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Financial Highlights - Summary (Details) $ / shares in Units, € in Thousands, £ in Thousands, $ in Thousands | 12 Months Ended |  |
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Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2022 GBP (£) shares | Dec. 31, 2022 EUR (€) shares | Dec. 31, 2021 GBP (£) shares
Investment Company, Financial Highlights [Roll Forward] |  |  |  |  |  |  |  |
Net asset value, beginning balance (in dollars per share) | $ / shares | $ 13.49 | $ 12.62 | $ 13.26 | $ 13.22 | $ 13.63 |  |  |
Net investment income (in dollars per share) | $ / shares | 1.18 | 1.21 | 1.20 | 1.37 | 1.39 |  |  |
Net realized and unrealized (losses) gains (in dollars per share) | $ / shares | (0.43) | 0.86 | (0.60) | 0.03 | (0.44) |  |  |
Total net increase (in dollars per share) | $ / shares | 0.75 | 2.07 | 0.60 | 1.40 | 0.95 |  |  |
Distributions declared to stockholders from net investment income (in dollars per share) | $ / shares | (1.22) | (1.20) | (1.24) | (1.36) | (1.36) |  |  |
Net asset value, ending balance (in dollars per share) | $ / shares | 13.02 | 13.49 | 12.62 | 13.26 | 13.22 |  |  |
Per share market value (in dollars per share) | $ / shares | $ 12.37 | $ 13.70 | $ 11.36 | $ 13.74 | $ 12.58 |  |  |
Total return based on market value | (0.56%) | 31.91% | (5.24%) | 20.45% | 2.70% |  |  |
Total return based on net asset value | 5.71% | 16.97% | 5.52% | 10.90% | 7.16% |  |  |
Shares outstanding at end of period (in shares) | shares | 100,937,026 | 97,907,441 | 96,827,342 | 96,827,342 | 76,106,372 | 100,937,026 | 100,937,026 | 97,907,441
Average weighted shares outstanding for the period (in shares) | shares | 100,202,847 | 96,952,959 | 96,827,342 | 85,209,378 | 76,022,375 |  |  |
Average net assets for the period | $ 1,344,266 | $ 1,261,338 | $ 1,168,043 | $ 1,154,615 | $ 1,026,313 |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |
Net investment income | 8.82% | 9.32% | 10.05% | 10.15% | 10.33% |  |  |
Total expenses, before waivers/reimbursements | 13.35% | 13.11% | 14.56% | 14.87% | 12.90% |  |  |
Total expenses, net of waivers/reimbursements | 13.01% | 12.05% | 13.39% | 13.80% | 12.22% |  |  |
Asset coverage ratio | 177.42% | 181.21% | 180.68% | 173.98% | 181.37% | 177.42% | 177.42% | 181.21%
Portfolio turnover | 18.01% | 35.33% | 15.43% | 11.58% | 36.75% |  |  |
Common stock issuances (in dollars per share) | $ / shares | $ 0.01 | $ (0.01) | $ 0.00 | $ 0.08 | $ 0.00 |  |  |
Convertible Notes |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |
Average debt outstanding | $ 228,806 | $ 201,250 | $ 201,250 | $ 234,332 | $ 197,058 |  |  |
SBA-guaranteed debentures |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |
Average debt outstanding | 300,000 | 300,000 | 285,852 | 179,408 | 158,471 |  |  |
Unsecured Notes |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |
Average debt outstanding | 526,829 | 516,611 | 453,250 | 414,949 | 266,296 |  |  |
Holdings Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |
Credit facility outstanding balance | 618,963 | 545,263 | 450,163 |  |  |  |  |
Holdings Credit Facility | Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |
Average debt outstanding | 581,367 | 478,016 | 526,645 | 598,129 | 384,433 |  |  |
NMFC Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |
Credit facility outstanding balance | 40,359 | 127,192 | 165,500 |  |  | £ 22,900 | € 700 | £ 16,400
NMFC Credit Facility | Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |
Average debt outstanding | 133,053 | 132,685 | 155,497 | 105,533 | 117,719 |  |  |
DB Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |
Credit facility outstanding balance | 186,400 | 226,300 | 244,000 |  |  |  |  |
DB Credit Facility | Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |
Average debt outstanding | 209,898 | 209,307 | 233,649 | 113,967 | 49,833 |  |  |
NMNLC Credit Facility | Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |
Average debt outstanding | 0 | 0 | 0 | 1,471 | 3,570 |  |  |
NMNLC Credit Facility II | Revolving Credit Facility |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |
Credit facility outstanding balance | 3,785 | 15,200 |  |  |  |  |  |
NMNLC Credit Facility II | Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |
Ratio to average net assets: |  |  |  |  |  |  |  |
Average debt outstanding | $ 7,195 | $ 3,501 | $ 0 | $ 0 | $ 0 |  |  |

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