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Consolidated Schedule of Investments (Parenthetical)
€ in Thousands, £ in Thousands, $ in Thousands
 3 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
numberOfAgreement
investment
Dec. 31, 2021
USD ($)
Dec. 31, 2023
USD ($)
investment
numberOfAgreement
Dec. 31, 2022
USD ($)
numberOfAgreement
investment
Dec. 31, 2021
USD ($)
Dec. 31, 2023
GBP (£)
investment
numberOfAgreement
Dec. 31, 2023
EUR (€)
investment
numberOfAgreement
Sep. 30, 2023
USD ($)
Dec. 31, 2022
GBP (£)
numberOfAgreement
investment
Dec. 31, 2022
EUR (€)
numberOfAgreement
investment
Jun. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
May 03, 2013
USD ($)
Number of collateralized agreements | numberOfAgreement 1   1 1   1 1   1 1        
Cost basis of securities purchased under collateralized agreements to resell $ 30,000   $ 30,000 $ 30,000                    
Fair value of securities purchased under collateralized agreements to resell 16,539   16,500 16,539                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     3,221,247 [1]                      
Net Change In Unrealized Appreciation (Depreciation)     10,416 (85,249) $ 92,305                  
Fair Value, Ending Balance 3,221,247 [1]   3,011,322 [2] 3,221,247 [1]                    
Net Realized Gains (Losses)     $ (32,841) $ 53,530 (3,849)                  
Investments at fair value that are non-qualifying assets as a percentage of total assets     14.80%     14.80% 14.80%              
Percent of Total Investments at Fair Value     100.00% 100.00%                    
Food & Beverage                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 22,055                      
Investments at fair value | Industry Type | Food & Beverage                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Percent of Total Investments at Fair Value     0.73%                      
QID NGL, LLC | Common Class B                            
Ownership percentage     4.60% 4.60%                    
QID TRH Holdings, LLC | Common Class B                            
Ownership percentage     97.00% 97.00%                    
NMFC Senior Loan Program III LLC                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Dividend Income     $ 20,038 $ 17,485 16,712                  
NMFC Senior Loan Program IV LLC                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Dividend Income   $ 7,767 15,483 13,173                    
Non-controlled/Affiliated                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     130,787 [3] 134,775                    
Gross Additions     22,390 [4] 5,168 [5]                    
Gross Redemptions     (466) [6] 0 [7]                    
Net Change In Unrealized Appreciation (Depreciation)     (19,052) (9,156)                    
Fair Value, Ending Balance 130,787 [3] 134,775 133,659 130,787 [3] 134,775                  
Net Realized Gains (Losses)     0 0                    
Interest Income     4,134 2,105                    
Dividend Income     4,625 4,109                    
Other Income     251 250 345                  
Non-controlled/Affiliated | Permian Holdco 3, Inc. / Permian Trust                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 0                    
Gross Additions     15,581 [4] 0 [5]                    
Gross Redemptions     (459) [6] 0 [7]                    
Net Change In Unrealized Appreciation (Depreciation)     2,751 0                    
Fair Value, Ending Balance 0 0 17,873 0 0                  
Net Realized Gains (Losses)     0 0                    
Interest Income     1,084 0                    
Dividend Income     0 0                    
Other Income     0 0                    
Non-controlled/Affiliated | Sierra Hamilton Holdings Corporation                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     4,000 4,000                    
Gross Additions     2 [4] 0 [5]                    
Gross Redemptions     (7) [6] 0 [7]                    
Net Change In Unrealized Appreciation (Depreciation)     (1,995) 0                    
Fair Value, Ending Balance 4,000 4,000 2,000 4,000 4,000                  
Net Realized Gains (Losses)     0 0                    
Interest Income     2 0                    
Dividend Income     0 0                    
Other Income     1 0                    
Non-controlled/Affiliated | TVG-Edmentum Holdings, LLC / Edmentum Ultimate Holdings, LLC                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     126,787 130,775                    
Gross Additions     6,807 [4] 5,168 [5]                    
Gross Redemptions     0 [6] 0 [7]                    
Net Change In Unrealized Appreciation (Depreciation)     (19,808) (9,156)                    
Fair Value, Ending Balance 126,787 130,775 113,786 126,787 130,775                  
Net Realized Gains (Losses)     0 0                    
Interest Income     3,048 2,105                    
Dividend Income     4,625 4,109                    
Other Income     250 250                    
Controlled                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     690,035 755,810                    
Gross Additions     40,458 [8] 22,952 [9]                    
Gross Redemptions     (44,109) [10] (94,946) [11]                    
Net Change In Unrealized Appreciation (Depreciation)     (18,588) 6,219                    
Fair Value, Ending Balance 690,035 755,810 667,796 690,035 755,810                  
Net Realized Gains (Losses)     16,413 53,440                    
Interest Income     20,829 13,954                    
Dividend Income     51,208 47,512                    
Other Income     5,315 7,146 4,580                  
Controlled | Edmentum Inc.                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 0                    
Gross Additions       0 [9]                    
Gross Redemptions       0 [11]                    
Net Change In Unrealized Appreciation (Depreciation)       0                    
Fair Value, Ending Balance 0 0   0 0                  
Net Realized Gains (Losses)       54                    
Interest Income       0                    
Dividend Income       0                    
Other Income       0                    
Controlled | National HME, Inc./NHME Holdings Corp.                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     5,381                      
Gross Additions     0 [8]                      
Gross Redemptions     (17,404) [10]                      
Net Change In Unrealized Appreciation (Depreciation)     15,023                      
Fair Value, Ending Balance 5,381   3,000 5,381                    
Net Realized Gains (Losses)     (17,404)                      
Interest Income     0                      
Dividend Income     0                      
Other Income     0                      
Controlled | National HME, Inc. And NMHE Holdings Corp., Including Netting                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     5,381 27,347                    
Gross Additions       (8,161) [9]                    
Gross Redemptions       0 [11]                    
Net Change In Unrealized Appreciation (Depreciation)       (13,805)                    
Fair Value, Ending Balance 5,381 27,347   5,381 27,347                  
Net Realized Gains (Losses)       0                    
Interest Income       (9,661)                    
Dividend Income       0                    
Other Income       (1,500)                    
Controlled | New Benevis Topco, LLC / New Benevis Holdco, Inc.                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     114,146 109,595                    
Gross Additions     26,153 [8] 5,914 [9]                    
Gross Redemptions     0 [10] 0 [11]                    
Net Change In Unrealized Appreciation (Depreciation)     (4,898) (1,363)                    
Fair Value, Ending Balance 114,146 109,595 135,401 114,146 109,595                  
Net Realized Gains (Losses)     0 0                    
Interest Income     11,632 8,057                    
Dividend Income     0 0                    
Other Income     1,500 1,500                    
Controlled | New Permian Holdco, Inc. / New Permian Holdco, L.L.C.                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     57,564 34,759                    
Gross Additions     5,606 [8] 7,805 [9]                    
Gross Redemptions     0 [10] 0 [11]                    
Net Change In Unrealized Appreciation (Depreciation)     0 15,000                    
Fair Value, Ending Balance 57,564 34,759 63,170 57,564 34,759                  
Net Realized Gains (Losses)     0 0                    
Interest Income     5,197 4,504                    
Dividend Income     0 0                    
Other Income     506 511                    
Controlled | NM APP CANADA CORP                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 9,422                    
Gross Additions     0 [8] 0 [9]                    
Gross Redemptions     0 [10] (7,345) [11]                    
Net Change In Unrealized Appreciation (Depreciation)     7 (2,077)                    
Fair Value, Ending Balance 0 9,422 7 0 9,422                  
Net Realized Gains (Losses)     0 4,212                    
Interest Income     0 0                    
Dividend Income     0 620                    
Other Income     0 713                    
Controlled | NM APP US LLC                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 14,891                    
Gross Additions       0 [9]                    
Gross Redemptions       (5,080) [11]                    
Net Change In Unrealized Appreciation (Depreciation)       (9,811)                    
Fair Value, Ending Balance 0 14,891   0 14,891                  
Net Realized Gains (Losses)       4,489                    
Interest Income       0                    
Dividend Income       255                    
Other Income       483                    
Controlled | NM CLFX LP                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     16,172 24,676                    
Gross Additions     0 [8] 0 [9]                    
Gross Redemptions     (259) [10] 0 [11]                    
Net Change In Unrealized Appreciation (Depreciation)     (4,182) (8,504)                    
Fair Value, Ending Balance 16,172 24,676 11,731 16,172 24,676                  
Net Realized Gains (Losses)     0 0                    
Interest Income     0 0                    
Dividend Income     1,252 1,596                    
Other Income     0 0                    
Controlled | NM DRVT LLC                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 7,984                    
Gross Additions       0 [9]                    
Gross Redemptions       (5,152) [11]                    
Net Change In Unrealized Appreciation (Depreciation)       (2,832)                    
Fair Value, Ending Balance 0 7,984   0 7,984                  
Net Realized Gains (Losses)       3,439                    
Interest Income       0                    
Dividend Income       173                    
Other Income       475                    
Controlled | NM JRA LLC                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 3,996                    
Gross Additions       0 [9]                    
Gross Redemptions       (2,043) [11]                    
Net Change In Unrealized Appreciation (Depreciation)       (1,953)                    
Fair Value, Ending Balance 0 3,996   0 3,996                  
Net Realized Gains (Losses)       2,049                    
Interest Income       0                    
Dividend Income       72                    
Other Income       188                    
Controlled | NM GLCR LP                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 50,687                    
Gross Additions       0 [9]                    
Gross Redemptions       (14,750) [11]                    
Net Change In Unrealized Appreciation (Depreciation)       (35,937)                    
Fair Value, Ending Balance 0 50,687   0 50,687                  
Net Realized Gains (Losses)       35,713                    
Interest Income       0                    
Dividend Income       400                    
Other Income       2,150                    
Controlled | NM KRLN LLC                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 244                    
Gross Additions       97 [9]                    
Gross Redemptions       (9,319) [11]                    
Net Change In Unrealized Appreciation (Depreciation)       8,978                    
Fair Value, Ending Balance 0 244   0 244                  
Net Realized Gains (Losses)       (9,318)                    
Interest Income       0                    
Dividend Income       0                    
Other Income       0                    
Controlled | NM NL Holdings, L.P.                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     94,305 107,870                    
Gross Additions     0 [8] 53 [9]                    
Gross Redemptions     0 [10] (10,885) [11]                    
Net Change In Unrealized Appreciation (Depreciation)     1,766 (2,733)                    
Fair Value, Ending Balance 94,305 107,870 96,071 94,305 107,870                  
Net Realized Gains (Losses)     0 0                    
Interest Income     0 0                    
Dividend Income     8,191 8,453                    
Other Income     0 0                    
Controlled | NM GP Holdco, LLC                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     1,028 1,197                    
Gross Additions     0 [8] 1 [9]                    
Gross Redemptions     0 [10] (138) [11]                    
Net Change In Unrealized Appreciation (Depreciation)     20 (32)                    
Fair Value, Ending Balance 1,028 1,197 1,048 1,028 1,197                  
Net Realized Gains (Losses)     0 0                    
Interest Income     0 0                    
Dividend Income     88 94                    
Other Income     0 0                    
Controlled | NM YI LLC                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     9,481 8,286                    
Gross Additions     0 [8] 0 [9]                    
Gross Redemptions     0 [10] 0 [11]                    
Net Change In Unrealized Appreciation (Depreciation)     69 1,195                    
Fair Value, Ending Balance 9,481 8,286 9,550 9,481 8,286                  
Net Realized Gains (Losses)     0 0                    
Interest Income     0 0                    
Dividend Income     853 828                    
Other Income     0 0                    
Controlled | NMFC Senior Loan Program III LLC                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     140,000 140,000                    
Gross Additions     0 [8] 0 [9]                    
Gross Redemptions     0 [10] 0 [11]                    
Net Change In Unrealized Appreciation (Depreciation)     0 0                    
Fair Value, Ending Balance 140,000 140,000 140,000 140,000 140,000                  
Net Realized Gains (Losses)     0 0                    
Interest Income     0 0                    
Dividend Income     20,038 17,485                    
Other Income     0 0                    
Controlled | NMFC Senior Loan Program IV LLC                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     112,400 112,400                    
Gross Additions     0 [8] 0 [9]                    
Gross Redemptions     0 [10] 0 [11]                    
Net Change In Unrealized Appreciation (Depreciation)     0 0                    
Fair Value, Ending Balance 112,400 112,400 112,400 112,400 112,400                  
Net Realized Gains (Losses)     0 0                    
Interest Income     0 0                    
Dividend Income     15,483 13,173                    
Other Income     0 0                    
Controlled | Haven Midstream LLC / Haven Midstream Holdings LLC / QID TRH Holdings LLC                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     35,788 34,821                    
Gross Additions     0 [8] 3,865 [9]                    
Gross Redemptions     0 [10] (38,685) [11]                    
Net Change In Unrealized Appreciation (Depreciation)     (32,369) 35,787                    
Fair Value, Ending Balance 35,788 34,821 3,419 35,788 34,821                  
Net Realized Gains (Losses)     33,815 12,802                    
Interest Income     0 6,316                    
Dividend Income     0 0                    
Other Income     2,041 1,902                    
Controlled | UniTek Global Services, Inc.                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     103,770 67,635                    
Gross Additions     8,699 [8] 13,378 [9]                    
Gross Redemptions     (26,446) [10] (1,549) [11]                    
Net Change In Unrealized Appreciation (Depreciation)     5,976 24,306                    
Fair Value, Ending Balance 103,770 $ 67,635 91,999 103,770 $ 67,635                  
Net Realized Gains (Losses)     2 0                    
Interest Income     4,000 4,738                    
Dividend Income     5,303 4,363                    
Other Income     1,268 724                    
Investment, Identifier [Axis]: AAC Lender Holdings, LLC, Ordinary shares                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [12],[13],[14]                      
Fair Value, Ending Balance 0 [12],[13],[14]   0 [15],[16],[17] 0 [12],[13],[14]                    
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 1                            
Principal amount or par value     14,011 [16],[17],[18]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     13,420 [16],[17]                      
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 2                            
Principal amount or par value     5,495 [16],[18],[19]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     5,263 [16],[19]                      
Investment, Identifier [Axis]: AAH Topco, LLC, First Lien - Drawn 1                            
Principal amount or par value     $ 22,965 [16],[18],[20],[21]                      
Spread     5.50% [16],[20],[21]     5.50% [16],[20],[21] 5.50% [16],[20],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 22,965 [16],[20],[21]                      
Investment, Identifier [Axis]: AAH Topco, LLC, First Lien - Drawn 2                            
Principal amount or par value     $ 7,450 [16],[18],[19],[20]                      
Spread     5.50% [16],[19],[20]     5.50% [16],[19],[20] 5.50% [16],[19],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 7,450 [16],[19],[20]                      
Investment, Identifier [Axis]: AAH Topco, LLC, First Lien 1                            
Principal amount or par value     $ 20,426 [16],[18],[22]                      
Spread     5.50% [16],[22]     5.50% [16],[22] 5.50% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 20,426 [16],[22]                      
Investment, Identifier [Axis]: AAH Topco, LLC, First Lien 2                            
Principal amount or par value     $ 9,698 [16],[18],[19]                      
Spread     5.50% [16],[19]     5.50% [16],[19] 5.50% [16],[19]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 9,698 [16],[19]                      
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Drawn 1                            
Principal amount or par value $ 12,357 [13],[14],[23],[24]     $ 12,357 [13],[14],[23],[24]                    
Spread 5.50% [13],[14],[24]     5.50% [13],[14],[24]         5.50% [13],[14],[24] 5.50% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     12,204 [13],[14],[24]                      
Fair Value, Ending Balance $ 12,204 [13],[14],[24]     $ 12,204 [13],[14],[24]                    
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Drawn 2                            
Principal amount or par value $ 4,009 [13],[23],[24],[25]     $ 4,009 [13],[23],[24],[25]                    
Spread 5.50% [13],[24],[25]     5.50% [13],[24],[25]         5.50% [13],[24],[25] 5.50% [13],[24],[25]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     3,959 [13],[24],[25]                      
Fair Value, Ending Balance $ 3,959 [13],[24],[25]     $ 3,959 [13],[24],[25]                    
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn                            
Principal amount or par value 4,231 [13],[14],[23],[24]   3,659 [16],[17],[18],[20] 4,231 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (52) [13],[14],[24]                      
Fair Value, Ending Balance (52) [13],[14],[24]   0 [16],[17],[20] (52) [13],[14],[24]                    
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn 1                            
Principal amount or par value 3,659 [13],[14],[23],[24]     3,659 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (45) [13],[14],[24]                      
Fair Value, Ending Balance (45) [13],[14],[24]     (45) [13],[14],[24]                    
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn 2                            
Principal amount or par value 13,041 [13],[14],[23],[24]     13,041 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (162) [13],[14],[24]                      
Fair Value, Ending Balance (162) [13],[14],[24]     (162) [13],[14],[24]                    
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 1                            
Principal amount or par value $ 20,634 [13],[23],[26]     $ 20,634 [13],[23],[26]                    
Spread 5.50% [13],[26]     5.50% [13],[26]         5.50% [13],[26] 5.50% [13],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     20,378 [13],[26]                      
Fair Value, Ending Balance $ 20,378 [13],[26]     $ 20,378 [13],[26]                    
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 2                            
Principal amount or par value $ 9,797 [13],[23],[25]     $ 9,797 [13],[23],[25]                    
Spread 5.50% [13],[25]     5.50% [13],[25]         5.50% [13],[25] 5.50% [13],[25]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     9,676 [13],[25]                      
Fair Value, Ending Balance $ 9,676 [13],[25]     $ 9,676 [13],[25]                    
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 1                            
Principal amount or par value 12,494 [13],[14],[23]     12,494 [13],[14],[23]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     11,908 [13],[14]                      
Fair Value, Ending Balance 11,908 [13],[14]     11,908 [13],[14]                    
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 2                            
Principal amount or par value 4,900 [13],[23],[25]     4,900 [13],[23],[25]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     4,670 [13],[25]                      
Fair Value, Ending Balance 4,670 [13],[25]     4,670 [13],[25]                    
Investment, Identifier [Axis]: ACI Group Holdings, Inc. First Lien - Drawn 1                            
Principal amount or par value     $ 1,397 [16],[17],[18],[20]                      
Spread     5.50% [16],[17],[20]     5.50% [16],[17],[20] 5.50% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 1,364 [16],[17],[20]                      
Investment, Identifier [Axis]: ACI Group Holdings, Inc. First Lien - Drawn 2                            
Principal amount or par value     $ 353 [16],[17],[18],[20]                      
Spread     5.50% [16],[17],[20]     5.50% [16],[17],[20] 5.50% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 345 [16],[17],[20]                      
Investment, Identifier [Axis]: ACI Group Holdings, Inc. First Lien 1                            
Principal amount or par value     $ 22,025 [16],[18],[21]                      
Spread     5.50% [16],[21]     5.50% [16],[21] 5.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 21,498 [16],[21]                      
Investment, Identifier [Axis]: ACI Group Holdings, Inc. First Lien 2                            
Principal amount or par value     $ 3,904 [16],[17],[18]                      
Spread     5.50% [16],[17]     5.50% [16],[17] 5.50% [16],[17]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 3,810 [16],[17]                      
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien                            
Principal amount or par value $ 22,082 [13],[14],[23]     $ 22,082 [13],[14],[23]                    
Spread 4.50% [13],[27],[28]     4.50% [13],[27],[28]         4.50% [13],[27],[28] 4.50% [13],[27],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     21,338 [13],[14]                      
Fair Value, Ending Balance $ 21,338 [13],[14]     $ 21,338 [13],[14]                    
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Drawn 1                            
Principal amount or par value $ 2,840 [13],[14],[23],[24]     $ 2,840 [13],[14],[23],[24]                    
Spread 4.50% [13],[14],[24],[28]     4.50% [13],[14],[24],[28]         4.50% [13],[14],[24],[28] 4.50% [13],[14],[24],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     2,744 [13],[14],[24]                      
Fair Value, Ending Balance $ 2,744 [13],[14],[24]     $ 2,744 [13],[14],[24]                    
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Drawn 2                            
Principal amount or par value $ 259 [13],[14],[23],[24]     $ 259 [13],[14],[23],[24]                    
Spread 5.50% [13],[14],[24]     5.50% [13],[14],[24]         5.50% [13],[14],[24] 5.50% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     250 [13],[14],[24]                      
Fair Value, Ending Balance $ 250 [13],[14],[24]     $ 250 [13],[14],[24]                    
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Undrawn 1                            
Principal amount or par value 2,095 [13],[14],[23],[24]   2,001 [16],[17],[18],[20] 2,095 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (71) [13],[14],[24]                      
Fair Value, Ending Balance (71) [13],[14],[24]   (48) [16],[17],[20] (71) [13],[14],[24]                    
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Undrawn 2                            
Principal amount or par value 5,386 [13],[14],[23],[24]   2,909 [16],[17],[18],[20] 5,386 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (181) [13],[14],[24]                      
Fair Value, Ending Balance (181) [13],[14],[24]   $ (70) [16],[17],[20] $ (181) [13],[14],[24]                    
Investment, Identifier [Axis]: ACI Parent Inc., Preferred shares                            
Preferred equity dividend rate     11.75% 11.75%                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     $ 14,068 [13],[14],[29]                      
Fair Value, Ending Balance 14,068 [13],[14],[29]   15,040 [16],[17] $ 14,068 [13],[14],[29]                    
Investment, Identifier [Axis]: ADG, LLC, Second lien                            
Principal amount or par value 7,430 [13],[14],[23]     7,430 [13],[14],[23]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     4,984 [13],[14]                      
Fair Value, Ending Balance 4,984 [13],[14]     4,984 [13],[14]                    
Investment, Identifier [Axis]: Alegeus Technologies Holdings Corp. First Lien                            
Principal amount or par value     $ 13,444 [16],[18],[22]                      
Spread     8.25% [16],[22]     8.25% [16],[22] 8.25% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 13,444 [16],[22]                      
Investment, Identifier [Axis]: Alegeus Technologies Holdings Corp., First lien                            
Principal amount or par value $ 13,444 [13],[23],[26]     $ 13,444 [13],[23],[26]                    
Spread 8.25% [13],[26]     8.25% [13],[26]         8.25% [13],[26] 8.25% [13],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     13,444 [13],[26]                      
Fair Value, Ending Balance $ 13,444 [13],[26]     $ 13,444 [13],[26]                    
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc. First Lien - Drawn                            
Principal amount or par value     $ 700 [16],[17],[18],[20]                      
Spread     5.50% [16],[17],[20]     5.50% [16],[17],[20] 5.50% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 700 [16],[17],[20]                      
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc. First Lien 1                            
Principal amount or par value     $ 19,159 [16],[18],[21]                      
Spread     5.50% [16],[21]     5.50% [16],[21] 5.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 19,159 [16],[21]                      
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc. First Lien 2                            
Principal amount or par value     $ 5,331 [16],[18],[21]                      
Spread     5.50% [16],[21]     5.50% [16],[21] 5.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 5,331 [16],[21]                      
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Undrawn                            
Principal amount or par value     1,969 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     0 [16],[17],[20]                      
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Undrawn 1                            
Principal amount or par value 1,969 [13],[14],[23],[24]     1,969 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (39) [13],[14],[24]                      
Fair Value, Ending Balance (39) [13],[14],[24]     (39) [13],[14],[24]                    
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Undrawn 2                            
Principal amount or par value 11,718 [13],[14],[23],[24]     11,718 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (234) [13],[14],[24]                      
Fair Value, Ending Balance (234) [13],[14],[24]     (234) [13],[14],[24]                    
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 1                            
Principal amount or par value $ 22,321 [13],[23],[27]     $ 22,321 [13],[23],[27]                    
Spread 5.50% [13],[27]     5.50% [13],[27]         5.50% [13],[27] 5.50% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     21,875 [13],[27]                      
Fair Value, Ending Balance $ 21,875 [13],[27]     $ 21,875 [13],[27]                    
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 2                            
Principal amount or par value $ 4,024 [13],[23],[27]     $ 4,024 [13],[23],[27]                    
Spread 5.50% [13],[27]     5.50% [13],[27]         5.50% [13],[27] 5.50% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     3,943 [13],[27]                      
Fair Value, Ending Balance $ 3,943 [13],[27]     $ 3,943 [13],[27]                    
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.) First Lien 1                            
Principal amount or par value     $ 29,879 [16],[18],[21]                      
Spread     0.50% [16],[21],[30],[31]     0.50% [16],[21],[30],[31] 0.50% [16],[21],[30],[31]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 20,586 [16],[21]                      
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.) First Lien 2                            
Principal amount or par value     $ 1,527 [16],[17],[18]                      
Spread     0.50% [16],[17],[30],[31]     0.50% [16],[17],[30],[31] 0.50% [16],[17],[30],[31]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 0 [16],[17]                      
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.) Subordinated                            
Principal amount or par value     5,230 [16],[17],[18]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     0 [16],[17]                      
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien                            
Principal amount or par value     31,406                      
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien - Undrawn                            
Principal amount or par value 2,652 [12],[13],[14],[23],[24]   2,652 [15],[16],[17],[18],[20] 2,652 [12],[13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [12],[13],[14],[24]                      
Fair Value, Ending Balance 0 [12],[13],[14],[24]   0 [15],[16],[17],[20] 0 [12],[13],[14],[24]                    
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien 1                            
Principal amount or par value $ 28,829 [13],[23],[27]     $ 28,829 [13],[23],[27]                    
Spread 5.75% [13],[27],[28],[32]     5.75% [13],[27],[28],[32]         5.75% [13],[27],[28],[32] 5.75% [13],[27],[28],[32]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     20,599 [13],[27]                      
Fair Value, Ending Balance $ 20,599 [13],[27]     $ 20,599 [13],[27]                    
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien 2                            
Principal amount or par value $ 1,527 [13],[14],[23]     $ 1,527 [13],[14],[23]                    
Spread 13.50% [13],[14],[28],[32]     13.50% [13],[14],[28],[32]         13.50% [13],[14],[28],[32] 13.50% [13],[14],[28],[32]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[14]                      
Fair Value, Ending Balance $ 0 [13],[14]     $ 0 [13],[14]                    
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien, Non-accrual status                            
Principal amount or par value               $ 17,927       $ 13,479    
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), Non-accrual status                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     20,586                      
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), Subordinated                            
Principal amount or par value 5,230 [13],[14],[23]   5,230 5,230 [13],[14],[23]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[14]                      
Fair Value, Ending Balance 0 [13],[14]     0 [13],[14]                    
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), Subordinated, Non-accrual status                            
Principal amount or par value                         $ 5,230  
Investment, Identifier [Axis]: Anaplan, Inc. First Lien                            
Principal amount or par value     $ 10,618 [16],[18],[21]                      
Spread     6.50% [16],[21]     6.50% [16],[21] 6.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 10,618 [16],[21]                      
Investment, Identifier [Axis]: Anaplan, Inc., First lien                            
Principal amount or par value $ 33,618 [13],[23],[27]     $ 33,618 [13],[23],[27]                    
Spread 6.50% [13],[27]     6.50% [13],[27]         6.50% [13],[27] 6.50% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     33,282 [13],[27]                      
Fair Value, Ending Balance $ 33,282 [13],[27]     $ 33,282 [13],[27]                    
Investment, Identifier [Axis]: Ancora Acquisition LLC, Preferred shares                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     158 [13],[33]                      
Fair Value, Ending Balance 158 [13],[33]   0 [16],[34] 158 [13],[33]                    
Investment, Identifier [Axis]: Ansira Holdings, Inc, First lien - Undrawn                            
Principal amount or par value 1,161 [13],[14],[23],[24]     1,161 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[14],[24]                      
Fair Value, Ending Balance 0 [13],[14],[24]     0 [13],[14],[24]                    
Investment, Identifier [Axis]: Ansira Holdings, Inc., First lien - Drawn                            
Principal amount or par value $ 313 [13],[14],[23],[24]     $ 313 [13],[14],[23],[24]                    
Spread 2.00% [13],[14],[24],[28]     2.00% [13],[14],[24],[28]         2.00% [13],[14],[24],[28] 2.00% [13],[14],[24],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     313 [13],[14],[24]                      
Fair Value, Ending Balance $ 313 [13],[14],[24]     $ 313 [13],[14],[24]                    
Investment, Identifier [Axis]: Ansira Holdings, Inc., First lien 1                            
Principal amount or par value 32,953 [13],[23],[26]     32,953 [13],[23],[26]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     14,829 [13],[26]                      
Fair Value, Ending Balance 14,829 [13],[26]     14,829 [13],[26]                    
Investment, Identifier [Axis]: Ansira Holdings, Inc., First lien 2                            
Principal amount or par value 8,316 [23]     8,316 [23]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     $ 3,742                      
Fair Value, Ending Balance $ 3,742     $ 3,742                    
Investment, Identifier [Axis]: Appriss Health Holdings, Inc, Wholly-owned subsidiaries                            
Number of investments held | investment 2   2 2   2 2   2 2        
Investment, Identifier [Axis]: Appriss Health Intermediate Holdings, Inc., Preferred shares                            
Preferred equity dividend rate     11.00% 11.00%                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     $ 2,628 [13],[14],[35]                      
Fair Value, Ending Balance $ 2,628 [13],[14],[35]   2,863 [16],[17] $ 2,628 [13],[14],[35]                    
Investment, Identifier [Axis]: Appriss Health, LLC, First Lien                            
Principal amount or par value     $ 6,188 [16],[18],[22]                      
Spread     6.75% [16],[22]     6.75% [16],[22] 6.75% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 6,188 [16],[22]                      
Investment, Identifier [Axis]: Appriss Health, LLC, First lien                            
Principal amount or par value $ 6,234 [13],[23],[26]     $ 6,234 [13],[23],[26]                    
Spread 7.25% [13],[26]     7.25% [13],[26]         7.25% [13],[26] 7.25% [13],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     6,234 [13],[26]                      
Fair Value, Ending Balance $ 6,234 [13],[26]     $ 6,234 [13],[26]                    
Investment, Identifier [Axis]: Appriss Health, LLC, First lien - Undrawn                            
Principal amount or par value 417 [13],[14],[23],[24]   417 [16],[17],[18],[20] 417 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[14],[24]                      
Fair Value, Ending Balance 0 [13],[14],[24]   0 [16],[17],[20] 0 [13],[14],[24]                    
Investment, Identifier [Axis]: Apptio, Inc., First lien - Drawn                            
Principal amount or par value $ 1,240 [13],[14],[23],[24]     $ 1,240 [13],[14],[23],[24]                    
Spread 6.00% [13],[14],[24]     6.00% [13],[14],[24]         6.00% [13],[14],[24] 6.00% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     1,240 [13],[14],[24]                      
Fair Value, Ending Balance $ 1,240 [13],[14],[24]     $ 1,240 [13],[14],[24]                    
Investment, Identifier [Axis]: Apptio, Inc., First lien - Undrawn                            
Principal amount or par value 827 [13],[14],[23],[24]     827 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[14],[24]                      
Fair Value, Ending Balance 0 [13],[14],[24]     0 [13],[14],[24]                    
Investment, Identifier [Axis]: Apptio, Inc., First lien 1                            
Principal amount or par value $ 5,703 [13],[23],[26]     $ 5,703 [13],[23],[26]                    
Spread 6.00% [13],[26]     6.00% [13],[26]         6.00% [13],[26] 6.00% [13],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     5,703 [13],[26]                      
Fair Value, Ending Balance $ 5,703 [13],[26]     $ 5,703 [13],[26]                    
Investment, Identifier [Axis]: Apptio, Inc., First lien 2                            
Principal amount or par value $ 5,500 [13],[23],[27]     $ 5,500 [13],[23],[27]                    
Spread 6.00% [13],[27]     6.00% [13],[27]         6.00% [13],[27] 6.00% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     5,500 [13],[27]                      
Fair Value, Ending Balance $ 5,500 [13],[27]     $ 5,500 [13],[27]                    
Investment, Identifier [Axis]: Associations, Inc. First Lien - Drawn                            
Principal amount or par value     $ 1,252 [16],[17],[18],[20]                      
Spread     6.50% [16],[17],[20]     6.50% [16],[17],[20] 6.50% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 1,252 [16],[17],[20]                      
Investment, Identifier [Axis]: Associations, Inc. First Lien 1                            
Principal amount or par value     $ 33,701 [16],[18],[21]                      
Spread     4.00% [16],[21]     4.00% [16],[21] 4.00% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 33,701 [16],[21]                      
Investment, Identifier [Axis]: Associations, Inc. First Lien 2                            
Principal amount or par value     $ 9,037 [16],[18],[21]                      
Spread     4.00% [16],[21]     4.00% [16],[21] 4.00% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 9,037 [16],[21]                      
Investment, Identifier [Axis]: Associations, Inc. First Lien 3                            
Principal amount or par value     $ 9,036 [16],[18],[22]                      
Spread     4.00% [16],[22]     4.00% [16],[22] 4.00% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 9,036 [16],[22]                      
Investment, Identifier [Axis]: Associations, Inc. First Lien 4                            
Principal amount or par value     $ 5,457 [16],[18],[22]                      
Spread     4.00% [16],[22]     4.00% [16],[22] 4.00% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 5,457 [16],[22]                      
Investment, Identifier [Axis]: Associations, Inc. First Lien 5                            
Principal amount or par value     $ 4,341 [16],[18],[22]                      
Spread     4.00% [16],[22]     4.00% [16],[22] 4.00% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 4,341 [16],[22]                      
Investment, Identifier [Axis]: Associations, Inc. First Lien 6                            
Principal amount or par value     $ 4,121 [16],[18],[21]                      
Spread     4.00% [16],[21]     4.00% [16],[21] 4.00% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 4,121 [16],[21]                      
Investment, Identifier [Axis]: Associations, Inc., First lien - Undrawn                            
Principal amount or par value 3,543 [13],[14],[23],[24]   2,291 [16],[17],[18],[20] 3,543 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[14],[24]                      
Fair Value, Ending Balance 0 [13],[14],[24]   0 [16],[17],[20] 0 [13],[14],[24]                    
Investment, Identifier [Axis]: Associations, Inc., First lien 1                            
Principal amount or par value $ 35,786 [13],[23],[27]     $ 35,786 [13],[23],[27]                    
Spread 4.00% [13],[27],[28]     4.00% [13],[27],[28]         4.00% [13],[27],[28] 4.00% [13],[27],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     35,786 [13],[27]                      
Fair Value, Ending Balance $ 35,786 [13],[27]     $ 35,786 [13],[27]                    
Investment, Identifier [Axis]: Associations, Inc., First lien 2                            
Principal amount or par value $ 8,810 [13],[23],[26]     $ 8,810 [13],[23],[26]                    
Spread 4.00% [13],[26],[28]     4.00% [13],[26],[28]         4.00% [13],[26],[28] 4.00% [13],[26],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     8,810 [13],[26]                      
Fair Value, Ending Balance $ 8,810 [13],[26]     $ 8,810 [13],[26]                    
Investment, Identifier [Axis]: Associations, Inc., First lien 3                            
Principal amount or par value $ 8,810 [13],[23],[27]     $ 8,810 [13],[23],[27]                    
Spread 4.00% [13],[27],[28]     4.00% [13],[27],[28]         4.00% [13],[27],[28] 4.00% [13],[27],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     8,810 [13],[27]                      
Fair Value, Ending Balance $ 8,810 [13],[27]     $ 8,810 [13],[27]                    
Investment, Identifier [Axis]: Associations, Inc., First lien 4                            
Principal amount or par value $ 5,321 [13],[23],[26]     $ 5,321 [13],[23],[26]                    
Spread 4.00% [13],[26],[28]     4.00% [13],[26],[28]         4.00% [13],[26],[28] 4.00% [13],[26],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     5,321 [13],[26]                      
Fair Value, Ending Balance $ 5,321 [13],[26]     $ 5,321 [13],[26]                    
Investment, Identifier [Axis]: Associations, Inc., First lien 5                            
Principal amount or par value $ 4,233 [13],[23],[26]     $ 4,233 [13],[23],[26]                    
Spread 4.00% [13],[27],[28]     4.00% [13],[27],[28]         4.00% [13],[27],[28] 4.00% [13],[27],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     4,233 [13],[26]                      
Fair Value, Ending Balance $ 4,233 [13],[26]     $ 4,233 [13],[26]                    
Investment, Identifier [Axis]: Aston FinCo S.a r.l. / Aston US Finco, LLC, Second lien                            
Principal amount or par value $ 34,459 [13],[23],[26],[36]   $ 34,459 [16],[18],[22] $ 34,459 [13],[23],[26],[36]                    
Spread 8.25% [13],[26],[36]   8.25% [16],[22] 8.25% [13],[26],[36]   8.25% [16],[22] 8.25% [16],[22]   8.25% [13],[26],[36] 8.25% [13],[26],[36]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     $ 34,356 [13],[26],[36]                      
Fair Value, Ending Balance $ 34,356 [13],[26],[36]   34,458 [16],[22],[37] $ 34,356 [13],[26],[36]                    
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First Lien 1                            
Principal amount or par value     $ 3,454 [16],[18],[21]                      
Spread     7.25% [16],[21]     7.25% [16],[21] 7.25% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 3,454 [16],[21]                      
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First Lien 2                            
Principal amount or par value     $ 1,345 [18],[21]                      
Spread     6.75% [21]     6.75% [21] 6.75% [21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 1,332 [21]                      
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien                            
Principal amount or par value $ 3,454 [23],[27],[36]     $ 3,454 [23],[27],[36]                    
Spread 7.25% [27],[36]     7.25% [27],[36]         7.25% [27],[36] 7.25% [27],[36]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     3,402 [27],[36]                      
Fair Value, Ending Balance $ 3,402 [27],[36]     $ 3,402 [27],[36]                    
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien - Undrawn                            
Principal amount or par value 320 [14],[23],[24],[36]   320 [16],[17],[18],[20],[37] 320 [14],[23],[24],[36]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (5) [14],[24],[36]                      
Fair Value, Ending Balance (5) [14],[24],[36]   0 [16],[17],[20],[37] (5) [14],[24],[36]                    
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.) First Lien 1                            
Principal amount or par value     $ 21,847 [16],[18],[22]                      
Spread     5.75% [16],[22]     5.75% [16],[22] 5.75% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 21,473 [16],[22]                      
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.) First Lien 2                            
Principal amount or par value     $ 14,774 [16],[18],[21]                      
Spread     5.75% [16],[21]     5.75% [16],[21] 5.75% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 14,522 [16],[21]                      
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.), First lien 1                            
Principal amount or par value $ 22,069 [13],[23],[26]     $ 22,069 [13],[23],[26]                    
Spread 5.75% [13],[26]     5.75% [13],[26]         5.75% [13],[26] 5.75% [13],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     21,694 [13],[26]                      
Fair Value, Ending Balance $ 21,694 [13],[26]     $ 21,694 [13],[26]                    
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.), First lien 2                            
Principal amount or par value $ 14,925 [13],[23],[27]     $ 14,925 [13],[23],[27]                    
Spread 5.75% [13],[27]     5.75% [13],[27]         5.75% [13],[27] 5.75% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     14,671 [13],[27]                      
Fair Value, Ending Balance $ 14,671 [13],[27]     $ 14,671 [13],[27]                    
Investment, Identifier [Axis]: Avalara, Inc First Lien                            
Principal amount or par value     $ 17,198 [16],[18],[22]                      
Spread     7.25% [16],[22]     7.25% [16],[22] 7.25% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 17,198 [16],[22]                      
Investment, Identifier [Axis]: Avalara, Inc., First lien - Undrawn                            
Principal amount or par value 3,538 [13],[14],[23],[24]   1,720 [16],[17],[18],[20] 3,538 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (30) [13],[14],[24]                      
Fair Value, Ending Balance (30) [13],[14],[24]   0 [16],[17],[20] (30) [13],[14],[24]                    
Investment, Identifier [Axis]: Avalara, Inc., First lien 1                            
Principal amount or par value $ 22,500 [13],[23],[26]     $ 22,500 [13],[23],[26]                    
Spread 7.25% [13],[26]     7.25% [13],[26]         7.25% [13],[26] 7.25% [13],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     22,307 [13],[26]                      
Fair Value, Ending Balance $ 22,307 [13],[26]     $ 22,307 [13],[26]                    
Investment, Identifier [Axis]: Avalara, Inc., First lien 2                            
Principal amount or par value $ 12,880 [13],[23],[27]     $ 12,880 [13],[23],[27]                    
Spread 7.25% [13],[27]     7.25% [13],[27]         7.25% [13],[27] 7.25% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     12,769 [13],[27]                      
Fair Value, Ending Balance $ 12,769 [13],[27]     $ 12,769 [13],[27]                    
Investment, Identifier [Axis]: Bach Special Limited (Bach Preference Limited), Preferred shares                            
Preferred equity dividend rate       12.25%                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     10,748 [13],[14],[36],[38]                      
Fair Value, Ending Balance 10,748 [13],[14],[36],[38]   11,742 [16],[17] $ 10,748 [13],[14],[36],[38]                    
Investment, Identifier [Axis]: Bluefin Holding, LLC, First lien - Drawn                            
Principal amount or par value $ 1,212 [13],[14],[23],[24]     $ 1,212 [13],[14],[23],[24]                    
Spread 5.75% [13],[14],[24]     5.75% [13],[14],[24]         5.75% [13],[14],[24] 5.75% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     1,177 [13],[14],[24]                      
Fair Value, Ending Balance $ 1,177 [13],[14],[24]     $ 1,177 [13],[14],[24]                    
Investment, Identifier [Axis]: Bluefin Holding, LLC, First lien - Undrawn                            
Principal amount or par value 303 [13],[14],[23],[24]     303 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (9) [13],[14],[24]                      
Fair Value, Ending Balance (9) [13],[14],[24]     (9) [13],[14],[24]                    
Investment, Identifier [Axis]: Bluefin Holding, LLC, Second lien                            
Principal amount or par value $ 18,000 [13],[23],[26]     $ 18,000 [13],[23],[26]                    
Spread 7.75% [13],[26]     7.75% [13],[26]         7.75% [13],[26] 7.75% [13],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     17,338 [13],[26]                      
Fair Value, Ending Balance $ 17,338 [13],[26]     $ 17,338 [13],[26]                    
Investment, Identifier [Axis]: Brave Parent Holdings, Inc. First Lien                            
Principal amount or par value     $ 20,171 [16],[18],[39]                      
Spread     5.00% [16],[39]     5.00% [16],[39] 5.00% [16],[39]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 20,070 [16],[39]                      
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Undrawn 1                            
Principal amount or par value     2,292 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     0 [16],[17],[20]                      
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., Second lien 1                            
Principal amount or par value $ 22,500 [13],[23],[40]     $ 22,500 [13],[23],[40]                    
Spread 7.50% [13],[40]     7.50% [13],[40]         7.50% [13],[40] 7.50% [13],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     21,798 [13],[40]                      
Fair Value, Ending Balance $ 21,798 [13],[40]     $ 21,798 [13],[40]                    
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., Second lien 2                            
Principal amount or par value $ 16,624 [16],[21],[23]     $ 16,624 [16],[21],[23]                    
Spread 7.50% [16],[21]     7.50% [16],[21]         7.50% [16],[21] 7.50% [16],[21]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     16,104 [16],[21]                      
Fair Value, Ending Balance $ 16,104 [16],[21]     $ 16,104 [16],[21]                    
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., Second lien 3                            
Principal amount or par value $ 6,000 [13],[23],[26]     $ 6,000 [13],[23],[26]                    
Spread 7.50% [13],[26]     7.50% [13],[26]         7.50% [13],[26] 7.50% [13],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     5,813 [13],[26]                      
Fair Value, Ending Balance $ 5,813 [13],[26]     $ 5,813 [13],[26]                    
Investment, Identifier [Axis]: Brave Parent Holdings, Inc.n, First lien - Undrawn 2                            
Principal amount or par value     1,146 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     (6) [16],[17],[20]                      
Investment, Identifier [Axis]: Bullhorn, Inc. First Lien 1                            
Principal amount or par value     $ 16,487 [16],[18],[21]                      
Spread     5.50% [16],[21]     5.50% [16],[21] 5.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 16,487 [16],[21]                      
Investment, Identifier [Axis]: Bullhorn, Inc. First Lien 2                            
Principal amount or par value     $ 3,407 [16],[18],[21]                      
Spread     5.50% [16],[21]     5.50% [16],[21] 5.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 3,407 [16],[21]                      
Investment, Identifier [Axis]: Bullhorn, Inc. First Lien 3                            
Principal amount or par value     $ 763 [16],[18],[21]                      
Spread     5.50% [16],[21]     5.50% [16],[21] 5.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 763 [16],[21]                      
Investment, Identifier [Axis]: Bullhorn, Inc. First Lien 4                            
Principal amount or par value     $ 342 [16],[18],[21]                      
Spread     5.50% [16],[21]     5.50% [16],[21] 5.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 342 [16],[21]                      
Investment, Identifier [Axis]: Bullhorn, Inc. First Lien 5                            
Principal amount or par value     $ 273 [16],[18],[21]                      
Spread     5.50% [16],[21]     5.50% [16],[21] 5.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 273 [16],[21]                      
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Drawn                            
Principal amount or par value $ 392 [13],[14],[23],[24]     $ 392 [13],[14],[23],[24]                    
Spread 5.75% [13],[14],[24]     5.75% [13],[14],[24]         5.75% [13],[14],[24] 5.75% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     392 [13],[14],[24]                      
Fair Value, Ending Balance $ 392 [13],[14],[24]     $ 392 [13],[14],[24]                    
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Undrawn                            
Principal amount or par value 460 [13],[14],[23],[24]   852 [16],[17],[18],[20] 460 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[14],[24]                      
Fair Value, Ending Balance 0 [13],[14],[24]   0 [16],[17],[20] 0 [13],[14],[24]                    
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 1                            
Principal amount or par value $ 16,659 [13],[23],[27]     $ 16,659 [13],[23],[27]                    
Spread 5.75% [13],[27]     5.75% [13],[27]         5.75% [13],[27] 5.75% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     16,659 [13],[27]                      
Fair Value, Ending Balance $ 16,659 [13],[27]     $ 16,659 [13],[27]                    
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 2                            
Principal amount or par value $ 3,442 [13],[23],[27]     $ 3,442 [13],[23],[27]                    
Spread 5.75% [13],[27]     5.75% [13],[27]         5.75% [13],[27] 5.75% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     3,442 [13],[27]                      
Fair Value, Ending Balance $ 3,442 [13],[27]     $ 3,442 [13],[27]                    
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 3                            
Principal amount or par value $ 771 [13],[23],[27]     $ 771 [13],[23],[27]                    
Spread 5.75% [13],[27]     5.75% [13],[27]         5.75% [13],[27] 5.75% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     771 [13],[27]                      
Fair Value, Ending Balance $ 771 [13],[27]     $ 771 [13],[27]                    
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 4                            
Principal amount or par value $ 345 [13],[23],[27]     $ 345 [13],[23],[27]                    
Spread 5.75% [13],[27]     5.75% [13],[27]         5.75% [13],[27] 5.75% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     345 [13],[27]                      
Fair Value, Ending Balance $ 345 [13],[27]     $ 345 [13],[27]                    
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 5                            
Principal amount or par value $ 275 [13],[23],[27]     $ 275 [13],[23],[27]                    
Spread 5.75% [13],[27]     5.75% [13],[27]         5.75% [13],[27] 5.75% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     275 [13],[27]                      
Fair Value, Ending Balance $ 275 [13],[27]     $ 275 [13],[27]                    
Investment, Identifier [Axis]: CFS Management, LLC, First Lien 1                            
Principal amount or par value     $ 11,188 [16],[18],[21]                      
Spread     6.25% [16],[21]     6.25% [16],[21] 6.25% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 9,775 [16],[21]                      
Investment, Identifier [Axis]: CFS Management, LLC, First Lien 2                            
Principal amount or par value     $ 3,333 [16],[18],[21]                      
Spread     6.25% [16],[21]     6.25% [16],[21] 6.25% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 2,912 [16],[21]                      
Investment, Identifier [Axis]: CFS Management, LLC, First lien 1                            
Principal amount or par value $ 11,392 [13],[23],[27]     $ 11,392 [13],[23],[27]                    
Spread 6.25% [13],[27],[28]     6.25% [13],[27],[28]         6.25% [13],[27],[28] 6.25% [13],[27],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     10,637 [13],[27]                      
Fair Value, Ending Balance $ 10,637 [13],[27]     $ 10,637 [13],[27]                    
Investment, Identifier [Axis]: CFS Management, LLC, First lien 2                            
Principal amount or par value $ 3,393 [13],[23],[27]     $ 3,393 [13],[23],[27]                    
Spread 6.25% [13],[27],[28]     6.25% [13],[27],[28]         6.25% [13],[27],[28] 6.25% [13],[27],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     3,168 [13],[27]                      
Fair Value, Ending Balance $ 3,168 [13],[27]     $ 3,168 [13],[27]                    
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien                            
Principal amount or par value $ 8,317 [13],[23],[27]     $ 8,317 [13],[23],[27]                    
Spread 5.25% [13],[27],[28]     5.25% [13],[27],[28]         5.25% [13],[27],[28] 5.25% [13],[27],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     7,411 [13],[27]                      
Fair Value, Ending Balance $ 7,411 [13],[27]     $ 7,411 [13],[27]                    
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien - Drawn                            
Principal amount or par value $ 916 [13],[14],[23],[24]     $ 916 [13],[14],[23],[24]                    
Spread 5.25% [13],[14],[24],[28]     5.25% [13],[14],[24],[28]         5.25% [13],[14],[24],[28] 5.25% [13],[14],[24],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     817 [13],[14],[24]                      
Fair Value, Ending Balance $ 817 [13],[14],[24]     $ 817 [13],[14],[24]                    
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien - Undrawn                            
Principal amount or par value 226 [13],[14],[23],[24]   226 [16],[17],[18],[20] 226 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (25) [13],[14],[24]                      
Fair Value, Ending Balance (25) [13],[14],[24]   (10) [16],[17],[20] (25) [13],[14],[24]                    
Investment, Identifier [Axis]: CG Group Holdings, LLC,First Lien                            
Principal amount or par value     $ 8,403 [16],[18],[21]                      
Spread     6.75% [16],[21],[31]     6.75% [16],[21],[31] 6.75% [16],[21],[31]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 8,039 [16],[21]                      
Investment, Identifier [Axis]: CG Group Holdings, LLC,First Lien - Drawn                            
Principal amount or par value     $ 935 [16],[17],[18],[20]                      
Spread     6.75% [16],[17],[20],[31]     6.75% [16],[17],[20],[31] 6.75% [16],[17],[20],[31]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 894 [16],[17],[20]                      
Investment, Identifier [Axis]: CHA Holdings, Inc. Second Lien 1                            
Principal amount or par value     $ 7,012 [16],[18],[19]                      
Spread     8.75% [16],[19]     8.75% [16],[19] 8.75% [16],[19]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 7,012 [16],[19]                      
Investment, Identifier [Axis]: CHA Holdings, Inc. Second Lien 2                            
Principal amount or par value     $ 4,453 [16],[17],[18]                      
Spread     8.75% [16],[17]     8.75% [16],[17] 8.75% [16],[17]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 4,454 [16],[17]                      
Investment, Identifier [Axis]: CHA Holdings, Inc., Second lien 1                            
Principal amount or par value $ 7,012 [13],[23],[25]     $ 7,012 [13],[23],[25]                    
Spread 8.75% [13],[25]     8.75% [13],[25]         8.75% [13],[25] 8.75% [13],[25]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     6,923 [13],[25]                      
Fair Value, Ending Balance $ 6,923 [13],[25]     $ 6,923 [13],[25]                    
Investment, Identifier [Axis]: CHA Holdings, Inc., Second lien 2                            
Principal amount or par value $ 4,453 [13],[14],[23]     $ 4,453 [13],[14],[23]                    
Spread 8.75% [13],[14]     8.75% [13],[14]         8.75% [13],[14] 8.75% [13],[14]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     4,396 [13],[14]                      
Fair Value, Ending Balance $ 4,396 [13],[14]     $ 4,396 [13],[14]                    
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc. Second Lien 1                            
Principal amount or par value     $ 18,266 [16],[17],[18]                      
Spread     7.25% [16],[17]     7.25% [16],[17] 7.25% [16],[17]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 18,184 [16],[17]                      
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc. Second Lien 2                            
Principal amount or par value     $ 7,500 [16],[18],[22]                      
Spread     7.25% [16],[22]     7.25% [16],[22] 7.25% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 7,467 [16],[22]                      
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., Second lien 1                            
Principal amount or par value $ 18,266 [13],[14],[23]     $ 18,266 [13],[14],[23]                    
Spread 7.25% [13],[14]     7.25% [13],[14]         7.25% [13],[14] 7.25% [13],[14]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     17,409 [13],[14]                      
Fair Value, Ending Balance $ 17,409 [13],[14]     $ 17,409 [13],[14]                    
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., Second lien 2                            
Principal amount or par value $ 7,500 [13],[23],[26]     $ 7,500 [13],[23],[26]                    
Spread 7.25% [13],[26]     7.25% [13],[26]         7.25% [13],[26] 7.25% [13],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     7,148 [13],[26]                      
Fair Value, Ending Balance $ 7,148 [13],[26]     $ 7,148 [13],[26]                    
Investment, Identifier [Axis]: Calabrio, Inc. First Lien                            
Principal amount or par value     $ 12,347 [18],[39]                      
Spread     7.13% [39]     7.13% [39] 7.13% [39]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 12,224 [39]                      
Investment, Identifier [Axis]: Calabrio, Inc. First Lien - Drawn                            
Principal amount or par value     $ 850 [17],[18],[20]                      
Spread     7.13% [17],[20]     7.13% [17],[20] 7.13% [17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 841 [17],[20]                      
Investment, Identifier [Axis]: Calabrio, Inc., First lien                            
Principal amount or par value $ 12,347 [13],[23],[40]     $ 12,347 [13],[23],[40]                    
Spread 7.00% [13],[40]     7.00% [13],[40]         7.00% [13],[40] 7.00% [13],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     12,347 [13],[40]                      
Fair Value, Ending Balance $ 12,347 [13],[40]     $ 12,347 [13],[40]                    
Investment, Identifier [Axis]: Calabrio, Inc., First lien - Drawn                            
Principal amount or par value $ 850 [13],[14],[23],[24]     $ 850 [13],[14],[23],[24]                    
Spread 7.00% [13],[14],[24]     7.00% [13],[14],[24]         7.00% [13],[14],[24] 7.00% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     850 [13],[14],[24]                      
Fair Value, Ending Balance $ 850 [13],[14],[24]     $ 850 [13],[14],[24]                    
Investment, Identifier [Axis]: Calabrio, Inc., First lien - Undrawn                            
Principal amount or par value 637 [13],[14],[23],[24]   637 [17],[18],[20] 637 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[14],[24]                      
Fair Value, Ending Balance 0 [13],[14],[24]   (6) [17],[20] 0 [13],[14],[24]                    
Investment, Identifier [Axis]: Cardinal Parent, Inc. First Lien                            
Principal amount or par value     $ 11,852 [18],[19]                      
Spread     4.50% [19]     4.50% [19] 4.50% [19]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 10,919 [19]                      
Investment, Identifier [Axis]: Cardinal Parent, Inc. Second Lien                            
Principal amount or par value     $ 9,767 [16],[18],[19]                      
Spread     7.75% [16],[19]     7.75% [16],[19] 7.75% [16],[19]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 8,975 [16],[19]                      
Investment, Identifier [Axis]: Cardinal Parent, Inc., First lien                            
Principal amount or par value $ 11,974 [13],[23],[25]     $ 11,974 [13],[23],[25]                    
Spread 4.50% [13],[25]     4.50% [13],[25]         4.50% [13],[25] 4.50% [13],[25]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     11,490 [13],[25]                      
Fair Value, Ending Balance $ 11,490 [13],[25]     $ 11,490 [13],[25]                    
Investment, Identifier [Axis]: Cardinal Parent, Inc., Second lien                            
Principal amount or par value $ 9,767 [13],[23],[25]     $ 9,767 [13],[23],[25]                    
Spread 7.75% [13],[25]     7.75% [13],[25]         7.75% [13],[25] 7.75% [13],[25]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     9,432 [13],[25]                      
Fair Value, Ending Balance $ 9,432 [13],[25]     $ 9,432 [13],[25]                    
Investment, Identifier [Axis]: Castle Management Borrower LLC, First lien                            
Principal amount or par value $ 14,288 [13],[23],[26]     $ 14,288 [13],[23],[26]                    
Spread 2.19% [13],[26]     2.19% [13],[26]         2.19% [13],[26] 2.19% [13],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     13,605 [13],[26]                      
Fair Value, Ending Balance $ 13,605 [13],[26]     $ 13,605 [13],[26]                    
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, Second Lien 1                            
Principal amount or par value     $ 47,838 [16],[17],[18]                      
Spread     7.50% [16],[17]     7.50% [16],[17] 7.50% [16],[17]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 45,072 [16],[17]                      
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, Second Lien 2                            
Principal amount or par value     $ 7,500 [16],[18],[22]                      
Spread     7.50% [16],[22]     7.50% [16],[22] 7.50% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 7,066 [16],[22]                      
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, Second lien 1                            
Principal amount or par value $ 47,838 [14],[23]     $ 47,838 [14],[23]                    
Spread 7.50% [14]     7.50% [14]         7.50% [14] 7.50% [14]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     40,941 [14]                      
Fair Value, Ending Balance $ 40,941 [14]     $ 40,941 [14]                    
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, Second lien 2                            
Principal amount or par value $ 7,500 [23],[26]     $ 7,500 [23],[26]                    
Spread 7.50% [26]     7.50% [26]         7.50% [26] 7.50% [26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     6,419 [26]                      
Fair Value, Ending Balance $ 6,419 [26]     $ 6,419 [26]                    
Investment, Identifier [Axis]: CommerceHub, Inc. First Lien                            
Principal amount or par value     $ 3,960 [16],[17],[18]                      
Spread     6.25% [16],[17]     6.25% [16],[17] 6.25% [16],[17]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 3,960 [16],[17]                      
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First Lien                            
Principal amount or par value     $ 7,091 [16],[18],[21]                      
Spread     5.50% [16],[21]     5.50% [16],[21] 5.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 6,899 [16],[21]                      
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien                            
Principal amount or par value $ 7,163 [13],[23],[27]     $ 7,163 [13],[23],[27]                    
Spread 5.75% [13],[27]     5.75% [13],[27]         5.75% [13],[27] 5.75% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     6,928 [13],[27]                      
Fair Value, Ending Balance $ 6,928 [13],[27]     $ 6,928 [13],[27]                    
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien - Undrawn 1                            
Principal amount or par value 425 [13],[14],[23],[24]   425 [16],[17],[18],[20] 425 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (14) [13],[14],[24]                      
Fair Value, Ending Balance (14) [13],[14],[24]   (11) [16],[17],[20] (14) [13],[14],[24]                    
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien - Undrawn 2                            
Principal amount or par value 849 [13],[14],[23],[24]   849 [16],[17],[18],[20] 849 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (28) [13],[14],[24]                      
Fair Value, Ending Balance (28) [13],[14],[24]   (23) [16],[17],[20] (28) [13],[14],[24]                    
Investment, Identifier [Axis]: Convey Health Solutions, Inc. First Lien 1                            
Principal amount or par value     $ 19,022 [16],[18],[19]                      
Spread     5.25% [16],[19]     5.25% [16],[19] 5.25% [16],[19]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 16,768 [16],[19]                      
Investment, Identifier [Axis]: Convey Health Solutions, Inc. First Lien 2                            
Principal amount or par value     $ 3,176 [16],[18],[19]                      
Spread     5.25% [16],[19]     5.25% [16],[19] 5.25% [16],[19]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 2,800 [16],[19]                      
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien 1                            
Principal amount or par value $ 19,215 [13],[23],[25]     $ 19,215 [13],[23],[25]                    
Spread 5.25% [13],[25]     5.25% [13],[25]         5.25% [13],[25] 5.25% [13],[25]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     18,639 [13],[25]                      
Fair Value, Ending Balance $ 18,639 [13],[25]     $ 18,639 [13],[25]                    
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien 2                            
Principal amount or par value $ 3,208 [13],[23],[25]     $ 3,208 [13],[23],[25]                    
Spread 5.25% [13],[25]     5.25% [13],[25]         5.25% [13],[25] 5.25% [13],[25]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     3,112 [13],[25]                      
Fair Value, Ending Balance $ 3,112 [13],[25]     $ 3,112 [13],[25]                    
Investment, Identifier [Axis]: Coupa Holdings, LLC First Lien 1                            
Principal amount or par value     $ 7,230 [16],[18],[21]                      
Spread     7.50% [16],[21]     7.50% [16],[21] 7.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 7,303 [16],[21]                      
Investment, Identifier [Axis]: Coupa Holdings, LLC First Lien 2                            
Principal amount or par value     $ 7,230 [16],[18],[22]                      
Spread     7.50% [16],[22]     7.50% [16],[22] 7.50% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 7,303 [16],[22]                      
Investment, Identifier [Axis]: Coupa Holdings, LLC First lien - Undrawn 1                            
Principal amount or par value     1,291 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     13 [16],[17],[20]                      
Investment, Identifier [Axis]: Coupa Holdings, LLC First lien - Undrawn 2                            
Principal amount or par value     989 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     0 [16],[17],[20]                      
Investment, Identifier [Axis]: Coyote Buyer, LLC First Lien 1                            
Principal amount or par value     $ 13,653 [18],[39]                      
Spread     6.00% [39]     6.00% [39] 6.00% [39]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 13,653 [39]                      
Investment, Identifier [Axis]: Coyote Buyer, LLC First Lien 2                            
Principal amount or par value     $ 2,457 [18],[39]                      
Spread     8.00% [39]     8.00% [39] 8.00% [39]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 2,457 [39]                      
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien - Undrawn                            
Principal amount or par value 1,013 [13],[14],[23],[24]   1,013 [17],[18],[20] 1,013 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[14],[24]                      
Fair Value, Ending Balance 0 [13],[14],[24]   0 [17],[20] 0 [13],[14],[24]                    
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien 1                            
Principal amount or par value $ 13,795 [13],[23],[40]     $ 13,795 [13],[23],[40]                    
Spread 6.00% [13],[40]     6.00% [13],[40]         6.00% [13],[40] 6.00% [13],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     13,795 [13],[40]                      
Fair Value, Ending Balance $ 13,795 [13],[40]     $ 13,795 [13],[40]                    
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien 2                            
Principal amount or par value $ 2,482 [13],[23],[40]     $ 2,482 [13],[23],[40]                    
Spread 8.00% [13],[40]     8.00% [13],[40]         8.00% [13],[40] 8.00% [13],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     2,482 [13],[40]                      
Fair Value, Ending Balance $ 2,482 [13],[40]     $ 2,482 [13],[40]                    
Investment, Identifier [Axis]: Cube Industrials Buyer, Inc. First Lien                            
Principal amount or par value     $ 4,483 [16],[17],[18]                      
Spread     6.00% [16],[17]     6.00% [16],[17] 6.00% [16],[17]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 4,450 [16],[17]                      
Investment, Identifier [Axis]: Cube Industrials Buyer, Inc., First lien - Undrawn                            
Principal amount or par value     517 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     (4) [16],[17],[20]                      
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First Lien                            
Principal amount or par value     $ 1,823 [16],[18],[21]                      
Spread     6.41% [16],[21]     6.41% [16],[21] 6.41% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 1,768 [16],[21]                      
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First Lien - Drawn                            
Principal amount or par value     $ 1,021 [16],[17],[18],[20]                      
Spread     6.50% [16],[17],[20]     6.50% [16],[17],[20] 6.50% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 992 [16],[17],[20]                      
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien - Drawn                            
Principal amount or par value $ 2,836 [13],[14],[23],[24]     $ 2,836 [13],[14],[23],[24]                    
Spread 6.41% [13],[14],[24]     6.41% [13],[14],[24]         6.41% [13],[14],[24] 6.41% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     2,781 [13],[14],[24]                      
Fair Value, Ending Balance $ 2,781 [13],[14],[24]     $ 2,781 [13],[14],[24]                    
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien - Undrawn 1                            
Principal amount or par value 450 [13],[14],[23],[24]     450 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (9) [13],[14],[24]                      
Fair Value, Ending Balance (9) [13],[14],[24]     (9) [13],[14],[24]                    
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien - Undrawn 2                            
Principal amount or par value 3,936 [14],[23],[24]     3,936 [14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (59) [14],[24]                      
Fair Value, Ending Balance (59) [14],[24]     (59) [14],[24]                    
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 1                            
Principal amount or par value $ 19,660 [13],[23],[27]     $ 19,660 [13],[23],[27]                    
Spread 6.41% [13],[27]     6.41% [13],[27]         6.41% [13],[27] 6.41% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     19,278 [13],[27]                      
Fair Value, Ending Balance $ 19,278 [13],[27]     $ 19,278 [13],[27]                    
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 2                            
Principal amount or par value $ 7,046 [13],[23],[27]     $ 7,046 [13],[23],[27]                    
Spread 6.41% [13],[27]     6.41% [13],[27]         6.41% [13],[27] 6.41% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     6,909 [13],[27]                      
Fair Value, Ending Balance $ 6,909 [13],[27]     $ 6,909 [13],[27]                    
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 3                            
Principal amount or par value $ 3,273 [13],[14],[23]     $ 3,273 [13],[14],[23]                    
Spread 6.41% [13],[14]     6.41% [13],[14]         6.41% [13],[14] 6.41% [13],[14]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     3,209 [13],[14]                      
Fair Value, Ending Balance $ 3,209 [13],[14]     $ 3,209 [13],[14]                    
Investment, Identifier [Axis]: DG Investment Intermediate Holdings 2, Inc. Second Lien                            
Principal amount or par value     $ 20,313 [17],[18]                      
Spread     6.75% [17]     6.75% [17] 6.75% [17]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 18,333 [17]                      
Investment, Identifier [Axis]: DG Investment Intermediate Holdings 2, Inc., Second lien                            
Principal amount or par value $ 20,313 [14],[23]     $ 20,313 [14],[23]                    
Spread 6.75% [14]     6.75% [14]         6.75% [14] 6.75% [14]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     18,053 [14]                      
Fair Value, Ending Balance $ 18,053 [14]     $ 18,053 [14]                    
Investment, Identifier [Axis]: DOCS, MSO, LLC, First Lien 1                            
Principal amount or par value     $ 18,572 [16],[18],[22]                      
Spread     5.75% [16],[22]     5.75% [16],[22] 5.75% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 18,238 [16],[22]                      
Investment, Identifier [Axis]: DOCS, MSO, LLC, First Lien 2                            
Principal amount or par value     $ 6,955 [16],[18],[19]                      
Spread     5.75% [16],[19]     5.75% [16],[19] 5.75% [16],[19]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 6,830 [16],[19]                      
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn                            
Principal amount or par value 2,457 [13],[14],[23],[24]   2,405 [16],[17],[18],[20] 2,457 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (67) [13],[14],[24]                      
Fair Value, Ending Balance (67) [13],[14],[24]   (43) [16],[17],[20] (67) [13],[14],[24]                    
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn 1                            
Principal amount or par value 2,405 [13],[14],[23],[24]     2,405 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (66) [13],[14],[24]                      
Fair Value, Ending Balance (66) [13],[14],[24]     (66) [13],[14],[24]                    
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn 2                            
Principal amount or par value 6,561 [13],[14],[23],[24]     6,561 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (180) [13],[14],[24]                      
Fair Value, Ending Balance (180) [13],[14],[24]     (180) [13],[14],[24]                    
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien 1                            
Principal amount or par value $ 18,760 [13],[23],[26]     $ 18,760 [13],[23],[26]                    
Spread 5.75% [13],[26]     5.75% [13],[26]         5.75% [13],[26] 5.75% [13],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     18,246 [13],[26]                      
Fair Value, Ending Balance $ 18,246 [13],[26]     $ 18,246 [13],[26]                    
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien 2                            
Principal amount or par value $ 7,025 [13],[23],[25]     $ 7,025 [13],[23],[25]                    
Spread 5.75% [13],[25]     5.75% [13],[25]         5.75% [13],[25] 5.75% [13],[25]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     6,833 [13],[25]                      
Fair Value, Ending Balance $ 6,833 [13],[25]     $ 6,833 [13],[25]                    
Investment, Identifier [Axis]: DS Admiral Bidco, LLC, First Lien                            
Principal amount or par value     $ 7,472 [16],[18],[21]                      
Spread     7.00% [16],[21]     7.00% [16],[21] 7.00% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 7,564 [16],[21]                      
Investment, Identifier [Axis]: DS Admiral Bidco, LLC, First lien                            
Principal amount or par value $ 7,547 [23]     $ 7,547 [23]                    
Spread 7.00%     7.00%         7.00% 7.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     7,434                      
Fair Value, Ending Balance $ 7,434     $ 7,434                    
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First Lien - Drawn 1                            
Principal amount or par value     $ 66 [16],[17],[18],[20]                      
Spread     5.50% [16],[17],[20]     5.50% [16],[17],[20] 5.50% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 66 [16],[17],[20]                      
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First Lien - Drawn 2                            
Principal amount or par value     $ 66 [16],[17],[18],[20]                      
Spread     4.50% [16],[17],[20]     4.50% [16],[17],[20] 4.50% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 66 [16],[17],[20]                      
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First Lien 1                            
Principal amount or par value     $ 13,011 [16],[18],[22]                      
Spread     5.50% [16],[22]     5.50% [16],[22] 5.50% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 13,011 [16],[22]                      
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First Lien 2                            
Principal amount or par value     $ 1,096 [16],[18],[21]                      
Spread     5.50% [16],[21]     5.50% [16],[21] 5.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 1,096 [16],[21]                      
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Drawn                            
Principal amount or par value $ 33 [13],[14],[23],[24]     $ 33 [13],[14],[23],[24]                    
Spread 4.50% [13],[14],[24]     4.50% [13],[14],[24]         4.50% [13],[14],[24] 4.50% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     32 [13],[14],[24]                      
Fair Value, Ending Balance $ 32 [13],[14],[24]     $ 32 [13],[14],[24]                    
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Undrawn 1                            
Principal amount or par value 524 [13],[14],[23],[24]   459 [16],[17],[18],[20] 524 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (15) [13],[14],[24]                      
Fair Value, Ending Balance (15) [13],[14],[24]   0 [16],[17],[20] (15) [13],[14],[24]                    
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Undrawn 2                            
Principal amount or par value 953 [13],[14],[23],[24]   920 [16],[17],[18],[20] 953 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (27) [13],[14],[24]                      
Fair Value, Ending Balance (27) [13],[14],[24]   0 [16],[17],[20] (27) [13],[14],[24]                    
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 1                            
Principal amount or par value $ 13,144 [13],[23],[26]     $ 13,144 [13],[23],[26]                    
Spread 5.50% [13],[26]     5.50% [13],[26]         5.50% [13],[26] 5.50% [13],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     12,776 [13],[26]                      
Fair Value, Ending Balance $ 12,776 [13],[26]     $ 12,776 [13],[26]                    
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 2                            
Principal amount or par value $ 1,107 [23]     $ 1,107 [23]                    
Spread 5.50%     5.50%         5.50% 5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     1,076                      
Fair Value, Ending Balance $ 1,076     $ 1,076                    
Investment, Identifier [Axis]: Dealer Tire Holdings, LLC, Preferred shares                            
Preferred equity dividend rate       7.00%                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     65,688 [13],[14]                      
Fair Value, Ending Balance 65,688 [13],[14]   74,768 [16],[17] $ 65,688 [13],[14]                    
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First Lien - Drawn                            
Principal amount or par value     $ 2,623 [16],[17],[18],[20]                      
Spread     5.75% [16],[17],[20]     5.75% [16],[17],[20] 5.75% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 2,576 [16],[17],[20]                      
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First Lien 1                            
Principal amount or par value     $ 37,477 [16],[18],[21]                      
Spread     5.75% [16],[21]     5.75% [16],[21] 5.75% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 36,791 [16],[21]                      
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First Lien 2                            
Principal amount or par value     $ 3,945 [16],[17],[18]                      
Spread     5.75% [16],[17]     5.75% [16],[17] 5.75% [16],[17]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 3,873 [16],[17]                      
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien                            
Principal amount or par value $ 37,860 [13],[23],[27]     $ 37,860 [13],[23],[27]                    
Spread 5.75% [13],[27]     5.75% [13],[27]         5.75% [13],[27] 5.75% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     36,232 [13],[27]                      
Fair Value, Ending Balance $ 36,232 [13],[27]     $ 36,232 [13],[27]                    
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Drawn 1                            
Principal amount or par value $ 3,985 [13],[14],[23],[24]     $ 3,985 [13],[14],[23],[24]                    
Spread 5.75% [13],[14],[24]     5.75% [13],[14],[24]         5.75% [13],[14],[24] 5.75% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     3,814 [13],[14],[24]                      
Fair Value, Ending Balance $ 3,814 [13],[14],[24]     $ 3,814 [13],[14],[24]                    
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Drawn 2                            
Principal amount or par value $ 2,623 [13],[14],[23],[24]     $ 2,623 [13],[14],[23],[24]                    
Spread 5.75% [13],[14],[24]     5.75% [13],[14],[24]         5.75% [13],[14],[24] 5.75% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     2,510 [13],[14],[24]                      
Fair Value, Ending Balance $ 2,510 [13],[14],[24]     $ 2,510 [13],[14],[24]                    
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Undrawn                            
Principal amount or par value     404 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     (7) [16],[17],[20]                      
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Undrawn 1                            
Principal amount or par value 404 [13],[14],[23],[24]     404 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (17) [13],[14],[24]                      
Fair Value, Ending Balance (17) [13],[14],[24]     (17) [13],[14],[24]                    
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Undrawn 2                            
Principal amount or par value 9,080 [13],[14],[23],[24]     9,080 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     $ (390) [13],[14],[24]                      
Fair Value, Ending Balance $ (390) [13],[14],[24]     $ (390) [13],[14],[24]                    
Investment, Identifier [Axis]: Diamond Parent Holdings Corp, Wholly-owned subsidiaries                            
Number of investments held | investment 2   2 2   2 2   2 2        
Investment, Identifier [Axis]: Diligent Corporation , First lien - Undrawn                            
Principal amount or par value     $ 1,667 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     (33) [16],[17],[20]                      
Investment, Identifier [Axis]: Diligent Corporation, First Lien - Drawn                            
Principal amount or par value     $ 1,957 [16],[17],[18],[20]                      
Spread     6.25% [16],[17],[20]     6.25% [16],[17],[20] 6.25% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 1,919 [16],[17],[20]                      
Investment, Identifier [Axis]: Diligent Corporation, First Lien 1                            
Principal amount or par value     $ 17,404 [16],[18],[21]                      
Spread     5.75% [16],[21]     5.75% [16],[21] 5.75% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 16,998 [16],[21]                      
Investment, Identifier [Axis]: Diligent Corporation, First Lien 2                            
Principal amount or par value     $ 5,768 [16],[17],[18]                      
Spread     6.25% [16],[17]     6.25% [16],[17] 6.25% [16],[17]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 5,654 [16],[17]                      
Investment, Identifier [Axis]: Diligent Corporation, First Lien 3                            
Principal amount or par value     $ 5,679 [16],[18],[21]                      
Spread     5.75% [16],[21]     5.75% [16],[21] 5.75% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 5,546 [16],[21]                      
Investment, Identifier [Axis]: Diligent Corporation, First lien                            
Number of investments held | investment     3     3 3              
Investment, Identifier [Axis]: Diligent Corporation, First lien - Drawn                            
Principal amount or par value $ 1,087 [13],[14],[23],[24]     $ 1,087 [13],[14],[23],[24]                    
Spread 6.25% [13],[14],[24]     6.25% [13],[14],[24]         6.25% [13],[14],[24] 6.25% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     $ 1,087 [13],[14],[24]                      
Fair Value, Ending Balance $ 1,087 [13],[14],[24]     $ 1,087 [13],[14],[24]                    
Investment, Identifier [Axis]: Diligent Corporation, First lien - Undrawn                            
Principal amount or par value 2,537 [13],[14],[23],[24],[41]     2,537 [13],[14],[23],[24],[41]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[14],[24],[41]                      
Fair Value, Ending Balance 0 [13],[14],[24],[41]     0 [13],[14],[24],[41]                    
Investment, Identifier [Axis]: Diligent Corporation, First lien 1                            
Principal amount or par value $ 17,583 [13],[23],[27]     $ 17,583 [13],[23],[27]                    
Spread 5.75% [13],[27]     5.75% [13],[27]         5.75% [13],[27] 5.75% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     17,371 [13],[27]                      
Fair Value, Ending Balance $ 17,371 [13],[27]     $ 17,371 [13],[27]                    
Investment, Identifier [Axis]: Diligent Corporation, First lien 2                            
Principal amount or par value $ 9,805 [13],[23],[27]     $ 9,805 [13],[23],[27]                    
Spread 5.75% [13],[27]     5.75% [13],[27]         5.75% [13],[27] 5.75% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     9,688 [13],[27]                      
Fair Value, Ending Balance $ 9,688 [13],[27]     $ 9,688 [13],[27]                    
Investment, Identifier [Axis]: Diligent Corporation, First lien 3                            
Principal amount or par value $ 5,827 [13],[14],[23]     $ 5,827 [13],[14],[23]                    
Spread 6.25% [13],[14]     6.25% [13],[14]         6.25% [13],[14] 6.25% [13],[14]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     $ 5,827 [13],[14]                      
Fair Value, Ending Balance $ 5,827 [13],[14]     $ 5,827 [13],[14]                    
Investment, Identifier [Axis]: Diligent Preferred Issuer, Inc., Preferred shares                            
Preferred equity dividend rate     10.50% 10.50%                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     $ 11,304 [13],[14],[41]                      
Fair Value, Ending Balance 11,304 [13],[14],[41]   12,162 [16],[17] $ 11,304 [13],[14],[41]                    
Investment, Identifier [Axis]: EAB Global, Inc. Second Lien                            
Principal amount or par value     $ 14,868 [16],[18],[21]                      
Spread     6.50% [16],[21]     6.50% [16],[21] 6.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 14,868 [16],[21]                      
Investment, Identifier [Axis]: EAB Global, Inc., Second lien                            
Principal amount or par value $ 33,452 [13],[23],[27]     $ 33,452 [13],[23],[27]                    
Spread 6.50% [13],[27]     6.50% [13],[27]         6.50% [13],[27] 6.50% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     32,392 [13],[27]                      
Fair Value, Ending Balance $ 32,392 [13],[27]     $ 32,392 [13],[27]                    
Investment, Identifier [Axis]: Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.), First lien 1                            
Principal amount or par value     10,676 [16],[18],[21]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     10,676 [16],[21]                      
Investment, Identifier [Axis]: Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.), First lien 2                            
Principal amount or par value     342 [18]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     342                      
Investment, Identifier [Axis]: Eagle Infrastructure Super HoldCo, LLC, Ordinary shares                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     6,855 [16],[17]                      
Investment, Identifier [Axis]: Edmentum Ultimate Holdings, LLC, Subordinated                            
Principal amount or par value $ 16,473 [13],[14],[23]   $ 18,635 [16],[17],[18] $ 16,473 [13],[14],[23]                    
Spread 6.50% [13],[14],[28]   7.50% [16],[17] 6.50% [13],[14],[28]   7.50% [16],[17] 7.50% [16],[17]   6.50% [13],[14],[28] 6.50% [13],[14],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     $ 16,473 [13],[14]                      
Fair Value, Ending Balance $ 16,473 [13],[14]   18,635 [16],[17] $ 16,473 [13],[14]                    
Investment, Identifier [Axis]: Education Management Corporation, Ordinary shares 1                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [27]                      
Fair Value, Ending Balance 0 [27]     0 [27]                    
Investment, Identifier [Axis]: Education Management Corporation, Ordinary shares 2                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [27]                      
Fair Value, Ending Balance 0 [27]     0 [27]                    
Investment, Identifier [Axis]: Education Management Corporation, Preferred shares 1                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [27]                      
Fair Value, Ending Balance 0 [27]     0 [27]                    
Investment, Identifier [Axis]: Education Management Corporation, Preferred shares 2                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [27]                      
Fair Value, Ending Balance 0 [27]     0 [27]                    
Investment, Identifier [Axis]: Education Management II LLC, First lien 1                            
Principal amount or par value $ 300 [23],[27]     $ 300 [23],[27]                    
Spread 7.50% [27]     7.50% [27]         7.50% [27] 7.50% [27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [27]                      
Fair Value, Ending Balance $ 0 [27]     $ 0 [27]                    
Investment, Identifier [Axis]: Education Management II LLC, First lien 2                            
Principal amount or par value $ 169 [14],[23]     $ 169 [14],[23]                    
Spread 7.50% [14]     7.50% [14]         7.50% [14] 7.50% [14]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [14]                      
Fair Value, Ending Balance $ 0 [14]     $ 0 [14]                    
Investment, Identifier [Axis]: Education Management II LLC, First lien 3                            
Principal amount or par value $ 205 [23],[27]     $ 205 [23],[27]                    
Spread 6.50% [27]     6.50% [27]         6.50% [27] 6.50% [27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [27]                      
Fair Value, Ending Balance $ 0 [27]     $ 0 [27]                    
Investment, Identifier [Axis]: Education Management II LLC, First lien 4                            
Principal amount or par value $ 115 [14],[23]     $ 115 [14],[23]                    
Spread 6.50% [14]     6.50% [14]         6.50% [14] 6.50% [14]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [14]                      
Fair Value, Ending Balance $ 0 [14]     $ 0 [14]                    
Investment, Identifier [Axis]: Education Management II LLC, First lien 5                            
Principal amount or par value $ 139 [23],[27]     $ 139 [23],[27]                    
Spread 8.50% [27]     8.50% [27]         8.50% [27] 8.50% [27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [27]                      
Fair Value, Ending Balance $ 0 [27]     $ 0 [27]                    
Investment, Identifier [Axis]: Education Management II LLC, First lien 6                            
Principal amount or par value $ 79 [14],[23]     $ 79 [14],[23]                    
Spread 8.50% [14]     8.50% [14]         8.50% [14] 8.50% [14]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [14]                      
Fair Value, Ending Balance $ 0 [14]     $ 0 [14]                    
Investment, Identifier [Axis]: Education Management II LLC, First lien 7                            
Principal amount or par value $ 4 [23],[27]     $ 4 [23],[27]                    
Spread 8.50% [27]     8.50% [27]         8.50% [27] 8.50% [27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [27]                      
Fair Value, Ending Balance $ 0 [27]     $ 0 [27]                    
Investment, Identifier [Axis]: Education Management II LLC, First lien 8                            
Principal amount or par value $ 2 [14],[23]     $ 2 [14],[23]                    
Spread 8.50% [14]     8.50% [14]         8.50% [14] 8.50% [14]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [14]                      
Fair Value, Ending Balance $ 0 [14]     $ 0 [14]                    
Investment, Identifier [Axis]: FR Arsenal Holdings II Corp., First lien                            
Principal amount or par value $ 14,582 [13],[23],[27]     $ 14,582 [13],[23],[27]                    
Spread 7.50% [13],[27],[28]     7.50% [13],[27],[28]         7.50% [13],[27],[28] 7.50% [13],[27],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     13,123 [13],[27]                      
Fair Value, Ending Balance $ 13,123 [13],[27]     $ 13,123 [13],[27]                    
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First Lien - Drawn 1                            
Principal amount or par value     $ 4,503 [16],[17],[18],[20]                      
Spread     6.00% [16],[17],[20]     6.00% [16],[17],[20] 6.00% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 4,466 [16],[17],[20]                      
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First Lien - Drawn 2                            
Principal amount or par value     $ 315 [16],[17],[18],[20]                      
Spread     5.75% [16],[17],[20]     5.75% [16],[17],[20] 5.75% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 310 [16],[17],[20]                      
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First Lien 1                            
Principal amount or par value     $ 10,290 [16],[18],[39]                      
Spread     5.75% [16],[39]     5.75% [16],[39] 5.75% [16],[39]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 10,125 [16],[39]                      
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First Lien 2                            
Principal amount or par value     $ 3,454 [16],[18],[39]                      
Spread     5.75% [16],[39]     5.75% [16],[39] 5.75% [16],[39]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 3,398 [16],[39]                      
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First Lien 3                            
Principal amount or par value     $ 3,432 [16],[18],[39]                      
Spread     5.75% [16],[39]     5.75% [16],[39] 5.75% [16],[39]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 3,378 [16],[39]                      
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Drawn 1                            
Principal amount or par value $ 490 [13],[14],[23],[24]     $ 490 [13],[14],[23],[24]                    
Spread 5.75% [13],[14],[24]     5.75% [13],[14],[24]         5.75% [13],[14],[24] 5.75% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     477 [13],[14],[24]                      
Fair Value, Ending Balance $ 477 [13],[14],[24]     $ 477 [13],[14],[24]                    
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Drawn 2                            
Principal amount or par value $ 589 [13],[14],[23],[24]     $ 589 [13],[14],[23],[24]                    
Spread 6.00% [13],[14],[24]     6.00% [13],[14],[24]         6.00% [13],[14],[24] 6.00% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     584 [13],[14],[24]                      
Fair Value, Ending Balance $ 584 [13],[14],[24]     $ 584 [13],[14],[24]                    
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 1                            
Principal amount or par value 910 [13],[14],[23],[24]   1,229 [16],[17],[18],[20] 910 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (25) [13],[14],[24]                      
Fair Value, Ending Balance (25) [13],[14],[24]   (10) [16],[17],[20] (25) [13],[14],[24]                    
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 2                            
Principal amount or par value 5,165 [13],[14],[23],[24]   1,085 [16],[17],[18],[20] 5,165 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (52) [13],[14],[24]                      
Fair Value, Ending Balance (52) [13],[14],[24]   (17) [16],[17],[20] (52) [13],[14],[24]                    
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 1                            
Principal amount or par value $ 10,395 [13],[23],[40]     $ 10,395 [13],[23],[40]                    
Spread 5.75% [13],[40]     5.75% [13],[40]         5.75% [13],[40] 5.75% [13],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     10,110 [13],[40]                      
Fair Value, Ending Balance $ 10,110 [13],[40]     $ 10,110 [13],[40]                    
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 2                            
Principal amount or par value $ 3,489 [13],[23],[40]     $ 3,489 [13],[23],[40]                    
Spread 5.75% [13],[40]     5.75% [13],[40]         5.75% [13],[40] 5.75% [13],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     3,393 [13],[40]                      
Fair Value, Ending Balance $ 3,393 [13],[40]     $ 3,393 [13],[40]                    
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 3                            
Principal amount or par value $ 3,467 [13],[23],[40]     $ 3,467 [13],[23],[40]                    
Spread 5.75% [13],[40]     5.75% [13],[40]         5.75% [13],[40] 5.75% [13],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     3,372 [13],[40]                      
Fair Value, Ending Balance $ 3,372 [13],[40]     $ 3,372 [13],[40]                    
Investment, Identifier [Axis]: FS WhiteWater Holdings, LLC, Ordinary shares                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     4,686 [13],[40],[42]                      
Fair Value, Ending Balance 4,686 [13],[40],[42]   4,454 [16],[39],[43] 4,686 [13],[40],[42]                    
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First Lien - Drawn                            
Principal amount or par value     $ 1,006 [16],[17],[18],[20]                      
Spread     5.50% [16],[17],[20]     5.50% [16],[17],[20] 5.50% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 1,006 [16],[17],[20]                      
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First Lien 1                            
Principal amount or par value     $ 33,698 [16],[18],[21]                      
Spread     5.50% [16],[21]     5.50% [16],[21] 5.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 33,698 [16],[21]                      
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First Lien 2                            
Principal amount or par value     $ 347 [16],[17],[18]                      
Spread     5.50% [16],[17]     5.50% [16],[17] 5.50% [16],[17]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 347 [16],[17]                      
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 1                            
Principal amount or par value 2,095 [13],[14],[23],[24]   4,557 [16],[17],[18],[20] 2,095 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (21) [13],[14],[24]                      
Fair Value, Ending Balance (21) [13],[14],[24]   0 [16],[17],[20] (21) [13],[14],[24]                    
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 2                            
Principal amount or par value 4,907 [13],[14],[23],[24]   1,090 [16],[17],[18],[20] 4,907 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (49) [13],[14],[24]                      
Fair Value, Ending Balance (49) [13],[14],[24]   0 [16],[17],[20] (49) [13],[14],[24]                    
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien 1                            
Principal amount or par value $ 31,968 [13],[23],[27]     $ 31,968 [13],[23],[27]                    
Spread 5.50% [13],[27]     5.50% [13],[27]         5.50% [13],[27] 5.50% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     31,648 [13],[27]                      
Fair Value, Ending Balance $ 31,648 [13],[27]     $ 31,648 [13],[27]                    
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien 2                            
Principal amount or par value $ 2,072 [13],[14],[23],[24]     $ 2,072 [13],[14],[23],[24]                    
Spread 5.50% [13],[14],[24]     5.50% [13],[14],[24]         5.50% [13],[14],[24] 5.50% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     2,051 [13],[14],[24]                      
Fair Value, Ending Balance $ 2,051 [13],[14],[24]     $ 2,051 [13],[14],[24]                    
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First Lien - Drawn 1                            
Principal amount or par value     $ 143 [16],[17],[18],[20]                      
Spread     5.50% [16],[17],[20]     5.50% [16],[17],[20] 5.50% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 142 [16],[17],[20]                      
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First Lien - Drawn 2                            
Principal amount or par value     $ 138 [16],[17],[18],[20]                      
Spread     5.50% [16],[17],[20]     5.50% [16],[17],[20] 5.50% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 138 [16],[17],[20]                      
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First Lien 1                            
Principal amount or par value     $ 17,353 [16],[18],[21]                      
Spread     5.50% [16],[21]     5.50% [16],[21] 5.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 17,243 [16],[21]                      
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First Lien 2                            
Principal amount or par value     $ 10,092 [16],[18],[22]                      
Spread     5.50% [16],[22]     5.50% [16],[22] 5.50% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 10,028 [16],[22]                      
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First Lien 3                            
Principal amount or par value     $ 1,178 [16],[17],[18]                      
Spread     5.50% [16],[17]     5.50% [16],[17] 5.50% [16],[17]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 1,171 [16],[17]                      
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First Lien 4                            
Principal amount or par value     $ 80 [16],[17],[18]                      
Spread     5.50% [16],[17]     5.50% [16],[17] 5.50% [16],[17]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 80 [16],[17]                      
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Drawn                            
Principal amount or par value $ 381 [13],[14],[23],[24]     $ 381 [13],[14],[23],[24]                    
Spread 5.50% [13],[14],[24]     5.50% [13],[14],[24]         5.50% [13],[14],[24] 5.50% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     372 [13],[14],[24]                      
Fair Value, Ending Balance $ 372 [13],[14],[24]     $ 372 [13],[14],[24]                    
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 1                            
Principal amount or par value 81 [13],[14],[23],[24]   2,718 [16],[17],[18],[20] 81 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (2) [13],[14],[24]                      
Fair Value, Ending Balance (2) [13],[14],[24]   (17) [16],[17],[20] (2) [13],[14],[24]                    
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 2                            
Principal amount or par value 2,479 [13],[14],[23],[24]   4,435 [16],[17],[18],[20] 2,479 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (58) [13],[14],[24]                      
Fair Value, Ending Balance (58) [13],[14],[24]   (28) [16],[17],[20] (58) [13],[14],[24]                    
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 3                            
Principal amount or par value 4,886 [13],[14],[23],[24]     4,886 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (114) [13],[14],[24]                      
Fair Value, Ending Balance (114) [13],[14],[24]     (114) [13],[14],[24]                    
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 1                            
Principal amount or par value $ 17,529 [13],[23],[27]     $ 17,529 [13],[23],[27]                    
Spread 5.50% [13],[27]     5.50% [13],[27]         5.50% [13],[27] 5.50% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     17,119 [13],[27]                      
Fair Value, Ending Balance $ 17,119 [13],[27]     $ 17,119 [13],[27]                    
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 2                            
Principal amount or par value $ 10,195 [13],[23],[26]     $ 10,195 [13],[23],[26]                    
Spread 5.50% [13],[26]     5.50% [13],[26]         5.50% [13],[26] 5.50% [13],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     9,957 [13],[26]                      
Fair Value, Ending Balance $ 9,957 [13],[26]     $ 9,957 [13],[26]                    
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 3                            
Principal amount or par value $ 875 [13],[14],[23]     $ 875 [13],[14],[23]                    
Spread 5.50% [13],[14]     5.50% [13],[14]         5.50% [13],[14] 5.50% [13],[14]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     855 [13],[14]                      
Fair Value, Ending Balance $ 855 [13],[14]     $ 855 [13],[14]                    
Investment, Identifier [Axis]: Foundational Education Group, Inc. Second Lien 1                            
Principal amount or par value     $ 22,500 [16],[18],[39]                      
Spread     6.50% [16],[39]     6.50% [16],[39] 6.50% [16],[39]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 22,100 [16],[39]                      
Investment, Identifier [Axis]: Foundational Education Group, Inc. Second Lien 2                            
Principal amount or par value     $ 7,009 [16],[18],[21]                      
Spread     6.50% [16],[21]     6.50% [16],[21] 6.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 6,884 [16],[21]                      
Investment, Identifier [Axis]: Foundational Education Group, Inc., Second lien 1                            
Principal amount or par value $ 22,500 [13],[23],[40]     $ 22,500 [13],[23],[40]                    
Spread 6.50% [13],[40]     6.50% [13],[40]         6.50% [13],[40] 6.50% [13],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     20,810 [13],[40]                      
Fair Value, Ending Balance $ 20,810 [13],[40]     $ 20,810 [13],[40]                    
Investment, Identifier [Axis]: Foundational Education Group, Inc., Second lien 2                            
Principal amount or par value $ 7,009 [13],[23],[27]     $ 7,009 [13],[23],[27]                    
Spread 6.50% [13],[27]     6.50% [13],[27]         6.50% [13],[27] 6.50% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     6,483 [13],[27]                      
Fair Value, Ending Balance $ 6,483 [13],[27]     $ 6,483 [13],[27]                    
Investment, Identifier [Axis]: GC Waves Holdings, Inc. First Lien - Drawn                            
Principal amount or par value     $ 451 [13],[18],[20],[21]                      
Spread     6.00% [13],[20],[21]     6.00% [13],[20],[21] 6.00% [13],[20],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 451 [13],[20],[21]                      
Investment, Identifier [Axis]: GC Waves Holdings, Inc. First Lien 1                            
Principal amount or par value     $ 40,270 [13],[18],[21]                      
Spread     6.00% [13],[21]     6.00% [13],[21] 6.00% [13],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 40,270 [13],[21]                      
Investment, Identifier [Axis]: GC Waves Holdings, Inc. First Lien 2                            
Principal amount or par value     $ 21,666 [13],[18],[21]                      
Spread     6.00% [13],[21]     6.00% [13],[21] 6.00% [13],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 21,666 [13],[21]                      
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Drawn 1                            
Principal amount or par value $ 16,611 [13],[23],[24],[27]     $ 16,611 [13],[23],[24],[27]                    
Spread 5.50% [13],[24],[27]     5.50% [13],[24],[27]         5.50% [13],[24],[27] 5.50% [13],[24],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     16,411 [13],[24],[27]                      
Fair Value, Ending Balance $ 16,411 [13],[24],[27]     $ 16,411 [13],[24],[27]                    
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Drawn 2                            
Principal amount or par value $ 988 [13],[14],[23],[24]     $ 988 [13],[14],[23],[24]                    
Spread 5.50% [13],[14],[24]     5.50% [13],[14],[24]         5.50% [13],[14],[24] 5.50% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     976 [13],[14],[24]                      
Fair Value, Ending Balance $ 976 [13],[14],[24]     $ 976 [13],[14],[24]                    
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Undrawn                            
Principal amount or par value     3,951 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     0 [16],[17],[20]                      
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Undrawn 1                            
Principal amount or par value 757 [13],[23],[24],[27]     757 [13],[23],[24],[27]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (9) [13],[24],[27]                      
Fair Value, Ending Balance (9) [13],[24],[27]     (9) [13],[24],[27]                    
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Undrawn 2                            
Principal amount or par value 2,963 [13],[14],[23],[24]     2,963 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (36) [13],[14],[24]                      
Fair Value, Ending Balance (36) [13],[14],[24]     (36) [13],[14],[24]                    
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien 1                            
Principal amount or par value $ 21,885 [13],[23],[40]     $ 21,885 [13],[23],[40]                    
Spread 5.50% [13],[40]     5.50% [13],[40]         5.50% [13],[40] 5.50% [13],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     21,623 [13],[40]                      
Fair Value, Ending Balance $ 21,623 [13],[40]     $ 21,623 [13],[40]                    
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien 2                            
Principal amount or par value $ 13,211 [13],[23],[27]     $ 13,211 [13],[23],[27]                    
Spread 5.50% [13],[27]     5.50% [13],[27]         5.50% [13],[27] 5.50% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     13,052 [13],[27]                      
Fair Value, Ending Balance $ 13,052 [13],[27]     $ 13,052 [13],[27]                    
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien 3                            
Principal amount or par value $ 10,551 [13],[23],[27]     $ 10,551 [13],[23],[27]                    
Spread 5.50% [13],[27]     5.50% [13],[27]         5.50% [13],[27] 5.50% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     10,424 [13],[27]                      
Fair Value, Ending Balance $ 10,424 [13],[27]     $ 10,424 [13],[27]                    
Investment, Identifier [Axis]: GEDC Equity, LLC, Ordinary shares                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     150 [16],[17]                      
Investment, Identifier [Axis]: GS Acquisitionco, Inc. First Lien 1                            
Principal amount or par value     $ 34,023 [16],[18],[21]                      
Spread     5.50% [16],[21]     5.50% [16],[21] 5.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 34,023 [16],[21]                      
Investment, Identifier [Axis]: GS Acquisitionco, Inc. First Lien 2                            
Principal amount or par value     $ 21,521 [16],[18],[21]                      
Spread     5.50% [16],[21]     5.50% [16],[21] 5.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 21,521 [16],[21]                      
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Undrawn                            
Principal amount or par value 5,917 [13],[14],[23],[24]   3,730 [16],[17],[18],[20] 5,917 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (53) [13],[14],[24]                      
Fair Value, Ending Balance (53) [13],[14],[24]   0 [16],[17],[20] (53) [13],[14],[24]                    
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien 1                            
Principal amount or par value $ 67,275 [13],[23],[27]     $ 67,275 [13],[23],[27]                    
Spread 5.75% [13],[27]     5.75% [13],[27]         5.75% [13],[27] 5.75% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     66,675 [13],[27]                      
Fair Value, Ending Balance $ 66,675 [13],[27]     $ 66,675 [13],[27]                    
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien 2                            
Principal amount or par value $ 21,745 [13],[23],[27]     $ 21,745 [13],[23],[27]                    
Spread 5.75% [13],[27]     5.75% [13],[27]         5.75% [13],[27] 5.75% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     21,551 [13],[27]                      
Fair Value, Ending Balance $ 21,551 [13],[27]     $ 21,551 [13],[27]                    
Investment, Identifier [Axis]: Granicus, Inc. First Lien - Drawn                            
Principal amount or par value     $ 579 [16],[17],[18],[20]                      
Spread     6.50% [16],[17],[20]     6.50% [16],[17],[20] 6.50% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 579 [16],[17],[20]                      
Investment, Identifier [Axis]: Granicus, Inc. First Lien 1                            
Principal amount or par value     $ 15,463 [16],[18],[19]                      
Spread     5.50% [16],[19]     5.50% [16],[19] 5.50% [16],[19]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 15,463 [16],[19]                      
Investment, Identifier [Axis]: Granicus, Inc. First Lien 2                            
Principal amount or par value     $ 5,981 [16],[18],[22]                      
Spread     5.50% [16],[22]     5.50% [16],[22] 5.50% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 5,981 [16],[22]                      
Investment, Identifier [Axis]: Granicus, Inc. First Lien 3                            
Principal amount or par value     $ 5,899 [16],[18],[21]                      
Spread     5.50% [16],[21]     5.50% [16],[21] 5.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 5,899 [16],[21]                      
Investment, Identifier [Axis]: Granicus, Inc. First Lien 4                            
Principal amount or par value     $ 4,542 [16],[18],[21]                      
Spread     6.00% [16],[21]     6.00% [16],[21] 6.00% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 4,542 [16],[21]                      
Investment, Identifier [Axis]: Granicus, Inc., First lien - Drawn                            
Principal amount or par value $ 810 [13],[14],[23],[24]     $ 810 [13],[14],[23],[24]                    
Spread 6.50% [13],[14],[24]     6.50% [13],[14],[24]         6.50% [13],[14],[24] 6.50% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     810 [13],[14],[24]                      
Fair Value, Ending Balance $ 810 [13],[14],[24]     $ 810 [13],[14],[24]                    
Investment, Identifier [Axis]: Granicus, Inc., First lien - Undrawn                            
Principal amount or par value 1,604 [13],[14],[23],[24]     1,604 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[14],[24]                      
Fair Value, Ending Balance 0 [13],[14],[24]     0 [13],[14],[24]                    
Investment, Identifier [Axis]: Granicus, Inc., First lien - Undrawn 2                            
Principal amount or par value     1,834 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     0 [16],[17],[20]                      
Investment, Identifier [Axis]: Granicus, Inc., First lien 1                            
Principal amount or par value $ 15,405 [13],[23],[25]     $ 15,405 [13],[23],[25]                    
Spread 5.50% [13],[25],[28]     5.50% [13],[25],[28]         5.50% [13],[25],[28] 5.50% [13],[25],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     15,405 [13],[25]                      
Fair Value, Ending Balance $ 15,405 [13],[25]     $ 15,405 [13],[25]                    
Investment, Identifier [Axis]: Granicus, Inc., First lien 2                            
Principal amount or par value $ 5,959 [13],[23],[26]     $ 5,959 [13],[23],[26]                    
Spread 5.50% [13],[26],[28]     5.50% [13],[26],[28]         5.50% [13],[26],[28] 5.50% [13],[26],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     5,959 [13],[26]                      
Fair Value, Ending Balance $ 5,959 [13],[26]     $ 5,959 [13],[26]                    
Investment, Identifier [Axis]: Granicus, Inc., First lien 3                            
Principal amount or par value $ 5,877 [13],[23],[27]     $ 5,877 [13],[23],[27]                    
Spread 5.50% [13],[27],[28]     5.50% [13],[27],[28]         5.50% [13],[27],[28] 5.50% [13],[27],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     5,877 [13],[27]                      
Fair Value, Ending Balance $ 5,877 [13],[27]     $ 5,877 [13],[27]                    
Investment, Identifier [Axis]: Granicus, Inc., First lien 4                            
Principal amount or par value $ 4,579 [13],[23],[27]     $ 4,579 [13],[23],[27]                    
Spread 6.00% [13],[27]     6.00% [13],[27]         6.00% [13],[27] 6.00% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     4,579 [13],[27]                      
Fair Value, Ending Balance $ 4,579 [13],[27]     $ 4,579 [13],[27]                    
Investment, Identifier [Axis]: Greenway Health, LLC, First Lien                            
Principal amount or par value     $ 6,349 [18],[22]                      
Spread     6.75% [22]     6.75% [22] 6.75% [22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 6,254 [22]                      
Investment, Identifier [Axis]: Groundworks, LLC, First Lien                            
Principal amount or par value     $ 19,517 [16],[18],[19]                      
Spread     6.50% [16],[19]     6.50% [16],[19] 6.50% [16],[19]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 19,330 [16],[19]                      
Investment, Identifier [Axis]: Groundworks, LLC, First lien - Undrawn 1                            
Principal amount or par value     891 [16],[18],[19],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     (9) [16],[19],[20]                      
Investment, Identifier [Axis]: Groundworks, LLC, First lien - Undrawn 2                            
Principal amount or par value     1,076 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     (10) [16],[17],[20]                      
Investment, Identifier [Axis]: HB Wealth Management, LLC, Preferred shares                            
Preferred equity dividend rate       4.00%                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     5,126 [13],[44],[45]                      
Fair Value, Ending Balance 5,126 [13],[44],[45]   5,125 [16],[46] $ 5,126 [13],[44],[45]                    
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc. Second Lien 1                            
Principal amount or par value     $ 22,500 [16],[18],[39]                      
Spread     6.75% [16],[39]     6.75% [16],[39] 6.75% [16],[39]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 21,059 [16],[39]                      
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc. Second Lien 2                            
Principal amount or par value     $ 4,208 [16],[18],[21]                      
Spread     6.75% [16],[21]     6.75% [16],[21] 6.75% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 3,938 [16],[21]                      
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 1                            
Principal amount or par value $ 22,500 [13],[23],[40]     $ 22,500 [13],[23],[40]                    
Spread 6.75% [13],[40]     6.75% [13],[40]         6.75% [13],[40] 6.75% [13],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     21,409 [13],[40]                      
Fair Value, Ending Balance $ 21,409 [13],[40]     $ 21,409 [13],[40]                    
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 2                            
Principal amount or par value $ 4,208 [13],[23],[27]     $ 4,208 [13],[23],[27]                    
Spread 6.75% [13],[27]     6.75% [13],[27]         6.75% [13],[27] 6.75% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     4,004 [13],[27]                      
Fair Value, Ending Balance $ 4,004 [13],[27]     $ 4,004 [13],[27]                    
Investment, Identifier [Axis]: Haven Midstream Holdings LLC, Ordinary shares                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     35,679 [13],[47]                      
Fair Value, Ending Balance 35,679 [13],[47]   3,323 [16],[48] 35,679 [13],[47]                    
Investment, Identifier [Axis]: Haven Midstream Holdings LLC, Profit Interest                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     109 [13],[49]                      
Fair Value, Ending Balance 109 [13],[49]   96 [16],[50] 109 [13],[49]                    
Investment, Identifier [Axis]: Haven Midstream LLC, First lien - Undrawn                            
Principal amount or par value 8,000 [13],[14],[23],[24],[51]   8,000 [16],[17],[18],[20] 8,000 [13],[14],[23],[24],[51]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[14],[24],[51]                      
Fair Value, Ending Balance 0 [13],[14],[24],[51]   0 [16],[17],[20] 0 [13],[14],[24],[51]                    
Investment, Identifier [Axis]: Healthspan Buyer, LLC, First Lien                            
Principal amount or par value     $ 5,120 [16],[18],[22]                      
Spread     5.75% [16],[22]     5.75% [16],[22] 5.75% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 5,069 [16],[22]                      
Investment, Identifier [Axis]: Healthspan Buyer, LLC, First lien - Undrawn                            
Principal amount or par value     1,229 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     (12) [16],[17],[20]                      
Investment, Identifier [Axis]: Houghton Mifflin Harcourt Company, First Lien                            
Principal amount or par value     $ 6,822 [18],[22]                      
Spread     5.25% [22]     5.25% [22] 5.25% [22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 6,704 [22]                      
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First Lien 1                            
Principal amount or par value     $ 28,839 [16],[18],[21]                      
Spread     6.00% [16],[21]     6.00% [16],[21] 6.00% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 28,839 [16],[21]                      
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First Lien 2                            
Principal amount or par value     $ 4,214 [16],[18],[21]                      
Spread     6.00% [16],[21]     6.00% [16],[21] 6.00% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 4,214 [16],[21]                      
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien - Drawn                            
Principal amount or par value $ 919 [13],[14],[23],[24]     $ 919 [13],[14],[23],[24]                    
Spread 6.00% [13],[14],[24]     6.00% [13],[14],[24]         6.00% [13],[14],[24] 6.00% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     906 [13],[14],[24]                      
Fair Value, Ending Balance $ 906 [13],[14],[24]     $ 906 [13],[14],[24]                    
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien - Undrawn                            
Principal amount or par value 1,379 [13],[14],[23],[24]   2,298 [16],[17],[18],[20] 1,379 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (19) [13],[14],[24]                      
Fair Value, Ending Balance (19) [13],[14],[24]   0 [16],[17],[20] (19) [13],[14],[24]                    
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 1                            
Principal amount or par value $ 29,134 [13],[23],[27]     $ 29,134 [13],[23],[27]                    
Spread 6.00% [13],[27]     6.00% [13],[27]         6.00% [13],[27] 6.00% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     28,731 [13],[27]                      
Fair Value, Ending Balance $ 28,731 [13],[27]     $ 28,731 [13],[27]                    
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 2                            
Principal amount or par value $ 4,257 [13],[23],[27]     $ 4,257 [13],[23],[27]                    
Spread 6.00% [13],[27]     6.00% [13],[27]         6.00% [13],[27] 6.00% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     4,198 [13],[27]                      
Fair Value, Ending Balance $ 4,198 [13],[27]     $ 4,198 [13],[27]                    
Investment, Identifier [Axis]: IMO Investor Holdings, Inc. First Lien                            
Principal amount or par value     $ 12,844 [16],[18],[21]                      
Spread     6.00% [16],[21]     6.00% [16],[21] 6.00% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 12,742 [16],[21]                      
Investment, Identifier [Axis]: IMO Investor Holdings, Inc. First Lien - Drawn 1                            
Principal amount or par value     $ 1,139 [16],[17],[18],[20]                      
Spread     6.00% [16],[17],[20]     6.00% [16],[17],[20] 6.00% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 1,130 [16],[17],[20]                      
Investment, Identifier [Axis]: IMO Investor Holdings, Inc. First Lien - Drawn 2                            
Principal amount or par value     $ 62 [16],[17],[18],[20]                      
Spread     6.00% [16],[17],[20]     6.00% [16],[17],[20] 6.00% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 61 [16],[17],[20]                      
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien                            
Principal amount or par value $ 12,974 [13],[23],[27]     $ 12,974 [13],[23],[27]                    
Spread 6.00% [13],[27]     6.00% [13],[27]         6.00% [13],[27] 6.00% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     12,845 [13],[27]                      
Fair Value, Ending Balance $ 12,845 [13],[27]     $ 12,845 [13],[27]                    
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Drawn                            
Principal amount or par value $ 294 [13],[14],[23],[24]     $ 294 [13],[14],[23],[24]                    
Spread 6.00% [13],[14],[24]     6.00% [13],[14],[24]         6.00% [13],[14],[24] 6.00% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     291 [13],[14],[24]                      
Fair Value, Ending Balance $ 291 [13],[14],[24]     $ 291 [13],[14],[24]                    
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Undrawn 1                            
Principal amount or par value 1,254 [13],[14],[23],[24]   1,487 [16],[17],[18],[20] 1,254 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (13) [13],[14],[24]                      
Fair Value, Ending Balance (13) [13],[14],[24]   (12) [16],[17],[20] (13) [13],[14],[24]                    
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Undrawn 2                            
Principal amount or par value 3,097 [13],[14],[23],[24]   1,951 [16],[17],[18],[20] 3,097 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (31) [13],[14],[24]                      
Fair Value, Ending Balance (31) [13],[14],[24]   (16) [16],[17],[20] (31) [13],[14],[24]                    
Investment, Identifier [Axis]: Idera, Inc. Secnd Lien 1                            
Principal amount or par value     $ 22,500 [16],[18],[19]                      
Spread     6.75% [16],[19]     6.75% [16],[19] 6.75% [16],[19]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 22,500 [16],[19]                      
Investment, Identifier [Axis]: Idera, Inc. Secnd Lien 2                            
Principal amount or par value     $ 3,000 [16],[17],[18]                      
Spread     6.75% [16],[17]     6.75% [16],[17] 6.75% [16],[17]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 3,000 [16],[17]                      
Investment, Identifier [Axis]: Idera, Inc., Second lien 1                            
Principal amount or par value $ 22,500 [13],[23],[25]     $ 22,500 [13],[23],[25]                    
Spread 6.75% [13],[25]     6.75% [13],[25]         6.75% [13],[25] 6.75% [13],[25]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     21,168 [13],[25]                      
Fair Value, Ending Balance $ 21,168 [13],[25]     $ 21,168 [13],[25]                    
Investment, Identifier [Axis]: Idera, Inc., Second lien 2                            
Principal amount or par value $ 3,000 [13],[14],[23]     $ 3,000 [13],[14],[23]                    
Spread 6.75% [13],[14]     6.75% [13],[14]         6.75% [13],[14] 6.75% [13],[14]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     2,822 [13],[14]                      
Fair Value, Ending Balance $ 2,822 [13],[14]     $ 2,822 [13],[14]                    
Investment, Identifier [Axis]: Infogain Corporation, First Lien 1                            
Principal amount or par value     $ 18,707 [16],[18],[21]                      
Spread     5.50% [16],[21]     5.50% [16],[21] 5.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 18,707 [16],[21]                      
Investment, Identifier [Axis]: Infogain Corporation, First Lien 2                            
Principal amount or par value     $ 7,844 [16],[18],[22]                      
Spread     5.50% [16],[22]     5.50% [16],[22] 5.50% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 7,844 [16],[22]                      
Investment, Identifier [Axis]: Infogain Corporation, First lien - Drawn                            
Principal amount or par value $ 1,068 [13],[14],[23],[24]     $ 1,068 [13],[14],[23],[24]                    
Spread 5.75% [13],[14],[24]     5.75% [13],[14],[24]         5.75% [13],[14],[24] 5.75% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     1,048 [13],[14],[24]                      
Fair Value, Ending Balance $ 1,048 [13],[14],[24]     $ 1,048 [13],[14],[24]                    
Investment, Identifier [Axis]: Infogain Corporation, First lien - Undrawn                            
Principal amount or par value 2,759 [13],[14],[23],[24]   3,827 [16],[17],[18],[20] 2,759 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (52) [13],[14],[24]                      
Fair Value, Ending Balance (52) [13],[14],[24]   0 [16],[17],[20] (52) [13],[14],[24]                    
Investment, Identifier [Axis]: Infogain Corporation, First lien 1                            
Principal amount or par value $ 18,898 [16],[21],[23]     $ 18,898 [16],[21],[23]                    
Spread 5.75% [16],[21]     5.75% [16],[21]         5.75% [16],[21] 5.75% [16],[21]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     18,545 [16],[21]                      
Fair Value, Ending Balance $ 18,545 [16],[21]     $ 18,545 [16],[21]                    
Investment, Identifier [Axis]: Infogain Corporation, First lien 2                            
Principal amount or par value $ 7,923 [13],[23],[26]     $ 7,923 [13],[23],[26]                    
Spread 5.75% [13],[26]     5.75% [13],[26]         5.75% [13],[26] 5.75% [13],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     7,775 [13],[26]                      
Fair Value, Ending Balance $ 7,775 [13],[26]     $ 7,775 [13],[26]                    
Investment, Identifier [Axis]: Infogain Corporation, Subordinated                            
Principal amount or par value $ 17,245 [13],[14],[23]   $ 17,245 [16],[17],[18] $ 17,245 [13],[14],[23]                    
Spread 8.25% [13],[14]   8.25% [16],[17] 8.25% [13],[14]   8.25% [16],[17] 8.25% [16],[17]   8.25% [13],[14] 8.25% [13],[14]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     $ 16,846 [13],[14]                      
Fair Value, Ending Balance $ 16,846 [13],[14]   17,245 [16],[17] $ 16,846 [13],[14]                    
Investment, Identifier [Axis]: Integro Parent Inc., First lien 1                            
Principal amount or par value 4,187 [13],[23],[27]   4,086 [16],[18],[21] 4,187 [13],[23],[27]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     4,187 [13],[27]                      
Fair Value, Ending Balance 4,187 [13],[27]   4,086 [16],[21] 4,187 [13],[27]                    
Investment, Identifier [Axis]: Integro Parent Inc., First lien 2                            
Principal amount or par value 827 [13],[14],[23]   807 [16],[17],[18] 827 [13],[14],[23]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     828 [13],[14]                      
Fair Value, Ending Balance 828 [13],[14]   807 [16],[17] 828 [13],[14]                    
Investment, Identifier [Axis]: Integro Parent Inc., Second lien                            
Principal amount or par value 11,510 [13],[14],[23]   13,657 [16],[17],[18] 11,510 [13],[14],[23]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     8,718 [13],[14]                      
Fair Value, Ending Balance 8,718 [13],[14]   13,231 [16],[17] 8,718 [13],[14]                    
Investment, Identifier [Axis]: Integro Parent Inc., Second lien, Non-accrual status                            
Principal amount or par value                     $ 4,780      
Investment, Identifier [Axis]: KAMC Holdings, Inc, Second Lien 1                            
Principal amount or par value     $ 18,750 [16],[18],[21]                      
Spread     8.00% [16],[21]     8.00% [16],[21] 8.00% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 17,079 [16],[21]                      
Investment, Identifier [Axis]: KAMC Holdings, Inc, Second Lien 2                            
Principal amount or par value     $ 18,750 [16],[18],[22]                      
Spread     8.00% [16],[22]     8.00% [16],[22] 8.00% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 17,079 [16],[22]                      
Investment, Identifier [Axis]: KAMC Holdings, Inc., Second lien 1                            
Principal amount or par value $ 18,750 [13],[23],[27]     $ 18,750 [13],[23],[27]                    
Spread 8.00% [13],[27]     8.00% [13],[27]         8.00% [13],[27] 8.00% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     15,938 [13],[27]                      
Fair Value, Ending Balance $ 15,938 [13],[27]     $ 15,938 [13],[27]                    
Investment, Identifier [Axis]: KAMC Holdings, Inc., Second lien 2                            
Principal amount or par value $ 18,750 [13],[23],[26]     $ 18,750 [13],[23],[26]                    
Spread 8.00% [13],[26]     8.00% [13],[26]         8.00% [13],[26] 8.00% [13],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     15,937 [13],[26]                      
Fair Value, Ending Balance $ 15,937 [13],[26]     $ 15,937 [13],[26]                    
Investment, Identifier [Axis]: KPSKY Acquisition Inc. First Lien - Drawn 1                            
Principal amount or par value     $ 1,160 [16],[18],[20],[21]                      
Spread     5.25% [16],[20],[21]     5.25% [16],[20],[21] 5.25% [16],[20],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 1,138 [16],[20],[21]                      
Investment, Identifier [Axis]: KPSKY Acquisition Inc. First Lien - Drawn 2                            
Principal amount or par value     $ 19 [16],[17],[18],[20]                      
Spread     5.75% [16],[17],[20]     5.75% [16],[17],[20] 5.75% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 19 [16],[17],[20]                      
Investment, Identifier [Axis]: KPSKY Acquisition Inc. First Lien 1                            
Principal amount or par value     $ 6,898 [16],[18],[22]                      
Spread     5.25% [16],[22]     5.25% [16],[22] 5.25% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 6,763 [16],[22]                      
Investment, Identifier [Axis]: KPSKY Acquisition Inc. First Lien 2                            
Principal amount or par value     $ 790 [16],[18],[21]                      
Spread     5.25% [16],[21]     5.25% [16],[21] 5.25% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 774 [16],[21]                      
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Drawn                            
Principal amount or par value $ 145 [13],[23],[24],[27]     $ 145 [13],[23],[24],[27]                    
Spread 4.50% [13],[24],[27]     4.50% [13],[24],[27]         4.50% [13],[24],[27] 4.50% [13],[24],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     139 [13],[24],[27]                      
Fair Value, Ending Balance $ 139 [13],[24],[27]     $ 139 [13],[24],[27]                    
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Undrawn                            
Principal amount or par value 1,022 [13],[23],[24],[27]   1,568 [16],[17],[18],[20] 1,022 [13],[23],[24],[27]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (45) [13],[24],[27]                      
Fair Value, Ending Balance (45) [13],[24],[27]   (16) [16],[17],[20] (45) [13],[24],[27]                    
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 1                            
Principal amount or par value $ 6,968 [13],[23],[26]     $ 6,968 [13],[23],[26]                    
Spread 5.50% [13],[26]     5.50% [13],[26]         5.50% [13],[26] 5.50% [13],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     6,662 [13],[26]                      
Fair Value, Ending Balance $ 6,662 [13],[26]     $ 6,662 [13],[26]                    
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 2                            
Principal amount or par value $ 801 [13],[23],[27]     $ 801 [13],[23],[27]                    
Spread 4.50% [13],[27]     4.50% [13],[27]         4.50% [13],[27] 4.50% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     766 [13],[27]                      
Fair Value, Ending Balance $ 766 [13],[27]     $ 766 [13],[27]                    
Investment, Identifier [Axis]: Kaseya Inc. First Lien                            
Principal amount or par value     $ 63,633 [16],[18],[21]                      
Spread     3.50% [16],[21]     3.50% [16],[21] 3.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 63,633 [16],[21]                      
Investment, Identifier [Axis]: Kaseya Inc. First Lien - Drawn 1                            
Principal amount or par value     $ 973 [16],[17],[18],[20]                      
Spread     5.50% [16],[17],[20]     5.50% [16],[17],[20] 5.50% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 973 [16],[17],[20]                      
Investment, Identifier [Axis]: Kaseya Inc. First Lien - Drawn 2                            
Principal amount or par value     $ 237 [16],[17],[18],[20]                      
Spread     3.50% [16],[17],[20]     3.50% [16],[17],[20] 3.50% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 237 [16],[17],[20]                      
Investment, Identifier [Axis]: Kaseya Inc., First lien                            
Principal amount or par value $ 63,093 [16],[21],[23]     $ 63,093 [16],[21],[23]                    
Spread 5.75% [16],[21]     5.75% [16],[21]         5.75% [16],[21] 5.75% [16],[21]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     62,172 [16],[21]                      
Fair Value, Ending Balance $ 62,172 [16],[21]     $ 62,172 [16],[21]                    
Investment, Identifier [Axis]: Kaseya Inc., First lien - Undrawn 1                            
Principal amount or par value 3,851 [13],[14],[23],[24]   3,616 [16],[17],[18],[20] 3,851 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (56) [13],[14],[24]                      
Fair Value, Ending Balance (56) [13],[14],[24]   0 [16],[17],[20] (56) [13],[14],[24]                    
Investment, Identifier [Axis]: Kaseya Inc., First lien - Undrawn 2                            
Principal amount or par value 3,851 [13],[14],[23],[24]   2,888 [16],[17],[18],[20] 3,851 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (56) [13],[14],[24]                      
Fair Value, Ending Balance (56) [13],[14],[24]   0 [16],[17],[20] (56) [13],[14],[24]                    
Investment, Identifier [Axis]: Kele Holdco, Inc. First Lien                            
Principal amount or par value     $ 14,796 [16],[18],[39]                      
Spread     5.25% [16],[39]     5.25% [16],[39] 5.25% [16],[39]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 14,796 [16],[39]                      
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien - Undrawn                            
Principal amount or par value     1,799 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     0 [16],[17],[20]                      
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien                            
Principal amount or par value $ 15,788 [13],[23],[40]     $ 15,788 [13],[23],[40]                    
Spread 5.25% [13],[40]     5.25% [13],[40]         5.25% [13],[40] 5.25% [13],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     15,788 [13],[40]                      
Fair Value, Ending Balance $ 15,788 [13],[40]     $ 15,788 [13],[40]                    
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien - Undrawn                            
Principal amount or par value 1,799 [13],[14],[23],[24]     1,799 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[14],[24]                      
Fair Value, Ending Balance 0 [13],[14],[24]     0 [13],[14],[24]                    
Investment, Identifier [Axis]: Knockout Intermediate Holdings I Inc., Preferred shares                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     14,661 [13],[14],[52]                      
Fair Value, Ending Balance 14,661 [13],[14],[52]   $ 17,019 [16],[17] $ 14,661 [13],[14],[52]                    
Investment, Identifier [Axis]: Knockout Intermediate Holdings I, Preferred shares                            
Preferred equity dividend rate     11.75% 11.75%                    
Investment, Identifier [Axis]: MED Parentco, LP, Second Lien                            
Principal amount or par value     $ 20,857 [16],[18],[22]                      
Spread     8.25% [16],[22]     8.25% [16],[22] 8.25% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 20,119 [16],[22]                      
Investment, Identifier [Axis]: MED Parentco, LP, Second lien                            
Principal amount or par value $ 20,857 [23],[26]     $ 20,857 [23],[26]                    
Spread 8.25% [26]     8.25% [26]         8.25% [26] 8.25% [26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     15,726 [26]                      
Fair Value, Ending Balance $ 15,726 [26]     $ 15,726 [26]                    
Investment, Identifier [Axis]: MRI Software LLC, First Lien 1                            
Principal amount or par value     $ 21,655 [16],[18],[39]                      
Spread     5.50% [16],[39]     5.50% [16],[39] 5.50% [16],[39]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 21,598 [16],[39]                      
Investment, Identifier [Axis]: MRI Software LLC, First Lien 2                            
Principal amount or par value     $ 7,670 [16],[17],[18]                      
Spread     5.50% [16],[17]     5.50% [16],[17] 5.50% [16],[17]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 7,650 [16],[17]                      
Investment, Identifier [Axis]: MRI Software LLC, First Lien 3                            
Principal amount or par value     $ 4,568 [16],[18],[21]                      
Spread     5.50% [16],[21]     5.50% [16],[21] 5.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 4,557 [16],[21]                      
Investment, Identifier [Axis]: MRI Software LLC, First Lien 4                            
Principal amount or par value     $ 3,140 [16],[18],[21]                      
Spread     5.50% [16],[21]     5.50% [16],[21] 5.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 3,132 [16],[21]                      
Investment, Identifier [Axis]: MRI Software LLC, First Lien 5                            
Principal amount or par value     $ 801 [16],[17],[18]                      
Spread     5.50% [16],[17]     5.50% [16],[17] 5.50% [16],[17]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 800 [16],[17]                      
Investment, Identifier [Axis]: MRI Software LLC, First lien - Undrawn 1                            
Principal amount or par value 2,002 [13],[14],[23],[24]     2,002 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (45) [13],[14],[24]                      
Fair Value, Ending Balance (45) [13],[14],[24]     (45) [13],[14],[24]                    
Investment, Identifier [Axis]: MRI Software LLC, First lien - Undrawn                            
Principal amount or par value     2,002 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     (5) [16],[17],[20]                      
Investment, Identifier [Axis]: MRI Software LLC, First lien - Undrawn 2                            
Principal amount or par value 4,074 [13],[14],[23],[24]     4,074 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (92) [13],[14],[24]                      
Fair Value, Ending Balance (92) [13],[14],[24]     (92) [13],[14],[24]                    
Investment, Identifier [Axis]: MRI Software LLC, First lien 1                            
Principal amount or par value $ 21,879 [13],[23],[40]     $ 21,879 [13],[23],[40]                    
Spread 5.50% [13],[40]     5.50% [13],[40]         5.50% [13],[40] 5.50% [13],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     21,383 [13],[40]                      
Fair Value, Ending Balance $ 21,383 [13],[40]     $ 21,383 [13],[40]                    
Investment, Identifier [Axis]: MRI Software LLC, First lien 2                            
Principal amount or par value $ 4,615 [13],[23],[27]     $ 4,615 [13],[23],[27]                    
Spread 5.50% [13],[27]     5.50% [13],[27]         5.50% [13],[27] 5.50% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     4,511 [13],[27]                      
Fair Value, Ending Balance $ 4,511 [13],[27]     $ 4,511 [13],[27]                    
Investment, Identifier [Axis]: MRI Software LLC, First lien 3                            
Principal amount or par value $ 3,173 [13],[23],[27]     $ 3,173 [13],[23],[27]                    
Spread 5.50% [13],[27]     5.50% [13],[27]         5.50% [13],[27] 5.50% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     3,101 [13],[27]                      
Fair Value, Ending Balance $ 3,101 [13],[27]     $ 3,101 [13],[27]                    
Investment, Identifier [Axis]: MRI Software LLC, First lien 4                            
Principal amount or par value $ 3,664 [13],[14],[23]     $ 3,664 [13],[14],[23]                    
Spread 5.50% [13],[14]     5.50% [13],[14]         5.50% [13],[14] 5.50% [13],[14]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     3,581 [13],[14]                      
Fair Value, Ending Balance $ 3,581 [13],[14]     $ 3,581 [13],[14]                    
Investment, Identifier [Axis]: MRI Software LLC, First lien 5                            
Principal amount or par value $ 810 [13],[14],[23]     $ 810 [13],[14],[23]                    
Spread 5.50% [13],[14]     5.50% [13],[14]         5.50% [13],[14] 5.50% [13],[14]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     791 [13],[14]                      
Fair Value, Ending Balance $ 791 [13],[14]     $ 791 [13],[14]                    
Investment, Identifier [Axis]: NHME Holdings Corp., Ordinary shares                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[14]                      
Fair Value, Ending Balance 0 [13],[14]   0 [16],[17],[53] 0 [13],[14]                    
Investment, Identifier [Axis]: NHME Holdings Corp., Warrants                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[14],[54]                      
Fair Value, Ending Balance 0 [13],[14],[54]   0 [16],[17] 0 [13],[14],[54]                    
Investment, Identifier [Axis]: NM APP Canada Corp., Membership interest                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[36],[55]                      
Fair Value, Ending Balance 0 [13],[36],[55]   7 [16],[37],[56] 0 [13],[36],[55]                    
Investment, Identifier [Axis]: NM APP US LLC, Membership interest                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[55]                      
Fair Value, Ending Balance 0 [13],[55]     0 [13],[55]                    
Investment, Identifier [Axis]: NM CLFX LP, Membership interest                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     16,172 [13],[55]                      
Fair Value, Ending Balance 16,172 [13],[55]   11,731 [16],[56] 16,172 [13],[55]                    
Investment, Identifier [Axis]: NM DRVT LLC, Membership interest                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[55]                      
Fair Value, Ending Balance 0 [13],[55]     0 [13],[55]                    
Investment, Identifier [Axis]: NM GLCR LP, Membership interest                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[55]                      
Fair Value, Ending Balance 0 [13],[55]     0 [13],[55]                    
Investment, Identifier [Axis]: NM GP Holdco, LLC, Membership interest                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     1,028 [13],[36],[55]                      
Fair Value, Ending Balance 1,028 [13],[36],[55]   1,048 [16],[37],[56] 1,028 [13],[36],[55]                    
Investment, Identifier [Axis]: NM JRA LLC, Membership interest                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[55]                      
Fair Value, Ending Balance 0 [13],[55]     0 [13],[55]                    
Investment, Identifier [Axis]: NM KRLN LLC, Membership interest                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[55]                      
Fair Value, Ending Balance 0 [13],[55]     0 [13],[55]                    
Investment, Identifier [Axis]: NM NL Holdings, L.P., Membership interest                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     94,305 [13],[36],[55]                      
Fair Value, Ending Balance 94,305 [13],[36],[55]   96,071 [16],[56] 94,305 [13],[36],[55]                    
Investment, Identifier [Axis]: NM YI, LLC, Membership interest                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     9,481 [13],[55]                      
Fair Value, Ending Balance 9,481 [13],[55]   9,550 [16],[56] 9,481 [13],[55]                    
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc. First Lien - Drawn                            
Principal amount or par value     $ 5,012 [16],[17],[18],[20]                      
Spread     6.09% [16],[17],[20]     6.09% [16],[17],[20] 6.09% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 4,979 [16],[17],[20]                      
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc. First Lien 1                            
Principal amount or par value     $ 19,259 [16],[18],[22]                      
Spread     6.09% [16],[22]     6.09% [16],[22] 6.09% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 19,133 [16],[22]                      
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc. First Lien 2                            
Principal amount or par value     $ 4,913 [16],[18],[21]                      
Spread     6.09% [16],[21]     6.09% [16],[21] 6.09% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 4,881 [16],[21]                      
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien - Drawn                            
Principal amount or par value $ 1,635 [13],[14],[23],[24]     $ 1,635 [13],[14],[23],[24]                    
Spread 6.00% [13],[14],[24]     6.00% [13],[14],[24]         6.00% [13],[14],[24] 6.00% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     1,624 [13],[14],[24]                      
Fair Value, Ending Balance $ 1,624 [13],[14],[24]     $ 1,624 [13],[14],[24]                    
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien - Undrawn                            
Principal amount or par value 9,029 [13],[14],[23],[24]     9,029 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (63) [13],[14],[24]                      
Fair Value, Ending Balance (63) [13],[14],[24]     (63) [13],[14],[24]                    
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 1                            
Principal amount or par value $ 19,259 [13],[23],[26]     $ 19,259 [13],[23],[26]                    
Spread 6.00% [13],[26]     6.00% [13],[26]         6.00% [13],[26] 6.00% [13],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     19,124 [13],[26]                      
Fair Value, Ending Balance $ 19,124 [13],[26]     $ 19,124 [13],[26]                    
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 2                            
Principal amount or par value $ 4,913 [13],[23],[27]     $ 4,913 [13],[23],[27]                    
Spread 6.00% [13],[27]     6.00% [13],[27]         6.00% [13],[27] 6.00% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     4,879 [13],[27]                      
Fair Value, Ending Balance $ 4,879 [13],[27]     $ 4,879 [13],[27]                    
Investment, Identifier [Axis]: NMFC Senior Loan Program III LLC, Membership interest                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     140,000 [13],[14],[36]                      
Fair Value, Ending Balance 140,000 [13],[14],[36]   140,000 [16],[17] 140,000 [13],[14],[36]                    
Investment, Identifier [Axis]: NMFC Senior Loan Program IV LLC, Membership interest                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     112,400 [13],[14],[36]                      
Fair Value, Ending Balance 112,400 [13],[14],[36]   112,400 [16],[17] 112,400 [13],[14],[36]                    
Investment, Identifier [Axis]: National HME, Inc., Second lien                            
Principal amount or par value     8,281 [16],[17],[53]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     3,000 [16],[17],[53]                      
Other Income (1,500)                          
Investment, Identifier [Axis]: National HME, Inc., Second lien 1                            
Principal amount or par value 13,013 [13],[14],[23],[28]     13,013 [13],[14],[23],[28]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     5,381 [13],[14],[28]                      
Fair Value, Ending Balance 5,381 [13],[14],[28]     5,381 [13],[14],[28]                    
Investment, Identifier [Axis]: National HME, Inc., Second lien 2                            
Principal amount or par value 14,500 [13],[14],[23],[28]     14,500 [13],[14],[23],[28]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     $ 0 [13],[14],[28]                      
Fair Value, Ending Balance 0 [13],[14],[28]     0 [13],[14],[28]                    
Investment, Identifier [Axis]: National HME, Inc., Second lien, Tranche A Term Loan                            
Spread     5.00%     5.00% 5.00%              
Percentage of interest entitled to receive     20.00%     20.00% 20.00%              
Investment, Identifier [Axis]: National HME, Inc., Second lien, Tranche B Term Loan                            
Spread     6.00%     6.00% 6.00%              
Percentage of interest entitled to receive     20.00%     20.00% 20.00%              
Investment, Identifier [Axis]: Ncontracts, LLC, First Lien                            
Principal amount or par value     $ 8,372 [18],[21]                      
Spread     6.50% [21]     6.50% [21] 6.50% [21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 8,267 [21]                      
Investment, Identifier [Axis]: Ncontracts, LLC, First lien - Undrawn 1                            
Principal amount or par value     773 [17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     0 [17],[20]                      
Investment, Identifier [Axis]: Ncontracts, LLC, First lien - Undrawn 2                            
Principal amount or par value     773 [17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     (10) [17],[20]                      
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 1                            
Principal amount or par value $ 35,541 [13],[23],[27]   41,731 [16],[21] $ 35,541 [13],[23],[27]                    
Spread 2.50% [13],[27],[28]     2.50% [13],[27],[28]         2.50% [13],[27],[28] 2.50% [13],[27],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     35,541 [13],[27]                      
Fair Value, Ending Balance $ 35,541 [13],[27]   41,731 [16],[21] $ 35,541 [13],[27]                    
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 2                            
Principal amount or par value $ 8,720 [13],[23],[26]   19,798 [16],[17] $ 8,720 [13],[23],[26]                    
Spread 2.50% [13],[26],[28]     2.50% [13],[26],[28]         2.50% [13],[26],[28] 2.50% [13],[26],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     8,720 [13],[26]                      
Fair Value, Ending Balance $ 8,720 [13],[26]   19,798 [16],[17] $ 8,720 [13],[26]                    
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 3                            
Principal amount or par value $ 4,282 [13],[14],[23]   10,239 [16],[22] $ 4,282 [13],[14],[23]                    
Spread 2.50% [13],[14],[28]     2.50% [13],[14],[28]         2.50% [13],[14],[28] 2.50% [13],[14],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     4,282 [13],[14]                      
Fair Value, Ending Balance $ 4,282 [13],[14]   10,239 [16],[22] $ 4,282 [13],[14]                    
Investment, Identifier [Axis]: New Benevis Holdco, Inc., Subordinated                            
Principal amount or par value 18,687 [13],[14],[23]   21,092 [16],[17] 18,687 [13],[14],[23]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     14,950 [13],[14]                      
Fair Value, Ending Balance 14,950 [13],[14]   16,874 [16],[17] 14,950 [13],[14]                    
Investment, Identifier [Axis]: New Benevis Topco, LLC, Ordinary shares 1                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     34,490 [13],[27]                      
Fair Value, Ending Balance 34,490 [13],[27]   31,838 [16],[21] 34,490 [13],[27]                    
Investment, Identifier [Axis]: New Benevis Topco, LLC, Ordinary shares 2                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     8,462 [13],[26]                      
Fair Value, Ending Balance 8,462 [13],[26]   7,812 [16],[22] 8,462 [13],[26]                    
Investment, Identifier [Axis]: New Benevis Topco, LLC, Ordinary shares 3                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     7,701 [13],[14]                      
Fair Value, Ending Balance 7,701 [13],[14]   7,109 [16],[17] 7,701 [13],[14]                    
Investment, Identifier [Axis]: New Permian Holdco, Inc., Ordinary shares                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     26,000 [13],[14]                      
Fair Value, Ending Balance 26,000 [13],[14]   26,000 [16],[17] 26,000 [13],[14]                    
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien                            
Principal amount or par value 21,779 [13],[14],[23]   23,336 [16],[17] 21,779 [13],[14],[23]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     21,779 [13],[14]                      
Fair Value, Ending Balance 21,779 [13],[14]   23,335 [16],[17] 21,779 [13],[14]                    
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien - Drawn                            
Principal amount or par value 9,785 [13],[14],[23],[24]   13,835 [16],[17],[20] 9,785 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     9,785 [13],[14],[24]                      
Fair Value, Ending Balance 9,785 [13],[14],[24]   13,835 [16],[17],[20] 9,785 [13],[14],[24]                    
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien - Undrawn                            
Principal amount or par value 1,577 [13],[14],[23],[24]   8,060 [16],[17],[18],[20] 1,577 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[14],[24]                      
Fair Value, Ending Balance 0 [13],[14],[24]   0 [16],[17],[20] 0 [13],[14],[24]                    
Investment, Identifier [Axis]: New Trojan Parent, Inc. Second Lien                            
Principal amount or par value     $ 26,762 [16],[18],[21]                      
Spread     7.25% [16],[21]     7.25% [16],[21] 7.25% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 1,421 [16],[21]                      
Investment, Identifier [Axis]: New Trojan Parent, Inc., Second lien                            
Principal amount or par value $ 26,762 [13],[23],[27]     $ 26,762 [13],[23],[27]                    
Spread 7.25% [13],[27]     7.25% [13],[27]         7.25% [13],[27] 7.25% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     20,101 [13],[27]                      
Fair Value, Ending Balance $ 20,101 [13],[27]     $ 20,101 [13],[27]                    
Investment, Identifier [Axis]: Next Holdco, LLC, First Lien                            
Principal amount or par value     $ 3,520 [16],[18],[21]                      
Spread     6.00% [16],[21]     6.00% [16],[21] 6.00% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 3,494 [16],[21]                      
Investment, Identifier [Axis]: Next Holdco, LLC, First lien - Undrawn 1                            
Principal amount or par value     903 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     0 [16],[17],[20]                      
Investment, Identifier [Axis]: Next Holdco, LLC, First lien - Undrawn 2                            
Principal amount or par value     339 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     (3) [16],[17],[20]                      
Investment, Identifier [Axis]: Notorious Topco, LLC First Lien - Drawn 1                            
Principal amount or par value     $ 867 [16],[17],[18],[20]                      
Spread     6.75% [16],[17],[20]     6.75% [16],[17],[20] 6.75% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 803 [16],[17],[20]                      
Investment, Identifier [Axis]: Notorious Topco, LLC First Lien - Drawn 2                            
Principal amount or par value     $ 59 [16],[17],[18],[20]                      
Spread     6.75% [16],[17],[20]     6.75% [16],[17],[20] 6.75% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 55 [16],[17],[20]                      
Investment, Identifier [Axis]: Notorious Topco, LLC First Lien 1                            
Principal amount or par value     $ 9,950 [16],[18],[22]                      
Spread     6.75% [16],[22]     6.75% [16],[22] 6.75% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 9,215 [16],[22]                      
Investment, Identifier [Axis]: Notorious Topco, LLC First Lien 2                            
Principal amount or par value     $ 9,825 [16],[18],[22]                      
Spread     6.75% [16],[22]     6.75% [16],[22] 6.75% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 9,100 [16],[22]                      
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Drawn 1                            
Principal amount or par value $ 876 [13],[14],[23],[24]     $ 876 [13],[14],[23],[24]                    
Spread 6.75% [13],[14],[24]     6.75% [13],[14],[24]         6.75% [13],[14],[24] 6.75% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     861 [13],[14],[24]                      
Fair Value, Ending Balance $ 861 [13],[14],[24]     $ 861 [13],[14],[24]                    
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Drawn 2                            
Principal amount or par value $ 147 [13],[14],[23],[24]     $ 147 [13],[14],[23],[24]                    
Spread 6.75% [13],[14],[24]     6.75% [13],[14],[24]         6.75% [13],[14],[24] 6.75% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     145 [13],[14],[24]                      
Fair Value, Ending Balance $ 145 [13],[14],[24]     $ 145 [13],[14],[24]                    
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Undrawn                            
Principal amount or par value     822 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     (61) [16],[17],[20]                      
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Undrawn 1                            
Principal amount or par value 587 [13],[14],[23],[24]     587 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (10) [13],[14],[24]                      
Fair Value, Ending Balance (10) [13],[14],[24]     (10) [13],[14],[24]                    
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Undrawn 2                            
Principal amount or par value 734 [13],[14],[23],[24]     734 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (12) [13],[14],[24]                      
Fair Value, Ending Balance (12) [13],[14],[24]     (12) [13],[14],[24]                    
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 1                            
Principal amount or par value $ 10,051 [13],[23],[26]     $ 10,051 [13],[23],[26]                    
Spread 6.75% [13],[26]     6.75% [13],[26]         6.75% [13],[26] 6.75% [13],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     9,882 [13],[26]                      
Fair Value, Ending Balance $ 9,882 [13],[26]     $ 9,882 [13],[26]                    
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 2                            
Principal amount or par value $ 9,925 [13],[23],[26]     $ 9,925 [13],[23],[26]                    
Spread 6.75% [13],[26]     6.75% [13],[26]         6.75% [13],[26] 6.75% [13],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     9,758 [13],[26]                      
Fair Value, Ending Balance $ 9,758 [13],[26]     $ 9,758 [13],[26]                    
Investment, Identifier [Axis]: OA Buyer, Inc. First Lien 1                            
Principal amount or par value     $ 27,707 [16],[18],[21]                      
Spread     5.50% [16],[21]     5.50% [16],[21] 5.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 27,707 [16],[21]                      
Investment, Identifier [Axis]: OA Buyer, Inc. First Lien 2                            
Principal amount or par value     $ 1,754 [16],[18],[21]                      
Spread     5.50% [16],[21]     5.50% [16],[21] 5.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 1,754 [16],[21]                      
Investment, Identifier [Axis]: OA Buyer, Inc., First lien - Undrawn                            
Principal amount or par value 3,600 [13],[14],[23],[24],[57]   3,600 [16],[17],[18],[20] 3,600 [13],[14],[23],[24],[57]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (29) [13],[14],[24],[57]                      
Fair Value, Ending Balance (29) [13],[14],[24],[57]   0 [16],[17],[20] (29) [13],[14],[24],[57]                    
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 1                            
Principal amount or par value $ 27,989 [13],[23],[27]     $ 27,989 [13],[23],[27]                    
Spread 5.75% [13],[27]     5.75% [13],[27]         5.75% [13],[27] 5.75% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     27,763 [13],[27]                      
Fair Value, Ending Balance $ 27,763 [13],[27]     $ 27,763 [13],[27]                    
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 2                            
Principal amount or par value $ 1,772 [13],[23],[27]     $ 1,772 [13],[23],[27]                    
Spread 5.75% [13],[27]     5.75% [13],[27]         5.75% [13],[27] 5.75% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     1,757 [13],[27]                      
Fair Value, Ending Balance $ 1,757 [13],[27]     $ 1,757 [13],[27]                    
Investment, Identifier [Axis]: OA Topco, L.P., Ordinary shares                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     2,000 [13],[14],[57]                      
Fair Value, Ending Balance 2,000 [13],[14],[57]   $ 3,343 [16],[17],[58] $ 2,000 [13],[14],[57]                    
Investment, Identifier [Axis]: OEC Holdco, LLC, Preferred shares                            
Preferred equity dividend rate     11.00% 11.00%                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     $ 7,214 [13],[59]                      
Fair Value, Ending Balance 7,214 [13],[59]   8,115 [16],[60],[61] $ 7,214 [13],[59]                    
Investment, Identifier [Axis]: OEConnection LLC, Second Lien 1                            
Principal amount or par value     $ 23,406 [16],[18],[21]                      
Spread     7.00% [16],[21]     7.00% [16],[21] 7.00% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 23,406 [16],[21]                      
Investment, Identifier [Axis]: OEConnection LLC, Second Lien 2                            
Principal amount or par value     $ 12,044 [16],[18],[21]                      
Spread     7.00% [16],[21]     7.00% [16],[21] 7.00% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 12,044 [16],[21]                      
Investment, Identifier [Axis]: OEConnection LLC, Second lien                            
Number of investments held | investment     2     2 2              
Investment, Identifier [Axis]: OEConnection LLC, Second lien 1                            
Principal amount or par value $ 23,406 [13],[23],[27]     $ 23,406 [13],[23],[27]                    
Spread 7.00% [13],[27]     7.00% [13],[27]         7.00% [13],[27] 7.00% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     $ 22,687 [13],[27]                      
Fair Value, Ending Balance $ 22,687 [13],[27]     $ 22,687 [13],[27]                    
Investment, Identifier [Axis]: OEConnection LLC, Second lien 2                            
Principal amount or par value $ 12,044 [13],[23],[27]     $ 12,044 [13],[23],[27]                    
Spread 7.00% [13],[27]     7.00% [13],[27]         7.00% [13],[27] 7.00% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     11,674 [13],[27]                      
Fair Value, Ending Balance $ 11,674 [13],[27]     $ 11,674 [13],[27]                    
Investment, Identifier [Axis]: Oranje Holdco, Inc. First Lien 1                            
Principal amount or par value     $ 7,440 [16],[18],[22]                      
Spread     7.50% [16],[22]     7.50% [16],[22] 7.50% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 7,440 [16],[22]                      
Investment, Identifier [Axis]: Oranje Holdco, Inc. First Lien 2                            
Principal amount or par value     $ 7,440 [16],[18],[21]                      
Spread     7.50% [16],[21]     7.50% [16],[21] 7.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 7,440 [16],[21]                      
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien - Undrawn                            
Principal amount or par value     1,860 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     0 [16],[17],[20]                      
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC First Lien                            
Principal amount or par value     $ 7,514 [16],[18],[19]                      
Spread     5.75% [16],[19]     5.75% [16],[19] 5.75% [16],[19]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 7,514 [16],[19]                      
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien                            
Principal amount or par value $ 6,629 [13],[23],[25]     $ 6,629 [13],[23],[25]                    
Spread 5.75% [13],[25]     5.75% [13],[25]         5.75% [13],[25] 5.75% [13],[25]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     6,500 [13],[25]                      
Fair Value, Ending Balance $ 6,500 [13],[25]     $ 6,500 [13],[25]                    
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien - Drawn                            
Principal amount or par value $ 131 [13],[14],[23],[24]     $ 131 [13],[14],[23],[24]                    
Spread 5.75% [13],[14],[24]     5.75% [13],[14],[24]         5.75% [13],[14],[24] 5.75% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     129                      
Fair Value, Ending Balance $ 129     $ 129                    
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien - Undrawn                            
Principal amount or par value     486 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     0 [16],[17],[20]                      
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien - Undrawn 1                            
Principal amount or par value 355 [13],[14],[23],[24]     355 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (7) [13],[14],[24]                      
Fair Value, Ending Balance (7) [13],[14],[24]     (7) [13],[14],[24]                    
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien - Undrawn 2                            
Principal amount or par value 885 [13],[23],[24],[25]     885 [13],[23],[24],[25]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (17) [13],[24],[25]                      
Fair Value, Ending Balance (17) [13],[24],[25]     (17) [13],[24],[25]                    
Investment, Identifier [Axis]: PPVA Black Elk (Equity) LLC, Subordinated                            
Principal amount or par value $ 14,500 [13],[14],[23]     $ 14,500 [13],[14],[23]                   $ 20,000
Spread 0.00% [13],[14]     0.00% [13],[14]         0.00% [13],[14] 0.00% [13],[14]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     7,995 [13],[14]                      
Fair Value, Ending Balance $ 7,995 [13],[14]   7,975 $ 7,995 [13],[14]                    
Investment, Identifier [Axis]: PPVA Black Elk (Equity) LLC, Subordinated                            
Principal amount or par value     14,500 [16],[17],[18]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     7,975 [16],[17]                      
Investment, Identifier [Axis]: PPVA Fund, L.P., Collateralized Financing                            
Principal amount or par value $ 0 [23],[32],[62]   $ 0 [18],[30],[63] $ 0 [23],[32],[62]                    
Spread 0.00% [32],[62]   0.00% [30],[63] 0.00% [32],[62]   0.00% [30],[63] 0.00% [30],[63]   0.00% [32],[62] 0.00% [32],[62]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     $ 0 [32],[62]                      
Fair Value, Ending Balance $ 0 [32],[62]   0 [30],[63] $ 0 [32],[62]                    
Investment, Identifier [Axis]: Permian Trust, First lien 1                            
Principal amount or par value 247 [13],[23],[64]   247 [16],[18],[65] 247 [13],[23],[64]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[64]                      
Fair Value, Ending Balance 0 [13],[64]   0 [16],[65] 0 [13],[64]                    
Investment, Identifier [Axis]: Permian Trust, First lien 2                            
Principal amount or par value 3,409 [13],[14],[23]   3,409 [16],[17],[18] 3,409 [13],[14],[23]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[14]                      
Fair Value, Ending Balance 0 [13],[14]   0 [16],[17] 0 [13],[14]                    
Investment, Identifier [Axis]: PetVet Care Centers, LLC, First Lien                            
Principal amount or par value     $ 28,430 [18],[21]                      
Spread     6.00% [21]     6.00% [21] 6.00% [21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 28,439 [21]                      
Investment, Identifier [Axis]: PetVet Care Centers, LLC, First lien - Undrawn 1                            
Principal amount or par value     3,708 [17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     1 [17],[20]                      
Investment, Identifier [Axis]: PetVet Care Centers, LLC, First lien - Undrawn 2                            
Principal amount or par value     3,708 [17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     0 [17],[20]                      
Investment, Identifier [Axis]: PhyNet Dermatology LLC, First lien 1                            
Principal amount or par value $ 49,270 [13],[23],[27]     $ 49,270 [13],[23],[27]                    
Spread 6.25% [13],[27]     6.25% [13],[27]         6.25% [13],[27] 6.25% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     49,270 [13],[27]                      
Fair Value, Ending Balance $ 49,270 [13],[27]     $ 49,270 [13],[27]                    
Investment, Identifier [Axis]: PhyNet Dermatology LLC, First lien 2                            
Principal amount or par value $ 18,726 [13],[23],[27]     $ 18,726 [13],[23],[27]                    
Spread 6.25% [13],[27]     6.25% [13],[27]         6.25% [13],[27] 6.25% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     18,726 [13],[27]                      
Fair Value, Ending Balance $ 18,726 [13],[27]     $ 18,726 [13],[27]                    
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First Lien 1                            
Principal amount or par value     16,802 [16],[18],[22]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     16,802 [16],[22]                      
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First Lien 2                            
Principal amount or par value     2,303 [16],[18],[22]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     2,303 [16],[22]                      
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien - Undrawn                            
Principal amount or par value 2,446 [13],[14],[23],[24],[66]   2,446 [16],[17],[18],[20] 2,446 [13],[14],[23],[24],[66]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (32) [13],[14],[24],[66]                      
Fair Value, Ending Balance (32) [13],[14],[24],[66]   0 [16],[17],[20] (32) [13],[14],[24],[66]                    
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien 1                            
Principal amount or par value 14,900 [13],[23],[26]     14,900 [13],[23],[26]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     14,706 [13],[26]                      
Fair Value, Ending Balance 14,706 [13],[26]     14,706 [13],[26]                    
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien 2                            
Principal amount or par value 2,042 [13],[23],[26]     2,042 [13],[23],[26]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     2,016 [13],[26]                      
Fair Value, Ending Balance 2,016 [13],[26]     2,016 [13],[26]                    
Investment, Identifier [Axis]: Pioneer Topco I, L.P., Ordinary shares                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     1,631 [13],[66],[67]                      
Fair Value, Ending Balance 1,631 [13],[66],[67]   1,796 [16],[68],[69] 1,631 [13],[66],[67]                    
Investment, Identifier [Axis]: Power Grid Holdings, Inc. First Lien                            
Principal amount or par value     $ 18,193 [16],[18],[19]                      
Spread     4.75% [16],[19]     4.75% [16],[19] 4.75% [16],[19]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 18,011 [16],[19]                      
Investment, Identifier [Axis]: Power Grid Holdings, Inc. First Lien - Drawn                            
Principal amount or par value     $ 214 [16],[17],[18],[20]                      
Spread     4.75% [16],[17],[20]     4.75% [16],[17],[20] 4.75% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 212 [16],[17],[20]                      
Investment, Identifier [Axis]: Power Grid Holdings, Inc., First lien - Undrawn                            
Principal amount or par value     4,075 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     (41) [16],[17],[20]                      
Investment, Identifier [Axis]: Project Essential Super Parent, Inc., Preferred shares                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     11,569 [13],[14],[70]                      
Fair Value, Ending Balance 11,569 [13],[14],[70]   12,382 [16],[17] $ 11,569 [13],[14],[70]                    
Preferred equity variable rate margin       9.50%                    
Investment, Identifier [Axis]: Project Power Buyer, LLC, First Lien                            
Principal amount or par value     $ 3,553 [16],[18],[21]                      
Spread     7.00% [16],[21]     7.00% [16],[21] 7.00% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 3,553 [16],[21]                      
Investment, Identifier [Axis]: Project Power Buyer, LLC, First lien - Undrawn                            
Principal amount or par value     184 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     0 [16],[17],[20]                      
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First Lien                            
Principal amount or par value     $ 5,109 [16],[18],[21]                      
Spread     5.50% [16],[21]     5.50% [16],[21] 5.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 5,109 [16],[21]                      
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien                            
Principal amount or par value $ 5,161 [13],[23],[27]     $ 5,161 [13],[23],[27]                    
Spread 5.50% [13],[27]     5.50% [13],[27]         5.50% [13],[27] 5.50% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     5,014 [13],[27]                      
Fair Value, Ending Balance $ 5,014 [13],[27]     $ 5,014 [13],[27]                    
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien - Drawn                            
Principal amount or par value $ 422 [13],[14],[23],[24]     $ 422 [13],[14],[23],[24]                    
Spread 5.50% [13],[14],[24]     5.50% [13],[14],[24]         5.50% [13],[14],[24] 5.50% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     410 [13],[14],[24]                      
Fair Value, Ending Balance $ 410 [13],[14],[24]     $ 410 [13],[14],[24]                    
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien - Undrawn                            
Principal amount or par value 483 [13],[14],[23],[24]   1,161 [16],[17],[18],[20] 483 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (14) [13],[14],[24]                      
Fair Value, Ending Balance (14) [13],[14],[24]   0 [16],[17],[20] (14) [13],[14],[24]                    
Investment, Identifier [Axis]: Quartz Holding Company, Second Lien                            
Principal amount or par value     $ 10,000 [16],[17],[18]                      
Spread     8.00% [16],[17]     8.00% [16],[17] 8.00% [16],[17]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 10,000 [16],[17]                      
Investment, Identifier [Axis]: Quartz Holding Company, Second lien                            
Principal amount or par value $ 10,000 [13],[14],[23]     $ 10,000 [13],[14],[23]                    
Spread 8.00% [13],[14]     8.00% [13],[14]         8.00% [13],[14] 8.00% [13],[14]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     9,802 [13],[14]                      
Fair Value, Ending Balance $ 9,802 [13],[14]     $ 9,802 [13],[14]                    
Investment, Identifier [Axis]: Recorded Future, Inc. First Lien 1                            
Principal amount or par value     $ 24,220 [16],[18],[22]                      
Spread     5.25% [16],[22]     5.25% [16],[22] 5.25% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 24,220 [16],[22]                      
Investment, Identifier [Axis]: Recorded Future, Inc. First Lien 2                            
Principal amount or par value     $ 12,524 [16],[18],[21]                      
Spread     5.25% [16],[21]     5.25% [16],[21] 5.25% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 12,524 [16],[21]                      
Investment, Identifier [Axis]: Recorded Future, Inc., First lien - Undrawn                            
Principal amount or par value 2,981 [13],[14],[23],[24]   2,981 [16],[17],[18],[20] 2,981 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (25) [13],[14],[24]                      
Fair Value, Ending Balance (25) [13],[14],[24]   0 [16],[17],[20] (25) [13],[14],[24]                    
Investment, Identifier [Axis]: Recorded Future, Inc., First lien 1                            
Principal amount or par value $ 24,469 [13],[23],[26]     $ 24,469 [13],[23],[26]                    
Spread 5.25% [13],[26]     5.25% [13],[26]         5.25% [13],[26] 5.25% [13],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     24,263 [13],[26]                      
Fair Value, Ending Balance $ 24,263 [13],[26]     $ 24,263 [13],[26]                    
Investment, Identifier [Axis]: Recorded Future, Inc., First lien 2                            
Principal amount or par value $ 12,652 [13],[23],[27]     $ 12,652 [13],[23],[27]                    
Spread 5.25% [13],[27]     5.25% [13],[27]         5.25% [13],[27] 5.25% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     12,546 [13],[27]                      
Fair Value, Ending Balance $ 12,546 [13],[27]     $ 12,546 [13],[27]                    
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First Lien                            
Principal amount or par value     $ 6,904 [16],[18],[21]                      
Spread     5.25% [16],[21]     5.25% [16],[21] 5.25% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 6,904 [16],[21]                      
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First Lien - Drawn                            
Principal amount or par value     $ 384 [16],[17],[18],[20]                      
Spread     4.25% [16],[17],[20]     4.25% [16],[17],[20] 4.25% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 384 [16],[17],[20]                      
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien                            
Principal amount or par value $ 6,975 [13],[23],[27]     $ 6,975 [13],[23],[27]                    
Spread 5.25% [13],[27]     5.25% [13],[27]         5.25% [13],[27] 5.25% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     6,861 [13],[27]                      
Fair Value, Ending Balance $ 6,861 [13],[27]     $ 6,861 [13],[27]                    
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Undrawn                            
Principal amount or par value 512 [13],[14],[23],[24]   128 [16],[17],[18],[20] 512 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (8) [13],[14],[24]                      
Fair Value, Ending Balance (8) [13],[14],[24]   0 [16],[17],[20] (8) [13],[14],[24]                    
Investment, Identifier [Axis]: Sierra Enterprises, LLC, First Lien                            
Principal amount or par value     $ 23,780 [17],[18]                      
Spread     2.50% [17]     2.50% [17] 2.50% [17]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 22,055 [17]                      
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation, Ordinary shares 1                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     3,599 [13],[27]                      
Fair Value, Ending Balance 3,599 [13],[27]   1,799 [16],[21] 3,599 [13],[27]                    
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation, Ordinary shares 2                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     401 [13],[14]                      
Fair Value, Ending Balance 401 [13],[14]   201 [16],[17] 401 [13],[14]                    
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation, Second lien                            
Principal amount or par value 5 [13],[14],[23]     5 [13],[14],[23]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[14]                      
Fair Value, Ending Balance 0 [13],[14]     0 [13],[14]                    
Investment, Identifier [Axis]: Specialtycare, Inc. First Lien - Drawn                            
Principal amount or par value     $ 78 [16],[17],[18],[20]                      
Spread     4.00% [16],[17],[20]     4.00% [16],[17],[20] 4.00% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 76 [16],[17],[20]                      
Investment, Identifier [Axis]: Specialtycare, Inc. First Lien 1                            
Principal amount or par value     $ 10,352 [16],[18],[21]                      
Spread     5.75% [16],[21]     5.75% [16],[21] 5.75% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 9,938 [16],[21]                      
Investment, Identifier [Axis]: Specialtycare, Inc. First Lien 2                            
Principal amount or par value     $ 78 [16],[17],[18]                      
Spread     5.75% [16],[17]     5.75% [16],[17] 5.75% [16],[17]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 76 [16],[17]                      
Investment, Identifier [Axis]: Specialtycare, Inc., First lien                            
Principal amount or par value $ 10,458 [13],[23],[27]     $ 10,458 [13],[23],[27]                    
Spread 5.75% [13],[27]     5.75% [13],[27]         5.75% [13],[27] 5.75% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     10,019 [13],[27]                      
Fair Value, Ending Balance $ 10,019 [13],[27]     $ 10,019 [13],[27]                    
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Drawn 1                            
Principal amount or par value $ 212 [13],[14],[23],[24]     $ 212 [13],[14],[23],[24]                    
Spread 4.00% [13],[14],[24]     4.00% [13],[14],[24]         4.00% [13],[14],[24] 4.00% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     204 [13],[14],[24]                      
Fair Value, Ending Balance $ 204 [13],[14],[24]     $ 204 [13],[14],[24]                    
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Drawn 2                            
Principal amount or par value $ 79 [13],[14],[23],[24]     $ 79 [13],[14],[23],[24]                    
Spread 5.75% [13],[14],[24]     5.75% [13],[14],[24]         5.75% [13],[14],[24] 5.75% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     75 [13],[14],[24]                      
Fair Value, Ending Balance $ 75 [13],[14],[24]     $ 75 [13],[14],[24]                    
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Undrawn                            
Principal amount or par value     481 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     (17) [16],[17],[20]                      
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Undrawn 1                            
Principal amount or par value 347 [13],[14],[23],[24]     347 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (15) [13],[14],[24]                      
Fair Value, Ending Balance (15) [13],[14],[24]     (15) [13],[14],[24]                    
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Undrawn 2                            
Principal amount or par value 868 [13],[14],[23],[24]     868 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (36) [13],[14],[24]                      
Fair Value, Ending Balance (36) [13],[14],[24]     (36) [13],[14],[24]                    
Investment, Identifier [Axis]: Spring Education Group, Inc (fka SSH Group Holdings, Inc.), Second lien                            
Principal amount or par value $ 21,959 [13],[23],[27]     $ 21,959 [13],[23],[27]                    
Spread 8.25% [13],[27]     8.25% [13],[27]         8.25% [13],[27] 8.25% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     21,324 [13],[27]                      
Fair Value, Ending Balance $ 21,324 [13],[27]     $ 21,324 [13],[27]                    
Investment, Identifier [Axis]: Sun Acquirer Corp. First Lien - Drawn                            
Principal amount or par value     $ 112 [16],[17],[18],[20]                      
Spread     5.75% [16],[17],[20]     5.75% [16],[17],[20] 5.75% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 110 [16],[17],[20]                      
Investment, Identifier [Axis]: Sun Acquirer Corp. First Lien 1                            
Principal amount or par value     $ 3,945 [16],[18],[21]                      
Spread     5.75% [16],[21]     5.75% [16],[21] 5.75% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 3,878 [16],[21]                      
Investment, Identifier [Axis]: Sun Acquirer Corp. First Lien 2                            
Principal amount or par value     $ 2,788 [16],[18],[21]                      
Spread     5.75% [16],[21]     5.75% [16],[21] 5.75% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 2,740 [16],[21]                      
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien                            
Principal amount or par value $ 3,985 [13],[23],[27]     $ 3,985 [13],[23],[27]                    
Spread 5.75% [13],[27]     5.75% [13],[27]         5.75% [13],[27] 5.75% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     3,917 [13],[27]                      
Fair Value, Ending Balance $ 3,917 [13],[27]     $ 3,917 [13],[27]                    
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Drawn                            
Principal amount or par value $ 2,791 [13],[23],[24],[27]     $ 2,791 [13],[23],[24],[27]                    
Spread 5.75% [13],[24],[27]     5.75% [13],[24],[27]         5.75% [13],[24],[27] 5.75% [13],[24],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     2,744 [13],[24],[27]                      
Fair Value, Ending Balance $ 2,744 [13],[24],[27]     $ 2,744 [13],[24],[27]                    
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Undrawn                            
Principal amount or par value     447 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     (8) [16],[17],[20]                      
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Undrawn 1                            
Principal amount or par value 559 [13],[14],[23],[24]     559 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (9) [13],[14],[24]                      
Fair Value, Ending Balance (9) [13],[14],[24]     (9) [13],[14],[24]                    
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Undrawn 2                            
Principal amount or par value 152 [13],[23],[24],[27]     152 [13],[23],[24],[27]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (3) [13],[24],[27]                      
Fair Value, Ending Balance (3) [13],[24],[27]     $ (3) [13],[24],[27]                    
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc., Preferred shares                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Preferred equity variable rate margin       10.50%                    
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc., Preferred shares 1                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     11,396 [13],[25]                      
Fair Value, Ending Balance 11,396 [13],[25]   13,807 [16],[19] $ 11,396 [13],[25]                    
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc., Preferred shares 2                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     3,929 [13],[14]                      
Fair Value, Ending Balance 3,929 [13],[14]   4,759 [16],[17] 3,929 [13],[14]                    
Investment, Identifier [Axis]: Syndigo LLC, Second Lien 1                            
Principal amount or par value     $ 22,500 [16],[18],[19]                      
Spread     8.00% [16],[19]     8.00% [16],[19] 8.00% [16],[19]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 22,500 [16],[19]                      
Investment, Identifier [Axis]: Syndigo LLC, Second Lien 2                            
Principal amount or par value     $ 5,697 [16],[18],[21]                      
Spread     8.00% [16],[21]     8.00% [16],[21] 8.00% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 5,697 [16],[21]                      
Investment, Identifier [Axis]: Syndigo LLC, Second lien 1                            
Principal amount or par value $ 22,500 [23]     $ 22,500 [23]                    
Spread 8.00%     8.00%         8.00% 8.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     21,067                      
Fair Value, Ending Balance $ 21,067     $ 21,067                    
Investment, Identifier [Axis]: Syndigo LLC, Second lien 2                            
Principal amount or par value $ 5,697 [13],[23],[27]     $ 5,697 [13],[23],[27]                    
Spread 8.00% [13],[27]     8.00% [13],[27]         8.00% [13],[27] 8.00% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     5,334 [13],[27]                      
Fair Value, Ending Balance $ 5,334 [13],[27]     $ 5,334 [13],[27]                    
Investment, Identifier [Axis]: TMK Hawk Parent, Corp, First Lien 1                            
Principal amount or par value     $ 16,227 [16],[18],[21]                      
Spread     3.50% [16],[21]     3.50% [16],[21] 3.50% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 9,736 [16],[21]                      
Investment, Identifier [Axis]: TMK Hawk Parent, Corp, First Lien 2                            
Principal amount or par value     $ 15,651 [16],[18],[22]                      
Spread     3.50% [16],[22]     3.50% [16],[22] 3.50% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 9,392 [16],[22]                      
Investment, Identifier [Axis]: TMK Hawk Parent, Corp, First Lien 3                            
Principal amount or par value     $ 1,033 [18],[21]                      
Spread     9.50% [21]     9.50% [21] 9.50% [21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 1,033 [21]                      
Investment, Identifier [Axis]: TMK Hawk Parent, Corp, First Lien 4                            
Principal amount or par value     $ 996 [18],[22]                      
Spread     9.50% [22]     9.50% [22] 9.50% [22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 996 [22]                      
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 1                            
Principal amount or par value $ 16,395 [13],[23],[27]     $ 16,395 [13],[23],[27]                    
Spread 3.50% [13],[27]     3.50% [13],[27]         3.50% [13],[27] 3.50% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     10,657 [13],[27]                      
Fair Value, Ending Balance $ 10,657 [13],[27]     $ 10,657 [13],[27]                    
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 2                            
Principal amount or par value $ 15,813 [13],[23],[26]     $ 15,813 [13],[23],[26]                    
Spread 3.50% [13],[26]     3.50% [13],[26]         3.50% [13],[26] 3.50% [13],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     10,277 [13],[26]                      
Fair Value, Ending Balance $ 10,277 [13],[26]     $ 10,277 [13],[26]                    
Investment, Identifier [Axis]: TRC Companies L.L.C. (fka Energize Holdco LLC) Second Lien                            
Principal amount or par value     $ 7,950 [16],[18],[21]                      
Spread     6.75% [16],[21]     6.75% [16],[21] 6.75% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 7,711 [16],[21]                      
Investment, Identifier [Axis]: TRC Companies L.L.C. (fka Energize Holdco LLC), Second lien                            
Principal amount or par value $ 7,950 [13],[23],[27]     $ 7,950 [13],[23],[27]                    
Spread 6.75% [13],[27]     6.75% [13],[27]         6.75% [13],[27] 6.75% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     $ 7,488 [13],[27]                      
Fair Value, Ending Balance $ 7,488 [13],[27]     $ 7,488 [13],[27]                    
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC, Ordinary shares                            
Ordinary shares dividend rate     12.00% 12.00%                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     $ 110,314 [13],[14]                      
Fair Value, Ending Balance 110,314 [13],[14]   95,151 [16],[17] $ 110,314 [13],[14]                    
Investment, Identifier [Axis]: Tahoe Finco, LLC, First lien - Undrawn                            
Principal amount or par value 4,439 [13],[14],[23],[24],[36]     4,439 [13],[14],[23],[24],[36]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (71) [13],[14],[24],[36]                      
Fair Value, Ending Balance (71) [13],[14],[24],[36]     (71) [13],[14],[24],[36]                    
Investment, Identifier [Axis]: Tahoe Finco, LLC, First lien 1                            
Principal amount or par value $ 35,000 [13],[23],[26],[36]     $ 35,000 [13],[23],[26],[36]                    
Spread 6.00% [13],[26],[36]     6.00% [13],[26],[36]         6.00% [13],[26],[36] 6.00% [13],[26],[36]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     34,436 [13],[26],[36]                      
Fair Value, Ending Balance $ 34,436 [13],[26],[36]     $ 34,436 [13],[26],[36]                    
Investment, Identifier [Axis]: Tahoe Finco, LLC, First lien 2                            
Principal amount or par value $ 24,189 [13],[23],[26],[36]     $ 24,189 [13],[23],[26],[36]                    
Spread 6.00% [13],[26],[36]     6.00% [13],[26],[36]         6.00% [13],[26],[36] 6.00% [13],[26],[36]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     23,800 [13],[26],[36]                      
Fair Value, Ending Balance $ 23,800 [13],[26],[36]     $ 23,800 [13],[26],[36]                    
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien - Drawn 1                            
Principal amount or par value 13,941     13,941                    
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 1                            
Principal amount or par value $ 15,562   $ 16,600 $ 15,562   £ 13,039 [16],[18],[68],[71]     £ 12,879 [13],[14],[23],[72]          
Spread 7.00% [13],[14],[72]   5.00% [16],[31],[68],[71] 7.00% [13],[14],[72]   5.00% [16],[31],[68],[71] 5.00% [16],[31],[68],[71]   7.00% [13],[14],[72] 7.00% [13],[14],[72]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     $ 15,562 [13],[14],[72]                      
Fair Value, Ending Balance $ 15,562 [13],[14],[72]   $ 16,600 [16],[68],[71] $ 15,562 [13],[14],[72]                    
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 2                            
Principal amount or par value | £           £ 10,734 [16],[18],[68],[71]     £ 10,538 [13],[14],[23],[72]          
Spread 7.00% [13],[14],[72]   5.00% [16],[31],[68],[71] 7.00% [13],[14],[72]   5.00% [16],[31],[68],[71] 5.00% [16],[31],[68],[71]   7.00% [13],[14],[72] 7.00% [13],[14],[72]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     $ 12,734 [13],[14],[72]                      
Fair Value, Ending Balance $ 12,734 [13],[14],[72]   13,664 [16],[68],[71] $ 12,734 [13],[14],[72]                    
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 2 and Tennessee Bidco Limited, First lien 5                            
Principal amount or par value     14,457                      
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 3                            
Principal amount or par value $ 10,184 [13],[14],[23]   $ 10,312 [16],[18],[68] $ 10,184 [13],[14],[23]                    
Spread 7.00% [13],[14]   5.00% [16],[31],[68] 7.00% [13],[14]   5.00% [16],[31],[68] 5.00% [16],[31],[68]   7.00% [13],[14] 7.00% [13],[14]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     $ 10,184 [13],[14]                      
Fair Value, Ending Balance $ 10,184 [13],[14]   10,312 [16],[68] $ 10,184 [13],[14]                    
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 4                            
Principal amount or par value $ 6,246 [13],[14],[23]   $ 6,373 [16],[18],[68] $ 6,246 [13],[14],[23]                    
Spread 7.00% [13],[14]   5.00% [16],[31],[68] 7.00% [13],[14]   5.00% [16],[31],[68] 5.00% [16],[31],[68]   7.00% [13],[14] 7.00% [13],[14]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     $ 6,246 [13],[14]                      
Fair Value, Ending Balance $ 6,246 [13],[14]   $ 6,373 [16],[68] $ 6,246 [13],[14]                    
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 5                            
Principal amount or par value | €             € 716 [16],[18],[68],[71]     € 708 [13],[14],[23],[72]        
Spread 7.00% [13],[14],[72]   5.00% [16],[31],[68],[71] 7.00% [13],[14],[72]   5.00% [16],[31],[68],[71] 5.00% [16],[31],[68],[71]   7.00% [13],[14],[72] 7.00% [13],[14],[72]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     $ 757 [13],[14],[72]                      
Fair Value, Ending Balance $ 757 [13],[14],[72]   791 [16],[68],[71] $ 757 [13],[14],[72]                    
Investment, Identifier [Axis]: The Kleinfelder Group, Inc., First lien                            
Principal amount or par value $ 16,533 [13],[23],[25]     $ 16,533 [13],[23],[25]                    
Spread 5.25% [13],[25]     5.25% [13],[25]         5.25% [13],[25] 5.25% [13],[25]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     16,241 [13],[25]                      
Fair Value, Ending Balance $ 16,241 [13],[25]     $ 16,241 [13],[25]                    
Investment, Identifier [Axis]: TigerConnect, Inc. First Lien                            
Principal amount or par value     $ 29,868 [16],[18],[22]                      
Spread     3.38% [16],[22]     3.38% [16],[22] 3.38% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 29,614 [16],[22]                      
Investment, Identifier [Axis]: TigerConnect, Inc. First Lien - Drawn                            
Principal amount or par value     $ 1,354 [16],[18],[20],[21]                      
Spread     3.38% [16],[20],[21]     3.38% [16],[20],[21] 3.38% [16],[20],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 1,343 [16],[20],[21]                      
Investment, Identifier [Axis]: TigerConnect, Inc., First lien                            
Principal amount or par value $ 29,868 [13],[23],[26]     $ 29,868 [13],[23],[26]                    
Spread 3.63% [13],[26],[28]     3.63% [13],[26],[28]         3.63% [13],[26],[28] 3.63% [13],[26],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     29,151 [13],[26]                      
Fair Value, Ending Balance $ 29,151 [13],[26]     $ 29,151 [13],[26]                    
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Drawn                            
Principal amount or par value $ 277 [13],[23],[24],[27]     $ 277 [13],[23],[24],[27]                    
Spread 3.63% [13],[24],[27],[28]     3.63% [13],[24],[27],[28]         3.63% [13],[24],[27],[28] 3.63% [13],[24],[27],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     270 [13],[24],[27]                      
Fair Value, Ending Balance $ 270 [13],[24],[27]     $ 270 [13],[24],[27]                    
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 1                            
Principal amount or par value 955 [13],[14],[23],[24]   885 [18] 955 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (23) [13],[14],[24]                      
Fair Value, Ending Balance (23) [13],[14],[24]   (8) (23) [13],[14],[24]                    
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 2                            
Principal amount or par value 4,267 [13],[14],[23],[24]   4,267 [16],[17],[18],[20] 4,267 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (102) [13],[14],[24]                      
Fair Value, Ending Balance (102) [13],[14],[24]   (36) [16],[17],[20] (102) [13],[14],[24]                    
Investment, Identifier [Axis]: Transcendia Holdings, Inc. Second Lien                            
Principal amount or par value     $ 14,500 [16],[18],[22]                      
Spread     8.00% [16],[22],[30]     8.00% [16],[22],[30] 8.00% [16],[22],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 7,250 [16],[22]                      
Investment, Identifier [Axis]: Transcendia Holdings, Inc. Second lien term loan                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     7,250                      
Investment, Identifier [Axis]: Transcendia Holdings, Inc., Second lien                            
Principal amount or par value $ 14,500 [13],[23],[26]     $ 14,500 [13],[23],[26]                    
Spread 8.00% [13],[26]     8.00% [13],[26]         8.00% [13],[26] 8.00% [13],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     12,418 [13],[26]                      
Fair Value, Ending Balance $ 12,418 [13],[26]     $ 12,418 [13],[26]                    
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First Lien - Drawn                            
Principal amount or par value     $ 4,070 [16],[18],[20],[21]                      
Spread     5.75% [16],[20],[21]     5.75% [16],[20],[21] 5.75% [16],[20],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 4,070 [16],[20],[21]                      
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First Lien 1                            
Principal amount or par value     $ 15,382 [16],[18],[21]                      
Spread     5.75% [16],[21]     5.75% [16],[21] 5.75% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 15,382 [16],[21]                      
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien                            
Principal amount or par value $ 15,382 [13],[23],[27]     $ 15,382 [13],[23],[27]                    
Spread 5.25% [13],[27]     5.25% [13],[27]         5.25% [13],[27] 5.25% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     15,257 [13],[27]                      
Fair Value, Ending Balance $ 15,257 [13],[27]     $ 15,257 [13],[27]                    
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Drawn                            
Principal amount or par value $ 2,889 [13],[23],[24],[27]     $ 2,889 [13],[23],[24],[27]                    
Spread 5.25% [13],[24],[27]     5.25% [13],[24],[27]         5.25% [13],[24],[27] 5.25% [13],[24],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     2,865 [13],[24],[27]                      
Fair Value, Ending Balance $ 2,865 [13],[24],[27]     $ 2,865 [13],[24],[27]                    
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Undrawn 1                            
Principal amount or par value 1,501 [13],[14],[23],[24]   1,182 [16],[17],[18],[20] 1,501 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (12) [13],[14],[24]                      
Fair Value, Ending Balance (12) [13],[14],[24]   0 [16],[17],[20] (12) [13],[14],[24]                    
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Undrawn 2                            
Principal amount or par value 2,364 [13],[23],[24],[27]   1,501 [16],[17],[18],[20] 2,364 [13],[23],[24],[27]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (19) [13],[24],[27]                      
Fair Value, Ending Balance (19) [13],[24],[27]   0 [16],[17],[20] (19) [13],[24],[27]                    
Investment, Identifier [Axis]: USRP Holdings, Inc. First Lien 1                            
Principal amount or par value     $ 11,226 [16],[18],[21]                      
Spread     5.75% [16],[21]     5.75% [16],[21] 5.75% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 11,226 [16],[21]                      
Investment, Identifier [Axis]: USRP Holdings, Inc. First Lien 2                            
Principal amount or par value     $ 1,462 [16],[17],[18]                      
Spread     5.75% [16],[17]     5.75% [16],[17] 5.75% [16],[17]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 1,462 [16],[17]                      
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien - Undrawn                            
Principal amount or par value 893 [13],[14],[23],[24]   893 [16],[17],[18],[20] 893 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (29) [13],[14],[24]                      
Fair Value, Ending Balance (29) [13],[14],[24]   0 [16],[17],[20] (29) [13],[14],[24]                    
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien 1                            
Principal amount or par value $ 11,311 [13],[14],[23]     $ 11,311 [13],[14],[23]                    
Spread 5.50% [13],[14]     5.50% [13],[14]         5.50% [13],[14] 5.50% [13],[14]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     10,945 [13],[14]                      
Fair Value, Ending Balance $ 10,945 [13],[14]     $ 10,945 [13],[14]                    
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien 2                            
Principal amount or par value $ 1,473 [13],[14],[23]     $ 1,473 [13],[14],[23]                    
Spread 5.50% [13],[14]     5.50% [13],[14]         5.50% [13],[14] 5.50% [13],[14]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     1,425 [13],[14]                      
Fair Value, Ending Balance $ 1,425 [13],[14]     $ 1,425 [13],[14]                    
Investment, Identifier [Axis]: UniTek Global Services, Inc., First lien 1                            
Principal amount or par value $ 22,367 [13],[23],[27]     $ 22,367 [13],[23],[27]                    
Spread 5.50% [13],[27],[28]     5.50% [13],[27],[28]         5.50% [13],[27],[28] 5.50% [13],[27],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     22,367 [13],[27]                      
Fair Value, Ending Balance $ 22,367 [13],[27]     $ 22,367 [13],[27]                    
Investment, Identifier [Axis]: UniTek Global Services, Inc., First lien 2                            
Principal amount or par value $ 3,949 [13],[23],[27]     $ 3,949 [13],[23],[27]                    
Spread 5.50% [13],[27],[28]     5.50% [13],[27],[28]         5.50% [13],[27],[28] 5.50% [13],[27],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     3,949 [13],[27]                      
Fair Value, Ending Balance $ 3,949 [13],[27]     $ 3,949 [13],[27]                    
Investment, Identifier [Axis]: UniTek Global Services, Inc., Junior preferred shares, Non-accrual status                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     0                      
Investment, Identifier [Axis]: UniTek Global Services, Inc., Ordinary shares 1                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[27]                      
Fair Value, Ending Balance 0 [13],[27]   0 [16],[21] 0 [13],[27]                    
Investment, Identifier [Axis]: UniTek Global Services, Inc., Ordinary shares 2                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[14]                      
Fair Value, Ending Balance 0 [13],[14]   0 [16],[17] 0 [13],[14]                    
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 1                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     11,626 [13],[14],[73]                      
Fair Value, Ending Balance 11,626 [13],[14],[73]   16,348 [16],[17] $ 11,626 [13],[14],[73]                    
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 1 and UniTek Global Services, Inc., Preferred shares 2                            
Preferred equity dividend rate       20.00%                    
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 2                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     7,670 [13],[14],[73]                      
Fair Value, Ending Balance 7,670 [13],[14],[73]   10,119 [16],[17] $ 7,670 [13],[14],[73]                    
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 3                            
Preferred equity dividend rate       19.00%                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     6,491 [13],[14],[32],[74]                      
Fair Value, Ending Balance 6,491 [13],[14],[32],[74]   4,210 [16],[17],[30] $ 6,491 [13],[14],[32],[74]                    
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 4                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[27],[32],[75]                      
Fair Value, Ending Balance 0 [13],[27],[32],[75]   0 [16],[21],[30] $ 0 [13],[27],[32],[75]                    
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 4 and UniTek Global Services, Inc., Preferred shares 5                            
Preferred equity dividend rate       13.50%                    
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 5                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [13],[14],[32],[75]                      
Fair Value, Ending Balance 0 [13],[14],[32],[75]   0 [16],[17],[30] $ 0 [13],[14],[32],[75]                    
Investment, Identifier [Axis]: UniTek Global Services, Inc., Second lien 1                            
Principal amount or par value 11,575 [13],[14],[23]   13,438 [16],[17] 11,575 [13],[14],[23]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     10,384 [13],[14]                      
Fair Value, Ending Balance 10,384 [13],[14]   12,893 [16],[17] 10,384 [13],[14]                    
Investment, Identifier [Axis]: UniTek Global Services, Inc., Second lien 2                            
Principal amount or par value 5,131 [13],[14],[23]   5,957 [16],[17] 5,131 [13],[14],[23]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     4,603 [13],[14]                      
Fair Value, Ending Balance 4,603 [13],[14]   5,713 [16],[17] 4,603 [13],[14]                    
Investment, Identifier [Axis]: UniTek Global Services, Inc., Senior preferred shares, Non-accrual status                            
Principal amount or par value                       $ 19,795    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     4,210                      
Investment, Identifier [Axis]: UniTek Global Services, Inc., Warrants                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     36,680 [13],[14]                      
Fair Value, Ending Balance 36,680 [13],[14]   42,716 [16],[17] 36,680 [13],[14]                    
Investment, Identifier [Axis]: VT Topco, Inc., Second lien 1                            
Principal amount or par value $ 16,183 [13],[23],[27]     $ 16,183 [13],[23],[27]                    
Spread 6.75% [13],[27]     6.75% [13],[27]         6.75% [13],[27] 6.75% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     15,711 [13],[27]                      
Fair Value, Ending Balance $ 15,711 [13],[27]     $ 15,711 [13],[27]                    
Investment, Identifier [Axis]: VT Topco, Inc., Second lien 2                            
Principal amount or par value $ 10,000 [13],[23],[25]     $ 10,000 [13],[23],[25]                    
Spread 6.75% [13],[25]     6.75% [13],[25]         6.75% [13],[25] 6.75% [13],[25]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     9,708 [13],[25]                      
Fair Value, Ending Balance $ 9,708 [13],[25]     $ 9,708 [13],[25]                    
Investment, Identifier [Axis]: Vectra Co., Second lien                            
Principal amount or par value $ 10,788 [13],[23],[26]     $ 10,788 [13],[23],[26]                    
Spread 7.25% [13],[26]     7.25% [13],[26]         7.25% [13],[26] 7.25% [13],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     7,004 [13],[26]                      
Fair Value, Ending Balance $ 7,004 [13],[26]     $ 7,004 [13],[26]                    
Investment, Identifier [Axis]: Virtusa Corporation, Subordinated                            
Principal amount or par value $ 5,000 [14],[23]     $ 5,000 [14],[23]                    
Spread 7.13% [14]     7.13% [14]         7.13% [14] 7.13% [14]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     3,817 [14]                      
Fair Value, Ending Balance $ 3,817 [14]     $ 3,817 [14]                    
Investment, Identifier [Axis]: Virtusa Corporation, Subordinated                            
Principal amount or par value     $ 9,401 [17],[18]                      
Spread     7.13% [17]     7.13% [17] 7.13% [17]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 8,077 [17]                      
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First Lien - Drawn                            
Principal amount or par value     $ 13,336 [16],[18],[20],[21]                      
Spread     5.75% [16],[20],[21]     5.75% [16],[20],[21] 5.75% [16],[20],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 13,336 [16],[20],[21]                      
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First Lien 1                            
Principal amount or par value     $ 18,758 [16],[18],[21]                      
Spread     5.75% [16],[21]     5.75% [16],[21] 5.75% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 18,758 [16],[21]                      
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First Lien 2                            
Principal amount or par value     $ 1,241 [16],[18],[21]                      
Spread     5.75% [16],[21]     5.75% [16],[21] 5.75% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 1,241 [16],[21]                      
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First Lien 3                            
Principal amount or par value     $ 832 [16],[18],[21]                      
Spread     5.75% [16],[21]     5.75% [16],[21] 5.75% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 832 [16],[21]                      
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Drawn                            
Principal amount or par value $ 7,478 [13],[14],[23],[24]     $ 7,478 [13],[14],[23],[24]                    
Spread 6.00% [13],[14],[24]     6.00% [13],[14],[24]         6.00% [13],[14],[24] 6.00% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     7,430 [13],[14],[24]                      
Fair Value, Ending Balance $ 7,430 [13],[14],[24]     $ 7,430 [13],[14],[24]                    
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Undrawn 1                            
Principal amount or par value 2,040 [13],[14],[23],[24]   2,396 [16],[18],[20],[21] 2,040 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (13) [13],[14],[24]                      
Fair Value, Ending Balance (13) [13],[14],[24]   0 [16],[20],[21] (13) [13],[14],[24]                    
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Undrawn 2                            
Principal amount or par value 8,327 [13],[14],[23],[24]   2,040 [16],[17],[18],[20] 8,327 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (53) [13],[14],[24]                      
Fair Value, Ending Balance (53) [13],[14],[24]   0 [16],[17],[20] (53) [13],[14],[24]                    
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 1                            
Principal amount or par value $ 18,949 [13],[23],[27]     $ 18,949 [13],[23],[27]                    
Spread 6.00% [13],[27]     6.00% [13],[27]         6.00% [13],[27] 6.00% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     18,827 [13],[27]                      
Fair Value, Ending Balance $ 18,827 [13],[27]     $ 18,827 [13],[27]                    
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 2                            
Principal amount or par value $ 1,254 [13],[23],[27]     $ 1,254 [13],[23],[27]                    
Spread 6.00% [13],[27]     6.00% [13],[27]         6.00% [13],[27] 6.00% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     1,246 [13],[27]                      
Fair Value, Ending Balance $ 1,246 [13],[27]     $ 1,246 [13],[27]                    
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 3                            
Principal amount or par value $ 841 [13],[23],[27]     $ 841 [13],[23],[27]                    
Spread 6.00% [13],[27]     6.00% [13],[27]         6.00% [13],[27] 6.00% [13],[27]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     835 [13],[27]                      
Fair Value, Ending Balance $ 835 [13],[27]     $ 835 [13],[27]                    
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, Subrdinated                            
Principal amount or par value     3,513 [16],[17],[18]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     3,459 [16],[17]                      
Investment, Identifier [Axis]: Xactly Corporation, First Lien                            
Principal amount or par value     $ 22,500 [16],[18],[19]                      
Spread     7.25% [16],[19]     7.25% [16],[19] 7.25% [16],[19]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 22,500 [16],[19]                      
Investment, Identifier [Axis]: Xactly Corporation, First lien                            
Principal amount or par value $ 19,047 [13],[23],[25]     $ 19,047 [13],[23],[25]                    
Spread 7.25% [13],[25]     7.25% [13],[25]         7.25% [13],[25] 7.25% [13],[25]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     19,047 [13],[25]                      
Fair Value, Ending Balance $ 19,047 [13],[25]     $ 19,047 [13],[25]                    
Investment, Identifier [Axis]: Xactly Corporation, First lien - Drawn                            
Principal amount or par value $ 992 [13],[14],[23],[24]     $ 992 [13],[14],[23],[24]                    
Spread 7.25% [13],[14],[24]     7.25% [13],[14],[24]         7.25% [13],[14],[24] 7.25% [13],[14],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     992 [13],[14],[24]                      
Fair Value, Ending Balance $ 992 [13],[14],[24]     $ 992 [13],[14],[24]                    
Investment, Identifier [Axis]: Xactly Corporation, First lien - Undrawn                            
Principal amount or par value     992 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     0 [16],[17],[20]                      
Investment, Identifier [Axis]: YLG Holdings, Inc. First Lien - Drawn 1                            
Principal amount or par value     $ 1,204 [16],[18],[20],[39]                      
Spread     5.00% [16],[20],[39]     5.00% [16],[20],[39] 5.00% [16],[20],[39]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 1,204 [16],[20],[39]                      
Investment, Identifier [Axis]: YLG Holdings, Inc. First Lien - Drawn 2                            
Principal amount or par value     $ 80 [16],[18],[20],[39]                      
Spread     5.50% [16],[20],[39]     5.50% [16],[20],[39] 5.50% [16],[20],[39]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 80 [16],[20],[39]                      
Investment, Identifier [Axis]: YLG Holdings, Inc. First Lien 1                            
Principal amount or par value     $ 17,677 [16],[18],[39]                      
Spread     5.00% [16],[39]     5.00% [16],[39] 5.00% [16],[39]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 17,676 [16],[39]                      
Investment, Identifier [Axis]: YLG Holdings, Inc. First Lien 2                            
Principal amount or par value     $ 2,302 [16],[18],[39]                      
Spread     5.00% [16],[39]     5.00% [16],[39] 5.00% [16],[39]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 2,301 [16],[39]                      
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Drawn                            
Principal amount or par value $ 495 [13],[23],[24],[40]     $ 495 [13],[23],[24],[40]                    
Spread 5.00% [13],[24],[40]     5.00% [13],[24],[40]         5.00% [13],[24],[40] 5.00% [13],[24],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     482 [13],[24],[40]                      
Fair Value, Ending Balance $ 482 [13],[24],[40]     $ 482 [13],[24],[40]                    
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn                            
Principal amount or par value 1,584 [13],[14],[23],[24]     1,584 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (41) [13],[14],[24]                      
Fair Value, Ending Balance (41) [13],[14],[24]     (41) [13],[14],[24]                    
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn 1                            
Principal amount or par value     785 [16],[18],[20],[39]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     0 [16],[20],[39]                      
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn 2                            
Principal amount or par value     3,968 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     0 [16],[17],[20]                      
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien 1                            
Principal amount or par value $ 17,861 [13],[23],[40]     $ 17,861 [13],[23],[40]                    
Spread 5.00% [13],[40]     5.00% [13],[40]         5.00% [13],[40] 5.00% [13],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     17,393 [13],[40]                      
Fair Value, Ending Balance $ 17,393 [13],[40]     $ 17,393 [13],[40]                    
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien 2                            
Principal amount or par value $ 2,326 [13],[23],[40]     $ 2,326 [13],[23],[40]                    
Spread 5.00% [13],[40]     5.00% [13],[40]         5.00% [13],[40] 5.00% [13],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     2,265 [13],[40]                      
Fair Value, Ending Balance $ 2,265 [13],[40]     $ 2,265 [13],[40]                    
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien) - Undrawn                            
Principal amount or par value 3,968 [13],[14],[23],[24]     3,968 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (104) [13],[14],[24]                      
Fair Value, Ending Balance (104) [13],[14],[24]     (104) [13],[14],[24]                    
Investment, Identifier [Axis]: iCIMS, Inc. First Lien - Drawn                            
Principal amount or par value     $ 471 [16],[17],[18],[20]                      
Spread     6.75% [16],[17],[20]     6.75% [16],[17],[20] 6.75% [16],[17],[20]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 471 [16],[17],[20]                      
Investment, Identifier [Axis]: iCIMS, Inc. First Lien 1                            
Principal amount or par value     $ 30,783 [16],[18],[22]                      
Spread     3.38% [16],[22]     3.38% [16],[22] 3.38% [16],[22]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 31,008 [16],[22]                      
Investment, Identifier [Axis]: iCIMS, Inc. First Lien 2                            
Principal amount or par value     $ 7,366 [16],[18],[21]                      
Spread     7.25% [16],[21]     7.25% [16],[21] 7.25% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 7,440 [16],[21]                      
Investment, Identifier [Axis]: iCIMS, Inc. First Lien 3                            
Principal amount or par value     $ 4,772 [16],[18],[21]                      
Spread     3.38% [16],[21]     3.38% [16],[21] 3.38% [16],[21]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     $ 4,807 [16],[21]                      
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn 1                            
Principal amount or par value 11,763 [14],[23],[24],[26]   6,293 [16],[18],[20],[22] 11,763 [14],[23],[24],[26]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     0 [14],[24],[26]                      
Fair Value, Ending Balance 0 [14],[24],[26]   0 [16],[20],[22] 0 [14],[24],[26]                    
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn 2                            
Principal amount or par value 4,218 [13],[14],[23],[24]   976 [16],[18],[20],[21] 4,218 [13],[14],[23],[24]                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     (37) [13],[14],[24]                      
Fair Value, Ending Balance (37) [13],[14],[24]   0 [16],[20],[21] (37) [13],[14],[24]                    
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn 3                            
Principal amount or par value     2,347 [16],[17],[18],[20]                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Ending Balance     0 [16],[17],[20]                      
Investment, Identifier [Axis]: iCIMS, Inc., First lien 1                            
Principal amount or par value $ 44,287 [13],[23],[26]     $ 44,287 [13],[23],[26]                    
Spread 3.38% [13],[26],[28]     3.38% [13],[26],[28]         3.38% [13],[26],[28] 3.38% [13],[26],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     43,901 [13],[26]                      
Fair Value, Ending Balance $ 43,901 [13],[26]     $ 43,901 [13],[26]                    
Investment, Identifier [Axis]: iCIMS, Inc., First lien 2                            
Principal amount or par value $ 7,366 [16],[21],[23]     $ 7,366 [16],[21],[23]                    
Spread 7.25% [16],[21]     7.25% [16],[21]         7.25% [16],[21] 7.25% [16],[21]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, Beginning Balance     $ 7,311 [16],[21]                      
Fair Value, Ending Balance $ 7,311 [16],[21]     $ 7,311 [16],[21]                    
[1] New Mountain Finance Corporation (the "Company") generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). These investments are generally subject to certain limitations on resale, and may be deemed to be "restricted securities" under the Securities Act.
[2] New Mountain Finance Corporation (the "Company") generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). These investments are generally subject to certain limitations on resale, and may be deemed to be "restricted securities" under the Securities Act.
[3] Denotes investments in which the Company is an “Affiliated Person”, as defined in the Investment Company Act of 1940, as amended (the "1940 Act"), due to owning or holding the power to vote 5.0% or more of the outstanding voting securities of the investment but not controlling the company. Fair value as of December 31, 2022 and December 31, 2021 along with transactions during the year ended December 31, 2022 in which the issuer was a non-controlled/affiliated investment is as follows:
Portfolio CompanyFair Value at December 31, 2021Gross
Additions (A)		Gross
Redemptions
(B)		Net Change In Unrealized Appreciation (Depreciation)Fair Value at December 31, 2022Net Realized Gains (Losses)Interest
Income		Dividend
Income		Other
Income
Permian Holdco 3, Inc. / Permian Trust$— $— $— $— $— $— $— $— $— 
Sierra Hamilton Holdings Corporation4,000 — — — 4,000 — — — — 
TVG-Edmentum Holdings, LLC / Edmentum Ultimate Holdings, LLC130,775 5,168 — (9,156)126,787 — 2,105 4,109 250 
Total Non-Controlled/Affiliated Investments$134,775 $5,168 $— $(9,156)$130,787 $— $2,105 $4,109 $250 
(A)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, payment-in-kind (“PIK”) interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement at fair value of an existing portfolio company into this category from a different category.
(B)Gross reductions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[4] Gross additions include increases in the cost basis of investments resulting from new portfolio investments, payment-in-kind (“PIK”) interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
[5] Gross additions include increases in the cost basis of investments resulting from new portfolio investments, payment-in-kind (“PIK”) interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement at fair value of an existing portfolio company into this category from a different category.
[6] Gross reductions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[7] Gross reductions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[8] Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
[9] Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
[10] Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[11] Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[12] The Company holds ordinary shares in AAC Lender Holdings, LLC and a first lien term loan, first lien revolver and subordinated notes in American Achievement Corporation, a partially-owned subsidiary of AAC Lender Holdings, LLC.
[13] The fair value of the Company's investment is determined using unobservable inputs that are significant to the overall fair value measurement. See Note 4. Fair Value, for details.
[14] Investment is pledged as collateral for the NMFC Credit Facility, a revolving credit facility among the Company as the Borrower and Goldman Sachs Bank USA as the Administrative Agent and the Collateral Agent and Goldman Sachs Bank USA, Morgan Stanley Bank, N.A., Stifel Bank & Trust and MUFG Union Bank, N.A. as Lenders. See Note 7. Borrowings, for details.
[15] The Company holds ordinary shares in AAC Lender Holdings, LLC and two first lien term loans, a first lien revolver and subordinated notes in American Achievement Corporation, a partially-owned subsidiary of AAC Lender Holdings, LLC.
[16] The fair value of the Company's investment is determined using unobservable inputs that are significant to the overall fair value measurement. See Note 4. Fair Value, for details.
[17] Investment is pledged as collateral for the NMFC Credit Facility, a revolving credit facility among the Company as the Borrower and Goldman Sachs Bank USA as the Administrative Agent and the Collateral Agent and Goldman Sachs Bank USA, Morgan Stanley Bank, N.A., Stifel Bank & Trust and MUFG Union Bank, N.A. as Lenders. See Note 7. Borrowings, for details.
[18] Par amount is denominated in United States Dollar unless otherwise noted, which may include British Pound ("£") and/or Euro ("€").
[19] Investment is held by New Mountain Finance SBIC, L.P.
[20] Par value amounts represent the drawn or undrawn (as indicated in type of investment) portion of revolving credit facilities or delayed draws. Cost amounts represent the cash received at settlement date net of the impact of paydowns and cash paid for drawn revolvers or delayed draws.
[21] Investment is pledged as collateral for the Holdings Credit Facility, a revolving credit facility among the Company, as the Collateral Manager, New Mountain Finance Holdings, L.L.C. ("NMF Holdings") as the Borrower, Wells Fargo Securities, LLC, as the Administrative Agent and Wells Fargo Bank, National Association, as the Lender and Collateral Custodian. See Note 7. Borrowings, for details.
[22] Investment is pledged as collateral for the DB Credit Facility, a revolving credit facility among New Mountain Finance DB, L.L.C. as the Borrower and Deutsche Bank AG, New York Branch as the Facility Agent. See Note 7. Borrowings, for details.
[23] Par amount is denominated in United States Dollar unless otherwise noted, British Pound ("£") and/or Euro ("€").
[24] Par value amounts represent the drawn or undrawn (as indicated in type of investment) portion of revolving credit facilities or delayed draws. Cost amounts represent the cash received at settlement date net of the impact of paydowns and cash paid for drawn revolvers or delayed draws.
[25] Investment is held in New Mountain Finance SBIC, L.P.
[26] Investment is pledged as collateral for the DB Credit Facility, a revolving credit facility among New Mountain Finance DB, L.L.C as the Borrower and Deutsche Bank AG, New York Branch as the Facility Agent. See Note 7. Borrowings, for details.
[27] Investment is pledged as collateral for the Holdings Credit Facility, a revolving credit facility among the Company, as the Collateral Manager, New Mountain Finance Holdings, L.L.C. ("NMF Holdings") as the Borrower, Wells Fargo Securities, LLC, as the Administrative Agent and Wells Fargo Bank, National Association, as the Lender and Collateral Custodian. See Note 7. Borrowings, for details.
[28] All or a portion of interest contains PIK interest.
[29] The Company holds investments in ACI Parent Inc. and a wholly-owned subsidiary of ACI Parent Inc. The Company holds a first lien term loan, a first lien delayed draw and a first lien revolver in ACI Group Holdings, Inc. and preferred equity in ACI Parent Inc. The preferred equity in ACI Parent Inc. is entitled to receive cumulative preferential dividends at a rate of 11.75% per annum.
[30] Investment is on non-accrual status. See Note 3. Investments, for details.
[31] All or a portion of interest contains PIK interest.
[32] Investment or a portion of the investment is on non-accrual status. See Note 3. Investments, for details.
[33] Investment is held in NMF Ancora Holdings, Inc.
[34] Investment is held by NMF Ancora Holdings, Inc.
[35] The Company holds investments in two wholly-owned subsidiaries of Appriss Health Holdings, Inc. The company holds a first lien term loan and a first lien revolver in Appriss Health, LLC, and preferred equity in Appriss Health Intermediate Holdings, Inc. The preferred equity is entitled to receive preferential dividends at a rate of 11.00% per annum.
[36] Indicates assets that the Company deems to be “non-qualifying assets” under Section 55(a) of the 1940 Act. Qualifying assets must represent at least 70.0% of the Company’s total assets at the time of acquisition of any additional non-qualifying assets. As of December 31, 2022, 15.3% of the Company’s total assets are represented by investments at fair value that are considered non-qualifying assets.
[37] Indicates assets that the Company deems to be “non-qualifying assets” under Section 55(a) of the 1940 Act. Qualifying assets must represent at least 70.0% of the Company’s total assets at the time of acquisition of any additional non-qualifying assets. As of December 31, 2023, 14.8% of the Company’s total assets are represented by investments at fair value that are considered non-qualifying assets.
[38] The Company holds preferred equity in Bach Special Limited (Bach Preference Limited) that is entitled to receive cumulative preferential dividends at a rate of 12.25% per annum payable in additional shares.
[39] Investment is held by New Mountain Finance SBIC II, L.P.
[40] Investment is held in New Mountain Finance SBIC II, L.P.
[41] The Company holds investments in two wholly-owned subsidiary of Diamond Parent Holdings Corp. The Company holds three first lien term loans and a first lien revolver in Diligent Corporation and preferred equity in Diligent Preferred Issuer Inc. The preferred equity in Diligent Preferred Issuer Inc. is entitled to receive cumulative preferential dividends at a rate 10.50% per annum.
[42] The Company holds ordinary shares in FS WhiteWater Holdings, LLC, and a first lien term loan, a first lien revolver, and two first lien delayed draws in FS WhiteWater Borrower, LLC, a partially-owned subsidiary of FS WhiteWater Holdings, LLC.
[43] The Company holds ordinary shares in FS WhiteWater Holdings, LLC, and a first lien term loan, a first lien revolver, and three first lien delayed draws in FS WhiteWater Borrower, LLC, a partially-owned subsidiary of FS WhiteWater Holdings, LLC.
[44] Investment is held in NMF HB, Inc.
[45] The Company holds preferred equity in HB Wealth Management, LLC that is entitled to receive cumulative preferential dividends at a rate of 4.00% per annum.
[46] Investment is held by NMF HB, Inc.
[47] Investment is held in NMF TRM, LLC.
[48] Investment is held by NMF TRM, LLC.
[49] Investment is held in NMF QID NGL Holdings, Inc.
[50] Investment is held by NMF QID NGL Holdings, Inc.
[51] The Company holds investments in multiple entities of Haven Midstream Holdings LLC. The Company holds 4.6% of the Class B profits interest in QID NGL, LLC (which at closing represented 97% of the ownership in the class B units in QID TRH Holdings, LLC), class A common units of Haven Midstream Holdings LLC., and holds a first lien revolver in Haven Midstream Holdings LLC.
[52] The Company holds preferred equity in Knockout Intermediate Holdings I Inc. and a first lien term loan, a first lien revolver and a first lien delayed draw in Kaseya, Inc., a wholly-owned subsidiary of Knockout Intermediate Holdings I Inc. The preferred equity is entitled to received cumulative preferential dividends at a rate of 11.75% per annum.
[53] The Company holds ordinary shares and warrants in NHME Holdings Corp., as well as a second lien Tranche A Term Loan in National HME, Inc., a wholly-owned subsidiary of NHME Holdings Corp. The second lien Tranche A Term Loan is entitled to receive 20% of the interest earned on the first lien Tranche A Term Loan, which accrues interest at a rate of SOFR + 5.00%, and 20% of the interest earned on the first lien Tranche B Term Loan, which accrues interest at a rate of SOFR + 6.00%.
[54] The Company holds ordinary shares and warrants in NHME Holdings Corp., as well as a Tranche A Term Loan and Tranche B Term Loan in National HME, Inc., a whollyowned subsidiary of NHME Holdings Corp.
[55] Investment is held in New Mountain Net Lease Corporation.
[56] Investment is held by New Mountain Net Lease Corporation.
[57] The Company holds ordinary shares in OA Topco, L.P., and a first lien term loan and a first lien revolver in OA Buyer, Inc., a wholly-owned subsidiary of OA Topco, L.P.
[58] The Company holds ordinary shares in OA Topco, L.P., and two first lien term loans and a first lien revolver in OA Buyer, Inc., a wholly-owned subsidiary of OA Topco, L.P.
[59] Investment is held in NMF OEC, Inc.
[60] Investment is held by NMF OEC, Inc.
[61] The Company holds preferred equity in OEC Holdco, LLC, and two second lien term loans in OEConnection LLC, a wholly-owned subsidiary of OEC Holdco, LLC. The preferred equity is entitled to receive preferential dividends of 11.0% per annum.
[62] The Company holds one security purchased under a collateralized agreement to resell on its Consolidated Statement of Assets and Liabilities with a cost basis of $30,000 and a fair value of $16,539 as of December 31, 2022. See Note 2. Summary of Significant Accounting Policies, for details.
[63] The Company holds one security purchased under a collateralized agreement to resell on its Consolidated Statement of Assets and Liabilities with a cost basis of $30,000 and a fair value of $16,500 as of December 31, 2023. See Note 2. Summary of Significant Accounting Policies, for details.
[64] Investment is held in NMF Permian Holdings, LLC.
[65] Investment is held by NMF Permian Holdings, LLC.
[66] The Company holds ordinary shares in Pioneer Topco I, L.P., and a first lien term loan and a first lien revolver in Pioneer Buyer I, LLC, a wholly-owned subsidiary of Pioneer Topco I, L.P.
[67] Investment is held in NMF Pioneer, Inc.
[68] Investment is held by NMF Pioneer, Inc.
[69] The Company holds ordinary shares in Pioneer Topco I, L.P., and two first lien term loans and a first lien revolver in Pioneer Buyer I, LLC, a wholly-owned subsidiary of Pioneer Topco I, L.P.
[70] The Company holds preferred equity in Project Essential Super Parent, LLC that is entitled to receive cumulative preferential dividends at a rate of L + 9.50% per annum
[71] Investment is denominated in foreign currency and is translated into U.S. dollars as of the valuation date. As of December 31, 2023, the par value U.S. dollar equivalent of the first lien term loan, and drawn first lien term loan is $16,600 and $14,457, respectively. See Note 2. Summary of Significant Accounting Policies, for details.
[72] Investment is denominated in foreign currency and is translated into U.S. dollars as of the valuation date. As of December 31, 2022, the par value U.S. dollar equivalent of the first lien term loan, and drawn first lien term loan is $15,562 and $13,941, respectively. See Note 2. Summary of Significant Accounting Policies, for details.
[73] The Company holds preferred equity in UniTek Global Services, Inc. that is entitled to received cumulative preferential dividends at a rate of 20.0% per annum payable in additional shares.
[74] The Company holds preferred equity in UniTek Global Services, Inc. that is entitled to receive cumulative preferential dividends at a rate of 19.0% per annum payable in additional shares.
[75] The Company holds preferred equity in UniTek Global Services, Inc. that is entitled to receive cumulative preferential dividends at a rate of 13.5% per annum payable in additional shares.