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RECEIVABLES AND ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivables | $ 115,379 | $ 97,964
Carrying amount | 427,001 | 425,904
Customer and Other Receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Customer loans | $ 89,753 | $ 128,890

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- Definition Customer loans are related to collateralized lending activities, loans granted by bank to third parties. and clearing organization relating to unsettled securities transactions + References No definition available. + Details
Name: | laz_CustomerLoans
Namespace Prefix: | laz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Financing fee receivables represent those receivables that are paid on an installment basis and may or may not include an interest component + References No definition available. + Details
Name: | laz_FinancingFeeReceivable
Namespace Prefix: | laz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Other Fees And Customers And Other Receivables Not Discussed Elsewhere In The Note + References No definition available. + Details
Name: | laz_OtherFeesAndCustomersAndOtherReceivablesNotDiscussedElsewhereInTheNote
Namespace Prefix: | laz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FinancialInstrumentAxis=laz_CustomerAndOtherReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |