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Fair Value Measurements - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Transfers into or out of Level 3 in the fair value measurement hierarchy	$ 0	$ 0	$ 0

X

- Definition

The amount of fair value transfers into or out of level 3.

+ References

No definition available.

+ Details

Name:	laz_FairValueTransfersIntoOrOutOfLevel3
Namespace Prefix:	laz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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