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INCENTIVE PLANS - Schedule of Impact of LFI and Other Similar Deferred Compensation Arrangements (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Share-Based Payment Arrangement [Abstract] |  |
Amortization and the impact of forfeitures | $ 18,481 | $ 35,699
Change in the fair value of underlying investments | 5,243 | 9,373
Total | $ 23,724 | $ 45,072

X
- Definition Amortization of awarded grants, net of forfeitures. + References No definition available. + Details
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Namespace Prefix: | laz_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

X
- Definition Compensation expense related to the change in fair value of the underlying investments. + References No definition available. + Details
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Namespace Prefix: | laz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expense recognized from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments), awarded to key employees or individuals. Excludes amount related to plans that cover generally all employees (for example, but not limited to, qualified pension plans). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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