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INCENTIVE PLANS - Schedule of Impact of LFI and Other Similar Deferred Compensation Arrangements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]
Amortization and the impact of forfeitures	$ 41,368	$ 41,956	$ 133,454	$ 125,210
Change in the fair value of underlying investments	(10,598)	(16,180)	15,530	(65,601)
Total	$ 30,770	$ 25,776	$ 148,984	$ 59,609

X

- Definition

Amortization of awarded grants, net of forfeitures.

+ References

No definition available.

+ Details

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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_
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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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