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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