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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

The Emerging Markets Portfolio II
Objective [Heading] rr_ObjectiveHeading

What is the Portfolio’s investment objective?
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Portfolio seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading

What are the Portfolio’s fees and expenses? 
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption

Annual portfolio operating expenses (expenses that you pay each year as a percentage of the value of your investment
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

Feb. 27, 2015
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading

Portfolio turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Portfolio pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” 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 annual Portfolio operating expenses or in the example, affect the Portfolio’s performance. During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 11% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 11.00%
Expense Example [Heading] rr_ExpenseExampleHeading

Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

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 reflects the Manager’s fee waivers and expense reimbursements for the 1-year period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading

What are the Portfolio’s principal investment strategies?
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Portfolio invests primarily in a broad range of equity securities of companies located in emerging market countries. Emerging market countries include those currently considered to be developing by the World Bank, the United Nations or the countries’ governments. These countries typically are located in the Asia-Pacific region, Eastern Europe, the Middle East, Central and South America, and Africa. The Portfolio may invest in companies of any size. Under normal market conditions, at least 80% of the Portfolio’s net assets, plus any borrowings for investment purposes, will be invested in equity securities of issuers from countries whose economies are considered to be emerging (80% policy). The Portfolio’s 80% policy can be changed without shareholder approval. However, shareholders would be given at least 60 days’ notice prior to any such change.

 

The Portfolio may invest in a broad range of equity securities, including common or ordinary stocks, preferred stocks, and securities convertible into common or ordinary stocks. The Portfolio may also invest in foreign companies through sponsored or unsponsored depositary receipts, which are receipts typically issued by a bank or trust company evidencing ownership of underlying securities issued by a foreign company. The Portfolio may invest in securities issued in any currency and may hold foreign currency. The Portfolio invests primarily in equity securities of issuers from emerging foreign countries. These countries are generally recognized to be emerging or developing countries by the international financial community.

 

The portfolio manager believes that although market price and intrinsic business value are positively correlated in the long run, short-term divergences can emerge. The Portfolio seeks to take advantage of these divergences through a fundamental, bottom-up approach. The Portfolio invests in securities of companies with sustainable franchises when they are trading at a discount to the manager’s intrinsic value estimate for that security.

 

The Portfolio defines sustainable franchises as those companies with potential to earn excess returns above their cost of capital over the long run. Sustainability analysis involves identification of a company’s source of competitive advantage and the ability of its management to maximize its return potential. We prefer companies with large market opportunities in which to deploy capital, providing opportunities to grow faster than the overall economy.

 

Intrinsic value assessment is quantitatively determined through a variety of valuation methods including discounted cash flow, replacement cost, private market transaction, and multiples analysis.

 

The Portfolio may invest more than 25% of its total assets in the securities of issuers located in the same country. The Portfolio may invest up to 10% of its net assets in real estate investment trusts.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration

Under normal market conditions, at least 80% of the Portfolio’s net assets, plus any borrowings for investment purposes, will be invested in equity securities of issuers from countries whose economies are considered to be emerging (80% policy). The Portfolio’s 80% policy can be changed without shareholder approval. However, shareholders would be given at least 60 days’ notice prior to any such change.
Risk [Heading] rr_RiskHeading

What are the principal risks of investing in the Portfolio?
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Portfolio will increase and decrease according to changes in the value of the securities in its portfolio. Principal risks include:

 

Risk Definition
Investment not guaranteed by
the Manager or its affiliates		 Investments in the Portfolio are not and will not be deposits with or liabilities of Macquarie Bank Limited ABN 46 008 583 542 and its holding companies, including their subsidiaries or related companies (Macquarie Group), and are subject to investment risk, including possible delays in repayment and loss of income and capital invested. No Macquarie Group company guarantees or will guarantee the performance of the Portfolio, the repayment of capital from the Portfolio, or any particular rate of return.
Market risk The risk that all or a majority of the securities in a certain market — such as the stock or bond market — will decline in value because of factors such as adverse political or economic conditions, future expectations, investor confidence, or heavy institutional selling.
Foreign risk The risk that foreign securities (particularly in emerging markets) may be adversely affected by political instability, inefficient markets and higher transaction costs, changes in currency exchange rates, foreign economic conditions, or inadequate or different regulatory and accounting standards.
Small company risk The risk that prices of small-and medium-sized companies may be more volatile than those of larger companies because of limited financial resources or dependence on narrow product lines.
Currency risk The risk that the value of a portfolio’s investments may be negatively affected by changes in foreign currency exchange rates.
Real estate industry risk This risk includes, among others, possible declines in the value of real estate; risks related to general and local economic conditions; possible lack of availability of mortgage funds; overbuilding; extended vacancies of properties; increases in competition, property taxes, and operating expenses; changes in zoning laws; costs resulting from the clean-up of, and liability to third parties resulting from, environmental problems; casualty for condemnation losses; uninsured damages from floods, earthquakes, or other natural disasters; limitations on and variations in rents; and changes in interest rates.
Derivatives risk Derivative contracts, such as options and futures, may involve additional expenses (such as the payment of premiums) and are subject to significant loss if a security or a securities index to which a derivative contract is associated moves in the opposite direction from what the portfolio manager anticipated. Derivative contracts are also subject to the risk that the counterparty may fail to perform its obligations under the contract due to financial difficulties (such as a bankruptcy or reorganization).
Interest rate risk The risk that securities will decrease in value if interest rates rise. The risk is generally associated with bonds; however, because companies in the real estate sector and smaller companies often borrow money to finance their operations, they may be adversely affected by rising interest rates.
Liquidity risk The possibility that securities cannot be readily sold within seven days at approximately the price at which a portfolio has valued them.
Risk Lose Money [Text] rr_RiskLoseMoney

Investing in any mutual fund involves the risk that you may lose part or all of the money you invest.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution

Investments in the Portfolio are not and will not be deposits with or liabilities of Macquarie Bank Limited ABN 46 008 583 542 and its holding companies, including their subsidiaries or related companies (Macquarie Group), and are subject to investment risk, including possible delays in repayment and loss of income and capital invested. No Macquarie Group company guarantees or will guarantee the performance of the Portfolio, the repayment of capital from the Portfolio, or any particular rate of return.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading

How has The Emerging Markets Portfolio II performed?
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart and table below provide some indication of the risks of investing in the Portfolio by showing changes in the Portfolio’s performance from year to year and by showing how the Portfolio’s average annual total returns for the 1-year and lifetime periods compare with those of a broad measure of market performance. The Portfolio’s past performance (before and after taxes) is not necessarily an indication of how it will perform in the future. The returns reflect any expense caps in effect during these periods. The returns would be lower without the expense caps. You may obtain the Portfolio’s most recently available month-end performance by calling 800 231-8002 or by visiting our website at delawareinvestments.com/institutional.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart and table below provide some indication of the risks of investing in the Portfolio by showing changes in the Portfolio’s performance from year to year and by showing how the Portfolio’s average annual total returns for the 1-year and lifetime periods compare with those of a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone

800 231-8002
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress

delawareinvestments.com/institutional
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture

The Portfolio’s past performance (before and after taxes) is not necessarily an indication of how it will perform in the future.
Bar Chart [Heading] rr_BarChartHeading

Year-by-year total return (The Emerging Markets Portfolio II)      
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

During the period illustrated in this bar chart, The Emerging Markets Portfolio II’s highest quarterly return was 12.68% for the quarter ended Sept. 30, 2013 and its lowest quarterly return was -24.40% for the quarter ended Sept. 30, 2011.
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel

highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2013
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 12.68%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel

lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (24.40%)
Performance Table Heading rr_PerformanceTableHeading

Average annual total returns for periods ended December 31, 2013
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes

reflects no deduction for fees, expenses, or taxes
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate

The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the Portfolio’s lifetime and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns are not relevant for shares held in tax-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs).
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

Actual after-tax returns depend on the investor’s individual tax situation and may differ from the returns shown. After-tax returns are not relevant for shares held in tax-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the Portfolio’s lifetime and do not reflect the impact of state and local taxes.
DPT CLASS
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.36%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.36%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.16%) [1]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.20%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 122
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 415
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 729
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,621
Annual Return 2011 rr_AnnualReturn2011 (19.58%)
Annual Return 2012 rr_AnnualReturn2012 14.42%
Annual Return 2013 rr_AnnualReturn2013 10.47%
1 Year rr_AverageAnnualReturnYear01 10.47%
Since Inception rr_AverageAnnualReturnSinceInception 5.60%
MSCI Emerging Markets Index (gross returns) (reflects no deduction for fees, expenses, or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (2.27%)
Since Inception rr_AverageAnnualReturnSinceInception 12.11%
MSCI Emerging Markets Index (net returns) (reflects no deduction for fees or expenses)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (2.60%)
Since Inception rr_AverageAnnualReturnSinceInception 11.97%
Return after taxes on distributions | DPT CLASS
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 10.18%
Since Inception rr_AverageAnnualReturnSinceInception 4.98%
Return after taxes on distributions and sale of Portfolio shares | DPT CLASS
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 6.28%
Since Inception rr_AverageAnnualReturnSinceInception 4.23%
[1] The Portfolio's investment manager, Delaware Management Company (Manager), is contractually waiving its investment advisory fees and/or paying Portfolio expenses (excluding any 12b-1 fees, taxes, interest, short sale and dividend interest expenses, brokerage fees, certain insurance costs, acquired fund fees and expenses, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) to the extent necessary to prevent total annual portfolio operating expenses from exceeding 1.20% of the Portfolio's average daily net assets from Feb. 27, 2014 through Feb. 27, 2015. These waivers and reimbursements may only be terminated by agreement of the Manager and the Portfolio.