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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

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=laz_CustomerAndOtherReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: