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Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Lazard U.S. Municipal Portfolio
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Portfolio seeks current income exempt from regular federal income taxes, consistent with preservation of capital.

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 Transaction 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 2014-04-30
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 most recent fiscal year, the Portfolio’s portfolio turnover rate was 77% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 77.00%
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 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

Under normal circumstances, the Portfolio invests at least 80% of its assets in US municipal securities, the interest on which is, in the opinion of the issuer’s counsel at the time of issuance, exempt from regular federal income tax. At times, a portion of the Portfolio’s assets exempt from regular income tax may be invested in securities subject to the alternative minimum tax (the “AMT”).


The Portfolio invests primarily in securities that are rated investment grade by one or more nationally recognized statistical rating organizations, or, if unrated, determined by the Investment Manager to be of comparable quality.


Although the Portfolio may invest in fixed-income securities without regard to their maturity or duration, the Portfolio’s average weighted effective duration is expected to range between two and seven years.


The Portfolio also may invest in other securities that are not municipal securities. The Portfolio’s investments may include any type of debt instrument, including, for example, zero-coupon securities as well as floating- and variable-rate securities.


Securities are evaluated based on their fundamental and structural characteristics. Valuation analysis is tailored to the specific asset class, but may include credit research, prepayment or call options, maturity, duration and coupon or other features.

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.


Fixed-Income Securities Risk. While fixed-income securities are designed to produce a stable stream of income, their prices move inversely with changes in interest rates. Interest rate risk is usually greater for fixed-income securities with longer maturities or effective durations.


Municipal Securities Risk. A primary risk of municipal securities, like other fixed-income securities, is credit risk, which is the risk that the issuer will not make timely interest or principal payments. Payment by the issuer may depend on a relatively limited source of revenue, resulting in greater credit risk.


The values of municipal securities can fluctuate and may be affected by adverse tax law, legislative or political changes, and by financial or other developments affecting municipal issuers and the municipal securities market generally. If there is a decline, or perceived decline, in the credit quality of a municipal security (or institutions providing credit and liquidity enhancements), the security’s value could fall, potentially lowering the Portfolio’s share price.


Some municipal securities may give the issuer the option to call, or redeem, the securities before their maturity, and, during a time of declining interest rates, the Portfolio may have to reinvest the proceeds in an investment offering a lower yield (and the Portfolio may not benefit from any increase in the value of its portfolio holdings as a result of declining interest rates).


Future changes in the activity of an issuer may adversely affect the tax-exempt status of municipal securities. If a municipal security fails to meet certain regulatory requirements to maintain its exempt tax status, the interest received by the Portfolio from its investment in such security, and the related distributions to Portfolio shareholders, will be taxable.


The size of certain municipal securities offerings may be relatively smaller in size than other debt offerings and, in some cases, the Portfolio, by itself or together with 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.


Liquidity Risk. The lack of a readily available market or restrictions on resale may limit the ability of the Portfolio to sell a security at the time and price it would like.

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 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 US Municipal Portfolio by showing the Portfolio’s performance for the first complete calendar year of operation compared to that of a broad measure of market performance. The bar chart shows the performance of the Portfolio’s Institutional Shares. 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 US Municipal Portfolio by showing the Portfolio's performance for the first complete calendar year of operation 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:
6/30/12 1.22%

Worst Quarter:
12/31/12 -0.02%

Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2012
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 1.22%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2012
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (0.02%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the periods ended December 31, 2012)
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 Narrative rr_PerformanceTableNarrativeTextBlock

After-tax returns for the Open Shares vary from those of Institutional Shares. 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.

Bank of America Merrill Lynch 1-10 Year Municipal Bond Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.98%
Life of Portfolio rr_AverageAnnualReturnSinceInception 4.92%
Institutional Shares
  
Risk/Return: rr_RiskReturnAbstract  
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Management Fees rr_ManagementFeesOverAssets 0.25%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 1.16%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.41%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.01%) [1]
Total Annual Portfolio Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 0.40% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 41
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 347
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 675
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,603
Annual Return 2012 rr_AnnualReturn2012 2.54%
1 Year rr_AverageAnnualReturnYear01 2.54%
Life of Portfolio rr_AverageAnnualReturnSinceInception 3.81%
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 28, 2011
Institutional Shares | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.93%
Life of Portfolio rr_AverageAnnualReturnSinceInception 3.10%
Institutional Shares | After Taxes on Distributions and Sale of Portfolio Shares
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.66%
Life of Portfolio rr_AverageAnnualReturnSinceInception 2.86%
Open Shares
  
Risk/Return: rr_RiskReturnAbstract  
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Management Fees rr_ManagementFeesOverAssets 0.25%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 37.61%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 38.11%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (37.41%) [1]
Total Annual Portfolio Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 0.70% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 72
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 5,607
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 8,084
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 9,821
1 Year rr_AverageAnnualReturnYear01 2.24%
Life of Portfolio rr_AverageAnnualReturnSinceInception 3.49%
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 28, 2011
[1] Reflects a contractual agreement by the Investment Manager to waive its fee and, if necessary, reimburse the Portfolio through April 30, 2014, to the extent Total Annual Portfolio Operating Expenses exceed .40% and .70% of the average daily net assets of the Portfolio's Institutional Shares and Open 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.