XML 74 R57.htm IDEA: XBRL DOCUMENT
v3.23.1

Fair Value Measurements - Additional Information (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Fair Value Option Quantitative Disclosures [Line Items] |  |  |
Transfers into or out of Level 3 in the fair value measurement hierarchy | $ 0 | $ 0 |
Unfunded Commitments | 5,455,000 |  | $ 5,455,000
EGCP III [Member] |  |  |
Fair Value Option Quantitative Disclosures [Line Items] |  |  |
Unfunded Commitments | $ 5,093,000 |  |
End of the investment period | Oct. 12, 2016 |  |
Remaining obligation date | Oct. 12, 2023 |  |

X
- Definition End of investment funding period for new investments. + References No definition available. + Details
Name: | laz_EndOfInvestmentFundingPeriod
Namespace Prefix: | laz_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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
- Definition Remaining obligation date to make capital contributions to fund follow up investments or to pay fund expenses. + References No definition available. + Details
Name: | laz_RemainingCommitmentDate
Namespace Prefix: | laz_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126976982&loc=SL6742756-110258 + Details
Name: | us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FairValueOptionQuantitativeDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=laz_EdgewaterGrowthCapitalPartnersThreeLpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |