v3.10.0.1
Document and Entity Information - USD ($)
$ in Billions
12 Months Ended
Dec. 31, 2018
Feb. 20, 2019
Jun. 30, 2018
Entity Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Trading Symbol OAK    
Entity Registrant Name Oaktree Capital Group, LLC    
Entity Central Index Key 0001403528    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Small Business false    
Entity Shell Company false    
Entity Emerging Growth Company false    
Entity Public Float     $ 2.9
Class A Units      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   71,482,276  
Class B Units      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   85,408,069