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Consolidated Schedule of Investments (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 199.30% 231.20%
Unfunded commitment   $ 690,256
Fair Value   $ (3,057)
Percentage of portfolio above floor rate 93.70% 93.10%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance $ 9,617,248  
Ending balance $ 9,868,440 $ 9,617,248
Non-controlled/non-affiliated investments    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 199.19% 229.90% [1]
Unfunded commitment $ 985,936  
Fair Value (6,660)  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1] 9,560,664  
Ending balance $ 9,862,650 $ 9,560,664 [1]
Non-controlled/affiliated investments    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.12% 1.36% [1]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1] $ 56,584  
Ending balance 5,790 $ 56,584 [1]
Non-controlled/affiliated investments | Blackstone Donegal Holdings LP    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance 56,584 35,683
Gross Additions 0 3,879
Gross Reductions (44,921) 0
Change in Unrealized Gains (Losses) (14,156) 17,022
Net Realized Gain (Loss) 8,283  
Ending balance 5,790 56,584
Dividend and Interest Income 0 0
Investment, Affiliated Issuer    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance 56,584 35,683
Gross Additions 0 3,879
Gross Reductions (44,921) 0
Change in Unrealized Gains (Losses) (14,156) 17,022
Net Realized Gain (Loss) 8,283  
Ending balance 5,790 56,584
Dividend and Interest Income $ 0 $ 0
Qualifying Assets    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 70.00%  
Non-qualifying Assets    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 11.00% 11.00%
Low | Qualifying Assets    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets   70.00%
Investment, Identifier [Axis]: 123Dentist, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.03% [2],[3],[4],[5],[6],[7] 0.03% [1],[8],[9],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[10],[11] $ 1,220  
Ending balance 1,389 [2],[3],[4],[5],[6],[7] $ 1,220 [1],[8],[9],[10],[11]
Investment, Identifier [Axis]: 123Dentist, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 276 270
Fair Value (68) $ (18)
Investment, Identifier [Axis]: ACI Group Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11],[12]   2.48%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11],[12] $ 103,013  
Ending balance [1],[8],[9],[11],[12]   $ 103,013
Investment, Identifier [Axis]: ACI Group Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[7] 2.31%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[7] $ 114,347  
Investment, Identifier [Axis]: ACI Group Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[7] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[7] $ 1,619  
Investment, Identifier [Axis]: ACI Group Holdings, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 14,182 26,295
Fair Value 0 0
Investment, Identifier [Axis]: ACI Group Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 9,832 10,295
Fair Value 0 $ 0
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[9],[11],[13]   0.20%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[13] $ 8,419  
Ending balance [1],[9],[11],[13]   $ 8,419
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[14] 0.14%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[14] $ 6,849  
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[6],[14] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[6],[14] $ 1,615  
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   468
Fair Value   0
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 1,301 1,301
Fair Value $ (26) $ (26)
Investment, Identifier [Axis]: AGI Group Holdings LP - A2 Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [5] 0.02% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 724  
Ending balance 507 [5] $ 724 [1],[11]
Investment, Identifier [Axis]: AGI-CFI Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[11]   2.29%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11] $ 95,431  
Ending balance [1],[8],[11]   $ 95,431
Investment, Identifier [Axis]: AGI-CFI Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[7] 1.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[7] $ 74,470  
Investment, Identifier [Axis]: AGI-CFI Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[7] 0.36%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[7] $ 17,847  
Investment, Identifier [Axis]: AI Altius Bidco, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [3],[5],[6],[15] 0.13% [1],[8],[9],[11],[12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11],[12] $ 5,300  
Ending balance $ 960 [3],[5],[6],[15] $ 5,300 [1],[8],[9],[11],[12]
Investment, Identifier [Axis]: AI Altius Bidco, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.13% [2],[5],[6],[7] 0.02% [1],[11],[12],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[12],[16] $ 808  
Ending balance 6,612 [2],[5],[6],[7] $ 808 [1],[11],[12],[16]
Investment, Identifier [Axis]: AI Altius Bidco, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 158 1,446
Fair Value $ 0 $ (14)
Investment, Identifier [Axis]: ALKU, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[5],[6],[7] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[5],[6],[7] $ 796  
Investment, Identifier [Axis]: ALKU, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[11]   1.80%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11] 74,904  
Ending balance [1],[8],[11]   $ 74,904
Investment, Identifier [Axis]: ALKU, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[11]   0.92%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11] $ 38,118  
Ending balance [1],[8],[11]   $ 38,118
Investment, Identifier [Axis]: ASP Endeavor Acquisition, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.25% [3],[5],[17] 0.31% [1],[11],[12],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[12],[18] $ 13,042  
Ending balance $ 12,467 [3],[5],[17] $ 13,042 [1],[11],[12],[18]
Investment, Identifier [Axis]: AVE Holdings I Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [5] 0.02% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 638  
Ending balance $ 596 [5] $ 638 [1],[11]
Investment, Identifier [Axis]: Abaco Energy Technologies, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.35% [5],[19] 0.88% [1],[11],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[20] $ 36,437  
Ending balance 17,563 [5],[19] $ 36,437 [1],[11],[20]
Investment, Identifier [Axis]: Albireo Energy, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[11],[12],[13]   2.45%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[12],[13] $ 101,953  
Ending balance [1],[11],[12],[13]   $ 101,953
Investment, Identifier [Axis]: Albireo Energy, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[5],[14] 1.43%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[5],[14] $ 70,722  
Investment, Identifier [Axis]: Albireo Energy, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[5],[14] 0.12%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[5],[14] $ 5,726  
Investment, Identifier [Axis]: Albireo Energy, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[5],[14] 0.43%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[5],[14] $ 21,227  
Investment, Identifier [Axis]: Alera Group, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.07% [2],[5],[6],[7] 0.09% [1],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 3,629  
Ending balance 3,659 [2],[5],[6],[7] $ 3,629 [1],[8],[9],[11]
Investment, Identifier [Axis]: Alera Group, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 1,291  
Fair Value $ (6)  
Investment, Identifier [Axis]: Amerilife Holdings LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[7] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[7] $ 2,145  
Investment, Identifier [Axis]: Amerilife Holdings LLC, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitment 75  
Fair Value 0  
Investment, Identifier [Axis]: Amerilife Holdings LLC, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitment 488  
Fair Value (5)  
Investment, Identifier [Axis]: Amerilife Holdings LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 243  
Fair Value 0  
Investment, Identifier [Axis]: Amerilife Holdings, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11]   0.05%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] 2,076  
Ending balance [1],[8],[9],[11]   $ 2,076
Investment, Identifier [Axis]: Amerilife Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   150
Fair Value   0
Investment, Identifier [Axis]: Amerilife Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment   243
Fair Value   $ (2)
Investment, Identifier [Axis]: Amerivet Partners Management, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11],[12]   0.13%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11],[12] $ 5,600  
Ending balance [1],[8],[9],[11],[12]   $ 5,600
Investment, Identifier [Axis]: Amerivet Partners Management, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[7] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[7] $ 1,341  
Investment, Identifier [Axis]: Amerivet Partners Management, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[5],[6],[7] 0.09%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[5],[6],[7] $ 4,259  
Investment, Identifier [Axis]: Amerivet Partners Management, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   2,605
Fair Value   0
Investment, Identifier [Axis]: Amerivet Partners Management, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 589 589
Fair Value $ 0 $ (24)
Investment, Identifier [Axis]: Anaplan, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.04% [2],[3],[5],[6],[7] 0.04% [1],[8],[9],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[10],[11] $ 1,747  
Ending balance 1,794 [2],[3],[5],[6],[7] $ 1,747 [1],[8],[9],[10],[11]
Investment, Identifier [Axis]: Anaplan, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 161 179
Fair Value $ (1) $ (21)
Investment, Identifier [Axis]: Apex Companies, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[14] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[14] $ 1,600  
Investment, Identifier [Axis]: Apex Companies, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 369  
Fair Value (5)  
Investment, Identifier [Axis]: Armada Parent, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11]   0.61%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 25,209  
Ending balance [1],[8],[9],[11]   $ 25,209
Investment, Identifier [Axis]: Armada Parent, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[6],[7] 0.51%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[6],[7] $ 25,435  
Investment, Identifier [Axis]: Armada Parent, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 1,250 1,250
Fair Value 0 0
Investment, Identifier [Axis]: Armada Parent, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 3,000 3,000
Fair Value $ (30) $ (83)
Investment, Identifier [Axis]: Ascend Buyer, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.37% [5],[7] 0.45% [1],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 18,678  
Ending balance $ 18,415 [5],[7] $ 18,678 [1],[8],[9],[11]
Investment, Identifier [Axis]: Ascend Buyer, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.04% [5],[7] 0.05% [1],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11] $ 1,975  
Ending balance $ 1,945 [5],[7] $ 1,975 [1],[8],[11]
Investment, Identifier [Axis]: Ascend Buyer, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[7] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[7] $ 624  
Investment, Identifier [Axis]: Ascend Buyer, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 1,293 1,940
Fair Value 0 $ (19)
Investment, Identifier [Axis]: AxiomSL Group, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[9],[11],[13]   1.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[13] $ 41,635  
Ending balance [1],[9],[11],[13]   $ 41,635
Investment, Identifier [Axis]: AxiomSL Group, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   2,949
Fair Value   (29)
Investment, Identifier [Axis]: AxiomSL Group, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment   3,221
Fair Value   $ (32)
Investment, Identifier [Axis]: BP Purchaser, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.14% [5],[7] 0.17% [1],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11] $ 7,094  
Ending balance $ 6,968 [5],[7] $ 7,094 [1],[8],[11]
Investment, Identifier [Axis]: BPPH2 Limited    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.67% [3],[4],[5],[15] 0.76% [1],[10],[11],[12],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[10],[11],[12],[16] $ 31,794  
Ending balance $ 33,272 [3],[4],[5],[15] $ 31,794 [1],[10],[11],[12],[16]
Investment, Identifier [Axis]: Bamboo US BidCo LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[4],[5],[6],[14] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[4],[5],[6],[14] $ 667  
Investment, Identifier [Axis]: Bamboo US BidCo LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[14] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[4],[5],[6],[14] $ 373  
Investment, Identifier [Axis]: Bamboo US BidCo LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 99  
Fair Value 0  
Investment, Identifier [Axis]: Bamboo US BidCo LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 142  
Fair Value (3)  
Investment, Identifier [Axis]: Barbri Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[11]   1.53%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11] $ 63,820  
Ending balance [1],[8],[11]   $ 63,820
Investment, Identifier [Axis]: Barbri Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[7] 1.17%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[7] $ 58,055  
Investment, Identifier [Axis]: Bazaarvoice, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[9],[11],[16]   5.49%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[16] $ 228,477  
Ending balance [1],[9],[11],[16]   $ 228,477
Investment, Identifier [Axis]: Bazaarvoice, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[15] 4.57%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[15] $ 226,169  
Investment, Identifier [Axis]: Bazaarvoice, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[15] 0.31%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[15] $ 15,244  
Investment, Identifier [Axis]: Bazaarvoice, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 28,662 28,662
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Beeline, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[7] 0.10%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[7] $ 4,939  
Investment, Identifier [Axis]: Beeline, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 514  
Fair Value (3)  
Investment, Identifier [Axis]: Beeline, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 591  
Fair Value 0  
Investment, Identifier [Axis]: Benefytt Technologies, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11]   0.26%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] 10,896  
Ending balance [1],[8],[9],[11]   $ 10,896
Investment, Identifier [Axis]: Benefytt Technologies, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   397
Fair Value   $ 0
Investment, Identifier [Axis]: Blackstone Donegal Holdings LP - LP Interests (Westland Insurance Group LTD)    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1]   1.36%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1] $ 56,584  
Ending balance [1]   $ 56,584
Investment, Identifier [Axis]: Blackstone Donegal Holdings LP - LP Interests (Westland Insurance Group LTD)    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [4],[5],[21] 0.12%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [4],[5],[21] $ 5,790  
Investment, Identifier [Axis]: BlueCat Networks USA, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[10],[11]   0.05%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[10],[11] $ 1,913  
Ending balance [1],[8],[9],[10],[11]   $ 1,913
Investment, Identifier [Axis]: BlueCat Networks USA, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[5],[6],[7] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[5],[6],[7] $ 1,913  
Investment, Identifier [Axis]: BlueCat Networks USA, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[5],[6],[7] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[5],[6],[7] $ 336  
Investment, Identifier [Axis]: BlueCat Networks USA, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[7] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[7] $ 61  
Investment, Identifier [Axis]: BlueCat Networks USA, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 277  
Fair Value $ 0  
Investment, Identifier [Axis]: BlueCat Networks USA, Inc., Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitment   309
Fair Value   0
Investment, Identifier [Axis]: BlueCat Networks USA, Inc., Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitment   341
Fair Value   $ (3)
Investment, Identifier [Axis]: Bluefin Holding, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[4],[5],[6],[14] 0.45%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[4],[5],[6],[14] $ 22,381  
Investment, Identifier [Axis]: Bluefin Holding, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 2,244  
Fair Value (34)  
Investment, Identifier [Axis]: Box Co-Invest Blocker, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[11]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 625  
Ending balance [1],[11]   $ 625
Investment, Identifier [Axis]: Box Co-Invest Blocker, LLC - Class A Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5] $ 358  
Investment, Identifier [Axis]: Box Co-Invest Blocker, LLC - Class C Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5] $ 92  
