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Incentive Plans - Summary of Activity Related to RSAs (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2022 shares
Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Dividend participation rights | 67,261

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- Definition Dividend participation rights issued relating to restricted stock. + References No definition available. + Details
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Namespace Prefix: | laz_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |