Quarterly report pursuant to Section 13 or 15(d)

SHARE-BASED COMPENSATION - Narrative (Details)

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SHARE-BASED COMPENSATION - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Share‑based compensation $ 4,883 $ 4,087 $ 8,986 $ 8,187
Restricted Stock        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Share‑based compensation 4,900 $ 4,100 9,000 8,200
Share-based payment arrangement, nonvested award, vested fair value     16,600 $ 15,600
Share-based payment arrangement, nonvested award, excluding option, cost not yet recognized, amount $ 40,500   $ 40,500  
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition (in years)     2 years 8 months 12 days  
Restricted Stock | Minimum        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Vesting period (in years)     3 years  
Restricted Stock | Maximum        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Vesting period (in years)     5 years  
Restricted Stock | Main Street Capital Corporation 2022 Equity and Incentive Plan | Minimum        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Vesting period (in years)     3 years  
Restricted Stock | Main Street Capital Corporation 2022 Equity and Incentive Plan | Maximum        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Vesting period (in years)     5 years