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Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Lazard Explorer Total Return Portfolio
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

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

Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

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

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
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 2015-04-30
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 period from the Portfolio’s inception on June 28, 2013 to December 31, 2013, the Portfolio’s turnover rate was 69% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 69.00%
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 that the Portfolio’s operating expenses remain the same, giving effect to the fee waiver and expense reimbursement arrangement in year one only. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Portfolio utilizes a flexible total return investment strategy. It typically invests primarily in debt securities issued or guaranteed by governments, government agencies or supranational bodies, forward contracts, including non-deliverable forward contracts, credit default swap agreements (on an index or basket of securities or a single security), interest rate swap agreements and foreign currency options, debt securities issued by companies or other private-sector entities, including fixed and/or floating rate investment grade and non-investment grade bonds; short- and medium-term obligations and other fixed-income obligations. The Portfolio may also invest in certain other types of securities, such as convertible securities, commercial paper, and collateralized debt obligations. At certain times, based on the currently existing market environment, the Investment Manager may not believe it is able to find sufficient opportunities to invest in these types of securities and may determine to tactically shift the Portfolio to invest substantially in money market instruments, such as short-term US Treasury securities and certificates of deposit. The securities in which the Portfolio invests may be denominated in any currency.


The Portfolio typically focuses its investments in securities of that are economically tied to emerging market countries. Emerging market countries include all countries not represented by the MSCI World Index. 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 is not limited to securities of any particular quality or investment grade and, as a result, the Portfolio may invest significantly 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 Investment Manager expects to actively increase and decrease the Portfolio’s exposures to emerging market securities and currencies, and to significantly utilize derivatives. The Portfolio expects to utilize the following types of derivatives: forward contracts (including non-deliverable forward contracts, which settle in cash based on the difference between the agreed upon contract price or rate and the prevailing spot price or rate on an agreed notional amount), credit default swap agreements (including credit default swap agreements on an index or basket of securities or a single security), interest rate swap agreements and foreign currency options. Derivative positions may represent a substantial investment exposure through the economic leverage embedded in these positions. Although the Portfolio does not have a history of operations, based on the portfolios of other clients of the Investment Manager managed in a strategy similar to that to be employed for the Portfolio, the aggregate notional amount of derivative positions may typically be expected to range from 20% to 70% of the Portfolio’s assets. The Investment Manager may change the Portfolio’s investment exposures frequently, and positions may be held for only a short period of time as the Investment Manager seeks to add value in different market environments in pursuit of the Portfolio’s total return objective. However, there is no guarantee that the Portfolio will achieve its investment objective, and an investment in the Portfolio involves a high degree of risk.


When the Investment Manager determines that adverse market conditions exist, the Portfolio may adopt a temporary defensive position and invest some or all of its assets in money market instruments. In pursuing a temporary defensive strategy, the Portfolio may forgo potentially more profitable investment strategies and, as a result, may not achieve its stated investment objective.


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.

Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

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


Fixed-Income and Debt Securities Risk. While fixed-income securities are designed to produce a stable stream of income, their prices move inversely with changes in interest rates (i.e., as interest rates go up, prices go down). 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 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.


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 securities markets of emerging market countries have historically been extremely volatile. However, capital markets worldwide have experienced unprecedented volatility in recent years, causing significant declines in valuation and liquidity in certain emerging markets. 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. The Portfolio’s investments could be adversely affected by delays in, or a refusal to grant, repatriation of funds or conversion of 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.


Foward 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, swap agreements, over-the-counter options on securities (including options on ETFs) and currencies and other over-the-counter derivatives transactions are subject to the risk of default by the counterparty and can be illiquid. Changes in liquidity may result in significant, rapid and unpredictable changes in the prices for derivatives. 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, interest rate or other reference asset. As such, a small investment could have a potentially large impact on the Portfolio’s performance. Successful use of derivatives is subject to the Investment Manager’s ability to predict correctly movements in the direction of the relevant reference asset or market. Use of derivatives transactions may cause the Portfolio to experience significant losses.


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.


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] rr_RiskLoseMoney The value of your investment in the Portfolio will fluctuate, which means you could lose money.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus 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] rr_BarChartAndPerformanceTableHeading Performance Bar Chart and Table
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

Because the Portfolio did not have a full calendar year of performance as of the date of this Prospectus, no performance returns are presented. Annual performance returns provide some indication of the risks of investing in the Portfolio by showing changes in performance from year to year. Comparison of Portfolio performance to an appropriate index indicates how the Portfolio’s average annual returns compare with those of a broad measure of market performance. 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] rr_PerformanceInformationIllustratesVariabilityOfReturns Annual performance returns provide some indication of the risks of investing in the Portfolio by showing changes in performance from year to year.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess Because the Portfolio did not have a full calendar year of performance as of the date of this Prospectus, no performance returns are presented.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone (800) 823-6300
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.LazardNet.com
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 the Portfolio will perform in the future.
Institutional Shares
  
Risk/Return: rr_RiskReturnAbstract  
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Management Fees rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 1.97%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 2.97%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.67%) [1]
Total Annual Portfolio Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 1.30% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 132
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 761
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,415
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,171
Open Shares
  
Risk/Return: rr_RiskReturnAbstract  
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Management Fees rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 3.76%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 5.01%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (3.41%) [1]
Total Annual Portfolio Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 1.60% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 163
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,199
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 2,234
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 4,823
R6 Shares
  
Risk/Return: rr_RiskReturnAbstract  
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Management Fees rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 1.97% [2]
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 2.97%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.72%) [1]
Total Annual Portfolio Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 1.25% [1]
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates "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 rr_ExpenseExampleYear01 127
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 756
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,411
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 3,167
[1] Reflects a contractual agreement by the Investment Manager to waive its fee and, if necessary, reimburse the Portfolio through April 30, 2015, to the extent Total Annual Portfolio Operating Expenses exceed 1.30%, 1.60% and 1.25% of the average daily net assets of the Portfolio's Institutional Shares, Open Shares and R6 Shares, respectively, 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.