Investment, Identifier [Axis]: BradyIFS Holdings, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[14] 1.81%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[14] $ 89,599  
Investment, Identifier [Axis]: BradyIFS Holdings, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[14] 0.05%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[14] $ 2,372  
Investment, Identifier [Axis]: BradyIFS Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 7,613  
Fair Value 0  
Investment, Identifier [Axis]: BradyIFS Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 7,758  
Fair Value $ (155)  
Investment, Identifier [Axis]: Brave Parent Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [6] 1.28%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [6] $ 63,346  
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 7,282  
Fair Value (55)  
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 3,641  
Fair Value $ (36)  
Investment, Identifier [Axis]: Bution Holdco 2, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.42% [5],[14] 1.75% [1],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] $ 72,809  
Ending balance $ 70,143 [5],[14] $ 72,809 [1],[11],[13]
Investment, Identifier [Axis]: CCBlue Bidco, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.18% [5],[6],[7] 0.24% [1],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 9,853  
Ending balance $ 9,046 [5],[6],[7] $ 9,853 [1],[8],[9],[11]
Investment, Identifier [Axis]: CCBlue Bidco, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   1,408
Fair Value   $ 0
Investment, Identifier [Axis]: CFCo LLC (Benefytt Technologies, Inc.)    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[15],[22],[23] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[15],[22],[23] $ 68  
Investment, Identifier [Axis]: CFCo LLC (Benefytt Technologies, Inc.) - Class B Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5] $ 0  
Investment, Identifier [Axis]: CFGI Holdings, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.14% [2],[5],[6],[7] 0.18% [1],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 7,565  
Ending balance 6,942 [2],[5],[6],[7] $ 7,565 [1],[8],[9],[11]
Investment, Identifier [Axis]: CFGI Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   1,200
Fair Value   (12)
Investment, Identifier [Axis]: CFGI Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 1,050 1,050
Fair Value $ (21) $ (21)
Investment, Identifier [Axis]: CFS Brands, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[4],[5],[14] 2.34%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[4],[5],[14] $ 115,897  
Investment, Identifier [Axis]: CFS Brands, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 12,118  
Fair Value 0  
Investment, Identifier [Axis]: CFS Brands, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 18,177  
Fair Value $ (364)  
Investment, Identifier [Axis]: COP Home Services TopCo IV, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.76% [2],[3],[5],[14] 0.51% [1],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[13] $ 21,233  
Ending balance 37,541 [2],[3],[5],[14] $ 21,233 [1],[9],[11],[13]
Investment, Identifier [Axis]: COP Home Services TopCo IV, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[11],[12],[13]   0.17%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[12],[13] 7,178  
Ending balance [1],[11],[12],[13]   $ 7,178
Investment, Identifier [Axis]: COP Home Services TopCo IV, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 8,730  
Fair Value (131)  
Investment, Identifier [Axis]: COP Home Services TopCo IV, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 3,509 1,941
Fair Value (38) $ (21)
Investment, Identifier [Axis]: CPI Buyer, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11]   0.70%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 29,089  
Ending balance [1],[8],[9],[11]   $ 29,089
Investment, Identifier [Axis]: CPI Buyer, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[6],[7] 0.61%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[6],[7] $ 30,063  
Investment, Identifier [Axis]: CPI Buyer, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   7,778
Fair Value   0
Investment, Identifier [Axis]: CPI Buyer, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 3,214 3,214
Fair Value $ (64) $ (64)
Investment, Identifier [Axis]: CPI Intermediate Holdings Inc    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.08% [2],[3],[5],[7] 0.09% [1],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 3,943  
Ending balance 3,924 [2],[3],[5],[7] $ 3,943 [1],[8],[9],[11]
Investment, Identifier [Axis]: CPI Intermediate Holdings Inc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 966 966
Fair Value $ (10) $ (10)
Investment, Identifier [Axis]: Caerus Midco 2 S.À. R.L - Additional Vehicle Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [5] 0.00% [1],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[10],[11] $ 1  
Ending balance $ 1 [5] $ 1 [1],[10],[11]
Investment, Identifier [Axis]: Caerus Midco 2 S.À. R.L - Vehicle Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [4],[5] 0.00% [1],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[10],[11] $ 53  
Ending balance $ 54 [4],[5] $ 53 [1],[10],[11]
Investment, Identifier [Axis]: Caerus US 1, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.20% [4],[5],[6],[7] 0.25% [1],[8],[9],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[10],[11] $ 10,207  
Ending balance $ 9,788 [4],[5],[6],[7] $ 10,207 [1],[8],[9],[10],[11]
Investment, Identifier [Axis]: Caerus US 1, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.06% [2],[4],[5],[6],[7] 0.05% [1],[8],[9],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[10],[11] $ 2,170  
Ending balance $ 3,163 [2],[4],[5],[6],[7] $ 2,170 [1],[8],[9],[10],[11]
Investment, Identifier [Axis]: Caerus US 1, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[4],[5],[6],[7] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[4],[5],[6],[7] $ 791  
Investment, Identifier [Axis]: Caerus US 1, Inc., Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitment 836 1,506
Fair Value 0 (15)
Investment, Identifier [Axis]: Caerus US 1, Inc., Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitment 178 320
Fair Value 0 0
Investment, Identifier [Axis]: Caerus US 1, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 322  
Fair Value $ 0  
Investment, Identifier [Axis]: Caerus US 1, Inc., Revolver 1    
Schedule of Investments [Line Items]    
Unfunded commitment   732
Fair Value   0
Investment, Identifier [Axis]: Caerus US 1, Inc., Revolver 2    
Schedule of Investments [Line Items]    
Unfunded commitment   233
Fair Value   $ (5)
Investment, Identifier [Axis]: Cambium Holdings, LLC - Senior Preferred Interests    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.32% [5] 0.36% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 15,135  
Ending balance $ 15,955 [5] $ 15,135 [1],[11]
Investment, Identifier [Axis]: Cambium Learning Group, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 5.84% [2],[5],[7] 7.02% [1],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 292,101  
Ending balance 289,143 [2],[5],[7] $ 292,101 [1],[8],[9],[11]
Investment, Identifier [Axis]: Cambium Learning Group, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 43,592 43,592
Fair Value 0 $ 0
Investment, Identifier [Axis]: Canadian Hospital Specialties Ltd.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[9],[10],[11],[12],[13]   0.55%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[10],[11],[12],[13] $ 22,786  
Ending balance [1],[9],[10],[11],[12],[13]   $ 22,786
Investment, Identifier [Axis]: Canadian Hospital Specialties Ltd. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[14] 0.51%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[4],[5],[6],[14] $ 25,356  
Investment, Identifier [Axis]: Canadian Hospital Specialties Ltd. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.05% [3],[4],[5],[6],[7] 0.17% [1],[10],[11],[12],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[10],[11],[12],[16] $ 7,171  
Ending balance $ 2,683 [3],[4],[5],[6],[7] $ 7,171 [1],[10],[11],[12],[16]
Investment, Identifier [Axis]: Canadian Hospital Specialties Ltd. 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[15] 0.14%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[4],[5],[6],[15] $ 7,075  
Investment, Identifier [Axis]: Canadian Hospital Specialties Ltd., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   5,647
Fair Value   0
Investment, Identifier [Axis]: Canadian Hospital Specialties Ltd., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment   1,376
Fair Value   $ 0
Investment, Identifier [Axis]: Capstone Logistics, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.11% [5],[6],[14] 0.13% [1],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] $ 5,350  
Ending balance $ 5,501 [5],[6],[14] $ 5,350 [1],[11],[13]
Investment, Identifier [Axis]: Castle Management Borrower, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[6],[14] 0.46%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[6],[14] $ 22,940  
Investment, Identifier [Axis]: Castle Management Borrower, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 2,917  
Fair Value $ (44)  
Investment, Identifier [Axis]: Circana Group, L.P. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[7] 2.43%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[7] $ 120,332  
Investment, Identifier [Axis]: Circana Group, L.P. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[7] 1.56%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[7] $ 77,153  
Investment, Identifier [Axis]: Circana Group, L.P. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[6],[7] 0.05%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[6],[7] $ 2,484  
Investment, Identifier [Axis]: Circana Group, L.P., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 11,316  
Fair Value $ 0  
Investment, Identifier [Axis]: Clearview Buyer, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.18% [2],[3],[5],[6],[7] 0.22% [1],[8],[9],[11],[12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11],[12] $ 9,001  
Ending balance 8,909 [2],[3],[5],[6],[7] $ 9,001 [1],[8],[9],[11],[12]
Investment, Identifier [Axis]: Clearview Buyer, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 3,668 3,668
Fair Value 0 0
Investment, Identifier [Axis]: Clearview Buyer, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 898 898
Fair Value $ (18) $ (18)
Investment, Identifier [Axis]: Color Intermediate LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.41% [3],[5],[6],[7] 0.48% [1],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11] $ 19,906  
Ending balance $ 20,160 [3],[5],[6],[7] $ 19,906 [1],[8],[11]
Investment, Identifier [Axis]: Community Brands ParentCo, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.10% [2],[3],[5],[6],[7] 0.12% [1],[8],[9],[11],[12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11],[12] $ 4,850  
Ending balance 4,893 [2],[3],[5],[6],[7] $ 4,850 [1],[8],[9],[11],[12]
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 588 588
Fair Value (6) (6)
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 345 345
Fair Value $ (1) $ (7)
Investment, Identifier [Axis]: Confine Visual Bidco    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.28% [2],[4],[5],[6],[7] 0.36% [1],[8],[9],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[10],[11] $ 15,092  
Ending balance 13,936 [2],[4],[5],[6],[7] $ 15,092 [1],[8],[9],[10],[11]
Investment, Identifier [Axis]: Confine Visual Bidco, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 3,043 3,046
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Connatix Buyer, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.39% [2],[3],[5],[6],[7] 0.51% [1],[8],[9],[11],[12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11],[12] $ 21,220  
Ending balance 19,362 [2],[3],[5],[6],[7] $ 21,220 [1],[8],[9],[11],[12]
Investment, Identifier [Axis]: Connatix Buyer, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   10,900
Fair Value   (109)
Investment, Identifier [Axis]: Connatix Buyer, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 5,431 5,431
Fair Value $ (448) $ (109)
Investment, Identifier [Axis]: Connatix Parent, LLC - Class L Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [5] 0.01% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 256  
Ending balance $ 117 [5] $ 256 [1],[11]
Investment, Identifier [Axis]: Corfin Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 3.88% [5],[6],[7] 4.70% [1],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] $ 195,405  
Ending balance $ 192,311 [5],[6],[7] $ 195,405 [1],[11],[13]
Investment, Identifier [Axis]: Corfin Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.34% [5],[6],[14] 1.63% [1],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] $ 67,874  
Ending balance $ 66,500 [5],[6],[14] $ 67,874 [1],[11],[13]
Investment, Identifier [Axis]: Coupa Software Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[4],[5],[6],[7] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[4],[5],[6],[7] $ 1,819  
Investment, Identifier [Axis]: Coupa Software Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 164  
Fair Value (2)  
Investment, Identifier [Axis]: Coupa Software Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 126  
Fair Value $ (1)  
Investment, Identifier [Axis]: Crewline Buyer, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[4],[5],[6],[14] 1.18%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[4],[5],[6],[14] $ 58,282  
Investment, Identifier [Axis]: Crewline Buyer, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 6,438  
Fair Value (156)  
Investment, Identifier [Axis]: Cross Country Healthcare, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[11]   0.16%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11] $ 6,582  
Ending balance [1],[8],[11]   $ 6,582
Investment, Identifier [Axis]: Cumming Group, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.59% [2],[5],[6],[14] 1.71% [1],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[13] $ 71,088  
Ending balance $ 78,670 [2],[5],[6],[14] $ 71,088 [1],[9],[11],[13]
Investment, Identifier [Axis]: Cumming Group, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.19% [2],[5],[6],[14] 0.02% [1],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] $ 970  
Ending balance 9,448 [2],[5],[6],[14] $ 970 [1],[11],[13]
Investment, Identifier [Axis]: Cumming Group, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 8,063 7,896
Fair Value (60) (79)
Investment, Identifier [Axis]: Cumming Group, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 12,695 11,923
Fair Value $ (190) $ 0
Investment, Identifier [Axis]: CustomInk, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 3.30% [5],[6],[14],[23] 3.93% [1],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] $ 163,594  
Ending balance $ 163,594 [5],[6],[14],[23] $ 163,594 [1],[11],[13]
Investment, Identifier [Axis]: CustomInk, LLC - Series A Preferred Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.14% [5] 0.16% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 6,521  
Ending balance 7,171 [5] $ 6,521 [1],[11]
Investment, Identifier [Axis]: DCA Investment Holdings, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11]   0.79%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 32,749  
Ending balance [1],[8],[9],[11]   $ 32,749
Investment, Identifier [Axis]: DCA Investment Holdings, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[7] 0.66%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[7] $ 32,620  
Investment, Identifier [Axis]: DCA Investment Holdings, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[7] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[7] $ 990  
Investment, Identifier [Axis]: DCA Investment Holdings, LLC, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitment   169
Fair Value   0
Investment, Identifier [Axis]: DCA Investment Holdings, LLC, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitment   1,000
Fair Value   $ (15)
Investment, Identifier [Axis]: Dana Kepner Company, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[14] 1.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[14] $ 49,700  
Investment, Identifier [Axis]: Dana Kepner Company, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[11],[13]   1.51%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] 62,975  
Ending balance [1],[11],[13]   $ 62,975
Investment, Identifier [Axis]: Dana Kepner Company, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[11]   0.05%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11] $ 1,985  
Ending balance [1],[8],[11]   $ 1,985
Investment, Identifier [Axis]: Daylight Beta Parent LLC (Benefytt Technologies, Inc.)    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[15] 0.11%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[15] $ 5,419  
Investment, Identifier [Axis]: Denali Bidco Ltd 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[4],[5],[6],[7] 0.06%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[4],[5],[6],[7] $ 2,783  
Investment, Identifier [Axis]: Denali Bidco Ltd 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[15] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[4],[5],[6],[15] $ 1,268  
Investment, Identifier [Axis]: Denali Bidco Ltd, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 1,761  
Fair Value (3)  
Investment, Identifier [Axis]: Deneb Ultimate Topco, LLC - Class A Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[11]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 168  
Ending balance [1],[11]   $ 168
Investment, Identifier [Axis]: Descartes Holdings, Inc    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5] $ 102  
Investment, Identifier [Axis]: Diligent Corporation    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.18% [5],[6],[14] 1.38% [1],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] $ 57,182  
Ending balance 58,350 [5],[6],[14] $ 57,182 [1],[11],[13]
Investment, Identifier [Axis]: Discovery Education, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11]   0.61%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 25,565  
Ending balance [1],[8],[9],[11]   $ 25,565
Investment, Identifier [Axis]: Discovery Education, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[14] 0.07%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[14] $ 3,575  
Investment, Identifier [Axis]: Discovery Education, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[6],[7] 0.64%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[6],[7] $ 31,648  
Investment, Identifier [Axis]: Discovery Education, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   6,773
Fair Value   0
Investment, Identifier [Axis]: Discovery Education, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 2,960 2,960
Fair Value $ (118) $ (104)
Investment, Identifier [Axis]: Doc Generici (Diocle S.p.A.)    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.03% [2],[3],[4],[5],[6],[15] 0.04% [1],[9],[10],[11],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[10],[11],[16] $ 1,688  
Ending balance 1,349 [2],[3],[4],[5],[6],[15] $ 1,688 [1],[9],[10],[11],[16]
Investment, Identifier [Axis]: Doc Generici (Diocle S.p.A.), Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 1,682 1,195
Fair Value $ (591) $ (141)
Investment, Identifier [Axis]: Donuts, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 6.45% [5],[6],[14] 7.68% [1],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] $ 319,245  
Ending balance 319,179 [5],[6],[14] $ 319,245 [1],[11],[13]
Investment, Identifier [Axis]: Dreambox Learning Holding LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[11],[12]   0.16%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11],[12] $ 6,661  
Ending balance [1],[8],[11],[12]   $ 6,661
Investment, Identifier [Axis]: EIS Acquisition Holdings, LP - Class A Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.27% [5] 0.32% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 13,282  
Ending balance $ 13,455 [5] $ 13,282 [1],[11]
Investment, Identifier [Axis]: ENV BIDCO AB, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   260
Fair Value   $ 0
Investment, Identifier [Axis]: ENV Bidco AB 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [4],[5],[6],[7] 0.02% [1],[8],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[10],[11] $ 981  
Ending balance $ 1,001 [4],[5],[6],[7] $ 981 [1],[8],[10],[11]
Investment, Identifier [Axis]: ENV Bidco AB 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [2],[4],[5],[6],[15] 0.03% [1],[9],[10],[11],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[10],[11],[16] $ 1,179  
Ending balance 1,079 [2],[4],[5],[6],[15] $ 1,179 [1],[9],[10],[11],[16]
Investment, Identifier [Axis]: ENV Bidco AB, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 433  
Fair Value $ (153)  
Investment, Identifier [Axis]: Eagle Midstream Canada Finance, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.31% [4],[5],[6],[7] 1.77% [1],[8],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[10],[11] $ 73,529  
Ending balance $ 65,109 [4],[5],[6],[7] $ 73,529 [1],[8],[10],[11]
Investment, Identifier [Axis]: Edifecs, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.27% [5],[6],[7] 0.32% [1],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11] $ 13,449  
Ending balance $ 13,447 [5],[6],[7] $ 13,449 [1],[8],[11]
Investment, Identifier [Axis]: Edifecs, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 4.38% [5],[6],[14] 5.38% [1],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] $ 223,544  
Ending balance $ 216,910 [5],[6],[14] $ 223,544 [1],[11],[13]
Investment, Identifier [Axis]: Emergency Power Holdings, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.93% [2],[3],[5],[14] 1.05% [1],[9],[11],[12],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[12],[13] $ 43,486  
Ending balance 46,064 [2],[3],[5],[14] $ 43,486 [1],[9],[11],[12],[13]
Investment, Identifier [Axis]: Emergency Power Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 16,456 18,700
Fair Value $ (165) $ (187)
Investment, Identifier [Axis]: Endeavor Schools Holdings LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[14] 0.44%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[14] $ 21,796  
Investment, Identifier [Axis]: Endeavor Schools Holdings LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[14] 0.08%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[14] $ 3,944  
Investment, Identifier [Axis]: Endeavor Schools Holdings LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 5,776  
Fair Value $ 0  
Investment, Identifier [Axis]: Episerver, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.18% [2],[3],[5],[6],[14] 0.22% [1],[9],[11],[12],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[12],[13] $ 9,117  
Ending balance 9,081 [2],[3],[5],[6],[14] $ 9,117 [1],[9],[11],[12],[13]
Investment, Identifier [Axis]: Episerver, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 2,064 2,064
Fair Value $ (83) $ (93)
Investment, Identifier [Axis]: Epoch Acquisition, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.48% [5],[6],[14] 0.58% [1],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] $ 24,185  
Ending balance $ 23,934 [5],[6],[14] $ 24,185 [1],[11],[13]
Investment, Identifier [Axis]: Ergomed Plc    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[4],[5],[6],[7] 0.43%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[4],[5],[6],[7] $ 21,260  
Investment, Identifier [Axis]: Ergomed Plc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 46,934  
Fair Value $ 0  
Investment, Identifier [Axis]: Expedition Holdco, LLC - Class A Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [5] 0.00% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 44  
Ending balance $ 40 [5] $ 44 [1],[11]
Investment, Identifier [Axis]: Expedition Holdco, LLC - Class B Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [5] 0.00% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 21  
Ending balance $ 11 [5] $ 21 [1],[11]
Investment, Identifier [Axis]: Experity, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.30% [2],[5],[6],[7] 0.35% [1],[8],[9],[11],[12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11],[12] $ 14,677  
Ending balance 14,664 [2],[5],[6],[7] $ 14,677 [1],[8],[9],[11],[12]
Investment, Identifier [Axis]: Experity, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 1,495 1,495
Fair Value $ (15) $ (30)
Investment, Identifier [Axis]: Fencing Supply Group Acquisition, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.06% [2],[5],[6],[14] 1.25% [1],[11],[12],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[12],[13] $ 52,187  
Ending balance 52,735 [2],[5],[6],[14] $ 52,187 [1],[11],[12],[13]
Investment, Identifier [Axis]: Fencing Supply Group Acquisition, LLC, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitment 1,910  
Fair Value (24)  
Investment, Identifier [Axis]: Fencing Supply Group Acquisition, LLC, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitment 1,637  
Fair Value $ 0  
Investment, Identifier [Axis]: Formulations Parent Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[4],[5],[6],[7] 0.17%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[4],[5],[6],[7] $ 8,386  
Investment, Identifier [Axis]: Formulations Parent Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 1,429  
Fair Value $ (26)  
Investment, Identifier [Axis]: Foundation Risk Partners Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.32% [2],[5],[6],[7] 0.65% [1],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 26,881  
Ending balance 15,880 [2],[5],[6],[7] $ 26,881 [1],[8],[9],[11]
Investment, Identifier [Axis]: Foundation Risk Partners Corp., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 6,920  
Fair Value (69)  
Investment, Identifier [Axis]: Foundation Risk Partners Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 2,382 1,401
Fair Value (36) $ 0
Investment, Identifier [Axis]: Freya Bidco Limited, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitment 257  
Fair Value 0  
Investment, Identifier [Axis]: Freya Bidco Limited, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitment 257  
Fair Value 0  
Investment, Identifier [Axis]: Freya Bidco Limited, Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitment 1,009  
Fair Value 0  
Investment, Identifier [Axis]: Freya Bidco Limited, Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitment 1,107  
Fair Value $ 0  
Investment, Identifier [Axis]: Frontgrade Technologies Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[7] 0.05%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[7] $ 2,370  
Investment, Identifier [Axis]: Frontgrade Technologies Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 516  
Fair Value $ 0  
Investment, Identifier [Axis]: Frontline Road Safety Investments, LLC - Class A Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.08% [5] 0.05% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 1,920  
Ending balance 3,776 [5] $ 1,920 [1],[11]
Investment, Identifier [Axis]: Frontline Road Safety, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[11]   2.04%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11] $ 84,648  
Ending balance [1],[8],[11]   $ 84,648
Investment, Identifier [Axis]: Frontline Road Safety, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[6],[7] 1.77%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[6],[7] $ 87,637  
Investment, Identifier [Axis]: Frontline Road Safety, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[7] 0.22%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[7] $ 10,831  
Investment, Identifier [Axis]: Frontline Road Safety, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 10,996  
Fair Value $ (137)  
Investment, Identifier [Axis]: FusionSite Midco, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[14] 0.51%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[14] $ 25,334  
Investment, Identifier [Axis]: FusionSite Midco, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[14] 0.05%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[14] $ 2,231  
Investment, Identifier [Axis]: FusionSite Midco, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 8,800  
Fair Value 0  
Investment, Identifier [Axis]: FusionSite Midco, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 2,791  
Fair Value (63)  
Investment, Identifier [Axis]: GCX Corporation Buyer, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11],[12]   0.64%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11],[12] $ 26,661  
Ending balance [1],[8],[9],[11],[12]   $ 26,661
Investment, Identifier [Axis]: GCX Corporation Buyer, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[5],[6],[7] 0.43%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[5],[6],[7] $ 21,182  
Investment, Identifier [Axis]: GCX Corporation Buyer, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[5],[6],[7] 0.11%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[5],[6],[7] $ 5,363  
Investment, Identifier [Axis]: GCX Corporation Buyer, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   2,000
Fair Value   $ 0
Investment, Identifier [Axis]: GCX Corporation Group Holdings, L.P. - Class A-2 Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [5] 0.01% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 324  
Ending balance $ 302 [5] $ 324 [1],[11]
Investment, Identifier [Axis]: GI Consilio Parent, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[15] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[15] $ 554  
Investment, Identifier [Axis]: GI Consilio Parent, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 561  
Fair Value 0  
Investment, Identifier [Axis]: GI Ranger Intermediate, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11]   0.38%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 15,725  
Ending balance [1],[8],[9],[11]   $ 15,725
Investment, Identifier [Axis]: GI Ranger Intermediate, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[6],[7] 0.32%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[6],[7] $ 15,726  
Investment, Identifier [Axis]: GI Ranger Intermediate, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[6],[7] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[6],[7] $ 720  
Investment, Identifier [Axis]: GI Ranger Intermediate, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 3,040 3,040
Fair Value 0 0
Investment, Identifier [Axis]: GI Ranger Intermediate, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 480 1,080
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: GTCR Investors LP - A-1 Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5] $ 417  
Investment, Identifier [Axis]: Galway Borrower, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.24% [2],[3],[5],[6],[7] 0.52% [1],[8],[9],[11],[12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11],[12] $ 21,577  
Ending balance 12,032 [2],[3],[5],[6],[7] $ 21,577 [1],[8],[9],[11],[12]
Investment, Identifier [Axis]: Galway Borrower, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   274
Fair Value   0
Investment, Identifier [Axis]: Galway Borrower, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 2,120 2,113
Fair Value $ (32) $ (53)
Investment, Identifier [Axis]: Genuine Cable Group, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 3.31% [5],[7] 4.24% [1],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11] $ 176,389  
Ending balance $ 164,014 [5],[7] $ 176,389 [1],[8],[11]
Investment, Identifier [Axis]: Gigamon Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.15% [2],[5],[6],[7] 0.18% [1],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[13] $ 7,293  
Ending balance 7,308 [2],[5],[6],[7] $ 7,293 [1],[9],[11],[13]
Investment, Identifier [Axis]: Gigamon Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 437 437
Fair Value $ (1) $ (10)
Investment, Identifier [Axis]: Go Car Wash Management Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.44% [5],[14] 0.53% [1],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[13] $ 21,954  
Ending balance $ 21,941 [5],[14] $ 21,954 [1],[9],[11],[13]
Investment, Identifier [Axis]: Go Car Wash Management Corp., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   1,057
Fair Value   $ 0
Investment, Identifier [Axis]: GovernmentJobs.com, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.10% [2],[5],[6],[7] 0.12% [1],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 4,828  
Ending balance 5,156 [2],[5],[6],[7] $ 4,828 [1],[8],[9],[11]
Investment, Identifier [Axis]: GovernmentJobs.com, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   2,144
Fair Value   (21)
Investment, Identifier [Axis]: GovernmentJobs.com, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 677 677
Fair Value (14) $ (14)
Investment, Identifier [Axis]: GraphPAD Software, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[9],[11],[13]   0.63%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[13] $ 26,222  
Ending balance [1],[9],[11],[13]   $ 26,222
Investment, Identifier [Axis]: GraphPAD Software, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[14] 0.27%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[14] $ 13,518  
Investment, Identifier [Axis]: GraphPAD Software, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[14] 0.26%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[14] $ 12,797  
Investment, Identifier [Axis]: GraphPAD Software, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[14] 0.13%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[14] $ 6,429  
Investment, Identifier [Axis]: GraphPAD Software, LLC 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[6],[14] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[6],[14] $ 1,030  
Investment, Identifier [Axis]: GraphPAD Software, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   6,429
Fair Value   (64)
Investment, Identifier [Axis]: GraphPAD Software, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 1,062 2,124
Fair Value $ 0 $ (32)
Investment, Identifier [Axis]: Groundworks, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[14] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[14] $ 802  
Investment, Identifier [Axis]: Groundworks, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 37  
Fair Value 0  
Investment, Identifier [Axis]: Groundworks, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 42  
Fair Value (1)  
Investment, Identifier [Axis]: Gruden Acquisition, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[9],[11],[12],[13]   0.39%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[12],[13] 16,167  
Ending balance [1],[9],[11],[12],[13]   $ 16,167
Investment, Identifier [Axis]: Gruden Acquisition, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   2,100
Fair Value   (26)
Investment, Identifier [Axis]: Gruden Acquisition, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment   3,000
Fair Value   $ (38)
Investment, Identifier [Axis]: Guidehouse Holding Corp. - Preferred Equity    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[11]   0.40%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 16,637  
Ending balance [1],[11]   $ 16,637
Investment, Identifier [Axis]: Guidehouse, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 6.13% [5],[6],[7] 7.67% [1],[8],[11],[12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11],[12] $ 319,027  
Ending balance 303,558 [5],[6],[7] $ 319,027 [1],[8],[11],[12]
Investment, Identifier [Axis]: HIG Orca Acquisition Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[9],[11],[12],[13]   0.56%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[12],[13] $ 23,239  
Ending balance [1],[9],[11],[12],[13]   $ 23,239
Investment, Identifier [Axis]: HIG Orca Acquisition Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[14] 0.39%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[14] $ 19,091  
Investment, Identifier [Axis]: HIG Orca Acquisition Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[14] 0.06%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[14] $ 2,877  
Investment, Identifier [Axis]: HIG Orca Acquisition Holdings, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 3,241 3,390
Fair Value 0 0
Investment, Identifier [Axis]: HIG Orca Acquisition Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 2,961 1,542
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Healthcomp Holding Company, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[15] 0.20%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[15] $ 9,924  
Investment, Identifier [Axis]: Healthcomp Holding Company, LLC - Preferred Interest    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5] $ 985  
Investment, Identifier [Axis]: Healthcomp Holding Company, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[11],[12],[13]   1.83%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[12],[13] $ 76,247  
Ending balance [1],[11],[12],[13]   $ 76,247
Investment, Identifier [Axis]: Healthcomp Holding Company, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.97% [5],[6],[7] 0.77% [1],[9],[11],[12],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[12],[13] $ 32,085  
Ending balance 97,515 [5],[6],[7] $ 32,085 [1],[9],[11],[12],[13]
Investment, Identifier [Axis]: Healthcomp Holding Company, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   23,952
Fair Value   $ 0
Investment, Identifier [Axis]: Helix TS, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11]   1.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 42,083  
Ending balance [1],[8],[9],[11]   $ 42,083
Investment, Identifier [Axis]: Helix TS, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[7] 0.90%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[7] $ 44,672  
Investment, Identifier [Axis]: Helix TS, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[6],[7] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[6],[7] $ 973  
Investment, Identifier [Axis]: Helix TS, LLC, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitment   138
Fair Value   0
Investment, Identifier [Axis]: Helix TS, LLC, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitment   767
Fair Value   $ 0
Investment, Identifier [Axis]: High Street Buyer, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11],[12]   1.47%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11],[12] $ 61,282  
Ending balance [1],[8],[9],[11],[12]   $ 61,282
Investment, Identifier [Axis]: High Street Buyer, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[5],[6],[7] 1.06%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[5],[6],[7] $ 52,366  
Investment, Identifier [Axis]: High Street Buyer, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[7] 0.23%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[7] $ 11,146  
Investment, Identifier [Axis]: High Street Buyer, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 9,396 11,830
Fair Value 0 0
Investment, Identifier [Axis]: High Street Buyer, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 2,254 2,254
Fair Value $ (45) $ (45)
Investment, Identifier [Axis]: IG Investments Holdings, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.93% [2],[3],[5],[6],[7] 1.15% [1],[8],[9],[11],[12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11],[12] $ 47,915  
Ending balance 46,011 [2],[3],[5],[6],[7] $ 47,915 [1],[8],[9],[11],[12]
Investment, Identifier [Axis]: IG Investments Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 3,583 2,150
Fair Value $ (18) 0
Investment, Identifier [Axis]: ISQ Hawkey Holdco, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   90
Fair Value   0
Investment, Identifier [Axis]: ISQ Hawkey Holdco, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment   91
Fair Value   $ (1)
Investment, Identifier [Axis]: ISQ Hawkeye Holdco, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [2],[5],[7] 0.02% [1],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 893  
Ending balance 934 [2],[5],[7] $ 893 [1],[8],[9],[11]
Investment, Identifier [Axis]: ISQ Hawkeye Holdco, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 51  
Fair Value 0  
Investment, Identifier [Axis]: ISQ Hawkeye Holdco, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 91  
Fair Value 0  
Investment, Identifier [Axis]: Icefall Parent Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 3,042  
Fair Value 0  
Investment, Identifier [Axis]: Icefall Parent Inc, Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 31,940  
Fair Value $ 0  
Investment, Identifier [Axis]: Infostretch Corporation    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.09% [3],[5],[6],[7] 0.11% [1],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11] $ 4,776  
Ending balance 4,408 [3],[5],[6],[7] $ 4,776 [1],[8],[11]
Investment, Identifier [Axis]: Inova Pharmaceutical, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 102  
Fair Value 0  
Investment, Identifier [Axis]: Inova Pharmaceutical, Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 661  
Fair Value $ 0  
Investment, Identifier [Axis]: Inovalon Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 2.21% [2],[5],[6],[7] 2.52% [1],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 104,979  
Ending balance $ 109,329 [2],[5],[6],[7] $ 104,979 [1],[8],[9],[11]
Investment, Identifier [Axis]: Inovalon Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.25% [5],[6],[7] 0.25% [1],[8],[11],[12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11],[12] $ 10,359  
Ending balance 12,293 [5],[6],[7] $ 10,359 [1],[8],[11],[12]
Investment, Identifier [Axis]: Inovalon Holdings, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 11,060 11,060
Fair Value (138) $ (138)
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11],[12]   3.39%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11],[12] $ 141,089  
Ending balance [1],[8],[9],[11],[12]   $ 141,089
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[7] 2.79%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[7] $ 138,022  
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[5],[6],[7] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[5],[6],[7] $ 1,862  
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[7] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[7] $ 1,098  
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC 5    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[5],[6],[7] 0.08%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[5],[6],[7] $ 3,998  
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 17,064 347
Fair Value 0 $ 0
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 1,381  
Fair Value $ (14)  
Investment, Identifier [Axis]: Investment One    
Schedule of Investments [Line Items]    
Interest rate, floor   0.00%
Investment, Identifier [Axis]: Investment Five    
Schedule of Investments [Line Items]    
Interest rate, floor 1.25% 1.25%
Investment, Identifier [Axis]: Investment Four    
Schedule of Investments [Line Items]    
Interest rate, floor 1.00% 1.00%
Investment, Identifier [Axis]: Investment One    
Schedule of Investments [Line Items]    
Interest rate, floor 0.00%  
Investment, Identifier [Axis]: Investment Seven    
Schedule of Investments [Line Items]    
Interest rate, floor 2.00% 2.00%
Investment, Identifier [Axis]: Investment Six    
Schedule of Investments [Line Items]    
Interest rate, floor 1.50% 1.50%
Investment, Identifier [Axis]: Investment Three    
Schedule of Investments [Line Items]    
Interest rate, floor 0.75% 0.75%
Investment, Identifier [Axis]: Investment Two    
Schedule of Investments [Line Items]    
Interest rate, floor 0.50% 0.50%
Investment, Identifier [Axis]: Iris Buyer, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[14] 0.51%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[14] $ 25,377  
Investment, Identifier [Axis]: Iris Buyer, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 3,318  
Fair Value 0  
Investment, Identifier [Axis]: Iris Buyer, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 3,673  
Fair Value $ (101)  
Investment, Identifier [Axis]: Italian Motorway Holdings S.à.r.l    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.74% [3],[4],[5],[6],[15] 1.96% [1],[10],[11],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[10],[11],[16] $ 81,376  
Ending balance $ 86,349 [3],[4],[5],[6],[15] $ 81,376 [1],[10],[11],[16]
