| Document and Entity Information Document | Dec. 11, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Dec. 11, 2024 |
| Entity Registrant Name | Lazard Group LLC |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 333-126751 |
| Entity Tax Identification Number | 51-0278097 |
| Entity Address, Address Line One | 30 Rockefeller Plaza |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10112 |
| City Area Code | 212 |
| Local Phone Number | 632-6000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001326141 |
| Amendment Flag | false |
