Performance Management |
Dec. 31, 2025 |
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| Lazard Developing Markets Equity Portfolio | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance Bar Chart and Table | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | 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 has varied from year to year over the past 10 calendar years. Updated performance information is available at www.lazardassetmanagement.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. |
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| Performance Past Does Not Indicate Future [Text] | 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 has varied from year to year over the past 10 calendar years. Updated performance information is available at www.lazardassetmanagement.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] | 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. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Year-by-Year Total Returns for Institutional Shares As of December 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (for the periods ended December 31, 2025) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Narrative | 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, 2025) 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. |
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| Performance Table Uses Highest Federal Rate | 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 | 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] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table One Class of after Tax Shown [Text] | After-tax returns are shown only for Institutional Shares. After-tax returns of the Portfolio’s other share classes will vary. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Index No Deduction for Fees, Expenses, or Taxes [Text] | MSCI Emerging Markets Index(reflects no deduction for fees, expenses or taxes) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Website Address [Text] | www.lazardassetmanagement.com | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Phone [Text] | (800) 823-6300 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard Developing Markets Equity Portfolio | Institutional | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 24.47% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Jun. 30, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (28.66%) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard Emerging Markets Equity Portfolio | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance Bar Chart and Table | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard Emerging 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 has varied from year to year over the past 10 calendar years. Updated performance information is available at www.lazardassetmanagement.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. |
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| Performance Past Does Not Indicate Future [Text] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard Emerging 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 has varied from year to year over the past 10 calendar years. Updated performance information is available at www.lazardassetmanagement.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] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard Emerging 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. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Year-by-Year Total Returns for Institutional Shares As of December 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (for the periods ended December 31, 2025) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Narrative | 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. |
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| Performance Table Uses Highest Federal Rate | 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 | 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] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table One Class of after Tax Shown [Text] | After-tax returns are shown only for Institutional Shares. After-tax returns of the Portfolio’s other share classes will vary. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Index No Deduction for Fees, Expenses, or Taxes [Text] | MSCI Emerging Markets Index(reflects no deduction for fees, expenses or taxes) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Website Address [Text] | www.lazardassetmanagement.com | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Phone [Text] | (800) 823-6300 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard Emerging Markets Equity Portfolio | Institutional | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 23.97% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Dec. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (30.09%) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard Emerging Markets Equity Advantage Portfolio | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance Bar Chart and Table | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard Emerging Markets Equity Advantage 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 has varied from year to year over the past 10 calendar years. Updated performance information is available at www.lazardassetmanagement.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. |
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| Performance Past Does Not Indicate Future [Text] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard Emerging Markets Equity Advantage 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 has varied from year to year over the past 10 calendar years. Updated performance information is available at www.lazardassetmanagement.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] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard Emerging Markets Equity Advantage 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. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Year-by-Year Total Returns for Institutional Shares As of December 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (for the periods ended December 31, 2025) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Narrative | 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. |
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| Performance Table Uses Highest Federal Rate | 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 | 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] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table One Class of after Tax Shown [Text] | After-tax returns are shown only for Institutional Shares. After-tax returns of the Portfolio’s other share classes will vary. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Index No Deduction for Fees, Expenses, or Taxes [Text] | MSCI Emerging Markets Index(reflects no deduction for fees, expenses or taxes) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Website Address [Text] | www.lazardassetmanagement.com | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Phone [Text] | (800) 823-6300 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard Emerging Markets Equity Advantage Portfolio | Institutional | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 17.93% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Dec. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (23.63%) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard Enhanced Opportunities Portfolio | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance Bar Chart and Table | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard Enhanced Opportunities 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 and an index that is generally more representative of the types of market sectors and/or types of investments in which the Portfolio invests. The bar chart shows how the performance of the Portfolio’s Institutional Shares has varied from year to year over the past 10 calendar years. Updated performance information is available at www.lazardassetmanagement.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. |
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| Performance Past Does Not Indicate Future [Text] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard Enhanced Opportunities 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 and an index that is generally more representative of the types of market sectors and/or types of investments in which the Portfolio invests. The bar chart shows how the performance of the Portfolio’s Institutional Shares has varied from year to year over the past 10 calendar years. Updated performance information is available at www.lazardassetmanagement.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. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Year-by-Year Total Returns for Institutional Shares As of December 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (for the periods ended December 31, 2025) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Narrative | 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, 2025) 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. |
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| Performance Table Uses Highest Federal Rate | 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 | 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] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table One Class of after Tax Shown [Text] | After-tax returns are shown only for Institutional Shares. After-tax returns of the Portfolio’s other share classes will vary. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Index No Deduction for Fees, Expenses, or Taxes [Text] | Bloomberg US Universal Index(reflects no deduction for fees, expenses or taxes) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Website Address [Text] | www.lazardassetmanagement.com | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Phone [Text] | (800) 823-6300 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard Enhanced Opportunities Portfolio | Institutional | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 6.57% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Dec. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (7.13%) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard Equity Franchise Portfolio | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance Bar Chart and Table | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard Equity Franchise 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 has varied from year to year. Updated performance information is available at www.lazardassetmanagement.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. |
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| Performance Past Does Not Indicate Future [Text] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard Equity Franchise 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 has varied from year to year. Updated performance information is available at www.lazardassetmanagement.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] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard Equity Franchise 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. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Year-by-Year Total Returns for Institutional Shares As of December 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (for the periods ended December 31, 2025) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Narrative | 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, 2025) 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. |
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| Performance Table Uses Highest Federal Rate | 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 | 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] |
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| Performance Table One Class of after Tax Shown [Text] | After-tax returns are shown only for Institutional Shares. After-tax returns of the Portfolio’s other share classes will vary. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Index No Deduction for Fees, Expenses, or Taxes [Text] | MSCI World Index(reflects no deduction for fees, expenses or taxes) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Website Address [Text] | www.lazardassetmanagement.com | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Phone [Text] | (800) 823-6300 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard Equity Franchise Portfolio | Institutional | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 21.99% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Dec. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (33.33%) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard Global Listed Infrastructure Portfolio | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance Bar Chart and Table | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard Global Listed Infrastructure 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 and an index that is generally more representative of the types of market sectors and/or types of investments in which the Portfolio invests. The bar chart shows how the performance of the Portfolio’s Institutional Shares has varied from year to year over the past 10 calendar years. Updated performance information is available at www.lazardassetmanagement.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. |
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| Performance Past Does Not Indicate Future [Text] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard Global Listed Infrastructure 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 and an index that is generally more representative of the types of market sectors and/or types of investments in which the Portfolio invests. The bar chart shows how the performance of the Portfolio’s Institutional Shares has varied from year to year over the past 10 calendar years. Updated performance information is available at www.lazardassetmanagement.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. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Year-by-Year Total Returns for Institutional Shares As of December 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (for the periods ended December 31, 2025) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Narrative | 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, 2025) 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. |
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| Performance Table Uses Highest Federal Rate | 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 | 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] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table One Class of after Tax Shown [Text] | After-tax returns are shown only for Institutional Shares. After-tax returns of the Portfolio’s other share classes will vary. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Index No Deduction for Fees, Expenses, or Taxes [Text] | MSCI World Index(reflects no deduction for fees, expenses or taxes) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Website Address [Text] | www.lazardassetmanagement.com | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Phone [Text] | (800) 823-6300 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard Global Listed Infrastructure Portfolio | Institutional | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 10.52% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Mar. 31, 2017 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (16.07%) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard Global Small Cap Equity Portfolio | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance Bar Chart and Table | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard Global Small Cap 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 and an index that is generally more representative of the types of market sectors and/or types of investments in which the Portfolio invests. The bar chart shows how the performance of the Portfolio’s Institutional Shares has varied from year to year over the past 10 calendar years. Effective September 1, 2025, certain changes were made to the Portfolio’s principal investments strategies, permitting investment of a significant amount of the Portfolio's net assets in U.S. securities in addition to non-U.S. securities. The Portfolio’s performance information prior to September 1, 2025 relates only to the Portfolio’s prior principal investment strategies. Updated performance information is available at www.lazardassetmanagement.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. |
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| Performance Past Does Not Indicate Future [Text] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard Global Small Cap 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 and an index that is generally more representative of the types of market sectors and/or types of investments in which the Portfolio invests. The bar chart shows how the performance of the Portfolio’s Institutional Shares has varied from year to year over the past 10 calendar years. Effective September 1, 2025, certain changes were made to the Portfolio’s principal investments strategies, permitting investment of a significant amount of the Portfolio's net assets in U.S. securities in addition to non-U.S. securities. The Portfolio’s performance information prior to September 1, 2025 relates only to the Portfolio’s prior principal investment strategies. Updated performance information is available at www.lazardassetmanagement.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. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Year-by-Year Total Returns for Institutional Shares As of December 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (for the periods ended December 31, 2025) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Narrative | 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, 2025) 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. |
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| Performance Table Uses Highest Federal Rate | 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 | 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] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table One Class of after Tax Shown [Text] | After-tax returns are shown only for Institutional Shares. After-tax returns of the Portfolio’s other share classes will vary. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Index No Deduction for Fees, Expenses, or Taxes [Text] | MSCI World Investable Market Index (IMI)(reflects no deduction for fees, expenses or taxes) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Website Address [Text] | www.lazardassetmanagement.com | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Phone [Text] | (800) 823-6300 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard Global Small Cap Equity Portfolio | Institutional | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 22.85% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Jun. 30, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (26.42%) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard Government Money Market Portfolio | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance Bar Chart and Table | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | Because the Portfolio did not have a full calendar year of performance 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 the changes in performance from year to year. Updated performance information is available at www.lazardassetmanagement.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. |
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| Performance Past Does Not Indicate Future [Text] | the Portfolio did not have a full calendar year of performance 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 the changes in performance from year to year. Updated performance information is available at www.lazardassetmanagement.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] | Annual performance returns provide some indication of the risks of investing in the Portfolio by showing the changes in performance from year to year. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance One Year or Less [Text] | Because the Portfolio did not have a full calendar year of performance prior to the date of this Prospectus, no performance returns are presented. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Website Address [Text] | www.lazardassetmanagement.com | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Phone [Text] | (800) 823-6300 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard International Equity Portfolio | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance Bar Chart and Table | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard International 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 has varied from year to year over the past 10 calendar years. Updated performance information is available at www.lazardassetmanagement.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. |
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| Performance Past Does Not Indicate Future [Text] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard International 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 has varied from year to year over the past 10 calendar years. Updated performance information is available at www.lazardassetmanagement.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] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard International 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. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Year-by-Year Total Returns for Institutional Shares As of December 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (for the periods ended December 31, 2025) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Narrative | 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. |
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| Performance Table Uses Highest Federal Rate | 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 | 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] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table One Class of after Tax Shown [Text] | After-tax returns are shown only for Institutional Shares. After-tax returns of the Portfolio’s other share classes will vary. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Index No Deduction for Fees, Expenses, or Taxes [Text] | MSCI EAFE Index (reflects no deduction for fees, expenses or taxes) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Website Address [Text] | www.lazardassetmanagement.com | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Phone [Text] | (800) 823-6300 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard International Equity Portfolio | Institutional | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 15.71% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Dec. 31, 2022 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (23.05%) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard International Equity Select Portfolio | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance Bar Chart and Table | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard International Equity Select 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 has varied from year to year over the past 10 calendar years. Updated performance information is available at www.lazardassetmanagement.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. |
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| Performance Past Does Not Indicate Future [Text] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard International Equity Select 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 has varied from year to year over the past 10 calendar years. Updated performance information is available at www.lazardassetmanagement.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] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard International Equity Select 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. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Year-by-Year Total Returns for Institutional Shares As of December 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (for the periods ended December 31, 2025) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Narrative | 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, 2025) 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. |
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| Performance Table Uses Highest Federal Rate | 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 | 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] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table One Class of after Tax Shown [Text] | After-tax returns are shown only for Institutional Shares. After-tax returns of the Portfolio’s other share classes will vary. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Index No Deduction for Fees, Expenses, or Taxes [Text] | MSCI ACWI ex-US Index(reflects no deduction for fees, expenses or taxes) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Website Address [Text] | www.lazardassetmanagement.com | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Phone [Text] | (800) 823-6300 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard International Equity Select Portfolio | Institutional | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 15.53% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Jun. 30, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (23.91%) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard International Quality Growth Portfolio | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance Bar Chart and Table | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard International Quality Growth 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 and an index that is generally more representative of the types of market sectors and/or types of investments in which the Portfolio invests. 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.lazardassetmanagement.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. |
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| Performance Past Does Not Indicate Future [Text] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard International Quality Growth 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 and an index that is generally more representative of the types of market sectors and/or types of investments in which the Portfolio invests. 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.lazardassetmanagement.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. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Year-by-Year Total Returns for Institutional Shares As of December 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (for the periods ended December 31, 2025) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Narrative | 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. |
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| Performance Table Uses Highest Federal Rate | 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 | 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] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table One Class of after Tax Shown [Text] | After-tax returns are shown only for Institutional Shares. After-tax returns of the Portfolio’s other share classes will vary. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Index No Deduction for Fees, Expenses, or Taxes [Text] | (reflects no deduction for fees, expenses or taxes) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Website Address [Text] | www.lazardassetmanagement.com | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Phone [Text] | (800) 823-6300 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard International Quality Growth Portfolio | Institutional | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 18.32% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Jun. 30, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (18.28%) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard International Strategic Equity Portfolio | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance Bar Chart and Table | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard International Strategic 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 has varied from year to year over the past 10 calendar years. Updated performance information is available at www.lazardassetmanagement.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. |
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| Performance Past Does Not Indicate Future [Text] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard International Strategic 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 has varied from year to year over the past 10 calendar years. Updated performance information is available at www.lazardassetmanagement.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] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard International Strategic 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. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Year-by-Year Total Returns for Institutional Shares As of December 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (for the periods ended December 31, 2025) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Narrative | 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. |
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| Performance Table Uses Highest Federal Rate | 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 | 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] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table One Class of after Tax Shown [Text] | After-tax returns are shown only for Institutional Shares. After-tax returns of the Portfolio’s other share classes will vary. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Index No Deduction for Fees, Expenses, or Taxes [Text] | MSCI EAFE Index (reflects no deduction for fees, expenses or taxes) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Website Address [Text] | www.lazardassetmanagement.com | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Phone [Text] | (800) 823-6300 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard International Strategic Equity Portfolio | Institutional | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 17.19% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Dec. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (23.80%) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard Opportunistic Strategies Portfolio | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance Bar Chart and Table | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard Opportunistic Strategies 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 and an index that is generally more representative of the types of market sectors and/or types of investments in which the Portfolio invests. The bar chart shows how the performance of the Portfolio’s Institutional Shares has varied from year to year over the past 10 calendar years. Updated performance information is available at www.lazardassetmanagement.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. |
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| Performance Past Does Not Indicate Future [Text] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard Opportunistic Strategies 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 and an index that is generally more representative of the types of market sectors and/or types of investments in which the Portfolio invests. The bar chart shows how the performance of the Portfolio’s Institutional Shares has varied from year to year over the past 10 calendar years. Updated performance information is available at www.lazardassetmanagement.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. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Year-by-Year Total Returns for Institutional Shares As of December 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (for the periods ended December 31, 2025) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Narrative | 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, 2025) 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. |
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| Performance Table Uses Highest Federal Rate | 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 | 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] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table One Class of after Tax Shown [Text] | After-tax returns are shown only for Institutional Shares. After-tax returns of the Portfolio’s other share classes will vary. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Index No Deduction for Fees, Expenses, or Taxes [Text] | MSCI World Index (reflects no deduction for fees, expenses or taxes) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Website Address [Text] | www.lazardassetmanagement.com | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Phone [Text] | (800) 823-6300 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard Opportunistic Strategies Portfolio | Institutional | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 13.58% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Jun. 30, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (12.77%) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Dec. 31, 2018 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard Real Assets Portfolio | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance Bar Chart and Table | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard Real Assets 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 and an index that is generally more representative of the types of market sectors and/or types of investments in which the Portfolio invests. The bar chart shows how the performance of the Portfolio’s Institutional Shares has varied from year to year. Effective September 1, 2020, certain changes were made to the Portfolio’s principal investments strategies, including removing inflation-indexed securities from its policy with respect to the investment of 80% of its assets. The Portfolio’s performance information prior to September 1, 2020 relates only to the Portfolio’s prior principal investment strategies. Updated performance information is available at www.lazardassetmanagement.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. |
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| Performance Past Does Not Indicate Future [Text] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard Real Assets 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 and an index that is generally more representative of the types of market sectors and/or types of investments in which the Portfolio invests. The bar chart shows how the performance of the Portfolio’s Institutional Shares has varied from year to year. Effective September 1, 2020, certain changes were made to the Portfolio’s principal investments strategies, including removing inflation-indexed securities from its policy with respect to the investment of 80% of its assets. The Portfolio’s performance information prior to September 1, 2020 relates only to the Portfolio’s prior principal investment strategies. Updated performance information is available at www.lazardassetmanagement.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. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Year-by-Year Total Returns for Institutional Shares As of December 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (for the periods ended December 31, 2025) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Narrative | 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. |
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| Performance Table Uses Highest Federal Rate | 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 | 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] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table One Class of after Tax Shown [Text] | After-tax returns are shown only for Institutional Shares. After-tax returns of the Portfolio’s other share classes will vary. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Index No Deduction for Fees, Expenses, or Taxes [Text] | (reflects no deduction for fees, expenses or taxes) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Website Address [Text] | www.lazardassetmanagement.com | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Phone [Text] | (800) 823-6300 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard Real Assets Portfolio | Institutional | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 10.67% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Sep. 30, 2024 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (15.79%) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard US Convertibles Portfolio | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance Bar Chart and Table | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard US Convertibles 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 and an index that is generally more representative of the types of market sectors and/or types of investments in which the Portfolio invests. 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.lazardassetmanagement.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. |
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| Performance Past Does Not Indicate Future [Text] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard US Convertibles 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 and an index that is generally more representative of the types of market sectors and/or types of investments in which the Portfolio invests. 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.lazardassetmanagement.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. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Year-by-Year Total Returns for Institutional Shares As of December 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (for the periods ended December 31, 2025) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Narrative | 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, 2025) 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. |
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| Performance Table Uses Highest Federal Rate | 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 | 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] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table One Class of after Tax Shown [Text] | After-tax returns are shown only for Institutional Shares. After-tax returns of the Portfolio’s other share classes will vary. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Index No Deduction for Fees, Expenses, or Taxes [Text] | Bloomberg US Universal Index(reflects no deduction for fees, expenses or taxes) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Website Address [Text] | www.lazardassetmanagement.com | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Phone [Text] | (800) 823-6300 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard US Convertibles Portfolio | Institutional | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 9.24% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Jun. 30, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (4.06%) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Sep. 30, 2023 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard US Equity Focus Portfolio | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance Bar Chart and Table | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard US Equity Focus 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 has varied from year to year over the past 10 calendar years. Updated performance information is available at www.lazardassetmanagement.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. |
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| Performance Past Does Not Indicate Future [Text] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard US Equity Focus 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 has varied from year to year over the past 10 calendar years. Updated performance information is available at www.lazardassetmanagement.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] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard US Equity Focus 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. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Year-by-Year Total Returns for Institutional Shares As of December 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (for the periods ended December 31, 2025) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Narrative | 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. |
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| Performance Table Uses Highest Federal Rate | 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 | 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] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table One Class of after Tax Shown [Text] | After-tax returns are shown only for Institutional Shares. After-tax returns of the Portfolio’s other share classes will vary. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Index No Deduction for Fees, Expenses, or Taxes [Text] | S&P 500 Index(reflects no deduction for fees, expenses or taxes) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Website Address [Text] | www.lazardassetmanagement.com | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Phone [Text] | (800) 823-6300 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard US Equity Focus Portfolio | Institutional | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 19.33% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Jun. 30, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (20.03%) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard US High Yield Portfolio | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance Bar Chart and Table | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard US High Yield 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 and an index that is generally more representative of the types of market sectors and/or types of investments in which the Portfolio invests. The bar chart shows how the performance of the Portfolio’s Institutional Shares has varied from year to year over the past 10 calendar years. Updated performance information is available at www.lazardassetmanagement.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. |
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| Performance Past Does Not Indicate Future [Text] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard US High Yield 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 and an index that is generally more representative of the types of market sectors and/or types of investments in which the Portfolio invests. The bar chart shows how the performance of the Portfolio’s Institutional Shares has varied from year to year over the past 10 calendar years. Updated performance information is available at www.lazardassetmanagement.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. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Year-by-Year Total Returns for Institutional Shares As of December 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (for the periods ended December 31, 2025) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Narrative | 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. |
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| Performance Table Uses Highest Federal Rate | 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 | 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] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table One Class of after Tax Shown [Text] | After-tax returns are shown only for Institutional Shares. After-tax returns of the Portfolio’s other share classes will vary. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Index No Deduction for Fees, Expenses, or Taxes [Text] | Bloomberg US Universal Index(reflects no deduction for fees, expenses or taxes) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Website Address [Text] | www.lazardassetmanagement.com | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Phone [Text] | (800) 823-6300 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard US High Yield Portfolio | Institutional | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 7.80% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Jun. 30, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (9.80%) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard US Short Duration Fixed Income Portfolio | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance Bar Chart and Table | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard US Short Duration Fixed Income 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 and an index that is generally more representative of the types of market sectors and/or types of investments in which the Portfolio invests. The bar chart shows how the performance of the Portfolio’s Institutional Shares has varied from year to year over the past 10 calendar years. Updated performance information is available at www.lazardassetmanagement.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. |
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| Performance Past Does Not Indicate Future [Text] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard US Short Duration Fixed Income 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 and an index that is generally more representative of the types of market sectors and/or types of investments in which the Portfolio invests. The bar chart shows how the performance of the Portfolio’s Institutional Shares has varied from year to year over the past 10 calendar years. Updated performance information is available at www.lazardassetmanagement.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. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Year-by-Year Total Returns for Institutional Shares As of December 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (for the periods ended December 31, 2025) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Narrative | 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, 2025) 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. |
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| Performance Table Uses Highest Federal Rate | 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 | 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] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table One Class of after Tax Shown [Text] | After-tax returns are shown only for Institutional Shares. After-tax returns of the Portfolio’s other share classes will vary. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Index No Deduction for Fees, Expenses, or Taxes [Text] | Bloomberg US Universal Index(reflects no deduction for fees, expenses or taxes) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Website Address [Text] | www.lazardassetmanagement.com | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Phone [Text] | (800) 823-6300 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard US Short Duration Fixed Income Portfolio | Institutional | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 3.11% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Sep. 30, 2024 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (1.62%) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2022 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard US Small Cap Equity Select Portfolio | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance Bar Chart and Table | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard US Small Cap Equity Select 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 and an index that is generally more representative of the types of market sectors and/or types of investments in which the Portfolio invests. The bar chart shows how the performance of the Portfolio’s Institutional Shares has varied from year to year over the past 10 calendar years. Effective September 1, 2023, certain changes were made to the Portfolio’s principal investments strategies, including removing mid-capitalization companies from its policy with respect to the investment of 80% of its assets. The Portfolio’s performance information prior to September 1, 2023 relates only to the Portfolio’s prior principal investment strategies. Updated performance information is available at www.lazardassetmanagement.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. |
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| Performance Past Does Not Indicate Future [Text] | The accompanying bar chart and table provide some indication of the risks of investing in Lazard US Small Cap Equity Select 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 and an index that is generally more representative of the types of market sectors and/or types of investments in which the Portfolio invests. The bar chart shows how the performance of the Portfolio’s Institutional Shares has varied from year to year over the past 10 calendar years. Effective September 1, 2023, certain changes were made to the Portfolio’s principal investments strategies, including removing mid-capitalization companies from its policy with respect to the investment of 80% of its assets. The Portfolio’s performance information prior to September 1, 2023 relates only to the Portfolio’s prior principal investment strategies. Updated performance information is available at www.lazardassetmanagement.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. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Year-by-Year Total Returns for Institutional Shares As of December 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (for the periods ended December 31, 2025) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Narrative | 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. |
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| Performance Table Uses Highest Federal Rate | 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 | 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] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table One Class of after Tax Shown [Text] | After-tax returns are shown only for Institutional Shares. After-tax returns of the Portfolio’s other share classes will vary. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Index No Deduction for Fees, Expenses, or Taxes [Text] | Russell 3000 Index(reflects no deduction for fees, expenses or taxes) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Website Address [Text] | www.lazardassetmanagement.com | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Availability Phone [Text] | (800) 823-6300 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lazard US Small Cap Equity Select Portfolio | Institutional | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 23.67% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Dec. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (31.16%) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||