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Condensed Consolidated Statement of Changes in Stockholders' Equity and Redeemable Noncontrolling Interest (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement Of Stockholders Equity [Abstract]
Class A common stock dividends	$ 0.50	$ 0.47
Tax expense (benefit) related to delivery of Class A Common Stock in connection with share-based incentive compensation	$ 392	$ (6,137)

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
Period Type:	duration

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration