Quarterly report pursuant to Section 13 or 15(d)

Borrowings - SVP Financing Facilities (Details)

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Borrowings - SVP Financing Facilities (Details)
$ in Thousands
Jan. 11, 2030
Mar. 31, 2023
USD ($)
Jan. 12, 2023
USD ($)
Dec. 23, 2022
USD ($)
Sep. 16, 2022
USD ($)
Mar. 31, 2024
USD ($)
financingFacility
Dec. 31, 2023
USD ($)
financingFacility
Aug. 01, 2023
USD ($)
Jun. 22, 2023
USD ($)
Feb. 03, 2023
USD ($)
Jul. 19, 2022
USD ($)
Debt Instrument [Line Items]                      
Asset coverage ratio (as a percent)           261.90% 223.20%        
Number of special purpose vehicle financing facilities | financingFacility           5 4        
HLEND A Funding Facility | Line of credit                      
Debt Instrument [Line Items]                      
Line of credit maximum borrowing capacity       $ 800,000   $ 800,000 $ 800,000     $ 600,000  
Coupon       2.40%              
HLEND B Funding Facility | Line of credit                      
Debt Instrument [Line Items]                      
Line of credit maximum borrowing capacity         $ 1,250,000 1,250,000 1,000,000       $ 1,000,000
Basis spread floor         2.35%            
HLEND B Funding Facility | Line of credit | Broadly syndicated loans assets                      
Debt Instrument [Line Items]                      
Coupon         2.00%            
HLEND B Funding Facility | Line of credit | Large corporate loan assets                      
Debt Instrument [Line Items]                      
Coupon         2.40%            
HLEND B Funding Facility | Line of credit | Non-broadly syndicated loans assets                      
Debt Instrument [Line Items]                      
Coupon         2.65%            
HLEND C Funding Facility | Line of credit                      
Debt Instrument [Line Items]                      
Line of credit maximum borrowing capacity     $ 400,000     750,000 750,000   $ 750,000    
HLEND C Funding Facility | Line of credit | SOFR                      
Debt Instrument [Line Items]                      
Coupon     2.95%                
HLEND C Funding Facility | Line of credit | SOFR | Forecast                      
Debt Instrument [Line Items]                      
Basis spread increase (decrease) 2.00%                    
HLEND D Funding Facility | Line of credit                      
Debt Instrument [Line Items]                      
Line of credit maximum borrowing capacity   $ 250,000       500,000 $ 500,000 $ 500,000      
Coupon   2.90%                  
Foreign currency advance margin   0.15%                  
HLEND E Funding Facility | Line of credit                      
Debt Instrument [Line Items]                      
Line of credit maximum borrowing capacity           $ 300,000          
Coupon   2.25%