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RELATED PARTY TRANSACTIONS - Additional Information (Detail)
12 Months Ended
Oct. 01, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Affiliated Entity        
Related Party Transaction [Line Items]        
Reimbursable expenses payable $ 750,000      
Termination period (in days) 90 days      
Administrative expenses   $ 200,000    
Rent expense   4,500,000    
Rent expense     $ 4,700,000 $ 4,700,000
Oaktree Capital Group Excluding Consolidated Funds        
Related Party Transaction [Line Items]        
Interest income   73,000 211,000 451,000
Oaktree Capital Group Excluding Consolidated Funds | Level III        
Related Party Transaction [Line Items]        
Due to affiliates   85,151,000 95,953,000  
Oaktree Capital Group Excluding Consolidated Funds | Affiliated Entity        
Related Party Transaction [Line Items]        
Management fees and incentive income   $ 800,000,000 $ 1,300,000,000 $ 1,400,000,000
Discount rate | Oaktree Capital Group Excluding Consolidated Funds | Discounted cash flow | Affiliated Entity | Level III        
Related Party Transaction [Line Items]        
Measurement input   0.100