3.20.1 html 53 103 1 false 54 0 false 0 false false R1.htm 000001 - Document - Document and Entity Information Sheet http://www.lazard.com/20200319/role/DocumentAndEntityInformation Document and Entity Information 1 false false R2.htm 020000 - Document - Risk/Return Summary {Unlabeled} - Lazard Retirement Developing Markets Equity Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardRetirementDevelopingMarketsEquityPortfolio Risk/Return Summary- Lazard Retirement Developing Markets Equity Portfolio 2 false false R3.htm 020001 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Retirement Developing Markets Equity Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardRetirementDevelopingMarketsEquityPortfolio Risk/Return Detail Data- Lazard Retirement Developing Markets Equity Portfolio 3 false false R4.htm 020002 - Document - Risk/Return Summary {Unlabeled} - Lazard Retirement Emerging Markets Equity Advantage Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardRetirementEmergingMarketsEquityAdvantagePortfolio Risk/Return Summary- Lazard Retirement Emerging Markets Equity Advantage Portfolio 4 false false R5.htm 020003 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Retirement Emerging Markets Equity Advantage Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardRetirementEmergingMarketsEquityAdvantagePortfolio Risk/Return Detail Data- Lazard Retirement Emerging Markets Equity Advantage Portfolio 5 false false R6.htm 020004 - Document - Risk/Return Summary {Unlabeled} - Lazard Retirement Emerging Markets Equity Blend Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardRetirementEmergingMarketsEquityBlendPortfolio Risk/Return Summary- Lazard Retirement Emerging Markets Equity Blend Portfolio 6 false false R7.htm 020005 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Retirement Emerging Markets Equity Blend Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardRetirementEmergingMarketsEquityBlendPortfolio Risk/Return Detail Data- Lazard Retirement Emerging Markets Equity Blend Portfolio 7 false false R8.htm 020006 - Document - Risk/Return Summary {Unlabeled} - Lazard Retirement Emerging Markets Equity Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardRetirementEmergingMarketsEquityPortfolio Risk/Return Summary- Lazard Retirement Emerging Markets Equity Portfolio 8 false false R9.htm 020007 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Retirement Emerging Markets Equity Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardRetirementEmergingMarketsEquityPortfolio Risk/Return Detail Data- Lazard Retirement Emerging Markets Equity Portfolio 9 false false R10.htm 020008 - Document - Risk/Return Summary {Unlabeled} - Lazard Retirement Enhanced Opportunities Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardRetirementEnhancedOpportunitiesPortfolio Risk/Return Summary- Lazard Retirement Enhanced Opportunities Portfolio 10 false false R11.htm 020009 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Retirement Enhanced Opportunities Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardRetirementEnhancedOpportunitiesPortfolio Risk/Return Detail Data- Lazard Retirement Enhanced Opportunities Portfolio 11 false false R12.htm 020010 - Document - Risk/Return Summary {Unlabeled} - Lazard Retirement Equity Franchise Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardRetirementEquityFranchisePortfolio Risk/Return Summary- Lazard Retirement Equity Franchise Portfolio 12 false false R13.htm 020011 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Retirement Equity Franchise Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardRetirementEquityFranchisePortfolio Risk/Return Detail Data- Lazard Retirement Equity Franchise Portfolio 13 false false R14.htm 020012 - Document - Risk/Return Summary {Unlabeled} - Lazard Retirement Global Dynamic Multi-Asset Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardRetirementGlobalDynamicMultiAssetPortfolio Risk/Return Summary- Lazard Retirement Global Dynamic Multi-Asset Portfolio 14 false false R15.htm 020013 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Retirement Global Dynamic Multi-Asset Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardRetirementGlobalDynamicMultiAssetPortfolio Risk/Return Detail Data- Lazard Retirement Global Dynamic Multi-Asset Portfolio 15 false false R16.htm 020014 - Document - Risk/Return Summary {Unlabeled} - Lazard Retirement Global Listed Infrastructure Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardRetirementGlobalListedInfrastructurePortfolio Risk/Return Summary- Lazard Retirement Global Listed Infrastructure Portfolio 16 false false R17.htm 020015 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Retirement Global Listed Infrastructure Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardRetirementGlobalListedInfrastructurePortfolio Risk/Return Detail Data- Lazard Retirement Global Listed Infrastructure Portfolio 17 false false R18.htm 020016 - Document - Risk/Return Summary {Unlabeled} - Lazard Retirement Global Strategic Equity Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardRetirementGlobalStrategicEquityPortfolio Risk/Return Summary- Lazard Retirement Global Strategic Equity Portfolio 18 false false R19.htm 020017 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Retirement Global Strategic Equity Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardRetirementGlobalStrategicEquityPortfolio Risk/Return Detail Data- Lazard Retirement Global Strategic Equity Portfolio 19 false false R20.htm 020018 - Document - Risk/Return Summary {Unlabeled} - Lazard Retirement International Equity Advantage Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardRetirementInternationalEquityAdvantagePortfolio Risk/Return Summary- Lazard Retirement International Equity Advantage Portfolio 20 false false R21.htm 020019 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Retirement International Equity Advantage Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardRetirementInternationalEquityAdvantagePortfolio Risk/Return Detail Data- Lazard Retirement International Equity Advantage Portfolio 21 false false R22.htm 020020 - Document - Risk/Return Summary {Unlabeled} - Lazard Retirement International Equity Concentrated Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardRetirementInternationalEquityConcentratedPortfolio Risk/Return Summary- Lazard Retirement International Equity Concentrated Portfolio 22 false false R23.htm 020021 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Retirement International Equity Concentrated Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardRetirementInternationalEquityConcentratedPortfolio Risk/Return Detail Data- Lazard Retirement International Equity Concentrated Portfolio 23 false false R24.htm 020022 - Document - Risk/Return Summary {Unlabeled} - Lazard Retirement International Equity Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardRetirementInternationalEquityPortfolio Risk/Return Summary- Lazard Retirement International Equity Portfolio 24 false false R25.htm 020023 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Retirement International Equity Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardRetirementInternationalEquityPortfolio Risk/Return Detail Data- Lazard Retirement International Equity Portfolio 25 false false R26.htm 020024 - Document - Risk/Return Summary {Unlabeled} - Lazard Retirement International Equity Select Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardRetirementInternationalEquitySelectPortfolio Risk/Return Summary- Lazard Retirement International Equity Select Portfolio 26 false false R27.htm 020025 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Retirement International Equity Select Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardRetirementInternationalEquitySelectPortfolio Risk/Return Detail Data- Lazard Retirement International Equity Select Portfolio 27 false false R28.htm 020026 - Document - Risk/Return Summary {Unlabeled} - Lazard Retirement US Small-Mid Cap Equity Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardRetirementUSSmallMidCapEquityPortfolio Risk/Return Summary- Lazard Retirement US Small-Mid Cap Equity Portfolio 28 false false R29.htm 020027 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Retirement US Small-Mid Cap Equity Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardRetirementUSSmallMidCapEquityPortfolio Risk/Return Detail Data- Lazard Retirement US Small-Mid Cap Equity Portfolio 29 false false R30.htm 020028 - Document - Risk/Return Summary {Unlabeled} - Lazard Retirement US Equity Concentrated Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardRetirementUSEquityConcentratedPortfolio Risk/Return Summary- Lazard Retirement US Equity Concentrated Portfolio 30 false false R31.htm 020029 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Retirement US Equity Concentrated Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardRetirementUSEquityConcentratedPortfolio Risk/Return Detail Data- Lazard Retirement US Equity Concentrated Portfolio 31 false false R32.htm 020030 - Document - Risk/Return Summary {Unlabeled} - Lazard Retirement Real Assets and Pricing Opportunities Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardRetirementRealAssetsandPricingOpportunitiesPortfolio Risk/Return Summary- Lazard Retirement Real Assets and Pricing Opportunities Portfolio 32 false false R33.htm 020031 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Retirement Real Assets and Pricing Opportunities Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardRetirementRealAssetsandPricingOpportunitiesPortfolio Risk/Return Detail Data- Lazard Retirement Real Assets and Pricing Opportunities Portfolio 33 false false R34.htm 020032 - Document - Risk/Return Summary {Unlabeled} - Lazard Retirement Opportunistic Strategies Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardRetirementOpportunisticStrategiesPortfolio Risk/Return Summary- Lazard Retirement Opportunistic Strategies Portfolio 34 false false R35.htm 020033 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Retirement Opportunistic Strategies Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardRetirementOpportunisticStrategiesPortfolio Risk/Return Detail Data- Lazard Retirement Opportunistic Strategies Portfolio 35 false false R36.htm 020034 - Document - Risk/Return Summary {Unlabeled} - Lazard Retirement Managed Equity Volatility Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardRetirementManagedEquityVolatilityPortfolio Risk/Return Summary- Lazard Retirement Managed Equity Volatility Portfolio 36 false false R37.htm 020035 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Retirement Managed Equity Volatility Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardRetirementManagedEquityVolatilityPortfolio Risk/Return Detail Data- Lazard Retirement Managed Equity Volatility Portfolio 37 false false R38.htm 020036 - Document - Risk/Return Summary {Unlabeled} - Lazard Retirement International Strategic Equity Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardRetirementInternationalStrategicEquityPortfolio Risk/Return Summary- Lazard Retirement International Strategic Equity Portfolio 38 false false R39.htm 020037 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Retirement International Strategic Equity Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardRetirementInternationalStrategicEquityPortfolio Risk/Return Detail Data- Lazard Retirement International Strategic Equity Portfolio 39 false false R40.htm 020038 - Document - Risk/Return Summary {Unlabeled} - Lazard Retirement International Small Cap Equity Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardRetirementInternationalSmallCapEquityPortfolio Risk/Return Summary- Lazard Retirement International Small Cap Equity Portfolio 40 false false R41.htm 020039 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Retirement International Small Cap Equity Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardRetirementInternationalSmallCapEquityPortfolio Risk/Return Detail Data- Lazard Retirement International Small Cap Equity Portfolio 41 false false R42.htm 020040 - Document - Risk/Return Summary {Unlabeled} - Lazard Retirement International Quality Growth Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardRetirementInternationalQualityGrowthPortfolio Risk/Return Summary- Lazard Retirement International Quality Growth Portfolio 42 false false R43.htm 020041 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Retirement International Quality Growth Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardRetirementInternationalQualityGrowthPortfolio Risk/Return Detail Data- Lazard Retirement International Quality Growth Portfolio 43 false false R44.htm 020042 - Document - Risk/Return Summary {Unlabeled} - Lazard Retirement International Equity Value Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardRetirementInternationalEquityValuePortfolio Risk/Return Summary- Lazard Retirement International Equity Value Portfolio 44 false false R45.htm 020043 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Retirement International Equity Value Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardRetirementInternationalEquityValuePortfolio Risk/Return Detail Data- Lazard Retirement International Equity Value Portfolio 45 false false R46.htm 020044 - Document - Risk/Return Summary {Unlabeled} - Lazard Developing Markets Equity Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardDevelopingMarketsEquityPortfolio Risk/Return Summary- Lazard Developing Markets Equity Portfolio 46 false false R47.htm 020045 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Developing Markets Equity Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardDevelopingMarketsEquityPortfolio Risk/Return Detail Data- Lazard Developing Markets Equity Portfolio 47 false false R48.htm 020046 - Document - Risk/Return Summary {Unlabeled} - Lazard US Small-Mid Cap Equity Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardUSSmallMidCapEquityPortfolio Risk/Return Summary- Lazard US Small-Mid Cap Equity Portfolio 48 false false R49.htm 020047 - Disclosure - Risk/Return Detail Data {Elements} - Lazard US Small-Mid Cap Equity Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardUSSmallMidCapEquityPortfolio Risk/Return Detail Data- Lazard US Small-Mid Cap Equity Portfolio 49 false false R50.htm 020048 - Document - Risk/Return Summary {Unlabeled} - Lazard US Short Duration Fixed Income Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardUSShortDurationFixedIncomePortfolio Risk/Return Summary- Lazard US Short Duration Fixed Income Portfolio 50 false false R51.htm 020049 - Disclosure - Risk/Return Detail Data {Elements} - Lazard US Short Duration Fixed Income Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardUSShortDurationFixedIncomePortfolio Risk/Return Detail Data- Lazard US Short Duration Fixed Income Portfolio 51 false false R52.htm 020050 - Document - Risk/Return Summary {Unlabeled} - Lazard US Realty Equity Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardUSRealtyEquityPortfolio Risk/Return Summary- Lazard US Realty Equity Portfolio 52 false false R53.htm 020051 - Disclosure - Risk/Return Detail Data {Elements} - Lazard US Realty Equity Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardUSRealtyEquityPortfolio Risk/Return Detail Data- Lazard US Realty Equity Portfolio 53 false false R54.htm 020052 - Document - Risk/Return Summary {Unlabeled} - Lazard US Equity Focus Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardUSEquityFocusPortfolio Risk/Return Summary- Lazard US Equity Focus Portfolio 54 false false R55.htm 020053 - Disclosure - Risk/Return Detail Data {Elements} - Lazard US Equity Focus Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardUSEquityFocusPortfolio Risk/Return Detail Data- Lazard US Equity Focus Portfolio 55 false false R56.htm 020054 - Document - Risk/Return Summary {Unlabeled} - Lazard US Equity Concentrated Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardUSEquityConcentratedPortfolio Risk/Return Summary- Lazard US Equity Concentrated Portfolio 56 false false R57.htm 020055 - Disclosure - Risk/Return Detail Data {Elements} - Lazard US Equity Concentrated Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardUSEquityConcentratedPortfolio Risk/Return Detail Data- Lazard US Equity Concentrated Portfolio 57 false false R58.htm 020056 - Document - Risk/Return Summary {Unlabeled} - Lazard US Corporate Income Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardUSCorporateIncomePortfolio Risk/Return Summary- Lazard US Corporate Income Portfolio 58 false false R59.htm 020057 - Disclosure - Risk/Return Detail Data {Elements} - Lazard US Corporate Income Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardUSCorporateIncomePortfolio Risk/Return Detail Data- Lazard US Corporate Income Portfolio 59 false false R60.htm 020058 - Document - Risk/Return Summary {Unlabeled} - Lazard Real Assets and Pricing Opportunities Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardRealAssetsandPricingOpportunitiesPortfolio Risk/Return Summary- Lazard Real Assets and Pricing Opportunities Portfolio 60 false false R61.htm 020059 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Real Assets and Pricing Opportunities Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardRealAssetsandPricingOpportunitiesPortfolio Risk/Return Detail Data- Lazard Real Assets and Pricing Opportunities Portfolio 61 false false R62.htm 020060 - Document - Risk/Return Summary {Unlabeled} - Lazard Opportunistic Strategies Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardOpportunisticStrategiesPortfolio Risk/Return Summary- Lazard Opportunistic Strategies Portfolio 62 false false R63.htm 020061 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Opportunistic Strategies Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardOpportunisticStrategiesPortfolio Risk/Return Detail Data- Lazard Opportunistic Strategies Portfolio 63 false false R64.htm 020062 - Document - Risk/Return Summary {Unlabeled} - Lazard Managed Equity Volatility Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardManagedEquityVolatilityPortfolio Risk/Return Summary- Lazard Managed Equity Volatility Portfolio 64 false false R65.htm 020063 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Managed Equity Volatility Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardManagedEquityVolatilityPortfolio Risk/Return Detail Data- Lazard Managed Equity Volatility Portfolio 65 false false R66.htm 020064 - Document - Risk/Return Summary {Unlabeled} - Lazard International Strategic Equity Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardInternationalStrategicEquityPortfolio Risk/Return Summary- Lazard International Strategic Equity Portfolio 66 false false R67.htm 020065 - Disclosure - Risk/Return Detail Data {Elements} - Lazard International Strategic Equity Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardInternationalStrategicEquityPortfolio Risk/Return Detail Data- Lazard International Strategic Equity Portfolio 67 false false R68.htm 020066 - Document - Risk/Return Summary {Unlabeled} - Lazard International Small Cap Equity Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardInternationalSmallCapEquityPortfolio Risk/Return Summary- Lazard International Small Cap Equity Portfolio 68 false false R69.htm 020067 - Disclosure - Risk/Return Detail Data {Elements} - Lazard International Small Cap Equity Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardInternationalSmallCapEquityPortfolio Risk/Return Detail Data- Lazard International Small Cap Equity Portfolio 69 false false R70.htm 020068 - Document - Risk/Return Summary {Unlabeled} - Lazard International Quality Growth Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardInternationalQualityGrowthPortfolio Risk/Return Summary- Lazard International Quality Growth Portfolio 70 false false R71.htm 020069 - Disclosure - Risk/Return Detail Data {Elements} - Lazard International Quality Growth Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardInternationalQualityGrowthPortfolio Risk/Return Detail Data- Lazard International Quality Growth Portfolio 71 false false R72.htm 020070 - Document - Risk/Return Summary {Unlabeled} - Lazard International Equity Value Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardInternationalEquityValuePortfolio Risk/Return Summary- Lazard International Equity Value Portfolio 72 false false R73.htm 020071 - Disclosure - Risk/Return Detail Data {Elements} - Lazard International Equity Value Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardInternationalEquityValuePortfolio Risk/Return Detail Data- Lazard International Equity Value Portfolio 73 false false R74.htm 020072 - Document - Risk/Return Summary {Unlabeled} - Lazard International Equity Select Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardInternationalEquitySelectPortfolio Risk/Return Summary- Lazard International Equity Select Portfolio 74 false false R75.htm 020073 - Disclosure - Risk/Return Detail Data {Elements} - Lazard International Equity Select Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardInternationalEquitySelectPortfolio Risk/Return Detail Data- Lazard International Equity Select Portfolio 75 false false R76.htm 020074 - Document - Risk/Return Summary {Unlabeled} - Lazard International Equity Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardInternationalEquityPortfolio Risk/Return Summary- Lazard International Equity Portfolio 76 false false R77.htm 020075 - Disclosure - Risk/Return Detail Data {Elements} - Lazard International Equity Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardInternationalEquityPortfolio Risk/Return Detail Data- Lazard International Equity Portfolio 77 false false R78.htm 020076 - Document - Risk/Return Summary {Unlabeled} - Lazard International Equity Concentrated Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardInternationalEquityConcentratedPortfolio Risk/Return Summary- Lazard International Equity Concentrated Portfolio 78 false false R79.htm 020077 - Disclosure - Risk/Return Detail Data {Elements} - Lazard International Equity Concentrated Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardInternationalEquityConcentratedPortfolio Risk/Return Detail Data- Lazard International Equity Concentrated Portfolio 79 false false R80.htm 020078 - Document - Risk/Return Summary {Unlabeled} - Lazard International Equity Advantage Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardInternationalEquityAdvantagePortfolio Risk/Return Summary- Lazard International Equity Advantage Portfolio 80 false false R81.htm 020079 - Disclosure - Risk/Return Detail Data {Elements} - Lazard International Equity Advantage Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardInternationalEquityAdvantagePortfolio Risk/Return Detail Data- Lazard International Equity Advantage Portfolio 81 false false R82.htm 020080 - Document - Risk/Return Summary {Unlabeled} - Lazard Global Strategic Equity Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardGlobalStrategicEquityPortfolio Risk/Return Summary- Lazard Global Strategic Equity Portfolio 82 false false R83.htm 020081 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Global Strategic Equity Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardGlobalStrategicEquityPortfolio Risk/Return Detail Data- Lazard Global Strategic Equity Portfolio 83 false false R84.htm 020082 - Document - Risk/Return Summary {Unlabeled} - Lazard Global Listed Infrastructure Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardGlobalListedInfrastructurePortfolio Risk/Return Summary- Lazard Global Listed Infrastructure Portfolio 84 false false R85.htm 020083 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Global Listed Infrastructure Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardGlobalListedInfrastructurePortfolio Risk/Return Detail Data- Lazard Global Listed Infrastructure Portfolio 85 false false R86.htm 020084 - Document - Risk/Return Summary {Unlabeled} - Lazard Global Fixed Income Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardGlobalFixedIncomePortfolio Risk/Return Summary- Lazard Global Fixed Income Portfolio 86 false false R87.htm 020085 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Global Fixed Income Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardGlobalFixedIncomePortfolio Risk/Return Detail Data- Lazard Global Fixed Income Portfolio 87 false false R88.htm 020086 - Document - Risk/Return Summary {Unlabeled} - Lazard Global Equity Select Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardGlobalEquitySelectPortfolio Risk/Return Summary- Lazard Global Equity Select Portfolio 88 false false R89.htm 020087 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Global Equity Select Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardGlobalEquitySelectPortfolio Risk/Return Detail Data- Lazard Global Equity Select Portfolio 89 false false R90.htm 020088 - Document - Risk/Return Summary {Unlabeled} - Lazard Global Dynamic Multi-Asset Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardGlobalDynamicMultiAssetPortfolio Risk/Return Summary- Lazard Global Dynamic Multi-Asset Portfolio 90 false false R91.htm 020089 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Global Dynamic Multi-Asset Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardGlobalDynamicMultiAssetPortfolio Risk/Return Detail Data- Lazard Global Dynamic Multi-Asset Portfolio 91 false false R92.htm 020090 - Document - Risk/Return Summary {Unlabeled} - Lazard Equity Franchise Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardEquityFranchisePortfolio Risk/Return Summary- Lazard Equity Franchise Portfolio 92 false false R93.htm 020091 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Equity Franchise Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardEquityFranchisePortfolio Risk/Return Detail Data- Lazard Equity Franchise Portfolio 93 false false R94.htm 020092 - Document - Risk/Return Summary {Unlabeled} - Lazard Enhanced Opportunities Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardEnhancedOpportunitiesPortfolio Risk/Return Summary- Lazard Enhanced Opportunities Portfolio 94 false false R95.htm 020093 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Enhanced Opportunities Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardEnhancedOpportunitiesPortfolio Risk/Return Detail Data- Lazard Enhanced Opportunities Portfolio 95 false false R96.htm 020094 - Document - Risk/Return Summary {Unlabeled} - Lazard Emerging Markets Core Equity Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardEmergingMarketsCoreEquityPortfolio Risk/Return Summary- Lazard Emerging Markets Core Equity Portfolio 96 false false R97.htm 020095 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Emerging Markets Core Equity Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardEmergingMarketsCoreEquityPortfolio Risk/Return Detail Data- Lazard Emerging Markets Core Equity Portfolio 97 false false R98.htm 020096 - Document - Risk/Return Summary {Unlabeled} - Lazard Emerging Markets Equity Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardEmergingMarketsEquityPortfolio Risk/Return Summary- Lazard Emerging Markets Equity Portfolio 98 false false R99.htm 020097 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Emerging Markets Equity Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardEmergingMarketsEquityPortfolio Risk/Return Detail Data- Lazard Emerging Markets Equity Portfolio 99 false false R100.htm 020098 - Document - Risk/Return Summary {Unlabeled} - Lazard Emerging Markets Equity Blend Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardEmergingMarketsEquityBlendPortfolio Risk/Return Summary- Lazard Emerging Markets Equity Blend Portfolio 100 false false R101.htm 020099 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Emerging Markets Equity Blend Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardEmergingMarketsEquityBlendPortfolio Risk/Return Detail Data- Lazard Emerging Markets Equity Blend Portfolio 101 false false R102.htm 020100 - Document - Risk/Return Summary {Unlabeled} - Lazard Emerging Markets Equity Advantage Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardEmergingMarketsEquityAdvantagePortfolio Risk/Return Summary- Lazard Emerging Markets Equity Advantage Portfolio 102 false false R103.htm 020101 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Emerging Markets Equity Advantage Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardEmergingMarketsEquityAdvantagePortfolio Risk/Return Detail Data- Lazard Emerging Markets Equity Advantage Portfolio 103 false false R104.htm 020102 - Document - Risk/Return Summary {Unlabeled} - Lazard Emerging Markets Debt Portfolio Sheet http://www.lazard.com/20200319/role/DocumentRiskReturnSummaryUnlabeledLazardEmergingMarketsDebtPortfolio Risk/Return Summary- Lazard Emerging Markets Debt Portfolio 104 false false R105.htm 020103 - Disclosure - Risk/Return Detail Data {Elements} - Lazard Emerging Markets Debt Portfolio Sheet http://www.lazard.com/20200319/role/DisclosureRiskReturnDetailDataElementsLazardEmergingMarketsDebtPortfolio Risk/Return Detail Data- Lazard Emerging Markets Debt Portfolio 105 false false R106.htm 040000 - Disclosure - Risk/Return Detail Data {Elements} Sheet http://xbrl.sec.gov/rr/role/RiskReturnDetailData Risk/Return Detail Data 106 false false All Reports Book All Reports cik0000874964-20200319.xml cik0000874964-20200319.xsd cik0000874964-20200319_def.xml cik0000874964-20200319_lab.xml cik0000874964-20200319_pre.xml http://xbrl.sec.gov/rr/2018-01-31 http://xbrl.sec.gov/dei/2019-01-31 true false