Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

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Lazard Managed Equity Volatility Portfolio

Objective [Heading]

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Investment Objective

Objective, Primary [Text Block]

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The Portfolio seeks long-term 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

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

2017-05-29

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. Because the Portfolio had not commenced investment operations prior to the date of this Prospectus, no portfolio turnover information is presented.

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

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“Other Expenses” are based on estimated amounts for the current fiscal year.

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 equity securities, principally common stocks, of US and non-US companies. In managing the Portfolio, the Investment Manager utilizes a quantitatively driven, bottom up stock selection process. A principal component of the Investment Manager’s investment process for the Portfolio is volatility management. Volatility, a risk measurement, measures the magnitude of fluctuations in the value of a financial instrument or index over time. The Investment Manager seeks to generate attractive risk-adjusted returns while lowering portfolio volatility by using a benchmark-unaware stock selection strategy driven by fundamental inputs that is intended to identify high quality companies with sustainable operating performance. The Investment Manager performs an independent assessment of stock risk and also seeks to manage risk through diversification.

The Portfolio management team selects investments for the Portfolio from a broad investment universe of stocks and depositary receipts, including ADRs, GDRs and EDRs, REITs, warrants and rights. The active, quantitative approach utilized by the Portfolio management team involves initial screening, risk assessment and evaluation of each company relative to its global peers. The Portfolio will typically focus on securities of developed market companies, using an objective, systematic investment process that blends both risk and stock ranking assessments designed to capture attractive risk-to-return characteristics and create a low volatility portfolio. In addition to a multidimensional assessment of risk, each company is evaluated daily according to four independent measures: growth, value, sentiment and quality. The Portfolio may invest across the capitalization spectrum.

Under normal circumstances, the Portfolio invests at least 80% of its assets in equity securities.

The Portfolio may invest in ETFs and similar products, which generally pursue a passive index-based strategy.

Risk [Heading]

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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.

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.

Quantitative Model Risk. The success of the Portfolio’s investment strategy depends largely upon the effectiveness of the Investment Manager’s quantitative model. A quantitative model, such as the risk and other models used by the Investment Manager requires adherence to a systematic, disciplined process. The Investment Manager’s ability to monitor and, if necessary, adjust its quantitative model could be adversely affected by various factors including incorrect or outdated market and other data inputs. Factors that affect a security’s value can change over time, and these changes may not be reflected in the quantitative model. In addition, factors used in quantitative analysis and the weight placed on those factors may not be predictive of a security’s value.

Volatility Management Risk. While the Investment Manager generally will seek to achieve, over a full market cycle, the level of volatility in the Portfolio’s performance as described above, there can be no guarantee that this will be achieved; actual or realized volatility for any particular period may be materially higher or lower depending on market conditions. In addition, the Investment Manager’s efforts to manage the Portfolio’s volatility can be expected, in a period of generally positive equity market returns, to reduce the Portfolio’s performance below what could be achieved without seeking to manage volatility and, thus, the Portfolio would generally be expected to underperform market indices that do not seek to achieve a specified level of volatility.

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.

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 Investment Manager does not intend to actively hedge the Portfolio’s foreign currency exposure. Currency investments could be adversely affected by delays in, or a refusal to grant, repatriation of funds or conversion of emerging market currencies.

ETF Risk. Shares of ETFs may trade at prices that vary from their NAVs, sometimes significantly. The shares of ETFs may trade at prices at, below or above their most recent NAV. In addition, the performance of an ETF pursuing a passive index-based strategy may diverge from the performance of the index. The Portfolio’s investments in ETFs are subject to the risks of such ETF’s investments, as well as to the general risks of investing in ETFs. Portfolio shares will bear not only the Portfolio’s management fees and operating expenses, but also their proportional share of the management fees and operating expenses of the ETFs in which the Portfolio invests. The Portfolio may be limited by the 1940 Act in the amount of its assets that may be invested in ETFs and unless an ETF has received an exemptive order from the Securities and Exchange Commission on which the Portfolio may rely or an exemption is available.

Other Equity Securities Risk. Investments in rights and warrants involve certain risks including the possible lack of a liquid market for resale, price fluctuations and the failure of the price of the underlying security to reach a level at which the right or warrant can be prudently exercised, in which case the right or warrant may expire without being exercised and result in a loss of a Portfolio’s entire investment.

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]

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

Bar Chart and Performance Table [Heading]

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Performance Bar Chart and Table

Performance Narrative [Text Block]

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Because the Portfolio had not commenced investment operations prior to 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. After the Portfolio commences investment operations performance information will be 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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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]

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Because the Portfolio had not commenced investment operations prior to the date of this Prospectus, no performance returns are presented.

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.

Institutional Shares

Risk/Return:

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Redemption Fee (as a percentage of Amount Redeemed)

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(1.00%)

Management Fees

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0.60%

Distribution and Service (12b-1) Fees

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none

Other Expenses

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0.32%

^[1]

Total Annual Portfolio Operating Expenses

rr_ExpensesOverAssets

0.92%

Fee Waiver or Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.17%)

^[2]

Total Annual Portfolio Operating Expenses After Fee Waiver and Expense Reimbursement

rr_NetExpensesOverAssets

0.75%

^[2]

Expense Example, with Redemption, 1 Year

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77

Expense Example, with Redemption, 3 Years

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258

Open Shares

Risk/Return:

rr_RiskReturnAbstract

Redemption Fee (as a percentage of Amount Redeemed)

rr_RedemptionFeeOverRedemption

(1.00%)

Management Fees

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0.60%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

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0.37%

^[1]

Total Annual Portfolio Operating Expenses

rr_ExpensesOverAssets

1.22%

Fee Waiver or Reimbursement

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(0.17%)

^[2]

Total Annual Portfolio Operating Expenses After Fee Waiver and Expense Reimbursement

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1.05%

^[2]

Expense Example, with Redemption, 1 Year

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107

Expense Example, with Redemption, 3 Years

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353

R6 Shares

Risk/Return:

rr_RiskReturnAbstract

Redemption Fee (as a percentage of Amount Redeemed)

rr_RedemptionFeeOverRedemption

(1.00%)

Management Fees

rr_ManagementFeesOverAssets

0.60%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.32%

^[1]

Total Annual Portfolio Operating Expenses

rr_ExpensesOverAssets

0.92%

Fee Waiver or Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.22%)

^[2]

Total Annual Portfolio Operating Expenses After Fee Waiver and Expense Reimbursement

rr_NetExpensesOverAssets

0.70%

^[2]

Expense Example, with Redemption, 1 Year

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72

Expense Example, with Redemption, 3 Years

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248

[1] "Other Expenses" are based on estimated amounts for the current fiscal year.

[2] Reflects a contractual agreement by the Investment Manager to waive its fee and, if necessary, reimburse the Portfolio through May 29, 2017 to the extent Total Annual Portfolio Operating Expenses exceed .75%, 1.05% and .70% 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.