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Investments - Company's Investments and Securities Sold, Not Yet Purchased (Parenthetical) (Detail) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Investments [Line Items] |  |
Investments | $ 741,868 | $ 698,977
Alternative Investment Funds [Member] |  |
Schedule of Investments [Line Items] |  |
Investments | 70,233 | 56,947
Alternative Investment Funds [Member] | Lazard Fund Interests [Member] | Lazard Group LLC [Member] |  |
Schedule of Investments [Line Items] |  |
Investments | 27,038 | 24,137
Debt Funds [Member] |  |
Schedule of Investments [Line Items] |  |
Investments | 205,701 | 178,556
Debt Funds [Member] | Lazard Fund Interests [Member] | Lazard Group LLC [Member] |  |
Schedule of Investments [Line Items] |  |
Investments | 176,210 | 142,632
Equity Funds [Member] |  |
Schedule of Investments [Line Items] |  |
Investments | 358,202 | 350,282
Equity Funds [Member] | Lazard Fund Interests [Member] | Lazard Group LLC [Member] |  |
Schedule of Investments [Line Items] |  |
Investments | $ 294,278 | $ 266,528

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- 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
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- 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
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