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Incentive Plans - Summary of Activity Related to RSAs (Parenthetical) (Detail)	3 Months Ended
	Mar. 31, 2023 shares
Restricted Stock [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Dividend participation rights	25,258

X

- Definition

Dividend participation rights issued relating to restricted stock.

+ References

No definition available.

+ Details

Name:	laz_IssuanceOfDividendParticipationRights
Namespace Prefix:	laz_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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

X

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: