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Senior Debt - Senior Debt (Parenthetical) (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Lazard Group 3.75% Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Senior notes interest rate | 3.75% |
Senior debt maturity date | Feb. 13, 2025 | Feb. 13, 2025
Effective interest rates of senior notes | 3.87% |
Lazard Group 3.625% Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Senior notes interest rate | 3.625% |
Senior debt maturity date | Mar. 01, 2027 | Mar. 01, 2027
Effective interest rates of senior notes | 3.76% |
Lazard Group 4.50% Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Senior notes interest rate | 4.50% |
Senior debt maturity date | Sep. 19, 2028 | Sep. 19, 2028
Effective interest rates of senior notes | 4.67% |
Lazard Group 4.375% Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Senior notes interest rate | 4.375% |
Senior debt maturity date | Mar. 11, 2029 | Mar. 11, 2029
Effective interest rates of senior notes | 4.53% |

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