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Risk/Return:

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Risk/Return [Heading]

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Lazard Emerging Markets Debt Portfolio

Objective [Heading]

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Investment Objective

Objective, Primary [Text Block]

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The Portfolio seeks total return from current income and capital appreciation.

Expense [Heading]

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Fees and Expenses

Expense Narrative [Text Block]

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This table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio.

Shareholder Fees Caption [Text]

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Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

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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

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2016-05-01

Portfolio Turnover [Heading]

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Portfolio Turnover

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” 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 204% of the average value of its portfolio.

Portfolio Turnover, Rate

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Expense Example [Heading]

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Example

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 hold or 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 operating expenses remain the same, giving effect to the fee waiver and expense reimbursement arrangement described above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy [Heading]

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Principal Investment Strategies

Strategy Narrative [Text Block]

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The Portfolio invests primarily in debt securities issued or guaranteed by governments, government agencies or supranational bodies or companies or other private-sector entities, including fixed and/or floating rate investment grade and non-investment grade bonds, convertible securities, commercial paper, CDOs, short- and medium-term obligations and other fixed-income obligations, and may invest in money market instruments such as certificates of deposit. The securities in which the Portfolio invests may be denominated in the US dollar, the Canadian dollar, the Euro, the Japanese yen, the Pound Sterling, or the local currency of the issuer.

Under normal circumstances, the Portfolio invests at least 80% of its assets in debt securities that are economically tied to emerging market countries. Emerging market countries include all countries not represented by the MSCI World Index. The Portfolio currently intends to focus its investments in Asia, Africa, the Middle East, Latin America and the developing countries of Europe, although the allocation of the Portfolio’s assets among countries and regions may vary from time to time based on the Investment Manager’s judgment and its analysis of market conditions.

The Portfolio may invest without limitation in securities rated below investment grade (e.g., lower than Baa by Moody’s or lower than BBB by S&P) (“junk bonds”) or securities that are unrated. Additionally, the Portfolio is not restricted to investments in securities of any particular maturity or duration. Duration is an estimate of the sensitivity of the price (the value of principal) of a fixed-income security to a change in interest rates. Generally, the longer the duration, the higher the expected volatility. For example, the market price of a fixed-income security with a duration of three years would be expected to decline 3% if interest rates rose 1%. Conversely, the market price of the same security would be expected to increase 3% if interest rates fell 1%.

The Portfolio may, but is not required to enter into forward currency contracts and credit default swaps, for hedging purposes or to seek to increase returns.

The Portfolio is classified as “non-diversified” under the 1940 Act, which means that it may invest a relatively high percentage of its assets in a limited number of issuers, when compared to a diversified fund.

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Principal Investment Risks

Risk Narrative [Text Block]

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The value of your investment in the Portfolio will fluctuate, which means you could lose money.

Fixed-Income and Debt Securities Risk. The market value of a debt security may decline due to general market conditions that are not specifically related to a particular company, such as real or perceived adverse economic conditions, changes in the outlook for corporate earnings, changes in interest or currency rates or adverse investor sentiment generally. The debt securities market can be susceptible to increases in volatility and decreases in liquidity. Prices of bonds and other debt securities tend to move inversely with changes in interest rates. Increases in volatility and decreases in liquidity may be caused by a rise in interest rates (or the expectation of a rise in interest rates). Interest rate risk is usually greater for fixed-income securities with longer maturities or durations.

The Portfolio’s investments in lower-rated, higher-yielding securities (“junk bonds”) are subject to greater credit risk than its higher rated investments. Credit risk is the risk that the issuer will not make interest or principal payments, or will not make payments on a timely basis. Non-investment grade securities tend to be more volatile, less liquid and are considered speculative. If there is a decline, or perceived decline, in the credit quality of a debt security (or any guarantor of payment on such security), the security’s value could fall, potentially lowering the Portfolio’s share price. The prices of non-investment grade securities, unlike investment grade debt securities, may fluctuate unpredictably and not necessarily inversely with changes in interest rates. The market for these securities may be less liquid and therefore these securities may be harder to value or sell at an acceptable price, especially during times of market volatility or decline. Liquidity can decline unpredictably in response to overall economic conditions or credit tightening.

Some debt securities may give the issuer the option to call, or redeem, the securities before their maturity. If securities held by the Portfolio are called during a time of declining interest rates (which is typically the case when issuers exercise options to call outstanding securities), the Portfolio may have to reinvest the proceeds in an investment offering a lower yield (and the Portfolio may not fully benefit from any increase in the value of its portfolio holdings as a result of declining interest rates).

Market Risk. Market risks, including political, regulatory, market and economic developments, and developments that impact specific economic sectors, industries or segments of the market, can affect the value of the Portfolio’s investments. In addition, turbulence in financial markets and reduced liquidity in equity, credit and/or fixed income markets may negatively affect many issuers, which could adversely affect the Portfolio.

Issuer Risk. The value of a security may decline for a number of reasons which directly relate to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods or services, as well as the historical and prospective earnings of the issuer and the value of its assets or factors unrelated to the issuer’s value, such as investor perception.

Non-US Securities Risk. The Portfolio’s performance will be influenced by political, social and economic factors affecting the non-US countries and companies in which the Portfolio invests. Non-US securities carry special risks, such as less developed or less efficient trading markets, political instability, a lack of company information, differing auditing and legal standards, and, potentially, less liquidity.

Emerging Market Risk. Emerging market countries can generally have economic structures that are less diverse and mature, and political systems that are less stable, than those of developed countries. The economies of countries with emerging markets may be based predominantly on only a few industries, may be highly vulnerable to changes in local or global trade conditions, and may suffer from extreme debt burdens or volatile inflation rates. The securities markets of emerging market countries have historically been extremely volatile. These market conditions may continue or worsen. Significant devaluation of emerging market currencies against the US dollar may occur subsequent to acquisition of investments denominated in emerging market currencies.

Foreign Currency Risk. Investments denominated in currencies other than US dollars may experience a decline in value, in US dollar terms, due solely to fluctuations in currency exchange rates. Currency investments could be adversely affected by delays in, or a refusal to grant, repatriation of funds or conversion of emerging market currencies.

Liquidity Risk. The lack of a readily available market may limit the ability of the Portfolio to sell certain securities at the time and price it would like. The size of certain debt securities offerings of emerging markets issuers may be relatively smaller in size than debt offerings in more developed markets and, in some cases, the Portfolio, by itself or together with other Portfolios or other accounts managed by the Investment Manager, may hold a position in a security that is large relative to the typical trading volume for that security; these factors can make it difficult for the Portfolio to dispose of the position at the desired time or price.

Non-Diversification Risk. The Portfolio’s NAV may be more vulnerable to changes in the market value of a single issuer or group of issuers and may be relatively more susceptible to adverse effects from any single corporate, industry, economic, market, political or regulatory occurrence than if the Portfolio’s investments consisted of securities issued by a larger number of issuers.

Forward Currency Contracts and Other Derivatives Risk. Forward currency contracts and other derivatives transactions, including those entered into for hedging purposes, may reduce returns or increase volatility, perhaps substantially. Forward currency contracts, over-the-counter options on currencies, swap agreements and other over-the-counter derivatives transactions are subject to the risk of default by the counterparty and can be illiquid. These derivatives transactions, as well as the exchange-traded options in which the Portfolio may invest, are subject to many of the risks of, and can be highly sensitive to changes in the value of, the related currency, security or other reference asset. As such, a small investment could have a potentially large impact on the Portfolio’s performance. Use of derivatives transactions, even if entered into for hedging purposes, may cause the Portfolio to experience losses greater than if the Portfolio had not engaged in such transactions.

High Portfolio Turnover Risk. The Portfolio’s investment strategy may involve high portfolio turnover (such as 100% or more). A portfolio turnover rate of 100%, for example, is equivalent to the Portfolio buying and selling all of its securities once during the course of the year. A high portfolio turnover rate could result in high transaction costs and an increase in taxable capital gains distributions to the Portfolio’s shareholders, which will reduce returns to shareholders.

