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Fair Value Measurements - Financial Instruments Not Measured at Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Financial Assets:        
Cash and cash equivalents $ 1,066,580us-gaap_CashAndCashEquivalentsAtCarryingValue $ 841,482us-gaap_CashAndCashEquivalentsAtCarryingValue $ 850,190us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,003,791us-gaap_CashAndCashEquivalentsAtCarryingValue
Deposits with banks and short-term investments 207,760laz_DepositsWithBanksAndShortTermInvestments 244,879laz_DepositsWithBanksAndShortTermInvestments    
Cash deposited with clearing organizations and other segregated cash 43,290us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations 62,046us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations    
Interest-bearing financing receivables 86,221laz_InterestBearingFinancingFeeReceivables 69,464laz_InterestBearingFinancingFeeReceivables    
Interest-bearing deposits (included within investments) 84,575us-gaap_CertificatesOfDepositAtCarryingValue 516us-gaap_CertificatesOfDepositAtCarryingValue    
Financial Liabilities:        
Deposits and other customer payables 314,284laz_DepositsAndOtherCustomerPayables 275,434laz_DepositsAndOtherCustomerPayables    
Senior debt 1,048,350us-gaap_SeniorNotes 1,048,350us-gaap_SeniorNotes    
Carrying Value [Member]        
Financial Assets:        
Cash and cash equivalents 1,066,580us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
841,482us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Deposits with banks and short-term investments 207,760laz_DepositsWithBanksAndShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
244,879laz_DepositsWithBanksAndShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Cash deposited with clearing organizations and other segregated cash 43,290us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
62,046us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Interest-bearing financing receivables 86,221laz_InterestBearingFinancingFeeReceivables
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
69,464laz_InterestBearingFinancingFeeReceivables
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Interest-bearing deposits (included within investments) 84,575us-gaap_CertificatesOfDepositAtCarryingValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
516us-gaap_CertificatesOfDepositAtCarryingValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Financial Liabilities:        
Deposits and other customer payables 314,284laz_DepositsAndOtherCustomerPayables
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
275,434laz_DepositsAndOtherCustomerPayables
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Senior debt 1,048,350us-gaap_SeniorNotes
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
1,048,350us-gaap_SeniorNotes
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Fair Value [Member]        
Financial Assets:        
Cash and cash equivalents 1,066,580us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
841,482us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Deposits with banks and short-term investments 207,760laz_DepositsWithBanksAndShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
244,879laz_DepositsWithBanksAndShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Cash deposited with clearing organizations and other segregated cash 43,290us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
62,046us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Interest-bearing financing receivables 88,499laz_InterestBearingFinancingFeeReceivables
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
71,433laz_InterestBearingFinancingFeeReceivables
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Interest-bearing deposits (included within investments) 84,575us-gaap_CertificatesOfDepositAtCarryingValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
516us-gaap_CertificatesOfDepositAtCarryingValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Financial Liabilities:        
Deposits and other customer payables 314,284laz_DepositsAndOtherCustomerPayables
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
275,434laz_DepositsAndOtherCustomerPayables
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Senior debt 1,134,834us-gaap_SeniorNotes
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
1,117,247us-gaap_SeniorNotes
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Fair Value [Member] | Level 1 [Member]        
Financial Assets:        
Cash and cash equivalents 1,066,580us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
841,482us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Deposits with banks and short-term investments 207,760laz_DepositsWithBanksAndShortTermInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
244,879laz_DepositsWithBanksAndShortTermInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Cash deposited with clearing organizations and other segregated cash 43,290us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
62,046us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Interest-bearing deposits (included within investments) 84,575us-gaap_CertificatesOfDepositAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
516us-gaap_CertificatesOfDepositAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Financial Liabilities:        
Deposits and other customer payables 314,284laz_DepositsAndOtherCustomerPayables
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
275,434laz_DepositsAndOtherCustomerPayables
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Fair Value [Member] | Level 2 [Member]        
Financial Liabilities:        
Senior debt 1,134,834us-gaap_SeniorNotes
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
1,117,247us-gaap_SeniorNotes
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Fair Value [Member] | Level 3 [Member]        
Financial Assets:        
Interest-bearing financing receivables $ 88,499laz_InterestBearingFinancingFeeReceivables
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
$ 71,433laz_InterestBearingFinancingFeeReceivables
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember