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Receivables and Allowance for Credit Losses - Additional Information (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivables | $ 130,682 | $ 113,929
Carrying amount | 539,956 | 561,978
Customer and Other Receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Customer loans | $ 82,985 | $ 86,412

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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
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Namespace Prefix: | laz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of financing receivables included in total fee receivables. + References No definition available. + Details
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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
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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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 20 -Name Accounting Standards Codification -Section 40 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481628/310-20-40-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
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Period Type: | duration

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- Details
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