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Incentive Plans - Schedule of Activity Relating to RSUs and DSUs (Parenthetical) (Detail) | 9 Months Ended
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Sep. 30, 2022 shares
RSUs [Member] |
Share-based compensation arrangement by share-based payment award [Line Items] |
Dividend participation rights | 336,740

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- Definition Issuance of restricted stock units in connection with dividend participation rights. + References No definition available. + Details
Name: | laz_IssuanceOfRestrictedStockUnitsInConnectionWithDividendParticipationRights
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
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |