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HEDGES AND OTHER DERIVATIVE INSTRUMENTS - Additional Information (Detail)
1 Months Ended 6 Months Ended
Feb. 28, 2014
USD ($)
Aug. 31, 2013
USD ($)
Jun. 30, 2015
USD ($)
instrument
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
instrument
Mar. 31, 2014
USD ($)
Derivatives And Hedging Activities [Line Items]            
Total investments, at fair value $ 312,900,000   $ 48,645,874,000   $ 46,533,799,000  
Interest receivable 1,000,000          
Cash payments 258,200,000   40,398,000 $ 22,498,000    
Oaktree CLO 2014-1 Ltd.            
Derivatives And Hedging Activities [Line Items]            
Portion funded by the Company 60,200,000          
Term Loan, Variable Rate            
Derivatives And Hedging Activities [Line Items]            
Face Amount     250,000,000      
Senior Loans            
Derivatives And Hedging Activities [Line Items]            
Proceeds from debt obligations issued by CLOs 450,000,000          
Proceeds from issuance of senior loans 456,000,000          
Debt issuance cost 6,000,000          
Senior Unsecured Credit Facility | Term Loan, Variable Rate            
Derivatives And Hedging Activities [Line Items]            
Face Amount     $ 250,000,000.0     $ 250,000,000
Interest Rate Swap | Cash Flow Hedging | Designated as Hedging Instrument            
Derivatives And Hedging Activities [Line Items]            
Number of interest-rate swaps (in agreements) | instrument     2   2  
Notional value of interest-rate swaps     $ 165,000,000   $ 180,000,000  
Contract amount     $ 333,800,000   $ 348,800,000  
Fair Value Hedging | Not Designated as Hedging Instrument | Total-return swaps            
Derivatives And Hedging Activities [Line Items]            
Contract amount   $ 200,000,000        
Average remaining maturity (in years)   2 years        
Collateral, right to reclaim cash 50,000,000.0 $ 50,000,000        
Realized gains 7,100,000          
Cash received on closing position 1,400,000          
Due from counter party 5,700,000          
Fair Value Hedging | Not Designated as Hedging Instrument | Total-return swaps | Oaktree CLO 2014-1 Ltd.            
Derivatives And Hedging Activities [Line Items]            
Collateral, right to reclaim cash $ 4,500,000