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RECEIVABLES AND ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables	$ 98,834	$ 113,929
Carrying amount	569,738	561,978
Customer and Other Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer loans	$ 81,911	$ 86,412

X

- 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

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

X

- Definition

Financing fee receivables represent those receivables that are paid on an installment basis and may or may not include an interest component

+ 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

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: