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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 172 Months Ended
Sep. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Cash flows from operating activities              
Net increase in net assets resulting from operations $ 12,342 $ 23,517 $ 23,894 $ 28,084 $ 43,734 $ 86,762  
Adjustments to reconcile net increase in net assets resulting from operations to net cash (used in) provided by operating activities:              
Net realized (gains) losses on investments         (51,223) 43,524  
Net realized losses on translation of assets and liabilities in foreign currencies 0   1,455   0 1,455  
Net change in unrealized depreciation (appreciation) of investments and New Mountain Net Lease Corporation         111,171 (23,368)  
Net change in unrealized appreciation on translation of assets and liabilities in foreign currencies 120   (1,690)   (482) (1,796)  
Net change in unrealized depreciation of securities purchased under collateralized agreements to resell 0   0   0 3,000  
Amortization of purchase discount         (7,482) (5,774)  
Amortization of deferred financing costs         6,866 7,502  
Net change due to hedging activity         (871) 635  
Non-cash investment income         (40,281) (47,921)  
(Increase) decrease in operating assets:              
Cash paid for purchase of non-controlling interest in New Mountain Net Lease Corporation         0 (4,666)  
Cash distribution received for purchase of non-controlling interest in New Mountain Net Lease Corporation         0 244  
Cash received for purchase of undrawn portion of revolving credit or delayed draw facilities         236 447  
Deferred tax asset         0 594  
Interest and dividend receivable         (1,771) (1,809)  
Receivable from affiliates         (121) (57)  
Other assets         1,496 (2,832)  
(Decrease) increase in operating liabilities:              
Management fee payable         (848) 614  
Incentive fee payable         (5,824) 266  
Payable for unsettled securities purchased         10,412 0  
Interest payable         959 (1,953)  
Deferred tax liability         68 1,100  
Payable to broker         10,230 10,370  
Other liabilities         1,889 (20)  
Net cash flows provided by (used in) operating activities         217,393 (153,184)  
Cash flows from financing activities              
Net proceeds from shares sold         0 67,691 $ 1,034,550
Repurchase of shares under Old Repurchase Program         (37,253) 0  
Offering costs paid         (76) (336)  
Distributions paid         (102,833) (111,602)  
Repayment of 2022 Convertible Notes         (1,228) 0  
Proceeds from Unsecured Notes         0 594,981  
Repayment of Unsecured Notes         0 (116,500)  
Repayment of SBA-guaranteed debentures         (103,795) 0  
Distributions related to non-controlling interest in NMNLC         (270) (528)  
Deferred financing costs paid         (2,436) (10,832)  
Net cash flows used in financing activities         (234,191) 144,965  
Net increase (decrease) in cash and cash equivalents         (16,798) (8,219)  
Effect of foreign exchange rate changes on cash and cash equivalents         162 72  
Cash and cash equivalents at the beginning of the period   $ 80,320   $ 70,090 80,320 70,090  
Cash and cash equivalents at the end of the period $ 63,684   $ 61,943   63,684 61,943 $ 63,684
Supplemental disclosure of cash flow information              
Cash interest paid         82,554 93,432  
Income taxes (received) paid         (345) 142  
Non-cash operating activities:              
Non-cash activity on investments         61,007 26,350  
Non-cash financing activities:              
Conversion of 2022 Convertible Notes to Shares         7 0  
Accrual for offering costs         41 159  
Accrual for deferred financing costs         45 708  
Investments including delayed draw facilities              
(Increase) decrease in operating assets:              
Cash paid for purchase of investments         (370,769) (772,915)  
Investments excluding drawn revolvers              
(Increase) decrease in operating assets:              
Proceeds from sale of investment         519,148 557,709  
Drawn revolving credit facilities              
(Increase) decrease in operating assets:              
Cash paid for purchase of investments         0 (48)  
Drawn revolvers              
(Increase) decrease in operating assets:              
Cash paid for purchase of investments         (25,603) (29,475)  
Proceeds from sale of investment         15,601 24,893  
2022 Convertible Notes              
Adjustments to reconcile net increase in net assets resulting from operations to net cash (used in) provided by operating activities:              
Amortization of debt discount (premium)         (74) (87)  
Unsecured Notes              
Adjustments to reconcile net increase in net assets resulting from operations to net cash (used in) provided by operating activities:              
Amortization of debt discount (premium)         932 422  
Holdings Credit Facility              
Cash flows from financing activities              
Proceeds from credit facility         378,500 558,400  
Repayments of credit facility         (364,800) (665,900)  
NMFC Credit Facility              
Cash flows from financing activities              
Proceeds from credit facility         0 112,386  
Repayments of credit facility         0 (96,450)  
Repayment of DB Credit Facility              
Cash flows from financing activities              
Repayments of credit facility         0 (186,400)  
NMNLC Credit Facility II              
Cash flows from financing activities              
Proceeds from credit facility         0 7,710  
Repayments of credit facility         $ 0 $ (7,655)