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Lazard Developing Markets Equity Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Lazard Developing Markets Equity Portfolio
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Portfolio seeks long-term 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. Investors transacting in Institutional shares through a financial intermediary acting as a broker in an agency capacity may be required to pay a commission directly to the broker.
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 May 01, 2018
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 56% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 56.00%
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 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. 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 invests primarily in equity securities, principally common stocks, of non-US companies whose principal activities are located in emerging market countries (also known as “developing markets”).


Emerging market countries include all countries represented by the MSCI Emerging Markets Index, which currently includes: Brazil, Chile, China, Colombia, Czech Republic, Egypt, Greece, Hungary, India, Indonesia, Korea, Malaysia, Mexico, Peru, Philippines, Poland, Qatar, Russia, South Africa, Taiwan, Thailand, Turkey and United Arab Emirates.


The Investment Manager employs a relative growth investment philosophy that is based on value creation through the process of bottom-up stock selection. The Investment Manager’s approach consists of an analytical framework, accounting validation, fundamental analysis and portfolio construction parameters. The Investment Manager’s selection process focuses on growth and considers the sustainability of growth and the trade off between valuation and growth.


Under normal circumstances, the Portfolio invests at least 80% of its assets in equity securities of companies whose principal business activities are located in emerging market countries.
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.


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. 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. The Investment Manager does not intend to actively hedge the Portfolio’s foreign currency exposure.


Small and Mid Cap Companies Risk. Small and mid cap companies carry additional risks because their earnings tend to be less predictable, their share prices more volatile and their securities less liquid than larger, more established companies. The shares of small and mid cap companies tend to trade less frequently than those of larger companies, which can have an adverse effect on the pricing of these securities and on the ability to sell these securities when the Investment Manager deems it appropriate.


Large Cap Companies Risk. Investments in large cap companies may underperform other segments of the market when such other segments are in favor or because such companies may be less responsive to competitive challenges and opportunities and may be unable to attain high growth rates during periods of economic expansion.


Growth Investing Risk. The Portfolio invests in stocks believed by the Investment Manager to have the potential for growth, but that may not realize such perceived potential for extended periods of time or may never realize such perceived growth potential. Such stocks may be more volatile than other stocks because they can be more sensitive to investor perceptions of the issuing company’s growth potential. The stocks in which the Portfolio invests may respond differently to market and other developments than other types of stocks.


Securities Selection Risk. Securities and other investments selected by the Investment Manager for the Portfolio may not perform to expectations. This could result in the Portfolio’s underperformance compared to other funds with similar investment objectives or strategies.
Risk Lose Money [Text] rr_RiskLoseMoney The value of your investment in the Portfolio will fluctuate, which means you could lose money.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Bar Chart and Table Year-by-Year Total Returns for Institutional Shares As of 12/31
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The accompanying bar chart and table provide some indication of the risks of investing in Lazard Developing Markets Equity Portfolio by showing the Portfolio’s year-by-year performance and its average annual performance compared to that of a broad measure of market performance. The bar chart shows how the performance of the Portfolio’s Institutional Shares 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] rr_PerformanceInformationIllustratesVariabilityOfReturns The accompanying bar chart and table provide some indication of the risks of investing in Lazard Developing Markets Equity Portfolio by showing the Portfolio’s year-by-year performance and its average annual performance compared to that of a broad measure of market performance.
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.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

 

 

 

  

Best Quarter:
6/30/09  56.64%
 
Worst Quarter:
12/31/08  -34.54%

 
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 56.64%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (34.54%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the periods ended December 31, 2016)
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 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 rr_PerformanceTableNotRelevantToTaxDeferred 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] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for Institutional Shares. After-tax returns of the Portfolio’s other share classes will vary.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock

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, 2016) 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.
Lazard Developing Markets Equity Portfolio | MSCI Emerging Markets Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 11.19%
5 Years rr_AverageAnnualReturnYear05 1.28%
Life of Portfolio rr_AverageAnnualReturnSinceInception 3.57%
Lazard Developing Markets Equity Portfolio | Institutional Shares  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.23%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.23%
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets [1]
Total Annual Portfolio Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 1.23% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 125
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 390
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 676
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,489
Annual Return 2009 rr_AnnualReturn2009 108.53%
Annual Return 2010 rr_AnnualReturn2010 28.62%
Annual Return 2011 rr_AnnualReturn2011 (26.15%)
Annual Return 2012 rr_AnnualReturn2012 17.16%
Annual Return 2013 rr_AnnualReturn2013 (3.90%)
Annual Return 2014 rr_AnnualReturn2014 (10.27%)
Annual Return 2015 rr_AnnualReturn2015 (12.84%)
Annual Return 2016 rr_AnnualReturn2016 14.81%
1 Year rr_AverageAnnualReturnYear01 14.81%
5 Years rr_AverageAnnualReturnYear05 0.22%
Life of Portfolio rr_AverageAnnualReturnSinceInception 3.33%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 30, 2008
Lazard Developing Markets Equity Portfolio | Institutional Shares | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 14.76%
5 Years rr_AverageAnnualReturnYear05 0.14%
Life of Portfolio rr_AverageAnnualReturnSinceInception 2.59%
Lazard Developing Markets Equity Portfolio | Institutional Shares | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 8.80%
5 Years rr_AverageAnnualReturnYear05 0.33%
Life of Portfolio rr_AverageAnnualReturnSinceInception 2.64%
Lazard Developing Markets Equity Portfolio | Open Shares  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.40%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.65%
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.05% [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 515
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 892
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,950
1 Year rr_AverageAnnualReturnYear01 14.31%
5 Years rr_AverageAnnualReturnYear05 (0.12%)
Life of Portfolio rr_AverageAnnualReturnSinceInception 3.01%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 30, 2008
Lazard Developing Markets Equity Portfolio | R6 Shares  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.23% [2]
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.23%
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets [1]
Total Annual Portfolio Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 1.23% [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 $ 125
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 390
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 676
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,489
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess Returns shown below for the Portfolio’s R6 Shares (which were not operational as of December 31, 2016) reflect the performance of the Portfolio’s Institutional Shares.
1 Year rr_AverageAnnualReturnYear01 14.81%
5 Years rr_AverageAnnualReturnYear05 0.22%
Life of Portfolio rr_AverageAnnualReturnSinceInception 3.33%
[1] Reflects a contractual agreement by the Investment Manager to waive its fee and, if necessary, reimburse the Portfolio until May 1, 2018, 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. 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 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.