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Investments - Additional Information (Detail) - Debt [Member] - U.S. Treasury Securities [Member]	9 Months Ended
	Sep. 30, 2022
Minimum [Member]
Schedule of Investments [Line Items]
US Treasury securities maturity period	3 months
Maximum [Member]
Schedule of Investments [Line Items]
US Treasury securities maturity period	1 year

X

- Definition

Period of time between issuance and maturity of treasury securities, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	laz_
Data Type:	xbrli:durationItemType
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

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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X

- Details

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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Period Type: