’s
benchmark index, it may not result in the aggregate in investment performance matching that of a passively managed ESG Underlying Fund’s benchmark 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.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Asset Allocation Fund Of Funds Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Asset Allocation Fund of Funds Risk: Asset allocation decisions, techniques, analyses, or models implemented by PLFA as the Fund’s investment adviser may not produce the expected returns, may cause the Fund’s shares to lose value or may cause the Fund to underperform other funds with similar investment goals. Although the theory behind asset allocation is that diversification among asset classes can help reduce volatility over the long term, PLFA’s assumptions about asset classes and ESG Underlying Funds may diverge from historical performance and assumptions used to develop allocations in light of actual market conditions. There is a risk that you could achieve better returns by investing in an individual fund or funds representing a single broad asset class rather than investing in a fund of funds. The Fund’s performance is also closely related to the ESG Underlying Funds performance and ability to meet their investment goals. Fund shareholders bear indirectly the expenses of the ESG Underlying Funds in which the Fund invests in addition to the Fund’s management fee so there is a risk of an additional layer or layers of fees. The Fund’s actual asset class allocations may deviate from the intended allocation because an ESG Underlying Fund’s investments can change due to market movements, the ESG Underlying Fund Manager’s investment decisions or other factors, which could result in the fund’s risk/return target not being met. As a fund of funds, the Fund is exposed to the same risks as the ESG Underlying Funds in proportion to the Fund’s allocation to those ESG Underlying Funds.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | ESGCriteria Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
ESG Criteria Risk: Consideration of ESG criteria in its investment process could cause the Fund to forgo investment opportunities available to funds not using these criteria and underperform such funds. Further, there can be no assurance
that the ESG criteria utilized by PLFA for the Fund or any judgment PLFA exercises regarding ESG criteria for the Fund will reflect the beliefs or values of any particular investor. An independent third party data provider’s assessment of the financial materiality of ESG factors could be inaccurate, which may have an adverse impact on the Fund’s performance or cause the Fund to hold an ESG Underlying Fund that might be ranked low from an environmental, social or governance perspective, or its methodology could be based on a methodology or perspective different from another provider’s. In addition, developments in the United States at the federal and state levels have caused considerable pressure to be placed on ESG initiatives, resulting in a sensitive political and regulatory environment for asset managers and funds that offer ESG strategies. Accordingly, regulations and industry practices related to ESG are changing rapidly, and PLFA’s practices and the Fund’s investment strategies may change if required to comply with such regulations or adopt such practices.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Underlying Funds ESG Criteria Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
ESG Criteria Risk: Consideration of ESG Criteria in its investment process could cause an ESG Underlying Fund to forgo investment opportunities available to funds not using these criteria and underperform such funds. An ESG Underlying Fund manager’s determination of what constitutes ESG Criteria and its process to evaluate the ESG Criteria may differ from other investment advisers. Further, there can be no assurance that the ESG Criteria utilized by the manager or any judgment exercised by the manager will reflect the beliefs or values of any particular investor. An independent third party ESG data provider’s assessment of the financial materiality of ESG factors could be inaccurate, and the provider could delay ESG data delivery and evaluation (e.g., changing geo-political risks that may impact involvement in one or more excluded activity), which may have an adverse impact on the ESG Underlying Fund’s performance or cause the ESG Underlying Fund to hold a security that might be ranked low from an environmental, social or governance perspective, or its methodology could be based on a methodology or perspective different from another provider’s. In addition, developments in the United States at the federal and state levels have caused considerable pressure to be placed on ESG initiatives, resulting in a sensitive political and regulatory environment for asset managers and funds that offer ESG strategies. Accordingly, regulations and industry practices related to ESG are changing rapidly, and an ESG Underlying Fund manager’s practices and the ESG Underlying Fund’s investment strategies may change if required to comply with such regulations or adopt such practices.
ESG Diversified Growth Portfolio | ESG Diversified Growth Portfolio | Municipal Obligations Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Municipal Obligations Risk: The amount of public information available about municipal obligations is generally less than for corporate equities or bonds, meaning that the investment performance of municipal obligations may be more dependent on the analytical abilities of the investment adviser than stock or corporate bond investments. The secondary market for municipal obligations also tends to be less well-developed and less liquid than many other securities markets, which may limit the ESG Underlying Fund’s ability to sell its municipal obligations at attractive prices. The differences between the price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress. Less liquid obligations can become more difficult to value and be subject to erratic price movements. The increased presence of non-traditional participants (such as proprietary trading desks of investment banks and hedge funds) or the absence of traditional participants (such as individuals, insurance companies, banks and life insurance companies) in the municipal markets may lead to greater volatility in the markets because non-traditional participants may trade more frequently or in greater volume.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | ETF Market Trading Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
ETF Market Trading Risk: An ETF faces numerous market trading risks, including the potential lack of an active market for ETF shares, losses from trading in secondary markets, periods of high volatility and disruption in the creation and/or redemption process of the ETF. Any of these factors, among others, may lead to the ETF’s shares trading above NAV (at a premium) or below NAV (at a discount). Thus, an investor such as the PSF Avantis Balanced Allocation Portfolio may pay more (or less) than NAV when buying shares of the ETF in the secondary market, and may receive less (or more) than NAV when selling those shares in the secondary market. The portfolio managers cannot predict whether shares will trade at a premium or discount or at NAV.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the
world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Derivatives Risk: The use of forward commitments, futures contracts, options or swaps (each a type of derivative instrument) as a principal investment strategy subjects a Balanced Allocation Underlying Fund to a number of risks, including: counterparty risk, leverage risk, market risk, regulatory risk, liquidity and valuation risk, operational risk, correlation risk, legal risk and premium risk. Derivatives may be riskier than other types of investments and may increase the Balanced Allocation Underlying Fund’s volatility and risk of loss.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Leverage Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Leverage Risk: A Balanced Allocation Underlying Fund may lend its securities or use derivatives instruments, which give rise to a form of leverage. Leverage is investment exposure that exceeds the initial amount invested. The loss on a leveraged investment may far exceed a Balanced Allocation Underlying Fund’s principal amount invested. Leverage can magnify a Balanced Allocation Underlying Fund’s gains and losses and therefore increase its volatility.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce a Balanced Allocation Underlying Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, the Balanced Allocation Underlying Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, the Balanced Allocation Underlying Fund’s yield (and total return) also may be low and the Balanced Allocation Underlying Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 a Balanced Allocation Underlying Fund’s performance.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | High Yield/High Risk or “Junk” Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
High Yield/High Risk or “Junk” Securities Risk: High yield/​high risk securities are typically issued by companies that are highly leveraged, less creditworthy or financially distressed and are considered to be mostly speculative in nature (high risk), subject to greater liquidity risk, and subject to a greater risk of default than higher rated securities. High yield/high risk securities (including loans) may be more volatile than investment grade securities.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Floating Rate Loan Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Floating Rate Loan Risk: Floating rate loans (or bank loans) are usually rated below investment grade and thus are subject to high yield/high risk or “junk” securities risk. The market for floating rate loans is a private interbank resale market and thus may be subject to irregular trading activity, wide bid/ask spreads and delayed settlement periods. Purchases and sales of loans are generally subject to contractual restrictions that must be fulfilled before a loan can be bought or sold. These restrictions may hamper a Balanced Allocation Underlying Fund’s ability to buy or sell loans and negatively affect the transaction price. A significant portion of the floating rate loans held by a Balanced Allocation Underlying Fund may be “covenant lite” loans that contain fewer or less restrictive constraints on the borrower or other borrower-friendly characteristics and offer less protections for investors than covenant loans. It may take longer than seven days for transactions in loans to settle. This may result in cash proceeds not being immediately available to a Balanced Allocation Underlying Fund, requiring a Balanced Allocation Underlying Fund to borrow cash which would increase a Balanced Allocation Underlying Fund’s expenses. The Balanced Allocation Underlying Fund is also subject to credit risk with respect to the issuer of the loan. Investments in junior loans involve a higher degree of overall risk.
​
U.S. federal securities laws afford certain protections against fraud and misrepresentation in connection with the offering or sale of a security, as well as against manipulation of trading markets for securities. However, it is unclear whether these protections are available to an investment in a loan.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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. A Balanced Allocation Underlying 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.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of a Balanced Allocation Underlying Fund’s investments denominated in or with exposure to that foreign currency.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Conflicts of Interest Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Conflicts of Interest Risk: PLFA is subject to competing interests that have the potential to influence its investment decisions for the Fund. For example, PLFA’s management of the Fund and the Fund’s risk/return profile may be influenced by the insurance companies that use the Fund as an investment option for their variable life and annuity contracts. These insurance companies may include affiliates of PLFA. For instance, PLFA’s management of the Fund may be influenced by the insurance companies’ financial interest in reducing the volatility of the overall value of variable life and annuity contracts in light of the insurance companies’ obligations on various guarantees under those contracts, which may potentially conflict with the interests of contract owners who are invested in the Fund by limiting the Fund’s returns. PLFA seeks to identify and address any potential conflicts in a manner that is fair for the Fund and its shareholders. PLFA has adopted a policy under which investment decisions for the Fund must be made in the best interests of the Fund and its shareholders.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Geographic Focus Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Geographic Focus Risk: If a Balanced Allocation Underlying Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic, political, social, or other conditions in those countries or that region will have a significant impact on the Balanced Allocation Underlying Fund’s performance. As a result, the Balanced Allocation Underlying Fund’s performance may be more volatile than the performance of more geographically diversified funds.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Passive Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Asset Allocation Fund Of Funds Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Asset Allocation Fund of Funds Risk: Asset allocation decisions, techniques, analyses, or models implemented by PLFA as the Fund’s investment adviser may not produce the expected returns, may cause the Fund’s shares to lose value or may cause the Fund to underperform other funds with similar investment goals. Although the theory behind asset allocation is that diversification among asset classes can help reduce volatility over the long term, PLFA’s assumptions about asset classes and Balanced Allocation Underlying Funds may diverge from historical performance and assumptions used to develop allocations in light of actual market conditions. There is a risk that you could achieve better returns by investing in an individual fund or funds representing a single broad asset class rather than investing in a fund of funds. The Fund’s performance is also closely related to the Balanced Allocation Underlying Funds performance and ability to meet their investment goals. Fund shareholders bear indirectly the expenses of the Balanced Allocation Underlying Funds in which the Fund invests in addition to the Fund’s management fee so there is a risk of an additional layer or layers of fees. The Fund’s actual asset class allocations may deviate from the intended allocation because a Balanced Allocation Underlying Fund’s investments can change due to market movements, the Balanced Allocation Underlying Fund Manager’s investment decisions or other factors, which could result in the fund’s risk/return target not being met. As a fund of funds, the Fund is exposed to the same risks as the Balanced Allocation Underlying Funds in proportion to the Fund’s allocation to those Balanced Allocation Underlying Funds.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Authorized Participant Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Authorized Participant Concentration Risk: Only an authorized participant may engage in creation or redemption transactions directly with an ETF. The ETF may have a limited number of institutions that act as authorized participants. To the extent that these institutions exit the business or are unable to proceed with creation and/or redemption orders with respect to the ETF and no other authorized participant is able to step forward to process creation and/or redemption orders, ETF shares may trade at a discount to net asset value (“NAV”) and possibly face trading halts and/or delisting. This risk may be more pronounced in volatile markets, potentially where there are significant redemptions in ETFs generally.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Cash Transactions Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Cash Transactions Risk: An ETF may effect its creations and redemptions for cash, rather than for in-kind securities. In order to effect redemptions in cash, such ETF may be required to sell portfolio securities and subsequently recognize gains on such sales that the ETF might not have recognized if it were to distribute portfolio securities in-kind. Therefore, an investment in such ETF may be less tax-efficient than an investment in an ETF that effects redemptions entirely in-kind. Cash transactions may have to be carried out over several days if the securities market is relatively illiquid and may involve considerable brokerage fees and taxes. Brokerage fees and taxes will be higher than if the ETF sold and redeemed shares in-kind.
PSF Avantis Balanced Allocation Portfolio | PSF Avantis Balanced Allocation Portfolio | Underlying Funds Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Securities Lending Risk: If securities for a Balanced Allocation Underlying Fund are loaned to brokers, dealers or financial institutions, there is a risk that the loaned securities will not be returned or that their return will be delayed, as well as a risk of a loss of rights in the collateral should the borrower or lending agent become insolvent or not meet its contractual obligations. Further, investing the proceeds from the securities loaned subjects the Fund to leverage risk.
Pacific Dynamix - Conservative Growth Portfolio | Pacific Dynamix - Conservative Growth Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Pacific Dynamix - Conservative Growth Portfolio | Pacific Dynamix - Conservative Growth Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Pacific Dynamix - Conservative Growth Portfolio | Pacific Dynamix - Conservative Growth Portfolio | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Non-Diversification Risk: In order to track the composition of the index for which it seeks corresponding investment results, a Pacific Dynamix Underlying 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, a Pacific Dynamix Underlying Fund may become non-diversified under the 1940 Act. This increases the risk that the Pacific Dynamix Underlying 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 Pacific Dynamix Underlying Fund than a diversified fund with more investments.
Pacific Dynamix - Conservative Growth Portfolio | Pacific Dynamix - Conservative Growth Portfolio | Mortgage-Related and Other Asset-Backed Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related and other asset-backed securities are subject to certain risks affecting the housing market or the
market for the assets underlying such securities. These securities are also subject to extension risk (the risk that rising interest rates extend the duration of fixed mortgage-related and other asset-backed securities, making them more sensitive to changes in interest rates), interest rate risk (the risk that rising interest rates will cause a decline in the value of a fixed income security), subprime risk (the risk that these securities have exposure to borrowers with lower credit risk, increasing potential default), prepayment risk (when interest rates decline, borrowers may pay off their mortgages sooner than expected which can reduce a Pacific Dynamix Underlying Fund’s returns because a Pacific Dynamix Underlying Fund may have to reinvest its assets at lower interest rates), call risk (similar to prepayment risk, an issuer may pay its obligations under a security sooner than expected), U.S. government securities risk (securities backed by different U.S. government agencies are subject to varying levels of credit rating risk) and issuer risk (the risk that a private issuer cannot meet its obligations).
Pacific Dynamix - Conservative Growth Portfolio | Pacific Dynamix - Conservative Growth Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Pacific Dynamix - Conservative Growth Portfolio | Pacific Dynamix - Conservative Growth Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Securities Lending Risk: A Pacific Dynamix Underlying Fund may engage in securities lending, which involves the risk that a Pacific Dynamix Underlying Fund may suffer a loss if the borrower fails to return the loaned securities in a timely manner or at all. A Pacific Dynamix Underlying 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.
Pacific Dynamix - Conservative Growth Portfolio | Pacific Dynamix - Conservative Growth Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
Pacific Dynamix - Conservative Growth Portfolio | Pacific Dynamix - Conservative Growth Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce a Pacific Dynamix Underlying Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
Pacific Dynamix - Conservative Growth Portfolio | Pacific Dynamix - Conservative Growth Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, the Pacific Dynamix Underlying Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, the Pacific Dynamix Underlying Fund’s yield (and total return) also may be low and the Pacific Dynamix Underlying Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
Pacific Dynamix - Conservative Growth Portfolio | Pacific Dynamix - Conservative Growth Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
Pacific Dynamix - Conservative Growth Portfolio | Pacific Dynamix - Conservative Growth Portfolio | Financial Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Pacific Dynamix - Conservative Growth Portfolio | Pacific Dynamix - Conservative Growth Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Underlying Fund Risk: Because a Pacific Dynamix Underlying 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 Pacific Dynamix Underlying Fund, causing the sale of securities in a short timeframe and potential increases in expenses to the Pacific Dynamix Underlying Fund and its remaining shareholders, both of which could negatively impact performance.
Pacific Dynamix - Conservative Growth Portfolio | Pacific Dynamix - Conservative Growth Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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. A Pacific Dynamix Underlying 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.
Pacific Dynamix - Conservative Growth Portfolio | Pacific Dynamix - Conservative Growth Portfolio | Conflicts of Interest Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Conflicts of Interest Risk: PLFA is subject to competing interests that have the potential to influence its investment decisions for the Fund. For example, a Pacific Dynamix Underlying Fund that provides greater profitability to PLFA than another Pacific Dynamix Underlying Fund may create an incentive for PLFA to use that fund as a Pacific Dynamix Underlying Fund. In addition, PLFA may be influenced by its view of the best interests of Pacific Dynamix Underlying
Funds, such as a view that a Pacific Dynamix Underlying Fund may benefit from additional assets or could be harmed by redemptions. In addition, PLFA’s management of the Fund and the Fund’s risk/return profile may be influenced by the insurance companies that use the Fund as an investment option for their variable life and annuity contracts. These insurance companies may include affiliates of PLFA. PLFA seeks to identify and address any potential conflicts in a manner that is fair for Pacific Dynamix Underlying Funds, the Fund and the shareholders of the Fund. PLFA has adopted a policy under which investment decisions for the Fund must be made in the best interests of the Fund and its shareholders, and PLFA may take into account the interests of a Pacific Dynamix Underlying Fund and its shareholders when making investment decisions for the Fund.
Pacific Dynamix - Conservative Growth Portfolio | Pacific Dynamix - Conservative Growth Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Pacific Dynamix - Conservative Growth Portfolio | Pacific Dynamix - Conservative Growth Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Pacific Dynamix - Conservative Growth Portfolio | Pacific Dynamix - Conservative Growth Portfolio | Tracking Error Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Tracking Error Risk: Performance of a Pacific Dynamix Underlying Fund may vary from the performance of the index for which it seeks corresponding investment results due to imperfect correlation between the Pacific Dynamix Underlying Fund’s investments and that index.
Pacific Dynamix - Conservative Growth Portfolio | Pacific Dynamix - Conservative Growth Portfolio | Industry Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Industry Concentration Risk: Concentrating investments in a particular industry or group of industries makes a Pacific Dynamix Underlying Fund more susceptible to adverse economic, business, regulatory or other developments affecting that industry or group of industries, which could negatively impact performance.
Pacific Dynamix - Conservative Growth Portfolio | Pacific Dynamix - Conservative Growth Portfolio | Passive Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Pacific Dynamix - Conservative Growth Portfolio | Pacific Dynamix - Conservative Growth Portfolio | Technology Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Technology Sector Risk: Companies in the Technology sector face a number of risks, including operating in rapidly changing fields, abrupt or erratic market movements, limited product lines, markets or financial resources, management that is dependent on a limited number of people, short product cycles, aggressive pricing of products and services, new market entrants and rapid obsolescence of products and services due to technological innovations or changing consumer preferences. In addition, many U.S. companies in the Technology sector have diverse operations, with products or services in foreign markets, exposing them to risks associated with foreign markets.
Pacific Dynamix - Conservative Growth Portfolio | Pacific Dynamix - Conservative Growth Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
Pacific Dynamix - Conservative Growth Portfolio | Pacific Dynamix - Conservative Growth Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Pacific Dynamix - Conservative Growth Portfolio | Pacific Dynamix - Conservative Growth Portfolio | Index Sampling Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 a Pacific Dynamix Underlying Fund seeks corresponding investment results, as opposed to holding the constituent securities of that index in the same proportion as the index 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.
Pacific Dynamix - Conservative Growth Portfolio | Pacific Dynamix - Conservative Growth Portfolio | Asset Allocation Fund Of Funds Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Asset Allocation Fund of Funds Risk: Asset allocation decisions, techniques, analyses, or models implemented by PLFA as the Fund’s investment adviser may not produce the expected returns, may cause the Fund’s shares to lose value or may cause the Fund to underperform other funds with similar investment goals. Although the theory behind asset allocation is that diversification among asset classes can help reduce volatility over the long term, PLFA’s assumptions about asset classes and Pacific Dynamix Underlying Funds may diverge from historical performance and assumptions used to develop allocations in light of actual market conditions. There is a risk that you could achieve better returns by investing in an individual fund or funds representing a single broad asset class rather than investing in a fund of funds. The Fund’s performance is also closely related to the Pacific Dynamix Underlying Funds performance and ability to meet their investment goals. Fund shareholders bear indirectly the expenses of the Pacific Dynamix Underlying Funds in which the Fund invests in addition to the Fund’s management fee so there is a risk of an additional layer or layers of fees. The Fund’s actual asset class allocations may deviate from the intended allocation because a Pacific Dynamix Underlying Fund’s investments can change due to market movements, the Pacific Dynamix Underlying Fund Manager’s investment decisions or other factors, which could result in the fund’s risk/​return target not being met. As a fund of funds, the Fund is exposed to the same risks as the Pacific Dynamix Underlying Funds in proportion to the Fund’s allocation to those Pacific Dynamix Underlying Funds.
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Non-Diversification Risk: In order to track the composition of the index for which it seeks corresponding investment results, a Pacific Dynamix Underlying 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, a Pacific Dynamix Underlying Fund may become non-diversified under the 1940 Act. This increases the risk that the Pacific Dynamix Underlying 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 Pacific Dynamix Underlying Fund than a diversified fund with more investments.
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | Mortgage-Related and Other Asset-Backed Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related and other asset-backed securities are subject to certain risks affecting the housing market or the market for the assets underlying such securities. These securities are also subject to extension risk (the risk that rising interest rates extend the duration of fixed mortgage-related and other asset-backed securities, making them more sensitive to changes in interest rates), interest rate risk (the risk that rising interest rates will cause a decline in the value of a fixed income security), subprime risk (the risk that these securities have exposure to borrowers with lower credit risk, increasing potential default), prepayment risk (when interest rates decline, borrowers may pay off their mortgages sooner than expected which can reduce a Pacific Dynamix Underlying Fund’s returns because a Pacific Dynamix Underlying Fund may have to reinvest its assets at lower interest rates), call risk (similar to prepayment risk, an issuer may pay its obligations under a security sooner than expected), U.S. government securities risk (securities backed by different U.S. government agencies are subject to varying levels of credit rating risk) and issuer risk (the risk that a private issuer cannot meet its obligations).
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Securities Lending Risk: A Pacific Dynamix Underlying Fund may engage in securities lending, which involves the risk that a Pacific Dynamix Underlying Fund may suffer a loss if the borrower fails to return the loaned securities in a timely manner or at all. A Pacific Dynamix Underlying 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.
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce a Pacific Dynamix Underlying Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, the Pacific Dynamix Underlying Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, the Pacific Dynamix Underlying Fund’s yield (and total return) also may be low and the Pacific Dynamix Underlying Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide
financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Underlying Fund Risk: Because a Pacific Dynamix Underlying 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 Pacific Dynamix Underlying Fund, causing the sale of securities in a short timeframe and potential increases in expenses to the Pacific Dynamix Underlying Fund and its remaining shareholders, both of which could negatively impact performance.
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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. A Pacific Dynamix Underlying 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.
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of a Pacific Dynamix Underlying Fund’s investments denominated in or with exposure to that foreign currency.
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | Conflicts of Interest Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Conflicts of Interest Risk: PLFA is subject to competing interests that have the potential to influence its investment decisions for the Fund. For example, a Pacific Dynamix Underlying Fund that provides greater profitability to PLFA than another Pacific Dynamix Underlying Fund may create an incentive for PLFA to use that fund as a Pacific Dynamix Underlying Fund. In addition, PLFA may be influenced by its view of the best interests of Pacific Dynamix Underlying
Funds, such as a view that a Pacific Dynamix Underlying Fund may benefit from additional assets or could be harmed by redemptions. In addition, PLFA’s management of the Fund and the Fund’s risk/return profile may be influenced by the insurance companies that use the Fund as an investment option for their variable life and annuity contracts. These insurance companies may include affiliates of PLFA. PLFA seeks to identify and address any potential conflicts in a manner that is fair for Pacific Dynamix Underlying Funds, the Fund and the shareholders of the Fund. PLFA has adopted a policy under which investment decisions for the Fund must be made in the best interests of the Fund and its shareholders, and PLFA may take into account the interests of a Pacific Dynamix Underlying Fund and its shareholders when making investment decisions for the Fund.
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | Geographic Focus Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Geographic Focus Risk: If a Pacific Dynamix Underlying Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic, political, social, or other conditions in those countries or that region will have a significant impact on the Pacific Dynamix Underlying Fund’s performance. As a result, the Pacific Dynamix Underlying Fund’s performance may be more volatile than the performance of more geographically diversified funds.
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | Tracking Error Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Tracking Error Risk: Performance of a Pacific Dynamix Underlying Fund may vary from the performance of the index for which it seeks corresponding investment results due to imperfect correlation between the Pacific Dynamix Underlying Fund’s investments and that index.
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | Industry Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Industry Concentration Risk: Concentrating investments in a particular industry or group of industries makes a Pacific Dynamix Underlying Fund more susceptible to adverse economic, business, regulatory or other developments affecting that industry or group of industries, which could negatively impact performance.
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | Passive Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | Technology Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Technology Sector Risk: Companies in the Technology sector face a number of risks, including operating in rapidly changing fields, abrupt or erratic market movements, limited product lines, markets or financial resources,
management that is dependent on a limited number of people, short product cycles, aggressive pricing of products and services, new market entrants and rapid obsolescence of products and services due to technological innovations or changing consumer preferences. In addition, many U.S. companies in the Technology sector have diverse operations, with products or services in foreign markets, exposing them to risks associated with foreign markets.
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | Index Sampling Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 a Pacific Dynamix Underlying Fund seeks corresponding investment results, as opposed to holding the constituent securities of that index in the same proportion as the index 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.
Pacific Dynamix - Moderate Growth Portfolio | Pacific Dynamix - Moderate Growth Portfolio | Asset Allocation Fund Of Funds Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Asset Allocation Fund of Funds Risk: Asset allocation decisions, techniques, analyses, or models implemented by PLFA as the Fund’s investment adviser may not produce the expected returns, may cause the Fund’s shares to lose value or may cause the Fund to underperform other funds with similar investment goals. Although the theory behind asset allocation is that diversification among asset classes can help reduce volatility over the long term, PLFA’s assumptions about asset classes and Pacific Dynamix Underlying Funds may diverge from historical performance and assumptions used to develop allocations in light of actual market conditions. There is a risk that you could achieve better returns by investing in an individual fund or funds representing a single broad asset class rather than investing in a fund of funds. The Fund’s performance is also closely related to the Pacific Dynamix Underlying Funds performance and ability to meet their investment goals. Fund shareholders bear indirectly the expenses of the Pacific Dynamix Underlying Funds in which the Fund invests in addition to the Fund’s management fee so there is a risk of an additional layer or layers of fees. The Fund’s actual asset class allocations may deviate from the intended allocation because a Pacific Dynamix Underlying Fund’s investments can change due to market movements, the Pacific Dynamix Underlying Fund Manager’s investment decisions or other factors, which could result in the fund’s risk/​return target not being met. As a fund of funds, the Fund is exposed to the same risks as the Pacific Dynamix Underlying Funds in proportion to the Fund’s allocation to those Pacific Dynamix Underlying Funds.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Non-Diversification Risk: In order to track the composition of the index for which it seeks corresponding investment results, a Pacific Dynamix Underlying 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, a Pacific Dynamix Underlying Fund may become non-diversified under the 1940 Act. This increases the risk that the Pacific Dynamix Underlying 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 Pacific Dynamix Underlying Fund than a diversified fund with more investments.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Mortgage-Related and Other Asset-Backed Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related and other asset-backed securities are subject to certain risks affecting the housing market or the market for the assets underlying such securities. These securities are also subject to extension risk (the risk that rising interest rates extend the duration of fixed mortgage-related and other asset-backed securities, making them more sensitive to changes in interest rates), interest rate risk (the risk that rising interest rates will cause a decline in the value of a fixed income security), subprime risk (the risk that these securities have exposure to borrowers with lower credit risk, increasing potential default), prepayment risk (when interest rates decline, borrowers may pay off their mortgages sooner than expected which can reduce a Pacific Dynamix Underlying Fund’s returns because a Pacific Dynamix Underlying Fund may have to reinvest its assets at lower interest rates), call risk (similar to prepayment risk, an issuer may pay its obligations under a security sooner than expected), U.S. government securities risk
(securities backed by different U.S. government agencies are subject to varying levels of credit rating risk) and issuer risk (the risk that a private issuer cannot meet its obligations).
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Securities Lending Risk: A Pacific Dynamix Underlying Fund may engage in securities lending, which involves the risk that a Pacific Dynamix Underlying Fund may suffer a loss if the borrower fails to return the loaned securities in a timely manner or at all. A Pacific Dynamix Underlying 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.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce a Pacific Dynamix Underlying Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, the Pacific Dynamix Underlying Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, the Pacific Dynamix Underlying Fund’s yield (and total return) also may be low and the Pacific Dynamix Underlying Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Underlying Fund Risk: Because a Pacific Dynamix Underlying 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 Pacific Dynamix Underlying Fund, causing the sale of securities in a short timeframe and potential increases in expenses to the Pacific Dynamix Underlying Fund and its remaining shareholders, both of which could negatively impact performance.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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. A Pacific Dynamix Underlying 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.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of a Pacific Dynamix Underlying Fund’s investments denominated in or with exposure to that foreign currency.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Conflicts of Interest Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Conflicts of Interest Risk: PLFA is subject to competing interests that have the potential to influence its investment decisions for the Fund. For example, a Pacific Dynamix Underlying Fund that provides greater profitability to PLFA than another Pacific Dynamix Underlying Fund may create an incentive for PLFA to use that fund as a Pacific Dynamix Underlying Fund. In addition, PLFA may be influenced by its view of the best interests of Pacific Dynamix Underlying
Funds, such as a view that a Pacific Dynamix Underlying Fund may benefit from additional assets or could be harmed by redemptions. In addition, PLFA’s management of the Fund and the Fund’s risk/return profile may be influenced by the insurance companies that use the Fund as an investment option for their variable life and annuity contracts. These insurance companies may include affiliates of PLFA. PLFA seeks to identify and address any potential conflicts in a manner that is fair for Pacific Dynamix Underlying Funds, the Fund and the shareholders of the Fund. PLFA has adopted a policy under which investment decisions for the Fund must be made in the best interests of the Fund and its shareholders, and PLFA may take into account the interests of a Pacific Dynamix Underlying Fund and its shareholders when making investment decisions for the Fund.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Geographic Focus Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Geographic Focus Risk: If a Pacific Dynamix Underlying Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic, political, social, or other conditions in those countries or that region will have a significant impact on the Pacific Dynamix Underlying Fund’s performance. As a result, the Pacific Dynamix Underlying Fund’s performance may be more volatile than the performance of more geographically diversified funds.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Tracking Error Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Tracking Error Risk: Performance of a Pacific Dynamix Underlying Fund may vary from the performance of the index for which it seeks corresponding investment results due to imperfect correlation between the Pacific Dynamix Underlying Fund’s investments and that index.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Industry Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Industry Concentration Risk: Concentrating investments in a particular industry or group of industries makes a Pacific Dynamix Underlying Fund more susceptible to adverse economic, business, regulatory or other developments affecting that industry or group of industries, which could negatively impact performance.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Passive Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Technology Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Technology Sector Risk: Companies in the Technology sector face a number of risks, including operating in rapidly changing fields, abrupt or erratic market movements, limited product lines, markets or financial resources, management that is dependent on a limited number of people, short product cycles, aggressive pricing of products and services, new market entrants and rapid obsolescence of products and services due to technological innovations or changing consumer preferences. In addition, many U.S. companies in the Technology sector have diverse operations, with products or services in foreign markets, exposing them to risks associated with foreign markets.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Index Sampling Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 a Pacific Dynamix Underlying Fund seeks corresponding investment results, as opposed to holding the constituent securities of that index in the same proportion as the index 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.
Pacific Dynamix - Growth Portfolio | Pacific Dynamix - Growth Portfolio | Asset Allocation Fund Of Funds Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Asset Allocation Fund of Funds Risk: Asset allocation decisions, techniques, analyses, or models implemented by PLFA as the Fund’s investment adviser may not produce the expected returns, may cause the Fund’s shares to lose value or may cause the Fund to underperform other funds with similar investment goals. Although the theory behind asset allocation is that diversification among asset classes can help reduce volatility over the long term, PLFA’s assumptions about asset classes and Pacific Dynamix Underlying Funds may diverge from historical performance and assumptions used to develop allocations in light of actual market conditions. There is a risk that you could achieve better returns by investing in an individual fund or funds representing a single broad asset class rather than investing in a fund of funds. The Fund’s performance is also closely related to the Pacific Dynamix Underlying Funds performance and ability to meet their investment goals. Fund shareholders bear indirectly the expenses of the Pacific Dynamix Underlying Funds in which the Fund invests in addition to the Fund’s management fee so there is a risk of an additional layer or layers of fees. The Fund’s actual asset class allocations may deviate from the intended allocation because a Pacific Dynamix Underlying Fund’s investments can change due to market movements, the Pacific Dynamix Underlying Fund Manager’s investment decisions or other factors, which could result in the fund’s risk/​return target not being met. As a fund of funds, the Fund is exposed to the same risks as the Pacific Dynamix Underlying Funds in proportion to the Fund’s allocation to those Pacific Dynamix Underlying Funds.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Non-Diversification Risk: In order to track the composition of the index for which it seeks corresponding investment results, a Pacific Dynamix Underlying 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, a Pacific Dynamix Underlying Fund may become non-diversified under the 1940 Act. This increases the risk that the Pacific Dynamix Underlying 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 Pacific Dynamix Underlying Fund than a diversified fund with more investments.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Securities Lending Risk: A Pacific Dynamix Underlying Fund may engage in securities lending, which involves the risk that a Pacific Dynamix Underlying Fund may suffer a loss if the borrower fails to return the loaned securities in a timely manner or at all. A Pacific Dynamix Underlying 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.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce a Pacific Dynamix Underlying Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, the Pacific Dynamix Underlying Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, the Pacific Dynamix Underlying Fund’s yield (and total return) also may be low and the Pacific Dynamix Underlying Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Underlying Fund Risk: Because a Pacific Dynamix Underlying 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 Pacific Dynamix Underlying
Fund, causing the sale of securities in a short timeframe and potential increases in expenses to the Pacific Dynamix Underlying Fund and its remaining shareholders, both of which could negatively impact performance.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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. A Pacific Dynamix Underlying 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.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of a Pacific Dynamix Underlying Fund’s investments denominated in or with exposure to that foreign currency.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | Conflicts of Interest Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Conflicts of Interest Risk: PLFA is subject to competing interests that have the potential to influence its investment decisions for the Fund. For example, a Pacific Dynamix Underlying Fund that provides greater profitability to PLFA than another Pacific Dynamix Underlying Fund may create an incentive for PLFA to use that fund as a Pacific Dynamix Underlying Fund. In addition, PLFA may be influenced by its view of the best interests of Pacific Dynamix Underlying
Funds, such as a view that a Pacific Dynamix Underlying Fund may benefit from additional assets or could be harmed by redemptions. In addition, PLFA’s management of the Fund and the Fund’s risk/return profile may be influenced by the insurance companies that use the Fund as an investment option for their variable life and annuity contracts. These insurance companies may include affiliates of PLFA. PLFA seeks to identify and address any potential conflicts in a manner that is fair for Pacific Dynamix Underlying Funds, the Fund and the shareholders of the Fund. PLFA has adopted a policy under which investment decisions for the Fund must be made in the best interests of the Fund and its shareholders, and PLFA may take into account the interests of a Pacific Dynamix Underlying Fund and its shareholders when making investment decisions for the Fund.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | Geographic Focus Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Geographic Focus Risk: If a Pacific Dynamix Underlying Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic, political, social, or other conditions in those countries or that region will have a significant impact on the Pacific Dynamix Underlying Fund’s performance. As a result, the Pacific Dynamix Underlying Fund’s performance may be more volatile than the performance of more geographically diversified funds.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | Tracking Error Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Tracking Error Risk: Performance of a Pacific Dynamix Underlying Fund may vary from the performance of the index for which it seeks corresponding investment results due to imperfect correlation between the Pacific Dynamix Underlying Fund’s investments and that index.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | Industry Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Industry Concentration Risk: Concentrating investments in a particular industry or group of industries makes a Pacific Dynamix Underlying Fund more susceptible to adverse economic, business, regulatory or other developments affecting that industry or group of industries, which could negatively impact performance.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | Passive Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | Index Sampling Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 a Pacific Dynamix Underlying Fund seeks corresponding investment results, as opposed to holding the constituent securities of that index in the same proportion as the index 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.
Pacific Dynamix - Aggressive Growth Portfolio | Pacific Dynamix - Aggressive Growth Portfolio | Asset Allocation Fund Of Funds Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Asset Allocation Fund of Funds Risk: Asset allocation decisions, techniques, analyses, or models implemented by PLFA as the Fund’s investment adviser may not produce the expected returns, may cause the Fund’s shares to lose value or may cause the Fund to underperform other funds with similar investment goals. Although the theory behind asset allocation is that diversification among asset classes can help reduce volatility over the long term, PLFA’s assumptions about asset classes and Pacific Dynamix Underlying Funds may diverge from historical performance and assumptions used to develop allocations in light of actual market conditions. There is a risk that you could achieve better returns by investing in an individual fund or funds representing a single broad asset class rather than investing in a fund of funds. The Fund’s performance is also closely related to the Pacific Dynamix Underlying Funds performance and ability to meet their investment goals. Fund shareholders bear indirectly the expenses of the Pacific Dynamix Underlying Funds in which the Fund invests in addition to the Fund’s management fee so there is a risk of an additional layer or layers of fees. The Fund’s actual asset class allocations may deviate from the intended allocation because a Pacific Dynamix Underlying Fund’s investments can change due to market movements, the Pacific Dynamix Underlying Fund Manager’s investment decisions or other factors, which could result in the fund’s risk/​return target not being met. As a fund of funds, the Fund is exposed to the same risks as the Pacific Dynamix Underlying Funds in proportion to the Fund’s allocation to those Pacific Dynamix Underlying Funds.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Restricted Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Restricted Securities Risk: Unless registered for sale to the public under applicable federal securities law, restricted securities such as those issued pursuant to Rule 144A can be sold only in private transactions to qualified purchasers pursuant to an exemption from registration. The sale price realized from a private transaction could be less than the Portfolio Optimization Underlying Fund’s purchase price for the restricted security. It may be difficult to identify a qualified purchaser for a restricted security held by the Portfolio Optimization Underlying Fund and such security could be deemed illiquid. It may also be more difficult to value such securities.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Mortgage-Related and Other Asset-Backed Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related and other asset-backed securities are subject to certain risks affecting the housing market or the market for the assets underlying such securities. These securities are also subject to extension risk (the risk that rising interest rates extend the duration of fixed mortgage-related and other asset-backed securities, making them more sensitive to changes in interest rates), interest rate risk (the risk that rising interest rates will cause a decline in the value of a fixed income security), subprime risk (the risk that these securities have exposure to borrowers with lower credit risk, increasing potential default), prepayment risk (when interest rates decline, borrowers may pay off their mortgages sooner than expected which can reduce a Portfolio Optimization Underlying Fund’s returns because a Portfolio Optimization Underlying Fund may have to reinvest its assets at lower interest rates), call risk (similar to prepayment risk, an issuer may pay its obligations under a security sooner than expected), U.S. government securities risk (securities backed by different U.S. government agencies are subject to varying levels of credit rating risk), issuer risk (the risk that a private issuer cannot meet its obligations) and stripped mortgage-related securities risk (these securities are particularly sensitive to changes in interest rates).
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and
conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Securities Lending Risk: A Portfolio Optimization Underlying Fund may engage in securities lending, which involves the risk that a Portfolio Optimization Underlying Fund may suffer a loss if the borrower fails to return the loaned
securities in a timely manner or at all. A Portfolio Optimization Underlying 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.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Swap Agreements Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Swap Agreements Risk: Swap agreements are derivative contracts where the parties agree to exchange the returns earned on specific assets, such as the return on, or increase in value of, an amount invested in a particular “basket” of securities representing a certain index. As a derivative, it is subject to derivatives risk, including counterparty risk. Although certain standard swap agreements are centrally cleared through an exchange, which is expected to decrease counterparty risk and increase liquidity compared to swaps that are privately negotiated, central clearing does not eliminate these risks. In addition, a Portfolio Optimization Underlying Fund’s use of total return swap agreements is subject to market risks based upon changes in the value of the underlying index or reference instrument.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Derivatives Risk: The use of forward commitments, futures contracts, options or swap agreements (each a type of derivative instrument) as a principal investment strategy subjects a Portfolio Optimization Underlying Fund to a number of risks, including: counterparty risk, leverage risk, market risk, regulatory risk, liquidity and valuation risk, operational risk, correlation risk, legal risk and premium risk. Derivatives may be riskier than other types of investments and may increase the Portfolio Optimization Underlying Fund’s volatility and risk of loss.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Leverage Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Leverage Risk: A Portfolio Optimization Underlying Fund may invest in forward commitments, futures contracts, options or swap agreements, including taking short positions using certain derivatives, as a principal investment strategy. These derivative investments give rise to a form of leverage. Leverage is investment exposure that exceeds the initial amount invested. The loss on a leveraged investment may far exceed a Portfolio Optimization Underlying Fund’s principal amount invested. Leverage can magnify a Portfolio Optimization Underlying Fund’s gains and losses and therefore increase its volatility.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce a Portfolio Optimization Underlying Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, a Portfolio Optimization Underlying Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, a Portfolio Optimization Underlying Fund’s yield (and total return) also may be low and a Portfolio Optimization Underlying Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Financial Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 a Portfolio Optimization Underlying Fund’s performance.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Underlying Fund Risk: Because a Portfolio Optimization Underlying 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 Portfolio Optimization Underlying Fund, causing the sale of securities in a short timeframe and potential increases in expenses to the Portfolio Optimization Underlying Fund and its remaining shareholders, both of which could negatively impact performance.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | High Yield/High Risk or “Junk” Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
High Yield/High Risk or “Junk” Securities Risk: High yield/​high risk securities are typically issued by companies that are highly leveraged, less creditworthy or financially distressed and are considered to be mostly speculative in nature (high risk), subject to greater liquidity risk, and subject to a greater risk of default than higher rated securities. High yield/high risk securities (including loans) may be more volatile than investment grade securities.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Floating Rate Loan Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Floating Rate Loan Risk: Floating rate loans (or bank loans) are usually rated below investment grade and thus are subject to high yield/high risk or “junk” securities risk. The market for floating rate loans is a private interbank resale market and thus may be subject to irregular trading activity, wide bid/ask spreads and delayed settlement periods. Purchases and sales of loans are generally subject to contractual
restrictions that must be fulfilled before a loan can be bought or sold. These restrictions may hamper a Portfolio Optimization Underlying Fund’s ability to buy or sell loans and negatively affect the transaction price. A significant portion of the floating rate loans held by a Portfolio Optimization Underlying Fund may be “covenant lite” loans that contain fewer or less restrictive constraints on the borrower or other borrower-friendly characteristics and offer less protections for investors than covenant loans. It may take longer than seven days for transactions in loans to settle. This may result in cash proceeds not being immediately available to a Portfolio Optimization Underlying Fund, requiring a Portfolio Optimization Underlying Fund to borrow cash which would increase a Portfolio Optimization Underlying Fund’s expenses. The Portfolio Optimization Underlying Fund is also subject to credit risk with respect to the issuer of the loan. Investments in junior loans involve a higher degree of overall risk.
U.S. federal securities laws afford certain protections against fraud and misrepresentation in connection with the offering or sale of a security, as well as against manipulation of trading markets for securities. However, it is unclear whether these protections are available to an investment in a loan.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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. A Portfolio Optimization Underlying 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.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Emerging Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Emerging Markets Risk: Investments in or exposure to investments in emerging market countries may be riskier than investments in or exposure to investments in U.S. and other developed markets for many reasons, including smaller market capitalizations, greater price volatility, less liquidity, lower credit quality, a higher degree of political and economic instability, the impact of economic sanctions, less governmental regulation and supervision of the financial industry and markets, and less stringent financial reporting and accounting standards and controls.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Inflation-Indexed Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Inflation-Indexed Debt Securities Risk: The principal values of inflation-indexed debt securities tend to increase when inflation rises and decrease when inflation falls.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Convertible Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Convertible Securities Risk: Convertible securities are generally subject to the risks of stocks when the underlying stock price is high relative to the conversion price (because the conversion feature is more valuable) and to the risks of debt securities when the underlying stock price is low relative to the conversion price (because the conversion feature is less valuable). Convertible securities are also generally subject to credit risk, as they tend to be of lower credit quality, and interest rate risk, though they generally are not as sensitive to interest rate changes as conventional debt securities. A convertible security’s value also tends to increase and decrease with the underlying stock and typically has less potential for gain or loss than the underlying stock.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of a Portfolio Optimization Underlying Fund’s investments denominated in or with exposure to that foreign currency.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Conflicts of Interest Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Conflicts of Interest Risk: PLFA is subject to competing interests that have the potential to influence its investment decisions for the Fund. For example, a Portfolio Optimization Underlying Fund that provides greater profitability to PLFA than another Portfolio Optimization Underlying Fund may create an incentive for PLFA to use that fund as a Portfolio Optimization Underlying Fund. In addition, PLFA may be influenced by its view of the best interests of Portfolio Optimization Underlying Funds, such as a view that a Portfolio Optimization Underlying Fund may benefit from additional assets or could be harmed by redemptions. In addition, PLFA’s management of the Fund and the Fund’s risk/return profile may be influenced by the insurance companies that use the Fund as an investment option for their variable life and annuity contracts. These insurance companies may include affiliates of PLFA. PLFA seeks to identify and address any potential conflicts in a manner that is fair for Portfolio Optimization Underlying Funds, the Fund and the shareholders of the Fund and Portfolio Optimization Underlying Fund. PLFA has adopted a policy under which investment decisions for the Fund must be made in the best interests of the Fund
and its shareholders, and PLFA may take into account the interests of a Portfolio Optimization Underlying Fund and its shareholders when making investment decisions for the Fund.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Geographic Focus Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Geographic Focus Risk: If a Portfolio Optimization Underlying Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic,
political, social, or other conditions in those countries or that region will have a significant impact on the Portfolio Optimization Underlying Fund’s performance. As a result, the Portfolio Optimization Underlying Fund’s performance may be more volatile than the performance of more geographically diversified funds.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Technology Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Technology Sector Risk: Companies in the Technology sector face a number of risks, including operating in rapidly changing fields, abrupt or erratic market movements, limited product lines, markets or financial resources, management that is dependent on a limited number of people, short product cycles, aggressive pricing of products and services, new market entrants and rapid obsolescence of products and services due to technological innovations or changing consumer preferences. In addition, many U.S. companies in the Technology sector have diverse operations, with products or services in foreign markets, exposing them to risks associated with foreign markets.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Asset Allocation Fund Of Funds Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Asset Allocation Fund of Funds Risk: Asset allocation decisions, techniques, analyses, or models implemented by PLFA as the Fund’s investment adviser may not produce the expected returns, may cause the Fund’s shares to lose value or may cause the Fund to underperform other funds with similar investment goals. Although the theory behind asset allocation is that diversification among asset classes can help reduce volatility over the long term, PLFA’s assumptions about asset classes and Portfolio Optimization Underlying Funds may diverge from historical performance and assumptions used to develop allocations in light of actual market conditions. There is a risk that you could achieve better returns by investing in an individual fund or funds representing a single broad asset class rather than investing in a fund of funds. The Fund’s performance is also closely related to the Portfolio Optimization Underlying Funds performance and ability to meet their investment goals. Fund shareholders bear indirectly the expenses of the Portfolio Optimization Underlying Funds in which the Fund invests in addition to the Fund’s management fee so there is a risk of an additional layer or layers of fees. The Fund’s actual asset class allocations may deviate from the intended allocation because a Portfolio Optimization Underlying Fund’s investments can change due to market movements, the Portfolio Optimization Underlying Fund Manager’s investment decisions or other factors, which could result in the fund’s risk/return target not being met. As a fund of funds, the Fund is exposed to the same risks as the Portfolio Optimization Underlying Funds in proportion to the Fund’s allocation to those Portfolio Optimization Underlying Funds.
Portfolio Optimization Conservative Portfolio | Portfolio Optimization Conservative Portfolio | Underlying Fund Conflicts of Interest Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Conflicts of Interest Risk: PLFA is subject to competing interests that have the potential to influence its investment decisions for a Portfolio Optimization Underlying Fund with respect to the allocation of the assets of a Portfolio Optimization Underlying Fund that has more than one strategy. For example, the use of one strategy of a Portfolio Optimization Underlying Fund that provides greater profitability to PLFA than the other may create an incentive for PLFA to use that strategy. PLFA seeks to identify and address any potential conflicts in a manner that is fair to a Portfolio Optimization Underlying Fund and its shareholders. PLFA has adopted a policy under which investment decisions for a Portfolio Optimization Underlying Fund must be made in the best interests of a Portfolio Optimization Underlying Fund and its shareholders.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Restricted Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Restricted Securities Risk: Unless registered for sale to the public under applicable federal securities law, restricted securities such as those issued pursuant to Rule 144A can be sold only in private transactions to qualified purchasers pursuant to an exemption from registration. The sale price realized from a private transaction could be less than the Portfolio Optimization Underlying Fund’s purchase price for the restricted security. It may be difficult to identify a qualified purchaser for a restricted security held by the Portfolio Optimization Underlying Fund and such security could be deemed illiquid. It may also be more difficult to value such securities.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Mortgage-Related and Other Asset-Backed Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related and other asset-backed securities are subject to certain risks affecting the housing market or the market for the assets underlying such securities. These securities are also subject to extension risk (the risk that rising interest rates extend the duration of fixed mortgage-related and other asset-backed securities, making them more sensitive to changes in interest rates), interest rate risk (the risk that rising interest rates will cause a decline in the value of a fixed income security), subprime risk (the risk that these securities have exposure to borrowers with lower credit risk, increasing potential default), prepayment risk (when interest rates decline, borrowers may pay off their mortgages sooner than expected which can reduce a Portfolio Optimization Underlying Fund’s returns because a Portfolio Optimization Underlying Fund may have to reinvest its assets at lower interest rates), call risk (similar to prepayment risk, an issuer may pay its obligations under a security sooner than expected), U.S. government securities risk (securities backed by different U.S. government agencies are subject to varying levels of credit rating risk), issuer risk (the risk that a private issuer cannot meet its obligations) and stripped mortgage-related securities risk (these securities are particularly sensitive to changes in interest rates).
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and
conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Securities Lending Risk: A Portfolio Optimization Underlying Fund may engage in securities lending, which involves the risk that a Portfolio Optimization Underlying Fund may suffer a loss if the borrower fails to return the loaned securities in a timely manner or at all. A Portfolio Optimization Underlying 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.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Swap Agreements Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Swap Agreements Risk: Swap agreements are derivative contracts where the parties agree to exchange the returns earned on specific assets, such as the return on, or increase in value of, an amount invested in a particular “basket” of securities representing a certain index. As a derivative, it is subject to derivatives risk, including counterparty risk. Although certain standard swap agreements are centrally cleared through an exchange, which is expected to decrease counterparty risk
and increase liquidity compared to swaps that are privately negotiated, central clearing does not eliminate these risks. In addition, a Portfolio Optimization Underlying Fund’s use of total return swap agreements is subject to market risks based upon changes in the value of the underlying index or reference instrument.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Derivatives Risk: The use of forward commitments, futures contracts, options or swap agreements (each a type of derivative instrument) as a principal investment strategy subjects a Portfolio Optimization Underlying Fund to a number of risks, including: counterparty risk, leverage risk, market risk, regulatory risk, liquidity and valuation risk, operational risk, correlation risk, legal risk and premium risk. Derivatives may be riskier than other types of investments and may increase the Portfolio Optimization Underlying Fund’s volatility and risk of loss.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Leverage Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Leverage Risk: A Portfolio Optimization Underlying Fund may invest in forward commitments, futures contracts, options or swap agreements, including taking short positions using certain derivatives, as a principal investment strategy. These derivative investments give rise to a form of leverage. Leverage is investment exposure that exceeds the initial amount invested. The loss on a leveraged investment may far exceed a Portfolio Optimization Underlying Fund’s principal amount invested. Leverage can magnify a Portfolio Optimization Underlying Fund’s gains and losses and therefore increase its volatility.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce a Portfolio Optimization Underlying Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, a Portfolio Optimization Underlying Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, a Portfolio Optimization Underlying Fund’s yield (and total return) also may be low and a Portfolio Optimization Underlying Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Financial Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 a Portfolio Optimization Underlying Fund’s performance.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Underlying Fund Risk: Because a Portfolio Optimization Underlying 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 Portfolio Optimization Underlying Fund, causing the sale of securities in a short
timeframe and potential increases in expenses to the Portfolio Optimization Underlying Fund and its remaining shareholders, both of which could negatively impact performance.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | High Yield/High Risk or “Junk” Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
High Yield/High Risk or “Junk” Securities Risk: High yield/​high risk securities are typically issued by companies that are highly leveraged, less creditworthy or financially distressed and are considered to be mostly speculative in nature (high risk), subject to greater liquidity risk, and subject to a greater risk of default than higher rated securities. High yield/high risk securities (including loans) may be more volatile than investment grade securities.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Floating Rate Loan Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Floating Rate Loan Risk: Floating rate loans (or bank loans) are usually rated below investment grade and thus are subject to high yield/high risk or “junk” securities risk. The market for floating rate loans is a private interbank resale market and thus may be subject to irregular trading activity, wide bid/ask spreads and delayed settlement periods. Purchases
and sales of loans are generally subject to contractual restrictions that must be fulfilled before a loan can be bought or sold. These restrictions may hamper a Portfolio Optimization Underlying Fund’s ability to buy or sell loans and negatively affect the transaction price. A significant portion of the floating rate loans held by a Portfolio Optimization Underlying Fund may be “covenant lite” loans that contain fewer or less restrictive constraints on the borrower or other borrower-friendly characteristics and offer less protections for investors than covenant loans. It may take longer than seven days for transactions in loans to settle. This may result in cash proceeds not being immediately available to a Portfolio Optimization Underlying Fund, requiring a Portfolio Optimization Underlying Fund to borrow cash which would increase a Portfolio Optimization Underlying Fund’s expenses. The Portfolio Optimization Underlying Fund is also subject to credit risk with respect to the issuer of the loan. Investments in junior loans involve a higher degree of overall risk.
U.S. federal securities laws afford certain protections against fraud and misrepresentation in connection with the offering or sale of a security, as well as against manipulation of trading markets for securities. However, it is unclear whether these protections are available to an investment in a loan.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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. A Portfolio Optimization Underlying 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.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Emerging Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Emerging Markets Risk: Investments in or exposure to investments in emerging market countries may be riskier than investments in or exposure to investments in U.S. and other developed markets for many reasons, including smaller market capitalizations, greater price volatility, less liquidity, lower credit quality, a higher degree of political and economic instability, the impact of economic sanctions, less governmental regulation and supervision of the financial industry and markets, and less stringent financial reporting and accounting standards and controls.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Inflation-Indexed Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Inflation-Indexed Debt Securities Risk: The principal values of inflation-indexed debt securities tend to increase when inflation rises and decrease when inflation falls.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Convertible Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Convertible Securities Risk: Convertible securities are generally subject to the risks of stocks when the underlying stock price is high relative to the conversion price (because the conversion feature is more valuable) and to the risks of debt securities when the underlying stock price is low relative to the conversion price (because the conversion feature is less valuable). Convertible securities are also generally subject to credit risk, as they tend to be of lower credit quality, and interest rate risk, though they generally are not as sensitive to interest rate changes as conventional debt securities. A convertible security’s value also tends to increase and decrease with the underlying stock and typically has less potential for gain or loss than the underlying stock.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of a Portfolio Optimization Underlying Fund’s investments denominated in or with exposure to that foreign currency.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Conflicts of Interest Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Conflicts of Interest Risk: PLFA is subject to competing interests that have the potential to influence its investment decisions for the Fund. For example, a Portfolio Optimization Underlying Fund that provides greater profitability to PLFA than another Portfolio Optimization Underlying Fund may create an incentive for PLFA to use that fund as a Portfolio Optimization Underlying Fund. In addition, PLFA may be influenced by its view of the best interests of Portfolio Optimization Underlying Funds, such as a view that a Portfolio Optimization Underlying Fund may benefit from additional assets or could be harmed by redemptions. In addition, PLFA’s management of the Fund and the Fund’s risk/return profile may be influenced by the insurance companies that use the Fund as an investment option for their variable life and annuity contracts. These insurance companies may include affiliates of PLFA. PLFA seeks to identify and address any potential conflicts in a manner that is fair for Portfolio Optimization Underlying Funds, the Fund and the shareholders of the Fund and Portfolio Optimization Underlying Fund. PLFA has adopted a policy under which investment decisions for the Fund must be made in the best interests of the Fund
and its shareholders, and PLFA may take into account the interests of a Portfolio Optimization Underlying Fund and its shareholders when making investment decisions for the Fund.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Geographic Focus Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Geographic Focus Risk: If a Portfolio Optimization Underlying Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic, political, social, or other conditions in those countries or that region will have a significant impact on the Portfolio Optimization Underlying Fund’s performance. As a result, the Portfolio Optimization Underlying Fund’s performance may be more volatile than the performance of more geographically diversified funds.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Technology Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Technology Sector Risk: Companies in the Technology sector face a number of risks, including operating in rapidly changing fields, abrupt or erratic market movements, limited product lines, markets or financial resources, management that is dependent on a limited number of people, short product cycles, aggressive pricing of products and services, new market entrants and rapid obsolescence of products and services due to technological innovations or changing consumer preferences. In addition, many U.S. companies in the Technology sector have diverse operations, with products or services in foreign markets, exposing them to risks associated with foreign markets.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Asset Allocation Fund Of Funds Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Asset Allocation Fund of Funds Risk: Asset allocation decisions, techniques, analyses, or models implemented by PLFA as the Fund’s investment adviser may not produce the expected returns, may cause the Fund’s shares to lose value or may cause the Fund to underperform other funds with similar investment goals. Although the theory behind asset allocation is that diversification among asset classes can help reduce volatility over the long term, PLFA’s assumptions about asset classes and Portfolio Optimization Underlying Funds may diverge from historical performance and assumptions used to develop allocations in light of actual market conditions. There is a risk that you could achieve better returns by investing in an individual fund or funds representing a single broad asset class rather than investing in a fund of funds. The Fund’s performance is also closely related to the Portfolio Optimization Underlying Funds performance and ability to meet their investment goals. Fund shareholders bear indirectly the expenses of the Portfolio Optimization Underlying Funds in which the Fund invests in addition to the Fund’s management fee so there is a risk of an additional layer or layers of fees. The Fund’s actual asset class allocations may deviate from the intended allocation because a Portfolio Optimization Underlying Fund’s investments can change due to market movements, the Portfolio Optimization Underlying Fund Manager’s investment decisions or other factors, which could result in the fund’s risk/return target not being met. As a fund of funds, the Fund is exposed to the same risks as the Portfolio Optimization Underlying Funds in proportion to the Fund’s allocation to those Portfolio Optimization Underlying Funds.
Portfolio Optimization Moderate-Conservative Portfolio | Portfolio Optimization Moderate-Conservative Portfolio | Underlying Fund Conflicts of Interest Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Conflicts of Interest Risk: PLFA is subject to competing interests that have the potential to influence its investment decisions for a Portfolio Optimization Underlying Fund with respect to the allocation of the assets of a Portfolio Optimization Underlying Fund that has more than one strategy. For example, the use of one strategy of a Portfolio Optimization Underlying Fund that provides greater profitability to PLFA than the other may create an incentive for PLFA to use that strategy. PLFA seeks to identify and address any potential conflicts in a manner that is fair to a Portfolio Optimization Underlying Fund and its shareholders. PLFA has adopted a policy under which investment decisions for a Portfolio Optimization Underlying Fund must be made in the best interests of a Portfolio Optimization Underlying Fund and its shareholders.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Restricted Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Restricted Securities Risk: Unless registered for sale to the public under applicable federal securities law, restricted securities such as those issued pursuant to Rule 144A can be sold only in private transactions to qualified purchasers pursuant to an exemption from registration. The sale price realized from a private transaction could be less than the Portfolio Optimization Underlying Fund’s purchase price for the restricted security. It may be difficult to identify a qualified purchaser for a restricted security held by the Portfolio Optimization Underlying Fund and such security could be deemed illiquid. It may also be more difficult to value such securities.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Mortgage-Related and Other Asset-Backed Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related and other asset-backed securities are subject to certain risks affecting the housing market or the market for the assets underlying such securities. These securities are also subject to extension risk (the risk that rising interest rates extend the duration of fixed mortgage-related and other asset-backed securities, making them more sensitive to changes in interest rates), interest rate risk (the risk that rising interest rates will cause a decline in the value of a fixed income security), subprime risk (the risk that these securities
have exposure to borrowers with lower credit risk, increasing potential default), prepayment risk (when interest rates decline, borrowers may pay off their mortgages sooner than expected which can reduce a Portfolio Optimization Underlying Fund’s returns because a Portfolio Optimization Underlying Fund may have to reinvest its assets at lower interest rates), call risk (similar to prepayment risk, an issuer may pay its obligations under a security sooner than expected), U.S. government securities risk (securities backed by different U.S. government agencies are subject to varying levels of credit rating risk), issuer risk (the risk that a private issuer cannot meet its obligations) and stripped mortgage-related securities risk (these securities are particularly sensitive to changes in interest rates).
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Securities Lending Risk: A Portfolio Optimization Underlying Fund may engage in securities lending, which involves the risk that a Portfolio Optimization Underlying Fund may suffer a loss if the borrower fails to return the loaned securities in a timely manner or at all. A Portfolio Optimization Underlying 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.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Swap Agreements Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Swap Agreements Risk: Swap agreements are derivative contracts where the parties agree to exchange the returns earned on specific assets, such as the return on, or increase in value of, an amount invested in a particular “basket” of securities representing a certain index. As a derivative, it is subject to derivatives risk, including counterparty risk. Although certain standard swap agreements are centrally cleared through an exchange, which is expected to decrease counterparty risk and increase liquidity compared to swaps that are privately negotiated, central clearing does not eliminate these risks. In addition, a Portfolio Optimization Underlying Fund’s use of total return swap agreements is subject to market risks based upon changes in the value of the underlying index or reference instrument.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Derivatives Risk: The use of forward commitments, futures contracts, options or swap agreements (each a type of derivative instrument) as a principal investment strategy subjects a Portfolio Optimization Underlying Fund to a number of risks, including: counterparty risk, leverage risk, market risk, regulatory risk, liquidity and valuation risk, operational risk, correlation risk, legal risk and premium risk. Derivatives may be riskier than other types of investments and may increase the Portfolio Optimization Underlying Fund’s volatility and risk of loss.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Leverage Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Leverage Risk: A Portfolio Optimization Underlying Fund may invest in forward commitments, futures contracts, options or swap agreements, including taking short positions using certain derivatives, as a principal investment strategy. These derivative investments give rise to a form of leverage. Leverage is investment exposure that exceeds the initial amount invested. The loss on a leveraged investment may far exceed a Portfolio Optimization Underlying Fund’s principal amount invested. Leverage can magnify a Portfolio Optimization Underlying Fund’s gains and losses and therefore increase its volatility.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce a Portfolio Optimization Underlying Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, a Portfolio Optimization Underlying Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, a Portfolio Optimization Underlying Fund’s yield (and total return) also may be low and a Portfolio Optimization Underlying Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Financial Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 a Portfolio Optimization Underlying Fund’s performance.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Underlying Fund Risk: Because a Portfolio Optimization Underlying 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 Portfolio Optimization Underlying Fund, causing the sale of securities in a short timeframe and potential increases in expenses to the Portfolio Optimization Underlying Fund and its remaining shareholders, both of which could negatively impact performance.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | High Yield/High Risk or “Junk” Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
High Yield/High Risk or “Junk” Securities Risk: High yield/​high risk securities are typically issued by companies that are highly leveraged, less creditworthy or financially distressed and are considered to be mostly speculative in nature (high risk), subject to greater liquidity risk, and subject to a greater risk of default than higher rated securities. High yield/high risk securities (including loans) may be more volatile than investment grade securities.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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. A Portfolio Optimization Underlying 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.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Emerging Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Emerging Markets Risk: Investments in or exposure to investments in emerging market countries may be riskier than investments in or exposure to investments in U.S. and other developed markets for many reasons, including smaller market capitalizations, greater price volatility, less liquidity, lower credit quality, a higher degree of political and economic instability, the impact of economic sanctions, less governmental regulation and supervision of the financial industry and markets, and less stringent financial reporting and accounting standards and controls.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Inflation-Indexed Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Inflation-Indexed Debt Securities Risk: The principal values of inflation-indexed debt securities tend to increase when inflation rises and decrease when inflation falls.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Convertible Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Convertible Securities Risk: Convertible securities are generally subject to the risks of stocks when the underlying stock price is high relative to the conversion price (because the conversion feature is more valuable) and to the risks of debt securities when the underlying stock price is low relative to the conversion price (because the conversion feature is less valuable). Convertible securities are also generally subject to credit risk, as they tend to be of lower credit quality, and interest rate risk, though they generally are not as sensitive to interest rate changes as conventional debt securities. A convertible security’s value also tends to increase and decrease with the underlying stock and typically has less potential for gain or loss than the underlying stock.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of a Portfolio Optimization Underlying Fund’s investments denominated in or with exposure to that foreign currency.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Conflicts of Interest Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Conflicts of Interest Risk: PLFA is subject to competing interests that have the potential to influence its investment decisions for the Fund. For example, a Portfolio Optimization Underlying Fund that provides greater profitability to PLFA than another Portfolio Optimization Underlying Fund may create an incentive for PLFA to use that fund as a Portfolio Optimization Underlying Fund. In addition, PLFA may
be influenced by its view of the best interests of Portfolio Optimization Underlying Funds, such as a view that a Portfolio Optimization Underlying Fund may benefit from additional assets or could be harmed by redemptions. In addition, PLFA’s management of the Fund and the Fund’s risk/return profile may be influenced by the insurance companies that use the Fund as an investment option for their variable life and annuity contracts. These insurance companies may include affiliates of PLFA. PLFA seeks to identify and address any potential conflicts in a manner that is fair for Portfolio Optimization Underlying Funds, the Fund and the shareholders of the Fund and Portfolio Optimization Underlying Fund. PLFA has adopted a policy under which investment decisions for the Fund must be made in the best interests of the Fund and its shareholders, and PLFA may take into account the interests of a Portfolio Optimization Underlying Fund and its shareholders when making investment decisions for the Fund.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Geographic Focus Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Geographic Focus Risk: If a Portfolio Optimization Underlying Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic, political, social, or other conditions in those countries or that region will have a significant impact on the Portfolio Optimization Underlying Fund’s performance. As a result, the Portfolio Optimization Underlying Fund’s performance may be more volatile than the performance of more geographically diversified funds.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Technology Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Technology Sector Risk: Companies in the Technology sector face a number of risks, including operating in rapidly changing fields, abrupt or erratic market movements, limited product lines, markets or financial resources, management that is dependent on a limited number of people, short product cycles, aggressive pricing of products and services, new market entrants and rapid obsolescence of products and services due to technological innovations or changing consumer preferences. In addition, many U.S. companies in the Technology sector have diverse operations, with products or services in foreign markets, exposing them to risks associated with foreign markets.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Consumer Non-Cyclical Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Consumer Non-Cyclical Sector Risk: Companies in the Consumer Non-cyclical products and services sector (which are generally considered essential staples) may be adversely impacted by changes in domestic and global economic conditions, consumer confidence and preferences, disposable household income and consumer spending, product cycles, marketing, demographics, production spending, competition, government regulations and factors impacting the supply, demand and prices of raw materials.
Portfolio Optimization Moderate Portfolio | Portfolio Optimization Moderate Portfolio | Asset Allocation Fund Of Funds Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Asset Allocation Fund of Funds Risk: Asset allocation decisions, techniques, analyses, or models implemented by PLFA as the Fund’s investment adviser may not produce the expected returns, may cause the Fund’s shares to lose value or may cause the Fund to underperform other funds with similar investment goals. Although the theory behind asset allocation is that diversification among asset classes can help reduce volatility over the long term, PLFA’s assumptions about asset classes and Portfolio Optimization Underlying Funds may diverge from historical performance and assumptions used to develop allocations in light of actual market conditions. There is a risk that you could achieve better returns by investing in an individual fund or funds representing a single broad asset class rather than investing in a fund of funds. The Fund’s performance is also closely related to the Portfolio Optimization Underlying Funds performance and ability to meet their investment goals. Fund shareholders bear indirectly the expenses of the Portfolio Optimization Underlying Funds in which the Fund invests in addition to the Fund’s management fee so there is a risk of an additional layer or layers of fees. The Fund’s actual asset class allocations may deviate from the intended allocation because a Portfolio Optimization Underlying Fund’s investments can change due to market movements, the Portfolio Optimization Underlying Fund Manager’s investment decisions or other factors, which could result in the fund’s risk/return target not being met. As a fund of funds, the Fund is exposed to the same risks as the Portfolio Optimization Underlying Funds in proportion to the Fund’s allocation to those Portfolio Optimization Underlying Funds.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Mortgage-Related and Other Asset-Backed Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related and other asset-backed securities are subject to certain risks affecting the housing market or the market for the assets underlying such securities. These securities are also subject to extension risk (the risk that rising interest rates extend the duration of fixed mortgage-related and other asset-backed securities, making them more sensitive to changes in interest rates), interest rate risk (the risk that rising interest rates will cause a decline in the value of a fixed income security), subprime risk (the risk that these securities have exposure to borrowers with lower credit risk, increasing potential default), prepayment risk (when interest rates decline, borrowers may pay off their mortgages sooner than expected which can reduce a Portfolio Optimization Underlying Fund’s returns because a Portfolio Optimization Underlying Fund may have to reinvest its assets at lower interest rates), call risk (similar to prepayment risk, an issuer may pay its obligations under a security sooner than expected), U.S. government securities risk (securities backed by different U.S. government agencies are subject to varying levels of credit rating risk), issuer risk (the risk that a private issuer cannot meet its obligations) and stripped mortgage-related securities risk (these securities are particularly sensitive to changes in interest rates).
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Securities Lending Risk: A Portfolio Optimization Underlying Fund may engage in securities lending, which involves the risk that a Portfolio Optimization Underlying Fund may suffer a loss if the borrower fails to return the loaned securities in a timely manner or at all. A Portfolio Optimization Underlying 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.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Swap Agreements Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Swap Agreements Risk: Swap agreements are derivative contracts where the parties agree to exchange the returns earned on specific assets, such as the return on, or increase in value of, an amount invested in a particular “basket” of securities representing a certain index. As a derivative, it is subject to derivatives risk, including counterparty risk. Although certain standard swap agreements are centrally cleared through an exchange, which is expected to decrease counterparty risk and increase liquidity compared to swaps that are privately negotiated, central clearing does not eliminate these risks. In addition, a Portfolio Optimization Underlying Fund’s use
of total return swap agreements is subject to market risks based upon changes in the value of the underlying index or reference instrument.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Derivatives Risk: The use of forward commitments, futures contracts, options or swap agreements (each a type of derivative instrument) as a principal investment strategy subjects a Portfolio Optimization Underlying Fund to a number of risks, including: counterparty risk, leverage risk, market risk, regulatory risk, liquidity and valuation risk, operational risk, correlation risk, legal risk and premium risk. Derivatives may be riskier than other types of investments and may increase the Portfolio Optimization Underlying Fund’s volatility and risk of loss.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Leverage Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Leverage Risk: A Portfolio Optimization Underlying Fund may invest in forward commitments, futures contracts, options or swap agreements, including taking short positions using certain derivatives, as a principal investment strategy. These derivative investments give rise to a form of leverage. Leverage is investment exposure that exceeds the initial amount invested. The loss on a leveraged investment may far exceed a Portfolio Optimization Underlying Fund’s principal amount invested. Leverage can magnify a Portfolio Optimization Underlying Fund’s gains and losses and therefore increase its volatility.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce a Portfolio Optimization Underlying Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, a Portfolio Optimization Underlying Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, a Portfolio Optimization Underlying Fund’s yield (and total return) also may be low and a Portfolio Optimization Underlying Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Financial Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 a Portfolio Optimization Underlying Fund’s performance.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Underlying Fund Risk: Because a Portfolio Optimization Underlying 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 Portfolio Optimization Underlying Fund, causing the sale of securities in a short timeframe and potential increases in expenses to the Portfolio Optimization Underlying Fund and its remaining shareholders, both of which could negatively impact performance.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | High Yield/High Risk or “Junk” Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
High Yield/High Risk or “Junk” Securities Risk: High yield/​high risk securities are typically issued by companies that are highly leveraged, less creditworthy or financially distressed and are considered to be mostly speculative in nature (high risk), subject to greater liquidity risk, and subject to a greater risk of default than higher rated securities. High yield/high risk securities (including loans) may be more volatile than investment grade securities.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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. A Portfolio Optimization Underlying 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.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Emerging Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Emerging Markets Risk: Investments in or exposure to investments in emerging market countries may be riskier than investments in or exposure to investments in U.S. and other developed markets for many reasons, including smaller market capitalizations, greater price volatility, less liquidity, lower credit quality, a higher degree of political and economic instability, the impact of economic sanctions, less governmental regulation and supervision of the financial industry and markets, and less stringent financial reporting and accounting standards and controls.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of a Portfolio Optimization Underlying Fund’s investments denominated in or with exposure to that foreign currency.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Conflicts of Interest Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Conflicts of Interest Risk: PLFA is subject to competing interests that have the potential to influence its investment decisions for the Fund. For example, a Portfolio Optimization Underlying Fund that provides greater profitability to PLFA than another Portfolio Optimization Underlying Fund may create an incentive for PLFA to use that fund as a Portfolio Optimization Underlying Fund. In addition, PLFA may
be influenced by its view of the best interests of Portfolio Optimization Underlying Funds, such as a view that a Portfolio Optimization Underlying Fund may benefit from additional assets or could be harmed by redemptions. In addition, PLFA’s management of the Fund and the Fund’s risk/return profile may be influenced by the insurance companies that use the Fund as an investment option for their variable life and annuity contracts. These insurance companies may include affiliates of PLFA. PLFA seeks to identify and address any potential conflicts in a manner that is fair for Portfolio Optimization Underlying Funds, the Fund and the shareholders of the Fund and Portfolio Optimization Underlying Fund. PLFA has adopted a policy under which investment decisions for the Fund must be made in the best interests of the Fund and its shareholders, and PLFA may take into account the interests of a Portfolio Optimization Underlying Fund and its shareholders when making investment decisions for the Fund.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Geographic Focus Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Geographic Focus Risk: If a Portfolio Optimization Underlying Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic, political, social, or other conditions in those countries or that region will have a significant impact on the Portfolio Optimization Underlying Fund’s performance. As a result, the Portfolio Optimization Underlying Fund’s performance may be more volatile than the performance of more geographically diversified funds.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Technology Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Technology Sector Risk: Companies in the Technology sector face a number of risks, including operating in rapidly changing fields, abrupt or erratic market movements, limited product lines, markets or financial resources, management that is dependent on a limited number of people, short product cycles, aggressive pricing of products and services, new market entrants and rapid obsolescence of products and services due to technological innovations or changing consumer preferences. In addition, many U.S. companies in the Technology sector have diverse operations, with products or services in foreign markets, exposing them to risks associated with foreign markets.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Consumer Non-Cyclical Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Consumer Non-Cyclical Sector Risk: Companies in the Consumer Non-cyclical products and services sector (which are generally considered essential staples) may be adversely impacted by changes in domestic and global economic conditions, consumer confidence and preferences, disposable household income and consumer spending, product cycles, marketing, demographics, production spending, competition, government regulations and factors impacting the supply, demand and prices of raw materials.
Portfolio Optimization Growth Portfolio | Portfolio Optimization Growth Portfolio | Asset Allocation Fund Of Funds Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Asset Allocation Fund of Funds Risk: Asset allocation decisions, techniques, analyses, or models implemented by PLFA as the Fund’s investment adviser may not produce the expected returns, may cause the Fund’s shares to lose value or may cause the Fund to underperform other funds with similar investment goals. Although the theory behind asset allocation is that diversification among asset classes can help reduce volatility over the long term, PLFA’s assumptions about asset classes and Portfolio Optimization Underlying Funds may diverge from historical performance and assumptions used to develop allocations in light of actual market conditions. There is a risk that you could achieve better returns by investing in an individual fund or funds representing a single broad asset class rather than investing in a fund of funds. The Fund’s performance is also closely related to the Portfolio Optimization Underlying Funds performance and ability to meet their investment goals. Fund shareholders bear indirectly the expenses of the Portfolio Optimization Underlying Funds in which the Fund invests in addition to the Fund’s management fee so there is a risk of an additional layer or layers of fees. The Fund’s actual asset class allocations may deviate from the intended allocation because a Portfolio Optimization Underlying Fund’s investments can change due to market movements, the Portfolio Optimization Underlying Fund Manager’s investment decisions or other factors, which could result in the fund’s risk/return target not being met. As a fund of funds, the Fund is exposed to the same risks as the Portfolio Optimization Underlying Funds in proportion to the Fund’s allocation to those Portfolio Optimization Underlying Funds.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Securities Lending Risk: A Portfolio Optimization Underlying Fund may engage in securities lending, which involves the risk that a Portfolio Optimization Underlying Fund may suffer a loss if the borrower fails to return the loaned securities in a timely manner or at all. A Portfolio Optimization Underlying 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.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Swap Agreements Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Swap Agreements Risk: Swap agreements are derivative contracts where the parties agree to exchange the returns earned on specific assets, such as the return on, or increase in value of, an amount invested in a particular “basket” of securities representing a certain index. As a derivative, it is subject to derivatives risk, including counterparty risk. Although certain standard swap agreements are centrally cleared through an exchange, which is expected to decrease counterparty risk and increase liquidity compared to swaps that are privately negotiated, central clearing does not eliminate these risks. In addition, a Portfolio Optimization Underlying Fund’s use of total return swap agreements is subject to market risks based upon changes in the value of the underlying index or reference instrument.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Derivatives Risk: The use of forward commitments, futures contracts, options or swap agreements (each a type of derivative instrument) as a principal investment strategy subjects a Portfolio Optimization Underlying Fund to a number of risks, including: counterparty risk, leverage risk, market risk, regulatory risk, liquidity and valuation risk, operational risk, correlation risk, legal risk and premium risk. Derivatives may be riskier than other types of investments and may increase the Portfolio Optimization Underlying Fund’s volatility and risk of loss.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Leverage Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Leverage Risk: A Portfolio Optimization Underlying Fund may invest in forward commitments, futures contracts, options or swap agreements, including taking short positions using certain derivatives, as a principal investment strategy. These derivative investments give rise to a form of leverage. Leverage is investment exposure that exceeds the initial amount invested. The loss on a leveraged investment may far exceed a Portfolio Optimization Underlying Fund’s principal amount invested. Leverage can magnify a Portfolio Optimization Underlying Fund’s gains and losses and therefore increase its volatility.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce a Portfolio
Optimization Underlying Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, a Portfolio Optimization Underlying Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, a Portfolio Optimization Underlying Fund’s yield (and total return) also may be low and a Portfolio Optimization Underlying Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Financial Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Active Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 a Portfolio Optimization Underlying Fund’s performance.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Underlying Fund Risk: Because a Portfolio Optimization Underlying 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 Portfolio Optimization Underlying Fund, causing the sale of securities in a short timeframe and potential increases in expenses to the Portfolio Optimization Underlying Fund and its remaining shareholders, both of which could negatively impact performance.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | High Yield/High Risk or “Junk” Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
High Yield/High Risk or “Junk” Securities Risk: High yield/​high risk securities are typically issued by companies that are highly leveraged, less creditworthy or financially distressed and are considered to be mostly speculative in nature (high risk), subject to greater liquidity risk, and subject to a greater risk of default than higher rated securities. High yield/high risk securities may be more volatile than investment grade securities.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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. A Portfolio Optimization Underlying 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.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Emerging Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Emerging Markets Risk: Investments in or exposure to investments in emerging market countries may be riskier than investments in or exposure to investments in U.S. and other developed markets for many reasons, including smaller market capitalizations, greater price volatility, less liquidity, lower credit quality, a higher degree of political and economic instability, the impact of economic sanctions, less governmental regulation and supervision of the financial industry and markets, and less stringent financial reporting and accounting standards and controls.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of a Portfolio Optimization Underlying Fund’s investments denominated in or with exposure to that foreign currency.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Conflicts of Interest Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Conflicts of Interest Risk: PLFA is subject to competing interests that have the potential to influence its investment decisions for the Fund. For example, a Portfolio Optimization Underlying Fund that provides greater profitability to PLFA than another Portfolio Optimization Underlying Fund may create an incentive for PLFA to use that fund as a Portfolio Optimization Underlying Fund. In addition, PLFA may be influenced by its view of the best interests of Portfolio Optimization Underlying Funds, such as a view that a Portfolio Optimization Underlying Fund may benefit from additional assets or could be harmed by redemptions. In addition, PLFA’s management of the Fund and the Fund’s risk/return profile may be influenced by the insurance companies that use the Fund as an investment option for their variable life and annuity contracts. These insurance companies may include affiliates of PLFA. PLFA seeks to identify and address any potential conflicts in a manner that is fair for Portfolio Optimization Underlying Funds, the Fund and the shareholders of the Fund and Portfolio Optimization Underlying Fund. PLFA has adopted a policy under which investment decisions for the Fund must be made in the best interests of the Fund
and its shareholders, and PLFA may take into account the interests of a Portfolio Optimization Underlying Fund and its shareholders when making investment decisions for the Fund.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Geographic Focus Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Geographic Focus Risk: If a Portfolio Optimization Underlying Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic,
political, social, or other conditions in those countries or that region will have a significant impact on the Portfolio Optimization Underlying Fund’s performance. As a result, the Portfolio Optimization Underlying Fund’s performance may be more volatile than the performance of more geographically diversified funds.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Technology Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Technology Sector Risk: Companies in the Technology sector face a number of risks, including operating in rapidly changing fields, abrupt or erratic market movements, limited product lines, markets or financial resources, management that is dependent on a limited number of people, short product cycles, aggressive pricing of products and services, new market entrants and rapid obsolescence of products and services due to technological innovations or changing consumer preferences. In addition, many U.S. companies in the Technology sector have diverse operations, with products or services in foreign markets, exposing them to risks associated with foreign markets.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Consumer Non-Cyclical Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Consumer Non-Cyclical Sector Risk: Companies in the Consumer Non-cyclical products and services sector (which are generally considered essential staples) may be adversely impacted by changes in domestic and global economic conditions, consumer confidence and preferences, disposable household income and consumer spending, product cycles, marketing, demographics, production spending, competition, government regulations and factors impacting the supply, demand and prices of raw materials.
Portfolio Optimization Aggressive-Growth Portfolio | Portfolio Optimization Aggressive-Growth Portfolio | Asset Allocation Fund Of Funds Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Asset Allocation Fund of Funds Risk: Asset allocation decisions, techniques, analyses, or models implemented by PLFA as the Fund’s investment adviser may not produce the expected returns, may cause the Fund’s shares to lose value or may cause the Fund to underperform other funds with similar investment goals. Although the theory behind asset allocation is that diversification among asset classes can help reduce volatility over the long term, PLFA’s assumptions about asset classes and Portfolio Optimization Underlying Funds may diverge from historical performance and assumptions used to develop allocations in light of actual market conditions. There is a risk that you could achieve better returns by investing in an individual fund or funds representing a single broad asset class rather than investing in a fund of funds. The Fund’s performance is also closely related to the Portfolio Optimization Underlying Funds performance and ability to meet their investment goals. Fund shareholders bear indirectly the expenses of the Portfolio Optimization Underlying Funds in which the Fund invests in addition to the Fund’s management fee so there is a risk of an additional layer or layers of fees. The Fund’s actual asset class allocations may deviate from the intended allocation because a Portfolio Optimization Underlying Fund’s investments can change due to market movements, the Portfolio Optimization Underlying Fund Manager’s investment decisions or other factors, which could result in the fund’s risk/return target not being met. As a fund of funds, the Fund is exposed to the same risks as the Portfolio Optimization Underlying Funds in proportion to the Fund’s allocation to those Portfolio Optimization Underlying Funds.
PD 1-3 Year Corporate Bond Portfolio | PD 1-3 Year Corporate Bond Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
PD 1-3 Year Corporate Bond Portfolio | PD 1-3 Year Corporate Bond Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
PD 1-3 Year Corporate Bond Portfolio | PD 1-3 Year Corporate Bond Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.
PD 1-3 Year Corporate Bond Portfolio | PD 1-3 Year Corporate Bond Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD 1-3 Year Corporate Bond Portfolio | PD 1-3 Year Corporate Bond Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
PD 1-3 Year Corporate Bond Portfolio | PD 1-3 Year Corporate Bond Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce the Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
PD 1-3 Year Corporate Bond Portfolio | PD 1-3 Year Corporate Bond Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, the Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, the Fund’s yield (and total return) also may be low and the Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
PD 1-3 Year Corporate Bond Portfolio | PD 1-3 Year Corporate Bond Portfolio | Financial Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD 1-3 Year Corporate Bond Portfolio | PD 1-3 Year Corporate Bond Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Underlying Fund Risk: Because the Fund is available for investment by the Pacific Dynamix Portfolios and thus may have a significant percentage of its outstanding shares held by the Pacific Dynamix Portfolios, a change in asset allocation by the Pacific Dynamix Portfolios 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.
PD 1-3 Year Corporate Bond Portfolio | PD 1-3 Year Corporate Bond Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD 1-3 Year Corporate Bond Portfolio | PD 1-3 Year Corporate Bond Portfolio | Tracking Error Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD 1-3 Year Corporate Bond Portfolio | PD 1-3 Year Corporate Bond Portfolio | Industry Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD 1-3 Year Corporate Bond Portfolio | PD 1-3 Year Corporate Bond Portfolio | Passive Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD 1-3 Year Corporate Bond Portfolio | PD 1-3 Year Corporate Bond Portfolio | Index Sampling Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 a Fund seeks corresponding investment results, as opposed to holding the constituent securities of that index in the same proportion as the index 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.
PD Aggregate Bond Index Portfolio | PD Aggregate Bond Index Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
PD Aggregate Bond Index Portfolio | PD Aggregate Bond Index Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
PD Aggregate Bond Index Portfolio | PD Aggregate Bond Index Portfolio | Mortgage-Related and Other Asset-Backed Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related and other asset-backed securities are subject to certain risks affecting the housing market or the market for the assets underlying such securities. These securities are also subject to extension risk (the risk that rising interest rates extend the duration of fixed mortgage-related and other asset-backed securities, making them more sensitive to changes in interest rates), interest rate risk (the risk that rising interest rates will cause a decline in the value of a fixed income security), subprime risk (the risk that these securities have exposure to borrowers with lower credit risk, increasing potential default), prepayment risk (when interest rates decline, borrowers may pay off their mortgages sooner than expected which can reduce the Fund’s returns because the Fund may have to reinvest its assets at lower interest rates), call risk (similar to prepayment risk, an issuer may pay its obligations under a security sooner than expected), U.S. government securities risk (securities backed by different U.S. government agencies are subject to varying levels of credit rating risk) and issuer risk (the risk that a private issuer cannot meet its obligations).
PD Aggregate Bond Index Portfolio | PD Aggregate Bond Index Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Aggregate Bond Index Portfolio | PD Aggregate Bond Index Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
PD Aggregate Bond Index Portfolio | PD Aggregate Bond Index Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce the Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
PD Aggregate Bond Index Portfolio | PD Aggregate Bond Index Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, the Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, the Fund’s yield (and total return) also may be low and the Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
PD Aggregate Bond Index Portfolio | PD Aggregate Bond Index Portfolio | U.S. Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.
PD Aggregate Bond Index Portfolio | PD Aggregate Bond Index Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Underlying Fund Risk: Because the Fund is available for investment by the Pacific Dynamix Portfolios and thus may have a significant percentage of its outstanding shares held by the Pacific Dynamix Portfolios, a change in asset allocation by the Pacific Dynamix Portfolios 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.
PD Aggregate Bond Index Portfolio | PD Aggregate Bond Index Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Aggregate Bond Index Portfolio | PD Aggregate Bond Index Portfolio | Tracking Error Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Aggregate Bond Index Portfolio | PD Aggregate Bond Index Portfolio | Industry Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Aggregate Bond Index Portfolio | PD Aggregate Bond Index Portfolio | Passive Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Aggregate Bond Index Portfolio | PD Aggregate Bond Index Portfolio | Index Sampling Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 a Fund seeks corresponding investment results, as opposed to holding the constituent securities of that index in the same proportion as the index 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.
PD High Yield Bond Market Portfolio | PD High Yield Bond Market Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
PD High Yield Bond Market Portfolio | PD High Yield Bond Market Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
PD High Yield Bond Market Portfolio | PD High Yield Bond Market Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD High Yield Bond Market Portfolio | PD High Yield Bond Market Portfolio | Debt Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.
PD High Yield Bond Market Portfolio | PD High Yield Bond Market Portfolio | Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due (“default”). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce the Fund’s income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.
PD High Yield Bond Market Portfolio | PD High Yield Bond Market Portfolio | Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. During periods when the Federal Reserve raises interest rates, the Fund may be subject to heightened levels of interest rate risk. During periods when interest rates are low or there are negative interest rates, the Fund’s yield (and total return) also may be low and the Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.
PD High Yield Bond Market Portfolio | PD High Yield Bond Market Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Underlying Fund Risk: Because the Fund is available for investment by the Pacific Dynamix Portfolios and thus may have a significant percentage of its outstanding shares held by the Pacific Dynamix Portfolios, a change in asset allocation by the Pacific Dynamix Portfolios 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.
PD High Yield Bond Market Portfolio | PD High Yield Bond Market Portfolio | High Yield/High Risk or “Junk” Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
High Yield/High Risk or “Junk” Securities Risk: High yield/​high risk securities are typically issued by companies that are highly leveraged, less creditworthy or financially distressed and are considered to be mostly speculative in nature (high
risk), subject to greater liquidity risk, and subject to a greater risk of default than higher rated securities. High yield/high risk securities may be more volatile than investment grade securities.
PD High Yield Bond Market Portfolio | PD High Yield Bond Market Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD High Yield Bond Market Portfolio | PD High Yield Bond Market Portfolio | Tracking Error Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD High Yield Bond Market Portfolio | PD High Yield Bond Market Portfolio | Industry Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD High Yield Bond Market Portfolio | PD High Yield Bond Market Portfolio | Passive Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD High Yield Bond Market Portfolio | PD High Yield Bond Market Portfolio | Index Sampling Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 a Fund seeks corresponding investment results, as opposed to holding the constituent securities of that index in the same proportion as the index 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.
PD Large-Cap Growth Index Portfolio | PD Large-Cap Growth Index Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
PD Large-Cap Growth Index Portfolio | PD Large-Cap Growth Index Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
PD Large-Cap Growth Index Portfolio | PD Large-Cap Growth Index Portfolio | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Large-Cap Growth Index Portfolio | PD Large-Cap Growth Index Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Large-Cap Growth Index Portfolio | PD Large-Cap Growth Index Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Underlying Fund Risk: Because the Fund is available for investment by the Pacific Dynamix Portfolios and thus may have a significant percentage of its outstanding shares held by the Pacific Dynamix Portfolios, a change in asset allocation by the Pacific Dynamix Portfolios 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.
PD Large-Cap Growth Index Portfolio | PD Large-Cap Growth Index Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
PD Large-Cap Growth Index Portfolio | PD Large-Cap Growth Index Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Large-Cap Growth Index Portfolio | PD Large-Cap Growth Index Portfolio | Tracking Error Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Large-Cap Growth Index Portfolio | PD Large-Cap Growth Index Portfolio | Industry Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Large-Cap Growth Index Portfolio | PD Large-Cap Growth Index Portfolio | Passive Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Large-Cap Growth Index Portfolio | PD Large-Cap Growth Index Portfolio | Technology Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Technology Sector Risk: Companies in the Technology sector face a number of risks, including operating in rapidly changing fields, abrupt or erratic market movements, limited product lines, markets or financial resources, management that is dependent on a limited number of people, short product cycles, aggressive pricing of products and services, new market entrants and rapid obsolescence of products and services due to technological innovations or changing consumer preferences. In addition, many U.S. companies in the Technology sector have diverse operations, with products or services in foreign markets, exposing them to risks associated with foreign markets.
PD Large-Cap Growth Index Portfolio | PD Large-Cap Growth Index Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
PD Large-Cap Value Index Portfolio | PD Large-Cap Value Index Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
PD Large-Cap Value Index Portfolio | PD Large-Cap Value Index Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
PD Large-Cap Value Index Portfolio | PD Large-Cap Value Index Portfolio | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Large-Cap Value Index Portfolio | PD Large-Cap Value Index Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Large-Cap Value Index Portfolio | PD Large-Cap Value Index Portfolio | Financial Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Large-Cap Value Index Portfolio | PD Large-Cap Value Index Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Underlying Fund Risk: Because the Fund is available for investment by the Pacific Dynamix Portfolios and thus may have a significant percentage of its outstanding shares held by the Pacific Dynamix Portfolios, a change in asset allocation by the Pacific Dynamix Portfolios 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.
PD Large-Cap Value Index Portfolio | PD Large-Cap Value Index Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
PD Large-Cap Value Index Portfolio | PD Large-Cap Value Index Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Large-Cap Value Index Portfolio | PD Large-Cap Value Index Portfolio | Tracking Error Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Large-Cap Value Index Portfolio | PD Large-Cap Value Index Portfolio | Industry Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Large-Cap Value Index Portfolio | PD Large-Cap Value Index Portfolio | Passive Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Large-Cap Value Index Portfolio | PD Large-Cap Value Index Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Mid-Cap Index Portfolio | PD Mid-Cap Index Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
PD Mid-Cap Index Portfolio | PD Mid-Cap Index Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
PD Mid-Cap Index Portfolio | PD Mid-Cap Index Portfolio | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Mid-Cap Index Portfolio | PD Mid-Cap Index Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Mid-Cap Index Portfolio | PD Mid-Cap Index Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Underlying Fund Risk: Because the Fund is available for investment by the Pacific Dynamix Portfolios and thus may have a significant percentage of its outstanding shares held by the Pacific Dynamix Portfolios, a change in asset allocation by the Pacific Dynamix Portfolios 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.
PD Mid-Cap Index Portfolio | PD Mid-Cap Index Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
PD Mid-Cap Index Portfolio | PD Mid-Cap Index Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Mid-Cap Index Portfolio | PD Mid-Cap Index Portfolio | Tracking Error Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Mid-Cap Index Portfolio | PD Mid-Cap Index Portfolio | Industry Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Mid-Cap Index Portfolio | PD Mid-Cap Index Portfolio | Passive Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Mid-Cap Index Portfolio | PD Mid-Cap Index Portfolio | Index Sampling Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 a 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.
PD Small-Cap Growth Index Portfolio | PD Small-Cap Growth Index Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
PD Small-Cap Growth Index Portfolio | PD Small-Cap Growth Index Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
PD Small-Cap Growth Index Portfolio | PD Small-Cap Growth Index Portfolio | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Small-Cap Growth Index Portfolio | PD Small-Cap Growth Index Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Small-Cap Growth Index Portfolio | PD Small-Cap Growth Index Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Underlying Fund Risk: Because the Fund is available for investment by the Pacific Dynamix Portfolios and thus may have a significant percentage of its outstanding shares held by the Pacific Dynamix Portfolios, a change in asset allocation by the Pacific Dynamix Portfolios 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.
PD Small-Cap Growth Index Portfolio | PD Small-Cap Growth Index Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Small-Cap Growth Index Portfolio | PD Small-Cap Growth Index Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
PD Small-Cap Growth Index Portfolio | PD Small-Cap Growth Index Portfolio | Tracking Error Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Small-Cap Growth Index Portfolio | PD Small-Cap Growth Index Portfolio | Industry Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Small-Cap Growth Index Portfolio | PD Small-Cap Growth Index Portfolio | Passive Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Small-Cap Growth Index Portfolio | PD Small-Cap Growth Index Portfolio | Growth Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Growth Companies Risk: Growth companies are those that a portfolio manager believes have the potential for above average or rapid growth but may be subject to greater price volatility than investments in “undervalued” companies.
PD Small-Cap Growth Index Portfolio | PD Small-Cap Growth Index Portfolio | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Small-Cap Growth Index Portfolio | PD Small-Cap Growth Index Portfolio | Index Sampling Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 a 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.
PD Small-Cap Growth Index Portfolio | PD Small-Cap Growth Index Portfolio | Consumer Non-Cyclical Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Consumer Non-Cyclical Sector Risk: Companies in the Consumer Non-cyclical products and services sector (which are generally considered essential staples) may be adversely impacted by changes in domestic and global economic conditions, consumer confidence and preferences, disposable household income and consumer spending, product cycles, marketing, demographics, production spending, competition, government regulations and factors impacting the supply, demand and prices of raw materials.
PD Small-Cap Value Index Portfolio | PD Small-Cap Value Index Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
PD Small-Cap Value Index Portfolio | PD Small-Cap Value Index Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
PD Small-Cap Value Index Portfolio | PD Small-Cap Value Index Portfolio | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Small-Cap Value Index Portfolio | PD Small-Cap Value Index Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Small-Cap Value Index Portfolio | PD Small-Cap Value Index Portfolio | Financial Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Small-Cap Value Index Portfolio | PD Small-Cap Value Index Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Underlying Fund Risk: Because the Fund is available for investment by the Pacific Dynamix Portfolios and thus may have a significant percentage of its outstanding shares held by the Pacific Dynamix Portfolios, a change in asset allocation by the Pacific Dynamix Portfolios 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.
PD Small-Cap Value Index Portfolio | PD Small-Cap Value Index Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Small-Cap Value Index Portfolio | PD Small-Cap Value Index Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
PD Small-Cap Value Index Portfolio | PD Small-Cap Value Index Portfolio | Tracking Error Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Small-Cap Value Index Portfolio | PD Small-Cap Value Index Portfolio | Industry Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Small-Cap Value Index Portfolio | PD Small-Cap Value Index Portfolio | Passive Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Small-Cap Value Index Portfolio | PD Small-Cap Value Index Portfolio | Small-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Small-Cap Value Index Portfolio | PD Small-Cap Value Index Portfolio | Value Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Small-Cap Value Index Portfolio | PD Small-Cap Value Index Portfolio | Index Sampling Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 a 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.
PD Emerging Markets Index Portfolio | PD Emerging Markets Index Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
PD Emerging Markets Index Portfolio | PD Emerging Markets Index Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
PD Emerging Markets Index Portfolio | PD Emerging Markets Index Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region. Depositary receipts are also subject to these risks.
PD Emerging Markets Index Portfolio | PD Emerging Markets Index Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Emerging Markets Index Portfolio | PD Emerging Markets Index Portfolio | Financial Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Emerging Markets Index Portfolio | PD Emerging Markets Index Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Underlying Fund Risk: Because the Fund is available for investment by the Pacific Dynamix Portfolios and thus may have a significant percentage of its outstanding shares held by the Pacific Dynamix Portfolios, a change in asset
allocation by the Pacific Dynamix Portfolios 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.
PD Emerging Markets Index Portfolio | PD Emerging Markets Index Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Emerging Markets Index Portfolio | PD Emerging Markets Index Portfolio | Emerging Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Emerging Markets Risk: Investments in or exposure to investments in emerging market countries may be riskier than investments in or exposure to investments in U.S. and other developed markets for many reasons, including smaller market capitalizations, greater price volatility, less liquidity, lower credit quality, a higher degree of political and economic instability, the impact of economic sanctions, less governmental regulation and supervision of the financial industry and markets, and less stringent financial reporting and accounting standards and controls.
PD Emerging Markets Index Portfolio | PD Emerging Markets Index Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of the Fund’s investments denominated in or with exposure to that foreign currency.
PD Emerging Markets Index Portfolio | PD Emerging Markets Index Portfolio | Geographic Focus Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Geographic Focus Risk: If the Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic, political, social, or other conditions in those countries or that region will have a significant impact on the Fund’s performance. As a result, the Fund’s performance may be more volatile than the performance of more geographically diversified funds.
PD Emerging Markets Index Portfolio | PD Emerging Markets Index Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
PD Emerging Markets Index Portfolio | PD Emerging Markets Index Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Emerging Markets Index Portfolio | PD Emerging Markets Index Portfolio | Mid-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Emerging Markets Index Portfolio | PD Emerging Markets Index Portfolio | Tracking Error Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Emerging Markets Index Portfolio | PD Emerging Markets Index Portfolio | Industry Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Emerging Markets Index Portfolio | PD Emerging Markets Index Portfolio | Passive Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD Emerging Markets Index Portfolio | PD Emerging Markets Index Portfolio | Index Sampling Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 a 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.
PD Emerging Markets Index Portfolio | PD Emerging Markets Index Portfolio | China Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
China Risk: Because the Fund has principal exposure to investments (both directly and indirectly) involving China, the Fund may be impacted by social, economic and political conditions impacting China, including international relations with other nations, public health risks, corruption and military activity, market illiquidity, exchange-rate fluctuations, volatility, and the potential for limited disclosure and regulation involving Chinese securities.
PD International Large-Cap Index Portfolio | PD International Large-Cap Index Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
PD International Large-Cap Index Portfolio | PD International Large-Cap Index Portfolio | Risk Not Insured [Member]  
Prospectus [Line Items]  
Risk [Text Block] 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.
PD International Large-Cap Index Portfolio | PD International Large-Cap Index Portfolio | Foreign (Non-U.S.) Markets Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in United States (“U.S.”) issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region. Depositary receipts are also subject to these risks.
PD International Large-Cap Index Portfolio | PD International Large-Cap Index Portfolio | Securities Lending Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD International Large-Cap Index Portfolio | PD International Large-Cap Index Portfolio | Financial Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD International Large-Cap Index Portfolio | PD International Large-Cap Index Portfolio | Underlying Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Underlying Fund Risk: Because the Fund is available for investment by the Pacific Dynamix Portfolios and thus may have a significant percentage of its outstanding shares held by the Pacific Dynamix Portfolios, a change in asset allocation by the Pacific Dynamix Portfolios 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.
PD International Large-Cap Index Portfolio | PD International Large-Cap Index Portfolio | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD International Large-Cap Index Portfolio | PD International Large-Cap Index Portfolio | Currency Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Currency Risk: A decline in the value of a foreign (non-U.S.) currency relative to the U.S. dollar reduces the value in U.S. dollars of the Fund’s investments denominated in or with exposure to that foreign currency.
PD International Large-Cap Index Portfolio | PD International Large-Cap Index Portfolio | Geographic Focus Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Geographic Focus Risk: If the Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic, political, social, or other conditions in those countries or that region will have a significant impact on the Fund’s performance. As a result, the Fund’s performance may be more volatile than the performance of more geographically diversified funds.
PD International Large-Cap Index Portfolio | PD International Large-Cap Index Portfolio | Equity Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Equity Securities Risk: Equity securities tend to go up and down in value, sometimes rapidly and unpredictably.
PD International Large-Cap Index Portfolio | PD International Large-Cap Index Portfolio | Large-Capitalization Companies Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD International Large-Cap Index Portfolio | PD International Large-Cap Index Portfolio | Tracking Error Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD International Large-Cap Index Portfolio | PD International Large-Cap Index Portfolio | Industry Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD International Large-Cap Index Portfolio | PD International Large-Cap Index Portfolio | Passive Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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.
PD International Large-Cap Index Portfolio | PD International Large-Cap Index Portfolio | Index Sampling Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
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 a 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.