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Receivables and Allowance for Credit Losses - Additional Information (Detail) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivables | $ 96,611 | $ 97,964
Customers and other | 188,296 | 160,897
Aggregate carrying amount of other fees and customers and other receivables | 472,850 | 425,904
Customer and Other Receivables [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Customers and other | $ 128,666 | $ 128,890

X
- Definition Amount of financing receivables included in total fee receivables. + References No definition available. + Details
Name: | laz_FinancingFeeReceivable
Namespace Prefix: | laz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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

X
- Definition Receivables from customers related to collateralized lending activities, loans granted by bank to third party clients, managing directors, employees in the ordinary course of business, receivables from brokers-dealers and clearing organizations relating to unsettled securities transactions and receivables from related parties. + References No definition available. + Details
Name: | laz_ReceivablesFromCustomersAndOther
Namespace Prefix: | laz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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: |