XML 72 R59.htm IDEA: XBRL DOCUMENT
v3.23.3

FAIR VALUE MEASUREMENTS - Fair Value of Certain Investments Based on NAV (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
NAV | $ 88,962 | $ 64,968
Unfunded Commitments | 5,547 | 5,455
Hedge funds |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
NAV | $ 44,022 | $ 29,259
Hedge funds | Minimum |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Redemption Notice Period | 30 days | 30 days
Hedge funds | Maximum |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Redemption Notice Period | 60 days | 60 days
Hedge funds | Monthly |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Investments redeemable (as percent) | 73.00% | 68.00%
Hedge funds | Quarterly |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Investments redeemable (as percent) | 27.00% | 32.00%
Other |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
NAV | $ 654 | $ 615
Other | Minimum |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Redemption Notice Period | 30 days | 30 days
Other | Maximum |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Redemption Notice Period | 30 days | 30 days
Other | Monthly |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Investments redeemable (as percent) | 95.00% | 95.00%
Other | Daily |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Investments redeemable (as percent) | 5.00% | 5.00%
Debt |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
NAV | $ 4 | $ 4
Redemption Notice Period | 30 days | 30 days
Debt | Daily |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Investments redeemable (as percent) | 100.00% | 100.00%
Equity |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
NAV | $ 42 | $ 40
Equity | Minimum |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Redemption Notice Period | 30 days | 30 days
Equity | Maximum |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Redemption Notice Period | 60 days | 60 days
Equity | Monthly |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Investments redeemable (as percent) | 33.00% | 35.00%
Equity | Annually |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Investments redeemable (as percent) | 67.00% | 65.00%
Private equity | Equity growth |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
NAV | $ 44,240 | $ 35,050
Unfunded Commitments | $ 5,547 | $ 5,455
Fair value not redeemable (as percent) | 100.00% | 100.00%
Private equity | Consolidated But Not Owned |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Unfunded Commitments | $ 10,206 | $ 8,003

X
- Definition States the percentage with which the entity can redeem its investment, or portion thereof, per period (for example, annually, semi-annually, quarterly) for each of 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), by major category. + References No definition available. + Details
Name: | laz_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareInvestmentRedemptionFrequencyPercentage
Namespace Prefix: | laz_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of fair value not redeemable. + References No definition available. + Details
Name: | laz_PercentageOfFairValueNotRedeemable
Namespace Prefix: | laz_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 35 -Paragraph 54B -Publisher FASB -URI https://asc.fasb.org//1943274/2147482134/820-10-35-54B Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-6A + Details
Name: | us-gaap_AlternativeInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Notice period the entity is required to deliver before it can redeem an investment calculated using net asset value per share, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, investments calculated by per unit, per membership interest, other equity or ownership interest and alternative investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-6A + Details
Name: | us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareInvestmentRedemptionNoticePeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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 -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-6A + Details
Name: | us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_HedgeFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | laz_InvestmentRedemptionFrequencyAxis=laz_MonthlyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | laz_InvestmentRedemptionFrequencyAxis=laz_QuarterlyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=laz_OtherAlternativeInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | laz_InvestmentRedemptionFrequencyAxis=laz_DailyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_FixedIncomeFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_EquityFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | laz_InvestmentRedemptionFrequencyAxis=laz_AnnuallyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_PrivateEquityFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=laz_EquityGrowthMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=laz_ConsolidatedButNotOwnedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |