Quarterly report pursuant to Section 13 or 15(d)

SHARE-BASED COMPENSATION - Narrative (Details)

v3.24.1.1.u2
SHARE-BASED COMPENSATION - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]    
Share‑based compensation $ 4,103,000 $ 4,100,000
Restricted Stock    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]    
Share‑based compensation 4,100,000 $ 4,100,000
Share-based payment arrangement, nonvested award, vested fair value 0  
Share-based payment arrangement, nonvested award, excluding option, cost not yet recognized, amount $ 22,300,000  
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition (in years) 2 years 2 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