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Investments - Company's Investments and Securities Sold, Not Yet Purchased (Parenthetical) (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Investments [Line Items] |  |
Investments | $ 787,139 | $ 1,007,339
Alternative Investment Funds [Member] |  |
Schedule of Investments [Line Items] |  |
Investments | 54,003 | 49,757
Alternative Investment Funds [Member] | Lazard Fund Interests [Member] |  |
Schedule of Investments [Line Items] |  |
Investments | 23,799 | 18,326
Debt Funds [Member] |  |
Schedule of Investments [Line Items] |  |
Investments | 181,322 | 164,952
Debt Funds [Member] | Lazard Fund Interests [Member] |  |
Schedule of Investments [Line Items] |  |
Investments | 150,882 | 132,875
Equity Funds [Member] |  |
Schedule of Investments [Line Items] |  |
Investments | 352,544 | 375,761
Equity Funds [Member] | Lazard Fund Interests [Member] |  |
Schedule of Investments [Line Items] |  |
Investments | $ 277,940 | $ 306,618

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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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