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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY AND REDEEMABLE NONCONTROLLING INTERESTS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Stockholders' Equity [Abstract]
Class A common stock dividends (in USD per share)	$ 0.50	$ 0.50	$ 1.50	$ 1.44
Related tax benefit of share-based incentive compensation on delivery of Class A common stock	$ (164)	$ 346	$ (254)	$ 6,604

X

- Definition

Tax expense (benefit) from stock issued in connection with share-based incentive compensation.

+ References

No definition available.

+ Details

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Namespace Prefix:	laz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1

+ Details

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Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Balance Type:	na
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