Risk Lose Money [Text]

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The value of your investment in the Portfolio will fluctuate, which means you could lose money.

Risk Nondiversified Status [Text]

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The Portfolio’s NAV may be more vulnerable to changes in the market value of a single issuer or group of issuers and may be relatively more susceptible to adverse effects from any single corporate, industry, economic, market, political or regulatory occurrence than if the Portfolio’s investments consisted of securities issued by a larger number of issuers.

Bar Chart and Performance Table [Heading]

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Performance Bar Chart and Table Year-by-Year Total Returns for Institutional Shares As of 12/31

Performance Narrative [Text Block]

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The accompanying bar chart and table provide some indication of the risks of investing in Lazard Emerging Markets Debt Portfolio by showing the Portfolio’s year-by-year performance and its average annual performance compared to those of broad measures of market performance. The bar chart shows how the performance of the Portfolio’s Institutional Shares has varied from year to year. Updated performance information is available at www.LazardNet.com or by calling (800) 823-6300. The Portfolio’s past performance (before and after taxes) is not necessarily an indication of how the Portfolio will perform in the future.

Performance Information Illustrates Variability of Returns [Text]

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The accompanying bar chart and table provide some indication of the risks of investing in Lazard Emerging Markets Debt Portfolio by showing the Portfolio’s year-by-year performance and its average annual performance compared to those of broad measures of market performance.

Performance Additional Market Index [Text]

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The 50% JPMorgan Emerging Market Bond Index Global Diversified Index/50% JPMorgan Government Bond Index—Emerging Markets Global Diversified Index shown in the table is an unmanaged index created by the Investment Manager, and is a 50/50 blend of the JPMorgan Emerging Market Bond Index Global Diversified Index and the JPMorgan Government Bond Index—Emerging Markets Global Diversified Index.

Performance Availability Phone [Text]

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(800) 823-6300

Performance Availability Website Address [Text]

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www.LazardNet.com

Performance Past Does Not Indicate Future [Text]

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The Portfolio’s past performance (before and after taxes) is not necessarily an indication of how the Portfolio will perform in the future.

Bar Chart Closing [Text Block]

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Best Quarter:
3/31/12 7.52%

Worst Quarter:
6/30/13 -7.60%

Highest Quarterly Return, Label

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Best Quarter:

Highest Quarterly Return, Date

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Mar. 31, 2012

Highest Quarterly Return

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Lowest Quarterly Return, Label

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Worst Quarter:

Lowest Quarterly Return, Date

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Jun. 30, 2013

Lowest Quarterly Return

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Performance Table Heading

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Average Annual Total Returns (for the periods ended December 31, 2014)

Index No Deduction for Fees, Expenses, Taxes [Text]

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(reflects no deduction for fees, expenses or taxes)

Performance Table Uses Highest Federal Rate

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After-tax returns are calculated using the historical highest individual marginal income tax rates and do not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

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The after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.

Performance Table One Class of after Tax Shown [Text]

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After-tax returns are shown only for Institutional Shares. After-tax returns of the Portfolio’s other share classes will vary.

Performance Table Narrative

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After-tax returns are shown only for Institutional Shares. After-tax returns of the Portfolio’s other share classes will vary. After-tax returns are calculated using the historical highest individual marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. Returns shown below for the Portfolio’s R6 Shares (which were not operational as of December 31, 2014) reflect the performance of the Portfolio’s Institutional Shares. R6 Shares would have had substantially similar returns as Institutional Shares because the share classes are invested in the same portfolio of securities, and the returns would differ only to the extent that the classes do not have the same expenses.

The 50% JPMorgan Emerging Market Bond Index Global Diversified Index/50% JPMorgan Government Bond Index—Emerging Markets Global Diversified Index shown in the table is an unmanaged index created by the Investment Manager, and is a 50/50 blend of the JPMorgan Emerging Market Bond Index Global Diversified Index and the JPMorgan Government Bond Index—Emerging Markets Global Diversified Index.

JPMorgan Emerging Market Bond Index Global Diversified® Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

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Life of Portfolio

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JPMorgan Government Bond Index – Emerging Markets Global Diversified® Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

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Life of Portfolio

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50% JPMorgan Emerging Market Bond Index Global Diversified Index/ 50% JPMorgan Government Bond Index – Emerging Markets Global Diversified Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

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Life of Portfolio

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Institutional Shares

Risk/Return:

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Redemption Fee (as a percentage of Amount Redeemed)

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Management Fees

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Distribution and Service (12b-1) Fees

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none

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Total Annual Portfolio Operating Expenses

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Fee Waiver or Reimbursement

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^[1]

Total Annual Portfolio Operating Expenses After Fee Waiver and Expense Reimbursement

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Expense Example, with Redemption, 1 Year

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Expense Example, with Redemption, 3 Years

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Expense Example, with Redemption, 5 Years

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Expense Example, with Redemption, 10 Years

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Annual Return 2012

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Annual Return 2013

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Annual Return 2014

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Life of Portfolio

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Feb. 28, 2011

Institutional Shares | After Taxes on Distributions

Risk/Return:

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Life of Portfolio

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Institutional Shares | After Taxes on Distributions and Sale of Portfolio Shares

Risk/Return:

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Life of Portfolio

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Open Shares

Risk/Return:

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Redemption Fee (as a percentage of Amount Redeemed)

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Management Fees

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Distribution and Service (12b-1) Fees

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Total Annual Portfolio Operating Expenses

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Fee Waiver or Reimbursement

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^[1]

Total Annual Portfolio Operating Expenses After Fee Waiver and Expense Reimbursement

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Expense Example, with Redemption, 1 Year

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Expense Example, with Redemption, 3 Years

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Expense Example, with Redemption, 5 Years

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Expense Example, with Redemption, 10 Years

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Life of Portfolio

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Feb. 28, 2011

R6 Shares

Risk/Return:

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Redemption Fee (as a percentage of Amount Redeemed)

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Management Fees

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Distribution and Service (12b-1) Fees

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none

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^[2]

Total Annual Portfolio Operating Expenses

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Fee Waiver or Reimbursement

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^[1]

Total Annual Portfolio Operating Expenses After Fee Waiver and Expense Reimbursement

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Other Expenses, New Fund, Based on Estimates [Text]

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“Other Expenses” are based on estimated amounts for the current fiscal year, using “Other Expenses” for Institutional Shares from the last fiscal year.

Expense Example, with Redemption, 1 Year

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Expense Example, with Redemption, 3 Years

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Expense Example, with Redemption, 5 Years

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Expense Example, with Redemption, 10 Years

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Life of Portfolio

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[1]

Reflects a contractual agreement by the Investment Manager to waive its fee and, if necessary, reimburse the Portfolio through May 1, 2016, to the extent Total Annual Portfolio Operating Expenses exceed 1.00%, 1.30% and .95% of the average daily net assets of the Portfolio's Institutional Shares, Open Shares and R6 Shares, respectively, and from May 2, 2016 through May 1, 2025, to the extent Total Annual Portfolio Operating Expenses exceed 1.10%, 1.40% and 1.05% of the average daily net assets of the Portfolio's Institutional Shares, Open Shares and R6 Shares, respectively. All limitations on Total Annual Portfolio Operating Expenses are exclusive of taxes, brokerage, interest on borrowings, fees and expenses of "Acquired Funds" and extraordinary expenses, and excluding shareholder redemption fees or other transaction fees. This agreement can only be amended by agreement of the Fund, upon approval by the Board, and the Investment Manager to lower the net amount shown and will terminate automatically in the event of termination of the Investment Management Agreement between the Investment Manager and the Fund, on behalf of the Portfolio.

[2]

"Other Expenses" are based on estimated amounts for the current fiscal year, using "Other Expenses" for Institutional Shares from the last fiscal year.