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Financial Highlights (Details) $ / shares in Units, € in Thousands, £ in Thousands, $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2023 USD ($) $ / shares shares | Mar. 31, 2022 USD ($) $ / shares shares | Mar. 31, 2023 GBP (£) shares | Mar. 31, 2023 EUR (€) shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2022 GBP (£) shares | Dec. 31, 2022 EUR (€) shares | Mar. 31, 2022 GBP (£) shares | Mar. 31, 2022 EUR (€) shares | Mar. 31, 2022 $ / shares
Investment Company, Financial Highlights [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net asset value, beginning balance (in dollars per share) | $ / shares | $ 13.02 | $ 13.49 |  |  |  |  |  |  |  |
Net investment income (in dollars per share) | $ / shares | 0.38 | 0.30 |  |  |  |  |  |  |  |
Net realized and unrealized (losses) gains (in dollars per share) | $ / shares | 0.06 | 0.07 |  |  |  |  |  |  |  |
Total net increase (in dollars per share) | $ / shares | 0.44 | 0.37 |  |  |  |  |  |  |  |
Distributions declared to stockholders from net investment income (in dollars per share) | $ / shares | (0.32) | (0.30) |  |  |  |  |  |  |  |
Net asset value, ending balance (in dollars per share) | $ / shares | 13.14 | $ 13.56 |  |  |  |  |  |  |  |
Per share market value (in dollars per share) | $ / shares | $ 12.17 |  |  |  |  |  |  |  |  | $ 13.85
Total return based on market value | 0.94% | 3.28% |  |  |  |  |  |  |  |
Total return based on net asset value | 3.39% | 2.76% |  |  |  |  |  |  |  |
Shares outstanding at end of period (in shares) | shares | 100,937,026 |  | 100,937,026 | 100,937,026 | 100,937,026 | 100,937,026 | 100,937,026 | 99,498,562 | 99,498,562 |
Average weighted shares outstanding for the period - basic (in shares) | shares | 100,937,026 | 98,413,476 |  |  |  |  |  |  |  |
Average net assets for the period | $ 1,314,609 | $ 1,321,557 |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |  |  |
Net investment income | 11.76% | 9.08% |  |  |  |  |  |  |  |
Total expenses, before waivers/reimbursements | 16.85% | 12.38% |  |  |  |  |  |  |  |
Total expenses, net of waivers/reimbursements | 16.52% | 11.98% |  |  |  |  |  |  |  |
Asset coverage ratio | 177.55% |  | 177.55% | 177.55% |  |  |  | 181.26% | 181.26% |
Portfolio turnover | 2.10% | 2.94% |  |  |  |  |  |  |  |
Unsecured Notes |  |  |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |  |  |
Average debt outstanding | $ 471,500 | $ 511,500 |  |  |  |  |  |  |  |
SBA-guaranteed debentures |  |  |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |  |  |
Average debt outstanding | 300,000 | 300,000 |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |  |  |
Average debt outstanding | 328,816 | 201,250 |  |  |  |  |  |  |  |
Holdings Credit Facility |  |  |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |  |  |
Credit facility outstanding balance | 614,663 |  |  |  | $ 618,963 |  |  |  |  |
Holdings Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |  |  |
Credit facility outstanding balance | 614,663 |  |  |  | 618,963 |  |  |  |  |
Holdings Credit Facility | Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |  |  |
Average debt outstanding | 634,146 | 550,063 |  |  |  |  |  |  |  |
DB Credit Facility |  |  |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |  |  |
Credit facility outstanding balance | 186,400 |  |  |  | 186,400 |  |  |  |  |
DB Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |  |  |
Credit facility outstanding balance | 186,400 |  |  |  | 186,400 |  |  |  |  |
DB Credit Facility | Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |  |  |
Average debt outstanding | 186,400 | 237,267 |  |  |  |  |  |  |  |
NMFC Credit Facility |  |  |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |  |  |
Credit facility outstanding balance | 87,949 |  |  |  | 40,359 |  |  |  |  |
NMFC Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |  |  |
Credit facility outstanding balance | 87,949 |  | £ 22,850 | € 700 | 40,359 | £ 22,850 | € 700 | £ 17,400 | € 0 |
NMFC Credit Facility | Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |  |  |
Average debt outstanding | 101,025 | 152,570 |  |  |  |  |  |  |  |
NMNLC Credit Facility II |  |  |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |  |  |
Credit facility outstanding balance | 3,120 |  |  |  | $ 3,785 |  |  |  |  |
NMNLC Credit Facility II | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |  |  |
Credit facility outstanding balance | 3,120 |  |  |  |  |  |  |  |  |
NMNLC Credit Facility II | Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |  |  |
Average debt outstanding | $ 2,973 | $ 15,200 |  |  |  |  |  |  |  |

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