SHARE-BASED COMPENSATION - Narrative (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2023 |
Jun. 30, 2022 |
Jun. 30, 2023 |
Jun. 30, 2022 |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] | ||||
| Share‑based compensation | $ 4,087 | $ 3,596 | $ 8,187 | $ 6,414 |
| Share-based payment arrangement, nonvested award, vested fair value | $ 15,600 | 10,300 | ||
| Restricted Stock | ||||
| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] | ||||
| Vesting period | 3 years | |||
| Share‑based compensation | 4,100 | $ 3,600 | $ 8,200 | $ 6,400 |
| Share-based payment arrangement, nonvested award, excluding option, cost not yet recognized, amount | $ 34,400 | $ 34,400 | ||
| Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition | 2 years 8 months 12 days | |||
| Restricted Stock | Main Street Capital Corporation 2022 Equity and Incentive Plan | ||||
| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] | ||||
| Vesting period | 3 years | |||
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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