v3.26.1
Performance Management
Dec. 31, 2025
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.

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]
  

Best Quarter:

 

2020, Q2

24.47%

 

 

Worst Quarter:

2020, Q1

-28.66%

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.

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]
Average Annual Total Returns - Lazard Developing Markets Equity Portfolio
12 Months Ended 60 Months Ended 120 Months Ended 207 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
MSCI Emerging Markets Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] MSCI Emerging Markets Index (reflects no deduction for fees, expenses or taxes)        
MSCI Emerging Markets Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   33.57% 4.20% 8.42%  
Institutional | Average Annual Return, Percent   33.66% 1.69% 7.91%  
Institutional | Performance Inception Date         Sep. 30, 2008
Institutional | After Taxes on Distributions | Average Annual Return, Percent   33.01% 1.58% 7.85%  
Institutional | After Taxes on Distributions and Sales | Average Annual Return, Percent   19.91% 1.42% 6.58%  
Open | Average Annual Return, Percent   33.30% 1.44% 7.58%  
Open | Performance Inception Date         Sep. 30, 2008
R6 | Average Annual Return, Percent   33.66% 1.69% 7.91%  
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.

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]
  

Best Quarter:

 

2020, Q4

23.97%

 

 

Worst Quarter:

2020, Q1

-30.09%

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.

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]
Average Annual Total Returns - Lazard Emerging Markets Equity Portfolio
12 Months Ended 60 Months Ended 120 Months Ended 131 Months Ended 348 Months Ended 378 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
MSCI Emerging Markets Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] MSCI Emerging Markets Index (reflects no deduction for fees, expenses or taxes)            
MSCI Emerging Markets Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   33.57% 4.20% 8.42%      
Institutional | Average Annual Return, Percent   41.33% 10.80% 9.55%      
Institutional | Performance Inception Date             Jul. 15, 1994
Institutional | After Taxes on Distributions | Average Annual Return, Percent   40.16% 10.11% 9.15%      
Institutional | After Taxes on Distributions and Sales | Average Annual Return, Percent   24.46% 8.62% 8.00%      
Open | Average Annual Return, Percent   41.02% 10.52% 9.27%      
Open | Performance Inception Date           Jan. 08, 1997  
R6 | Average Annual Return, Percent   41.37% 10.81% 9.56%      
R6 | Performance Inception Date         Jan. 19, 2015    
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.

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]
  

Best Quarter:

 

2020, Q4

17.93%

 

 

Worst Quarter:

2020, Q1

-23.63%

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.

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]
Average Annual Total Returns - Lazard Emerging Markets Equity Advantage Portfolio
12 Months Ended 34 Months Ended 60 Months Ended 120 Months Ended 127 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
MSCI Emerging Markets Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] MSCI Emerging Markets Index (reflects no deduction for fees, expenses or taxes)          
MSCI Emerging Markets Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   33.57%   4.20% 8.42%  
Institutional | Average Annual Return, Percent   33.72%   6.00% 9.51%  
Institutional | Performance Inception Date           May 29, 2015
Institutional | After Taxes on Distributions | Average Annual Return, Percent   32.90%   5.21% 9.03%  
Institutional | After Taxes on Distributions and Sales | Average Annual Return, Percent   20.17%   4.54% 7.82%  
Open | Average Annual Return, Percent   33.25%   5.70% 9.20%  
Open | Performance Inception Date           May 29, 2015
R6 | Average Annual Return, Percent   33.63%        
R6 | Performance Inception Date     Feb. 22, 2023      
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.

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]
  

Best Quarter:

 

2020, Q4

6.57%

 

 

Worst Quarter:

2020, Q1

-7.13%

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.

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]
Average Annual Total Returns - Lazard Enhanced Opportunities Portfolio
12 Months Ended 60 Months Ended 120 Months Ended 132 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Bloomberg US Universal Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] Bloomberg US Universal Index (reflects no deduction for fees, expenses or taxes)        
Bloomberg US Universal Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   7.58% 0.06% 2.44%  
HFRX Global Hedge Fund Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] HFRX Global Hedge Fund Index (reflects no deduction for fees, expenses or taxes)        
HFRX Global Hedge Fund Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   7.14% 2.87% 3.08%  
Institutional | Average Annual Return, Percent   10.82% 5.43% 5.25%  
Institutional | Performance Inception Date         Dec. 31, 2014
Institutional | After Taxes on Distributions | Average Annual Return, Percent   10.51% 3.54% 3.39%  
Institutional | After Taxes on Distributions and Sales | Average Annual Return, Percent   6.40% 3.33% 3.23%  
Open | Average Annual Return, Percent   10.90% 5.27% 5.04%  
Open | Performance Inception Date         Dec. 31, 2014
R6 | Average Annual Return, Percent   10.82% 5.43% 5.25%  
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.

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]
  

Best Quarter:

 

2020, Q4

21.99%

 

 

Worst Quarter:

2020, Q1

-33.33%

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.

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]
Average Annual Total Returns - Lazard Equity Franchise Portfolio
12 Months Ended 60 Months Ended 99 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
MSCI World Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] MSCI World Index (reflects no deduction for fees, expenses or taxes)      
MSCI World Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   21.09% 12.15% 11.90%
Institutional | Average Annual Return, Percent   4.07% 6.84% 6.60%
Institutional | Performance Inception Date       Sep. 29, 2017
Institutional | After Taxes on Distributions | Average Annual Return, Percent   (3.30%) 2.28% 3.09%
Institutional | After Taxes on Distributions and Sales | Average Annual Return, Percent   2.51% 3.94% 4.04%
Open | Average Annual Return, Percent   3.70% 6.55% 6.32%
Open | Performance Inception Date       Sep. 29, 2017
R6 | Average Annual Return, Percent   4.07% 6.84% 6.60%
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.

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]
  

Best Quarter:

 

2017, Q1

10.52%

 

 

Worst Quarter:

2020, Q1

-16.07%

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.

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]
Average Annual Total Returns - Lazard Global Listed Infrastructure Portfolio
12 Months Ended 60 Months Ended 120 Months Ended 192 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
MSCI World Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] MSCI World Index (reflects no deduction for fees, expenses or taxes)        
MSCI World Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   21.09% 12.15% 12.17%  
MSCI World Core Infrastructure (Hedged) Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] MSCI World Core Infrastructure (Hedged) Index (reflects no deduction for fees, expenses or taxes)        
MSCI World Core Infrastructure (Hedged) Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   13.41% 8.35% 9.13%  
Institutional | Average Annual Return, Percent   23.86% 11.64% 9.92%  
Institutional | Performance Inception Date         Dec. 31, 2009
Institutional | After Taxes on Distributions | Average Annual Return, Percent   21.25% 9.67% 8.23%  
Institutional | After Taxes on Distributions and Sales | Average Annual Return, Percent   14.56% 8.70% 7.64%  
Open | Average Annual Return, Percent   23.53% 11.35% 9.63%  
Open | Performance Inception Date         Dec. 31, 2009
R6 | Average Annual Return, Percent   23.86% 11.64% 9.92%  
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.

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]
  

Best Quarter:

 

2020, Q2

22.85%

 

 

Worst Quarter:

2020, Q1

-26.42%

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.

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]
Average Annual Total Returns - Lazard Global Small Cap Equity Portfolio
12 Months Ended 60 Months Ended 120 Months Ended 347 Months Ended 385 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
MSCI World Investable Market Index (IMI)(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] MSCI World Investable Market Index (IMI) (reflects no deduction for fees, expenses or taxes)          
MSCI World Investable Market Index (IMI)(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   20.98% 11.58% 11.86%    
MSCI EAFE/World Small Cap Linked Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] MSCI EAFE/World Small Cap Linked Index (reflects no deduction for fees, expenses or taxes)          
MSCI EAFE/World Small Cap Linked Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   32.53% 5.73% 7.55%    
MSCI EAFE Investable Market Index (IMI)(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] MSCI EAFE Investable Market Index (IMI) (reflects no deduction for fees, expenses or taxes)          
MSCI EAFE Investable Market Index (IMI)(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   31.33% 8.44% 8.08%    
Institutional | Average Annual Return, Percent   35.93% 3.77% 5.34%    
Institutional | Performance Inception Date           Dec. 01, 1993
Institutional | After Taxes on Distributions | Average Annual Return, Percent   34.88% 1.88% 4.10%    
Institutional | After Taxes on Distributions and Sales | Average Annual Return, Percent   21.27% 2.77% 4.13%    
Open | Average Annual Return, Percent   35.58% 3.52% 5.07%    
Open | Performance Inception Date         Feb. 13, 1997  
R6 | Average Annual Return, Percent   35.93% 3.77% 5.34%    
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.

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.

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]
  

Best Quarter:

 

2022, Q4

15.71%

 

 

Worst Quarter:

2020, Q1

-23.05%

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.

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]
Average Annual Total Returns - Lazard International Equity Portfolio
12 Months Ended 60 Months Ended 120 Months Ended 129 Months Ended 347 Months Ended 410 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
MSCI EAFE Index (reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] MSCI EAFE Index (reflects no deduction for fees, expenses or taxes)            
MSCI EAFE Index (reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   31.22% 8.92% 8.18%      
Institutional | Average Annual Return, Percent   34.12% 8.35% 7.18%      
Institutional | Performance Inception Date             Oct. 29, 1991
Institutional | After Taxes on Distributions | Average Annual Return, Percent   29.82% 5.95% 5.77%      
Institutional | After Taxes on Distributions and Sales | Average Annual Return, Percent   21.95% 6.06% 5.55%      
Open | Average Annual Return, Percent   33.78% 8.08% 6.90%      
Open | Performance Inception Date           Jan. 23, 1997  
R6 | Average Annual Return, Percent   34.10% 8.38% 7.20%      
R6 | Performance Inception Date         Apr. 01, 2015    
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.

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]
  

Best Quarter:

 

2020, Q2

15.53%

 

 

Worst Quarter:

2020, Q1

-23.91%

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.

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]
Average Annual Total Returns - Lazard International Equity Select Portfolio
12 Months Ended 60 Months Ended 120 Months Ended 295 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
MSCI ACWI ex-US Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] MSCI ACWI ex-US Index (reflects no deduction for fees, expenses or taxes)        
MSCI ACWI ex-US Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   32.39% 7.91% 8.41%  
Institutional | Average Annual Return, Percent   24.69% 4.47% 5.81%  
Institutional | Performance Inception Date         May 31, 2001
Institutional | After Taxes on Distributions | Average Annual Return, Percent   23.51% 4.01% 5.50%  
Institutional | After Taxes on Distributions and Sales | Average Annual Return, Percent   14.68% 3.49% 4.74%  
Open | Average Annual Return, Percent   24.34% 4.21% 5.51%  
Open | Performance Inception Date         May 31, 2001
R6 | Average Annual Return, Percent   24.69% 4.47% 5.81%  
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.

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]
  

Best Quarter:

 

2020, Q2

18.32%

 

 

Worst Quarter:

2020, Q1

-18.28%

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.

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]
Average Annual Total Returns - Lazard International Quality Growth Portfolio
12 Months Ended 34 Months Ended 60 Months Ended 84 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
MSCI All Country World ex-US Index | Average Annual Return, Label [Optional Text] MSCI All Country World ex-US Index        
MSCI All Country World ex-US Index | Average Annual Return, Percent   32.39%   7.91% 10.15%
MSCI All Country World ex-US Index | Performance Inception Date         Dec. 31, 2018
MSCI All Country World ex-US Index | Average Annual Return, Percent     16.14%    
MSCI All Country World ex-US Index | Performance Inception Date     Feb. 22, 2023    
MSCI All Country World ex-US Growth Index | Average Annual Return, Label [Optional Text] MSCI All Country World ex-US Growth Index        
MSCI All Country World ex-US Growth Index | Average Annual Return, Percent   25.65%   4.01% 9.56%
MSCI All Country World ex-US Growth Index | Performance Inception Date         Dec. 31, 2018
MSCI All Country World ex-US Growth Index | Average Annual Return, Percent     13.41%    
MSCI All Country World ex-US Growth Index | Performance Inception Date     Feb. 22, 2023    
Institutional | Average Annual Return, Percent   11.69%   4.08% 10.16%
Institutional | Performance Inception Date         Dec. 31, 2018
Institutional | After Taxes on Distributions | Average Annual Return, Percent   10.42%   3.57% 9.65%
Institutional | After Taxes on Distributions and Sales | Average Annual Return, Percent   7.55%   3.15% 8.18%
Open | Average Annual Return, Percent   11.34%   3.81% 9.87%
Open | Performance Inception Date         Dec. 31, 2018
R6 | Average Annual Return, Percent   11.80% 10.26%    
R6 | Performance Inception Date     Feb. 22, 2023    
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.

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]
  

Best Quarter:

 

2020, Q4

17.19%

 

 

Worst Quarter:

2020, Q1

-23.80%

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.

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]
Average Annual Total Returns - Lazard International Strategic Equity Portfolio
12 Months Ended 60 Months Ended 120 Months Ended 131 Months Ended 239 Months Ended 242 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
MSCI EAFE Index (reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] MSCI EAFE Index (reflects no deduction for fees, expenses or taxes)            
MSCI EAFE Index (reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   31.22% 8.92% 8.18%      
Institutional | Average Annual Return, Percent   25.54% 5.01% 6.44%      
Institutional | Performance Inception Date             Oct. 31, 2005
Institutional | After Taxes on Distributions | Average Annual Return, Percent   17.56% 2.66% 4.97%      
Institutional | After Taxes on Distributions and Sales | Average Annual Return, Percent   18.72% 3.60% 5.01%      
Open | Average Annual Return, Percent   25.31% 4.74% 6.16%      
Open | Performance Inception Date           Feb. 03, 2006  
R6 | Average Annual Return, Percent   25.50% 5.01% 6.43%      
R6 | Performance Inception Date         Jan. 19, 2015    
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.

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]
  

Best Quarter:

 

2020, Q2

13.58%

 

 

Worst Quarter:

2018, Q4

-12.77%

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.

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]
Average Annual Total Returns - Lazard Opportunistic Strategies Portfolio
12 Months Ended 60 Months Ended 120 Months Ended 213 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
MSCI World Index (reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] MSCI World Index (reflects no deduction for fees, expenses or taxes)          
MSCI World Index (reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   21.09% 12.15% 12.17%    
Global Asset Allocation Blended Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] Global Asset Allocation Blended Index (reflects no deduction for fees, expenses or taxes)          
Global Asset Allocation Blended Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   15.57% 6.97% 8.22%    
Institutional | Average Annual Return, Percent   14.01% 6.29% 6.35%    
Institutional | Performance Inception Date           Mar. 26, 2008
Institutional | After Taxes on Distributions | Average Annual Return, Percent   9.93% 4.39% 4.76%    
Institutional | After Taxes on Distributions and Sales | Average Annual Return, Percent   10.18% 4.57% 4.62%    
Open | Average Annual Return, Percent   13.72% 6.01% 6.08%    
Open | Performance Inception Date         Mar. 31, 2008  
R6 | Average Annual Return, Percent   14.01% 6.29% 6.35%    
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.

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]
  

Best Quarter:

 

2024, Q3

10.67%

 

 

Worst Quarter:

2020, Q1

-15.79%

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.

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]
Average Annual Total Returns - Lazard Real Assets Portfolio
12 Months Ended 41 Months Ended 60 Months Ended 108 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
MSCI World Index | Average Annual Return, Label [Optional Text] MSCI World Index          
MSCI World Index | Average Annual Return, Percent   21.09%   12.15% 12.70%  
MSCI World Index | Performance Inception Date         Dec. 30, 2016  
MSCI World Index | Average Annual Return, Percent           12.54%
MSCI World Index | Performance Inception Date           Jan. 09, 2017
MSCI World Index | Average Annual Return, Percent     17.83%      
MSCI World Index | Performance Inception Date     Jul. 22, 2022      
Real Assets Blend Index | Average Annual Return, Label [Optional Text] Real Assets Blend Index          
Real Assets Blend Index | Average Annual Return, Percent   14.31%   7.23% 6.09%  
Real Assets Blend Index | Performance Inception Date         Dec. 30, 2016  
Real Assets Blend Index | Average Annual Return, Percent           6.07%
Real Assets Blend Index | Performance Inception Date           Jan. 09, 2017
Real Assets Blend Index | Average Annual Return, Percent     4.88%      
Real Assets Blend Index | Performance Inception Date     Jul. 22, 2022      
Institutional | Average Annual Return, Percent   16.80%   7.54% 6.11%  
Institutional | Performance Inception Date         Dec. 30, 2016  
Institutional | After Taxes on Distributions | Average Annual Return, Percent   13.05%   4.94% 4.24%  
Institutional | After Taxes on Distributions and Sales | Average Annual Return, Percent   9.85%   4.77% 4.08%  
Open | Average Annual Return, Percent   16.44%   7.25%   5.82%
Open | Performance Inception Date           Jan. 09, 2017
R6 | Average Annual Return, Percent   16.72% 5.86%      
R6 | Performance Inception Date     Jul. 22, 2022      
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.

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]
  

Best Quarter:

 

2025, Q2

9.24%

 

 

Worst Quarter:

2023, Q3

-4.06%

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.

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]
Average Annual Total Returns - Lazard US Convertibles Portfolio
12 Months Ended 36 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Bloomberg US Universal Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] Bloomberg US Universal Index (reflects no deduction for fees, expenses or taxes)    
Bloomberg US Universal Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   7.58% 5.24%
ICE BofAML US Convertible Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] ICE BofAML US Convertible Index (reflects no deduction for fees, expenses or taxes)    
ICE BofAML US Convertible Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   17.98% 13.96%
Institutional | Average Annual Return, Percent   16.94% 10.83%
Institutional | Performance Inception Date     Dec. 30, 2022
Institutional | After Taxes on Distributions | Average Annual Return, Percent   14.62% 9.26%
Institutional | After Taxes on Distributions and Sales | Average Annual Return, Percent   10.94% 7.91%
Open | Average Annual Return, Percent   16.51% 10.54%
Open | Performance Inception Date     Dec. 30, 2022
R6 | Average Annual Return, Percent   16.94% 10.83%
R6 | Performance Inception Date     Dec. 30, 2022
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.

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]
  

Best Quarter:

 

2020, Q2

19.33%

 

 

Worst Quarter:

2020, Q1

-20.03%

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.

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]
Average Annual Total Returns - Lazard US Equity Focus Portfolio
12 Months Ended 60 Months Ended 120 Months Ended 139 Months Ended 252 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
S&P 500 Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] S&P 500 Index (reflects no deduction for fees, expenses or taxes)          
S&P 500 Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   17.88% 14.42% 14.82%    
Institutional | Average Annual Return, Percent   15.18% 10.74% 12.44%    
Institutional | Performance Inception Date           Dec. 30, 2004
Institutional | After Taxes on Distributions | Average Annual Return, Percent   11.60% 9.15% 10.37%    
Institutional | After Taxes on Distributions and Sales | Average Annual Return, Percent   11.17% 8.28% 9.64%    
Open | Average Annual Return, Percent   14.86% 10.44% 12.14%    
Open | Performance Inception Date           Dec. 30, 2004
R6 | Average Annual Return, Percent   15.17% 10.73% 12.45%    
R6 | Performance Inception Date         May 19, 2014  
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.

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]
  

Best Quarter:

 

2020, Q2

7.80%

 

 

Worst Quarter:

2020, Q1

-9.80%

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.

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]
Average Annual Total Returns - Lazard US High Yield Portfolio
12 Months Ended 60 Months Ended 110 Months Ended 120 Months Ended 334 Months Ended 336 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Bloomberg US Universal Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] Bloomberg US Universal Index (reflects no deduction for fees, expenses or taxes)            
Bloomberg US Universal Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   7.58% 0.06%   2.44%    
ICE BofA US High Yield Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] ICE BofA US High Yield Index (reflects no deduction for fees, expenses or taxes)            
ICE BofA US High Yield Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   8.50% 4.50%   6.45%    
Institutional | Average Annual Return, Percent   10.46% 3.54%   4.77%    
Institutional | Performance Inception Date             Jan. 02, 1998
Institutional | After Taxes on Distributions | Average Annual Return, Percent   7.98% 1.63%   2.81%    
Institutional | After Taxes on Distributions and Sales | Average Annual Return, Percent   6.13% 1.84%   2.79%    
Open | Average Annual Return, Percent   10.17% 3.27%   4.49%    
Open | Performance Inception Date           Feb. 24, 1998  
R6 | Average Annual Return, Percent   10.46% 3.56%        
R6 | Performance Inception Date       Nov. 03, 2016      
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.

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]
  

Best Quarter:

 

2024, Q3

3.11%

 

 

Worst Quarter:

2022, Q1

-1.62%

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.

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]
Average Annual Total Returns - Lazard US Short Duration Fixed Income Portfolio
12 Months Ended 60 Months Ended 120 Months Ended 178 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Bloomberg US Universal Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] Bloomberg US Universal Index (reflects no deduction for fees, expenses or taxes)        
Bloomberg US Universal Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   7.58% 0.06% 2.44%  
ICE BofA 1-3 Year U.S. Treasury Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] ICE BofA 1-3 Year U.S. Treasury Index (reflects no deduction for fees, expenses or taxes)        
ICE BofA 1-3 Year U.S. Treasury Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   5.09% 1.79% 1.85%  
Institutional | Average Annual Return, Percent   4.67% 1.97% 1.80%  
Institutional | Performance Inception Date         Feb. 28, 2011
Institutional | After Taxes on Distributions | Average Annual Return, Percent   3.14% 0.94% 0.96%  
Institutional | After Taxes on Distributions and Sales | Average Annual Return, Percent   2.75% 1.06% 1.01%  
Open | Average Annual Return, Percent   4.53% 1.77% 1.56%  
Open | Performance Inception Date         Feb. 28, 2011
R6 | Average Annual Return, Percent   4.67% 1.97% 1.80%  
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.

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]
  

Best Quarter:

 

2020, Q4

23.67%

 

 

Worst Quarter:

2020, Q1

-31.16%

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.

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]
Average Annual Total Returns - Lazard US Small Cap Equity Select Portfolio
12 Months Ended 60 Months Ended 72 Months Ended 120 Months Ended 347 Months Ended 410 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Russell 3000 Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] Russell 3000 Index (reflects no deduction for fees, expenses or taxes)            
Russell 3000 Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   17.15% 13.15%   14.29%    
Russell 2000 Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Label [Optional Text] Russell 2000 Index (reflects no deduction for fees, expenses or taxes)            
Russell 2000 Index(reflects no deduction for fees, expenses or taxes) | Average Annual Return, Percent   12.81% 6.09%   9.62%    
Institutional | Average Annual Return, Percent   2.46% 4.98%   7.34%    
Institutional | Performance Inception Date             Oct. 30, 1991
Institutional | After Taxes on Distributions | Average Annual Return, Percent   0.77% 2.64%   5.19%    
Institutional | After Taxes on Distributions and Sales | Average Annual Return, Percent   1.79% 3.60%   5.44%    
Open | Average Annual Return, Percent   2.26% 4.70%   7.04%    
Open | Performance Inception Date           Jan. 30, 1997  
R6 | Average Annual Return, Percent   2.50% 5.05%        
R6 | Performance Inception Date       Jan. 08, 2020      
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