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Financial Highlights (Details) $ / shares in Units, € in Thousands, £ in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) $ / shares shares	Jun. 30, 2022 USD ($) $ / shares shares	Jun. 30, 2023 USD ($) $ / shares shares	Jun. 30, 2022 USD ($) $ / shares shares	Jun. 30, 2023 GBP (£) shares	Jun. 30, 2023 EUR (€) shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2022 GBP (£) shares	Dec. 31, 2022 EUR (€) shares	Jun. 30, 2022 GBP (£) shares	Jun. 30, 2022 EUR (€) 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			0.77	0.61
Net realized and unrealized (losses) gains (in dollars per share) | $ / shares			0.02	(0.08)
Total net increase (in dollars per share) | $ / shares			0.79	0.53
Distributions declared to stockholders from net investment income (in dollars per share) | $ / shares			(0.67)	(0.60)
Net asset value, ending balance (in dollars per share) | $ / shares	$ 13.14	$ 13.42	13.14	13.42
Per share market value (in dollars per share) | $ / shares	$ 12.44	$ 11.91	$ 12.44	$ 11.91
Total return based on market value			6.04%	(9.00%)
Total return based on net asset value			6.09%	3.95%
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	100,937,026	100,716,928	100,716,928
Average weighted shares outstanding for the period - basic (in shares) | shares	100,937,026	100,596,188	100,937,026	99,510,862
Average net assets for the period			$ 1,320,680	$ 1,346,043
Ratio to average net assets:
Net investment income			11.88%	9.13%
Total expenses, before waivers/reimbursements			16.99%	12.42%
Total expenses, net of waivers/reimbursements			16.66%	12.05%
Asset coverage ratio	181.68%		181.68%		181.68%	181.68%				178.75%	178.75%
Portfolio turnover			3.84%	9.10%
Unsecured Notes
Ratio to average net assets:
Average debt outstanding	$ 439,852	$ 524,687	$ 455,091	$ 518,130
SBA-guaranteed debentures
Ratio to average net assets:
Average debt outstanding	300,000	300,000	300,000	300,000
Convertible Notes
Ratio to average net assets:
Average debt outstanding	376,816	201,250	352,949	201,250
Holdings Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	574,263		574,263				$ 618,963
Holdings Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	574,263		574,263				618,963
Holdings Credit Facility | Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Average debt outstanding	612,623	583,817	623,325	567,033
DB Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	186,400		186,400				186,400
DB Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	186,400		186,400				186,400
DB Credit Facility | Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Average debt outstanding	186,400	217,157	186,400	227,156
NMFC Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	91,290		91,290				40,359
NMFC Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	91,290		91,290		£ 22,850	€ 700	40,359	£ 22,850	€ 700	£ 18,800	€ 0
NMFC Credit Facility | Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Average debt outstanding	69,445	144,278	85,148	148,401
NMNLC Credit Facility II
Ratio to average net assets:
Credit facility outstanding balance	2,926		2,926				$ 3,785
NMNLC Credit Facility II | Revolving Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	2,926		2,926
NMNLC Credit Facility II | Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Average debt outstanding	$ 2,386	$ 9,747	$ 2,678	$ 12,459

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