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Agreements - Management Fees and Incentive Fees (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Related Party Transaction [Line Items] |  |  |
Management fee | $ 11,638 | $ 11,553 |
Less: management fee waiver | (1,063) | (1,092) |
Total management fee | 10,575 | 10,461 |
Incentive fee | 9,597 | 7,477 |
Incentive fee payable | 9,597 |  | $ 6,296
Incentive fee, excluding accrued capital gains incentive fees |  |  |
Related Party Transaction [Line Items] |  |  |
Incentive fee | 9,597 | 7,477 |
Accrued capital gains incentive fees |  |  |
Related Party Transaction [Line Items] |  |  |
Incentive fee | 0 | 0 |
Incentive fee payable | $ 0 | $ 0 |

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- Definition Investment Company, Contractual Fee Waived, Management Fee + References No definition available. + Details
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Namespace Prefix: | nmfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Investment Company, Management Fee Expense, After Reduction Of Fee Waiver + References No definition available. + Details
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Namespace Prefix: | nmfc_
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- References No definition available. + Details
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Namespace Prefix: | us-gaap-supplement_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of expense for incentive rights held by the managing member or general partner, of limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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- Definition Amount of expenses related to the managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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