Quarterly report pursuant to Section 13 or 15(d)

SHARE-BASED COMPENSATION - Narrative (Details)

v3.24.3
SHARE-BASED COMPENSATION - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Share‑based compensation $ 4,868 $ 4,164 $ 13,853 $ 12,351
Restricted Stock        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Share‑based compensation 4,900 $ 4,200 13,900 12,400
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 $ 35,500   $ 35,500  
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition (in years)     2 years 7 months 6 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