XML 12 R1.htm IDEA: XBRL DOCUMENT v3.21.2
Document and Entity Information - shares
9 Months Ended
Sep. 30, 2021
Oct. 22, 2021
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2021  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q3  
Entity Registrant Name LAZARD LTD  
Entity Central Index Key 0001311370  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Shell Company false  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   112,766,091
Document Quarterly Report true  
Document Transition Report false  
Entity Incorporation, State or Country Code D0  
Entity File Number 001-32492  
Entity Tax Identification Number 98-0437848  
Entity Address, Address Line One Clarendon House  
Entity Address, Address Line Two 2 Church Street  
Entity Address, City or Town Hamilton  
Entity Address, State or Province HM11  
Entity Address, Country BM  
City Area Code 441  
Local Phone Number 295-1422  
Title of each class Class A Common Stock  
Trading Symbol LAZ  
Name of each exchange on which registered NYSE  
Subsidiaries of Lazard Ltd [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   9,892,150