XML 60 R50.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Investments - Company's Investments and Securities Sold, Not Yet Purchased (Parenthetical) (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Investments [Line Items] |  |
Investments | $ 638,960 | $ 1,007,339
Alternative Investment Funds [Member] |  |
Schedule of Investments [Line Items] |  |
Investments | 54,201 | 49,757
Alternative Investment Funds [Member] | Lazard Fund Interests [Member] |  |
Schedule of Investments [Line Items] |  |
Investments | 23,525 | 18,326
Debt Funds [Member] |  |
Schedule of Investments [Line Items] |  |
Investments | 167,763 | 164,952
Debt Funds [Member] | Lazard Fund Interests [Member] |  |
Schedule of Investments [Line Items] |  |
Investments | 137,949 | 132,875
Equity Funds [Member] |  |
Schedule of Investments [Line Items] |  |
Investments | 319,707 | 375,761
Equity Funds [Member] | Lazard Fund Interests [Member] |  |
Schedule of Investments [Line Items] |  |
Investments | $ 248,488 | $ 306,618

X
- Definition Sum of the carrying amounts as of the balance sheet date of all investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(h)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
Name: | us-gaap_Investments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_ScheduleOfInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | dei_LegalEntityAxis=laz_LazardFundInterestMember
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: |