| Label |
Element |
Value |
| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
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The Institutional U.S. Equity Portfolio
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| Objective [Heading] |
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Investment Objective
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| Objective, Primary [Text Block] |
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The investment objective of The Institutional U.S. Equity Portfolio is to provide capital appreciation,
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| Objective, Secondary [Text Block] |
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with income as a secondary consideration.
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| Expense Heading [Optional Text] |
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Fees and Expenses
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| Expense Narrative [Text Block] |
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The fee and expense tables below describe the fees and expenses that you may pay if you buy and hold shares of the Portfolio.
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| Shareholder Fees Caption [Optional Text] |
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Shareholder Fees (fees paid directly from your investment)
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| Operating Expenses Caption [Optional Text] |
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Annual Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
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| Expenses Restated to Reflect Current [Text] |
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Total Annual Fund Operating Expenses have been restated to reflect current expenses as of June 30, 2026.
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| Expense Example [Heading] |
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Example:
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| Expense Example Narrative [Text Block] |
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This Example is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Portfolio’s Total Annual Operating Expenses remain the same. Although your actual cost may be higher or lower, based on these assumptions, your cost would be:
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| Portfolio Turnover [Heading] |
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Portfolio Turnover
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| Portfolio Turnover [Text Block] |
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The Portfolio pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” investments in its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These costs, which are not reflected in the Total Annual Operating Expenses or in the Example, affect the Portfolio’s performance. During the most recent fiscal year, the Portfolio’s turnover was 42% of the average value of its portfolio.
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| Portfolio Turnover, Rate |
oef_PortfolioTurnoverRate |
42.00%
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| Strategy [Heading] |
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Principal Investment Strategies
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| Strategy Narrative [Text Block] |
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The Portfolio is a diversified investment company that is designed to provide broad exposure to the U.S. equity market. Under normal circumstances, the Portfolio seeks to achieve its objective by investing primarily (i.e., at least 80% of its net assets) in U.S. equity securities. In the unlikely event that a change in this investment policy is adopted by the Board of Trustees, shareholders will receive at least 60 days prior written notice before such change is implemented. The Portfolio will invest in equity securities of issuers of any capitalization. The Portfolio will also invest in equity and debt securities issued by U.S. and non-U.S. real estate-related companies. Companies known as real estate investment trusts (“REITs”) and other real estate operating companies whose value is derived from ownership, development and management of underlying real estate properties are considered to be real estate-related companies. With respect to such real estate-related investments, the Portfolio’s permissible investments include equity and equity-related securities of real estate-related companies, including common stock, preferred stock, convertible securities, warrants, options, depositary receipts and other similar equity equivalents. The Portfolio may invest up to 20% of the total assets of the actively managed portion of the Portfolio in income-producing securities other than common stock, such as bonds, including those that are convertible into common stock, and other fixed income securities, including mortgage-backed securities and high yield debt (“junk bonds”). These income-producing securities may be of any quality or maturity. Up to 20% of the total assets of the total Portfolio may also be invested in securities issued by non-U.S. companies. The Portfolio may invest in securities issued by other investment companies, including ETFs, that invest in equity securities. Although some of the equity securities in which the Portfolio will invest are expected to be dividend paying issues, income is a secondary consideration in the stock selection process. The Portfolio may be managed using an “active” investment approach and/or a “passive” investment approach designed to approximate as closely as practicable, before expenses, the performance of either the Portfolio’s benchmark index or, from time to time, one or more identifiable subsets or other portions of that index. The relative weighting of these two approaches may vary anywhere from 0% to 100% of the Portfolio’s assets at any given time.
The Portfolio is authorized to operate on a multi-manager basis. This means that a single Portfolio may be managed by more than one Specialist Manager. The multi-manager structure is generally designed to provide investors access to broadly diversified investment styles. The Trust seeks to engage skilled Specialist Managers to provide a broad exposure to the relevant asset class and returns in excess of the Portfolio’s benchmark over time.
Consistent with their respective investment styles, the Portfolio’s Specialist Managers may use option or futures contracts in order to hedge against investment risks, seek to efficiently obtain or adjust exposure to certain securities or groups of securities, or otherwise to increase returns. The Portfolio may also write (sell) call options and put options, in order to receive premiums, on individual securities, U.S. stock market indexes, and/or on substitutes for such indexes, which may include futures contracts or ETFs. The Portfolio normally writes covered call and put options which have an initial maturity of up to nine months and that are “out of the money” at the time of initiation such that the call options sold generally will be above the current price level of the index when written and the exercise price of put options sold generally will be below the current price level of the index when written. The Portfolio’s Specialist Managers may also use swaps. In accordance with applicable interpretations of the SEC, certain derivative instruments may be counted as equity securities for purposes of the Portfolio’s policies regarding investments in equity securities, to the extent that such derivative instruments have economic characteristics similar to those of equity securities.
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| Summary of Definition of Rule 35d-1 Term in Fund Name [Text Block] |
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The Portfolio will invest in equity securities of issuers of any capitalization. The Portfolio will also invest in equity and debt securities issued by U.S. and non-U.S. real estate-related companies. Companies known as real estate investment trusts (“REITs”) and other real estate operating companies whose value is derived from ownership, development and management of underlying real estate properties are considered to be real estate-related companies. With respect to such real estate-related investments, the Portfolio’s permissible investments include equity and equity-related securities of real estate-related companies, including common stock, preferred stock, convertible securities, warrants, options, depositary receipts and other similar equity equivalents. The Portfolio may invest up to 20% of the total assets of the actively managed portion of the Portfolio in income-producing securities other than common stock, such as bonds, including those that are convertible into common stock, and other fixed income securities, including mortgage-backed securities and high yield debt (“junk bonds”). These income-producing securities may be of any quality or maturity. Up to 20% of the total assets of the total Portfolio may also be invested in securities issued by non-U.S. companies. The Portfolio may invest in securities issued by other investment companies, including ETFs, that invest in equity securities. Although some of the equity securities in which the Portfolio will invest are expected to be dividend paying issues, income is a secondary consideration in the stock selection process.
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| Summary of Selection Criteria for Rule 35d-1 Term in Fund Name [Text Block] |
fnd_NmRule35d1TermSlctnCritSmryTextBlock |
The Portfolio may be managed using an “active” investment approach and/or a “passive” investment approach designed to approximate as closely as practicable, before expenses, the performance of either the Portfolio’s benchmark index or, from time to time, one or more identifiable subsets or other portions of that index. The relative weighting of these two approaches may vary anywhere from 0% to 100% of the Portfolio’s assets at any given time.
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| Rule 35d-1 Eighty Percent Investment Policy [Text Block] |
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Under normal circumstances, the Portfolio seeks to achieve its objective by investing primarily (i.e., at least 80% of its net assets) in U.S. equity securities.
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| Bar Chart and Performance Table [Heading] |
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Performance Bar Chart and Table
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| Performance Narrative [Text Block] |
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Performance. The chart and table below show how The Institutional U.S. Equity Portfolio has performed, and how its performance has varied, from year to year. The bar chart shows returns on a before-tax basis and gives some indication of risk by showing changes in the Portfolio’s yearly performance for each of the last ten full calendar years. The table accompanying the bar chart compares the Portfolio’s performance over time on a before and after-tax basis to that of a broad based market index. Of course, past performance, before and after taxes, does not indicate how the Portfolio will perform in the future.
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| Performance Information Illustrates Variability of Returns [Text] |
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The chart and table below show how The Institutional U.S. Equity Portfolio has performed, and how its performance has varied, from year to year. The bar chart shows returns on a before-tax basis and gives some indication of risk by showing changes in the Portfolio’s yearly performance for each of the last ten full calendar years.
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| Performance Past Does Not Indicate Future [Text] |
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Of course, past performance, before and after taxes, does not indicate how the Portfolio will perform in the future.
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| Bar Chart [Heading] |
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Year-by-Year Total Returns as of 12/31*
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| Bar Chart Footnotes [Text Block] |
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* Results shown on a calendar year basis; the Portfolio’s fiscal year, however, is June 30. |
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| Bar Chart Closing [Text Block] |
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The Portfolio’s before-tax return for the period from January 1, 2026 through September 30, 2026 (non-annualized) was 8.95%.
| Best quarter:
| | 2nd Qtr. 2020
| 24.10%
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| Worst quarter:
| | 1st Qtr. 2020
| -17.84%
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| Year to Date Return, Label [Optional Text] |
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before-tax return
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| Bar Chart, Year to Date Return, Date |
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Sep. 30, 2026
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| Bar Chart, Year to Date Return |
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8.95%
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| Highest Quarterly Return, Label [Optional Text] |
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Best quarter:
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| Highest Quarterly Return, Date |
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Jun. 30, 2020
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| Highest Quarterly Return |
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24.10%
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| Lowest Quarterly Return, Label [Optional Text] |
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Worst quarter:
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| Lowest Quarterly Return, Date |
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Mar. 31, 2020
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| Lowest Quarterly Return |
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(17.84%)
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| Performance Table Heading |
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Average Annual Total Returns (for the periods ended 12/31/25)
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| Index No Deduction for Fees, Expenses, or Taxes [Text] |
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(reflects no deduction for fees, expenses or taxes)
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| Performance Table Uses Highest Federal Rate |
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After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes.
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| Performance Table Not Relevant to Tax Deferred |
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Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold Portfolio shares through tax-advantaged arrangements, such as qualified retirement plans.
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| Performance Table Closing [Text Block] |
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After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold Portfolio shares through tax-advantaged arrangements, such as qualified retirement plans.
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Risk Lose Money [Member] |
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| Prospectus [Line Items] |
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| Risk [Text Block] |
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There is no guarantee that the Portfolio will achieve its investment objective and, as is the case with any investment, you may lose money on your investment in the Portfolio.
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Multi-Manager Risk [Member] |
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| Prospectus [Line Items] |
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| Risk [Text Block] |
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• | Multi-Manager Risk – the Portfolio’s multi-manager structure involves the risk that the Specialist Managers serving the Portfolio do not achieve favorable investment results relative to other investments or that the Portfolio’s assets are not effectively allocated among Specialist Managers in a manner that enhances the Portfolio’s total return or reduces the volatility that might be expected of any one management style. Additionally, the multi-manager structure may, under certain circumstances, cause the Portfolio to incur higher trading costs than might occur in a fund served by a single investment adviser. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Passive Investing Risk [Member] |
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| Prospectus [Line Items] |
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| Risk [Text Block] |
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• | Passive Investing Risk – the Portfolio may employ a passive investment approach, which attempts to approximate as closely as practicable, before expenses, the performance of either the Portfolio’s benchmark index, or one or more identifiable subsets or other portions of that index as deemed appropriate by the Adviser, regardless of the current or projected performance of a specific security or a particular industry or market sector. Maintaining investments in securities regardless of market conditions or the performance of individual securities could cause the Portfolio’s return to be lower than if the Portfolio employed an active strategy. In addition, the Portfolio’s return may not match or achieve a high degree of correlation with the return of the target investment pool due to operating expenses, transaction costs, and cash flows. |
Additionally, the range of securities in which the Portfolio may invest, and the several investment strategies that may be used in seeking to achieve the Portfolio’s objective, involve additional risks. These are summarized below.
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Equity Risks [Member] |
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| Risk [Text Block] |
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• | Equity Risks. Investment in equity securities involves the following risks: |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Equity Market Risk [Member] |
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| Risk [Text Block] |
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• | Equity Market Risk – The market value of an equity security and the equity markets in general can be volatile. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Small/Mid Cap Risk [Member] |
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| Risk [Text Block] |
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• | Small/Mid Cap Risk – Small and mid-capitalization companies may be more vulnerable to adverse business or economic developments than larger capitalization companies. Securities issued by these companies may be less liquid and/or more volatile than securities of larger companies or the overall securities markets. Small and mid-cap companies may be adversely affected during periods when investors prefer to hold securities of large capitalization companies. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Sector Emphasis Risk [Member] |
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| Risk [Text Block] |
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• | Sector Emphasis Risk – Sector risk is the possibility that a certain sector may perform differently than other sectors or as the market as a whole. Although the Portfolio will not concentrate its investments (i.e. invest more than 25% of the value of its total assets) in securities of issuers in any industry or group of industries, the Portfolio may emphasize investments in one or more sectors. At times when the Portfolio emphasizes a particular sector, the value of its net assets will be more susceptible to the financial, market or economic events affecting that sector than would be the case for funds that do not emphasize investment in a particular sector. This may increase the risk of loss associated with an investment in the Portfolio. As of the date of this Prospectus, the Portfolio currently invests a significant portion of its assets in companies in the information technology sector, and therefore the performance of the Portfolio could be negatively impacted by events affecting this sector. Companies in the information technology sector are subject to rapid changes in technology product cycles, rapid product obsolescence, government regulation, and increased competition. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Investment in Other Investment Companies Risk [Member] |
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| Risk [Text Block] |
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• | Investment in Other Investment Companies Risk – As with other investments, investments in other investment companies are subject to market and selection risk. To the extent that the Portfolio acquires shares of investment companies, shareholders bear both their proportionate share of expenses in the Portfolio (including management and advisory fees) and, indirectly, the expenses of the acquired investment companies. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Exchange-Traded Funds Risk [Member] |
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| Risk [Text Block] |
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• | Exchange-Traded Funds Risk – In addition to the risks of investing in other investment companies generally, an investment in securities issued by an ETF may be subject to the following risks: (1) shares of the ETF may trade at a discount to its net asset value; (2) an active trading market for the ETF’s shares may not develop; (3) the exchange on which the ETF is listed may, under certain circumstances, suspend trading of the ETF’s shares; and (4) to the extent that an ETF is acquired in order to track a specific asset or index, the ETF may fail to effectively accomplish that goal. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Foreign Investment Risk [Member] |
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| Risk [Text Block] |
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• | Foreign Investment Risk. Investment in foreign securities involves the following risks: |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Foreign Securities Risk [Member] |
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| Risk [Text Block] |
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• | Foreign Securities Risk – Investments in securities issued by non-U.S. companies and/or non-U.S. governments and their agencies, may be adversely affected by the lack of timely or reliable financial information, political, social and/or economic developments abroad and differences between U.S. and foreign regulatory requirements and market practices. In addition, transaction expenses related to foreign securities, including custody fees, are generally more costly than transaction expenses for domestic securities. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Foreign Currency Risk [Member] |
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| Risk [Text Block] |
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• | Foreign Currency Risk – Securities denominated in foreign currencies are subject to the risk that the value of the foreign currency will decline in relation to the U.S. dollar. Currency exchange rates can be volatile and can be affected by, among other factors, the general economics of a country, or the actions of the U.S. or foreign governments or central banks. In addition, transaction expenses related to currency conversion costs and foreign exchange may be incurred in connection with the purchase and sale of foreign securities. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Emerging Markets Risk [Member] |
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| Risk [Text Block] |
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• | Emerging Markets Risk – Risks associated with foreign investments may be intensified in the case of investments in emerging market countries, whose political, legal and economic systems are less developed and less stable than those of more developed nations. Such investments are often less liquid and/or more volatile than securities issued by companies located in developed nations, such as the United States, Canada and those included in the Morgan Stanley Capital International Europe, Australasia and Far East (“MSCI EAFE”) Index. Certain types of securities, including emerging market securities, are subject to the risk that the securities may not be |
sold at the quoted market price within a reasonable period of time. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Fixed Income Risk [Member] |
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| Risk [Text Block] |
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• | Fixed Income Risk. Investments in fixed income securities may involve the following risks, depending on the instrument involved: |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Credit Risk [Member] |
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| Prospectus [Line Items] |
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| Risk [Text Block] |
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• | Credit Risk – An investment in the Portfolio also involves the risk that the issuer of a fixed income security that the Portfolio holds will fail to make timely payments of interest or principal, or go bankrupt, or that the value of the securities will decline because of a market perception that the issuer may not make payments on time, thus potentially reducing the Portfolio’s return. Changes in economic conditions are likely to cause issuers of these fixed income securities to be unable to meet their obligations. The lower the rating of a debt security, the higher its credit risk. In addition, the securities of many U.S. Government agencies, authorities or instrumentalities in which the Portfolio may invest are neither issued nor guaranteed by the U.S. Government, and may be supported only by the ability of the issuer to borrow from the U.S. Treasury or by the credit of the issuer. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Interest Rate Risk [Member] |
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| Risk [Text Block] |
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• | Interest Rate Risk – The value of fixed income securities held in the Portfolio, including U.S. Government securities, may decline with changes in interest rates. Prices of fixed income securities with longer effective maturities are more sensitive to interest rate changes than those with shorter effective maturities. U.S. Government securities can exhibit price movements resulting from changes in interest rates. During low interest rate environments, the risk that interest rates will rise is increased. Such increases may expose fixed income markets to heightened volatility and reduced liquidity for certain fixed income investments, particularly those with longer maturities. These risks are greater when a low interest rate environment has existed for an extended period of time. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Asset-Backed/Mortgage-Backed Security Risk [Member] |
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| Risk [Text Block] |
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• | Asset-Backed/Mortgage-Backed Security Risk – The market value and yield of asset-backed and mortgage-backed securities can vary due to market interest rate fluctuations and early prepayments of underlying instruments. Although these securities may offer yields higher than those available from other types of securities, these securities may be less effective than other types of securities as a means of “locking in” attractive long-term rates because of the prepayment feature. During periods of difficult or frozen credit markets, significant changes in |
interest rates, or deteriorating economic conditions, such securities may decline in value, face valuation difficulties, become more volatile and/or become illiquid. Mortgage-backed securities may be particularly susceptible to Prepayment Risk. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Extension Risk [Member] |
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| Risk [Text Block] |
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• | Extension Risk – Fixed income securities held by the Portfolio are subject to the risk that payment on the loans underlying the securities held by the Portfolio will be made more slowly when interest rates are rising. This could cause the market value of the securities to decline. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Call/Prepayment Risk [Member] |
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| Risk [Text Block] |
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• | Call/Prepayment Risk – When interest rates are declining, issuers of fixed income securities held by the Portfolio may prepay principal earlier than scheduled. As a result of this risk, the Portfolio may have to reinvest these prepayments at those lower rates, thus reducing its income. Mortgage-backed and asset-backed securities are especially sensitive to prepayment. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | High Yield Bond Risk [Member] |
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| Risk [Text Block] |
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• | High Yield Bond Risk – High yield bonds, commonly referred to as “junk bonds,” are considered speculative under traditional investment standards. Prices of these securities will rise and fall primarily in response to changes in the issuer’s financial health, although changes in market interest rates also will affect prices. High yield bonds may also experience reduced liquidity, and sudden and substantial decreases in price, during certain market conditions. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Real Estate Investing Risk [Member] |
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| Risk [Text Block] |
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• | Real Estate Investing Risk. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Real Estate Markets and REIT Risk [Member] |
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| Risk [Text Block] |
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• | Real Estate Markets and REIT Risk – Certain investments in the Portfolio will be closely linked to the performance of the real estate markets. Property values may fall due to increasing vacancies or declining rents resulting from unanticipated economic, legal, cultural or technological developments. REIT prices may also fall because of the failure of borrowers to pay their loans and/or poor management. The value of real estate (and real estate securities) may also be affected by increases in property taxes and changes in tax laws and interest rates. The value of securities of companies that service the real estate industry may also be affected by such risks. To the extent that the Portfolio invests in REITs and real estate partnerships, shareholders bear both their proportionate share of expenses in the Portfolio (including management and advisory fees) and, indirectly, the expenses of the acquired REITs and real estate partnerships. Investments in REITs and real |
estate partnerships (if any) may cause a greater portion of the Portfolio’s distributions to be taxable as ordinary income. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Risks Associated with Investments in Derivatives [Member] |
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| Risk [Text Block] |
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• | Risks Associated with Investments in Derivatives. The Portfolio is permitted to invest in derivative instruments, including options, futures and options on futures. Investment in derivatives depends largely on the performance of an underlying reference instrument or rate and the Specialist Manager’s ability to predict correctly the direction of securities prices, interest rates, currency exchange rates and/or other economic factors. Derivatives involve additional costs and often have risks similar to an investment in the reference instrument in addition to other risks, such as: |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | General Derivative Risks [Member] |
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| Prospectus [Line Items] |
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| Risk [Text Block] |
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• | General Derivative Risks – Derivatives may be volatile and may involve significant risks. The Portfolio’s exposure to derivatives involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other investments. The underlying security, measure or other instrument on which a derivative is based, or the derivative itself, may not perform as expected, and hedging positions may not correlate closely with the instruments or exposures being hedged. Normally derivatives involve leverage, which means that their use can significantly magnify the effect of price movements of the underlying securities or reference measures, disproportionately increasing the Portfolio’s losses and reducing the Portfolio’s opportunities for gains. Some derivatives have the potential for unlimited loss, including a loss that may be greater than the amount invested. Derivatives also present default risks if the counterparty to a derivatives contract fails to fulfill its obligations to the Portfolio. Certain derivatives held by the Portfolio may be illiquid, including non-exchange-traded or over-the-counter derivatives that are linked to illiquid instruments or illiquid markets, making it difficult to close out an unfavorable position. Derivatives also may be more difficult to purchase, sell or value than other instruments. Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Portfolio. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Counterparty Risk [Member] |
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| Prospectus [Line Items] |
oef_ProspectusLineItems |
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| Risk [Text Block] |
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• | Counterparty Risk – The Portfolio will be subject to counterparty credit risk with respect to derivative contracts entered into by the Portfolio or held by special purpose or structured vehicles in which the Portfolio invests, including other investment companies. If a counterparty becomes bankrupt or |
otherwise fails to perform its obligations due to financial difficulties, the Portfolio may experience significant delays in obtaining any recovery in a bankruptcy or other reorganization proceeding. The Portfolio may obtain only a limited recovery or may obtain no recovery in such circumstances. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Derivatives Tax Risk [Member] |
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| Prospectus [Line Items] |
oef_ProspectusLineItems |
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| Risk [Text Block] |
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• | Derivatives Tax Risk – Compared to other types of investments, derivatives may be less tax efficient. In addition, changes in government regulation of derivative instruments could affect the character, timing and amount of the Portfolio’s taxable income or gains, and may limit or prevent the Portfolio’s use of certain derivative instruments, which could make the investment strategy more costly to implement or require the Portfolio to change its investment strategy. These rules may: (i) affect whether gains and losses recognized by the Portfolio are treated as ordinary or capital or as short-term or long-term, (ii) accelerate the recognition of income or gains to the Portfolio, (iii) defer losses to the Portfolio, and (iv) cause adjustments in the holding periods of the Portfolio’s securities. The Portfolio’s use of derivatives may be limited by the requirements for taxation of the Portfolio as a regulated investment company. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Options Risk [Member] |
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| Prospectus [Line Items] |
oef_ProspectusLineItems |
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| Risk [Text Block] |
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• | Options Risk – Purchasing and writing put and call options are specialized activities that may entail greater-than-ordinary investment risks and are considered speculative. An option gives the purchaser, in exchange for a premium, the right, but not the obligation, to buy (a “call option”) or sell (a “put option”) an underlying security or futures contract – or receive a cash settlement based on an underlying asset, rate or index – at a specified price during a specified period or on a specified date. When the Portfolio writes an option, it retains the premium if the option expires unexercised but may incur a net loss if the cost of satisfying its obligations exceeds the premium received. A written call option exposes the Portfolio to the risk that it will be required to sell the underlying instrument below its market value, while a written put option exposes the Portfolio to the risk that it will be required to purchase the underlying instrument above its market value. When the Portfolio purchases an option, it may lose some or all of the premium if the underlying instrument does not move sufficiently in the anticipated direction, including the entire premium if the option expires without being sold or exercised. Options written on instruments intended to replicate an index present the same risks, and those instruments may not closely track the index. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Options Writing Strategy Risk [Member] |
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| Prospectus [Line Items] |
oef_ProspectusLineItems |
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| Risk [Text Block] |
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• | Options Writing Strategy Risk – if the underlying index appreciates or depreciates sufficiently over the period to offset the new premium received from the written option on that index, a net loss will result. In addition, the Portfolio may write options on index substitutes, which are subject to the same risks as index options. The value of the index substitute is subject to change as the values of the component securities fluctuate and the performance of the index substitute may not exactly match the performance of the index. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Futures Risk [Member] |
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| Prospectus [Line Items] |
oef_ProspectusLineItems |
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| Risk [Text Block] |
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• | Futures Risk – there can be no assurance that price movements in the futures markets will correlate with the prices of the underlying securities positions. Additionally, price distortions could result if investors in the futures markets opt to make or take delivery of the underlying securities rather than engage in closing transactions because such trend might result in a reduction in the liquidity of the futures market. Further, an increase in the participation of speculators in the futures market could cause temporary price distortions. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Swaps Risks [Member] |
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| Prospectus [Line Items] |
oef_ProspectusLineItems |
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| Risk [Text Block] |
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• | Swaps Risks – The use of swaps is a highly specialized activity which involves investment techniques, risk analyses and tax planning different from those associated with ordinary portfolio securities transactions. Swap transactions can result in sizeable realized and unrealized capital gains and losses relative to the gains and losses from the Portfolio’s direct investments in securities and short sales. Transactions in swaps can involve greater risks than if the Portfolio had invested in securities directly since, in addition to general market risks, swaps may be leveraged and are also subject to liquidity risk, counterparty risk, credit risk and valuation risk. Regulators also may impose limits on an entity’s or group of entities’ positions in certain swaps. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Other Risks [Member] |
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| Prospectus [Line Items] |
oef_ProspectusLineItems |
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| Risk [Text Block] |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | Liquidity Risk [Member] |
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| Prospectus [Line Items] |
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| Risk [Text Block] |
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• | Liquidity Risk – At times, certain securities may be difficult or impossible to sell at the price that would normally prevail in the market. The seller may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Portfolio management or performance. This includes the risk of missing out on an investment opportunity because the assets necessary to take advantage of it are tied up in less advantageous investments. |
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio |
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| Prospectus [Line Items] |
oef_ProspectusLineItems |
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| Maximum Deferred Sales Charge (as a percentage of Offering Price) |
oef_MaximumDeferredSalesChargeOverOfferingPrice |
0.00%
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| Redemption Fee (as a percentage of Amount Redeemed) |
oef_RedemptionFeeOverRedemption |
0.00%
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| Management Fees (as a percentage of Assets) |
oef_ManagementFeesOverAssets |
0.08%
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| Other Expenses (as a percentage of Assets): |
oef_OtherExpensesOverAssets |
0.06%
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| Acquired Fund Fees and Expenses |
oef_AcquiredFundFeesAndExpensesOverAssets |
0.04%
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| Expenses (as a percentage of Assets) |
oef_ExpensesOverAssets |
0.18%
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[1] |
| Expense Example, with Redemption, 1 Year |
oef_ExpenseExampleYear01 |
$ 18
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| Expense Example, with Redemption, 3 Years |
oef_ExpenseExampleYear03 |
58
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| Expense Example, with Redemption, 5 Years |
oef_ExpenseExampleYear05 |
101
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| Expense Example, with Redemption, 10 Years |
oef_ExpenseExampleYear10 |
$ 230
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| The Institutional U.S. Equity Portfolio | MSCI USA Index (reflects no deduction for fees, expenses or taxes) |
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| Prospectus [Line Items] |
oef_ProspectusLineItems |
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| Average Annual Return, Percent |
oef_AvgAnnlRtrPct |
17.75%
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| Average Annual Return, Percent |
oef_AvgAnnlRtrPct |
13.87%
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| Average Annual Return, Percent |
oef_AvgAnnlRtrPct |
14.79%
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio |
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| Prospectus [Line Items] |
oef_ProspectusLineItems |
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| Annual Return [Percent] |
oef_AnnlRtrPct |
6.82%
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| Annual Return [Percent] |
oef_AnnlRtrPct |
27.17%
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| Annual Return [Percent] |
oef_AnnlRtrPct |
(0.36%)
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| Annual Return [Percent] |
oef_AnnlRtrPct |
32.13%
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| Annual Return [Percent] |
oef_AnnlRtrPct |
26.99%
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| Annual Return [Percent] |
oef_AnnlRtrPct |
24.76%
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| Annual Return [Percent] |
oef_AnnlRtrPct |
(21.39%)
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| Annual Return [Percent] |
oef_AnnlRtrPct |
24.91%
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| Annual Return [Percent] |
oef_AnnlRtrPct |
22.07%
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| Annual Return [Percent] |
oef_AnnlRtrPct |
16.88%
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| Average Annual Return, Percent |
oef_AvgAnnlRtrPct |
16.88%
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| Average Annual Return, Percent |
oef_AvgAnnlRtrPct |
11.81%
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| Average Annual Return, Percent |
oef_AvgAnnlRtrPct |
14.78%
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | After Taxes on Distributions |
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| Prospectus [Line Items] |
oef_ProspectusLineItems |
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| Average Annual Return, Percent |
oef_AvgAnnlRtrPct |
11.78%
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| Average Annual Return, Percent |
oef_AvgAnnlRtrPct |
7.15%
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| Average Annual Return, Percent |
oef_AvgAnnlRtrPct |
11.02%
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| The Institutional U.S. Equity Portfolio | The Institutional U.S. Equity Portfolio | After Taxes on Distributions and Sales |
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| Prospectus [Line Items] |
oef_ProspectusLineItems |
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| Average Annual Return, Percent |
oef_AvgAnnlRtrPct |
12.08%
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| Average Annual Return, Percent |
oef_AvgAnnlRtrPct |
8.07%
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| Average Annual Return, Percent |
oef_AvgAnnlRtrPct |
11.04%
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