Investment, Identifier [Axis]: JSS Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 5.72% [5],[7] 6.88% [1],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11] $ 285,912  
Ending balance $ 283,010 [5],[7] $ 285,912 [1],[8],[11]
Investment, Identifier [Axis]: JSS Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.10% [5],[7] 0.12% [1],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11] $ 4,938  
Ending balance 4,888 [5],[7] $ 4,938 [1],[8],[11]
Investment, Identifier [Axis]: Jacuzzi Brands, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[11],[13]   2.28%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] $ 94,817  
Ending balance [1],[11],[13]   $ 94,817
Investment, Identifier [Axis]: Jacuzzi Brands, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[7] 0.21%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[7] $ 10,215  
Investment, Identifier [Axis]: Jacuzzi Brands, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[14] 1.42%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[14] $ 70,275  
Investment, Identifier [Axis]: Java Buyer, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11]   0.12%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 4,815  
Ending balance [1],[8],[9],[11]   $ 4,815
Investment, Identifier [Axis]: Java Buyer, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[7] 0.12%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[7] $ 5,919  
Investment, Identifier [Axis]: Java Buyer, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[7] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[7] $ 353  
Investment, Identifier [Axis]: Java Buyer, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   1,897
Fair Value   $ 0
Investment, Identifier [Axis]: Java Buyer, Inc., Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitment 930  
Fair Value 0  
Investment, Identifier [Axis]: Java Buyer, Inc., Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitment 1,276  
Fair Value $ 0  
Investment, Identifier [Axis]: Jayhawk Buyer, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 2.96% [5],[6],[14] 3.70% [1],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[13] $ 153,720  
Ending balance 146,766 [5],[6],[14] $ 153,720 [1],[9],[11],[13]
Investment, Identifier [Axis]: Jayhawk Buyer, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[11],[13]   0.12%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] $ 5,144  
Ending balance [1],[11],[13]   $ 5,144
Investment, Identifier [Axis]: Jayhawk Buyer, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[14] 0.10%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[14] $ 4,950  
Investment, Identifier [Axis]: Jayhawk Buyer, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   30
Fair Value   $ 0
Investment, Identifier [Axis]: Jayhawk Holdings, LP - A-1 Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [5] 0.02% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 627  
Ending balance $ 172 [5] $ 627 [1],[11]
Investment, Identifier [Axis]: Jayhawk Holdings, LP - A-2 Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [5] 0.01% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 338  
Ending balance 93 [5] $ 338 [1],[11]
Investment, Identifier [Axis]: Jones Deslauriers Insurance Management, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[10],[11],[12]   1.44%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[10],[11],[12] $ 59,917  
Ending balance [1],[8],[10],[11],[12]   $ 59,917
Investment, Identifier [Axis]: KKR Alberta Midstream Finance Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.72% [4],[5],[6],[7] 0.96% [1],[8],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[10],[11] $ 40,002  
Ending balance 35,421 [4],[5],[6],[7] $ 40,002 [1],[8],[10],[11]
Investment, Identifier [Axis]: KPSKY Acquisition, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11]   0.51%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 21,240  
Ending balance [1],[8],[9],[11]   $ 21,240
Investment, Identifier [Axis]: KPSKY Acquisition, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[7],[23] 0.40%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[7],[23] $ 20,014  
Investment, Identifier [Axis]: KPSKY Acquisition, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[7] 0.05%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[7] $ 2,305  
Investment, Identifier [Axis]: KPSKY Acquisition, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   143
Fair Value   $ 0
Investment, Identifier [Axis]: Kaufman Hall & Associates, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.49% [5],[6],[7] 0.58% [1],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 24,131  
Ending balance $ 24,082 [5],[6],[7] $ 24,131 [1],[8],[9],[11]
Investment, Identifier [Axis]: Knowledge Pro Buyer, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.12% [2],[5],[7] 0.14% [1],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 5,858  
Ending balance 6,078 [2],[5],[7] $ 5,858 [1],[8],[9],[11]
Investment, Identifier [Axis]: Knowledge Pro Buyer, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 2,633 1,032
Fair Value 0 (8)
Investment, Identifier [Axis]: Knowledge Pro Buyer, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 784 1,145
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Kwol Acquisition, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[4],[5],[6],[7] 0.13%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[4],[5],[6],[7] $ 6,685  
Investment, Identifier [Axis]: Kwol Acquisition, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 628  
Fair Value $ 0  
Investment, Identifier [Axis]: L&S Mechanical Acquisition, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.24% [3],[5],[6],[7] 0.29% [1],[8],[11],[12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11],[12] $ 11,869  
Ending balance $ 12,006 [3],[5],[6],[7] $ 11,869 [1],[8],[11],[12]
Investment, Identifier [Axis]: LD Lower Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.83% [5],[6],[14] 2.19% [1],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[13] $ 91,072  
Ending balance $ 90,602 [5],[6],[14] $ 91,072 [1],[9],[11],[13]
Investment, Identifier [Axis]: LD Lower Holdings, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   15,684
Fair Value   $ 0
Investment, Identifier [Axis]: Legacy Intermediate, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.14% [5],[6],[7] 0.12% [1],[8],[9],[11],[12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11],[12] $ 5,080  
Ending balance $ 6,766 [5],[6],[7] $ 5,080 [1],[8],[9],[11],[12]
Investment, Identifier [Axis]: Legacy Intermediate, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   2,000
Fair Value   (20)
Investment, Identifier [Axis]: Legacy Intermediate, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment   958
Fair Value   $ (10)
Investment, Identifier [Axis]: Lightbox Intermediate, LP    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.04% [3],[5],[6],[15] 0.05% [1],[11],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[16] $ 1,920  
Ending balance $ 1,886 [3],[5],[6],[15] $ 1,920 [1],[11],[16]
Investment, Identifier [Axis]: Lindstrom, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 2.40% [5],[6],[14] 2.90% [1],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] $ 120,758  
Ending balance $ 119,016 [5],[6],[14] $ 120,758 [1],[11],[13]
Investment, Identifier [Axis]: Linquest Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.19% [3],[5],[6],[7] 0.23% [1],[8],[9],[11],[12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11],[12] $ 9,395  
Ending balance $ 9,592 [3],[5],[6],[7] $ 9,395 [1],[8],[9],[11],[12]
Investment, Identifier [Axis]: Linquest Corp., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   4,975
Fair Value   $ (50)
Investment, Identifier [Axis]: Livingston International, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 2.44% [4],[5],[6],[7] 3.07% [1],[8],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[10],[11] $ 127,563  
Ending balance $ 120,848 [4],[5],[6],[7] $ 127,563 [1],[8],[10],[11]
Investment, Identifier [Axis]: Lobos Parent, Inc. - Series A Preferred Shares    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.04% [5] 0.04% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 1,641  
Ending balance $ 1,819 [5] $ 1,641 [1],[11]
Investment, Identifier [Axis]: Lytx, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.71% [5],[6],[14] 1.95% [1],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] $ 81,076  
Ending balance $ 84,454 [5],[6],[14] $ 81,076 [1],[11],[13]
Investment, Identifier [Axis]: MAG DS Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.56% [6],[14] 1.80% [1],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] $ 74,813  
Ending balance $ 77,290 [6],[14] $ 74,813 [1],[11],[13]
Investment, Identifier [Axis]: MHE Intermediate Holdings 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.05% [2],[3],[5],[6],[14] 0.10% [1],[9],[11],[12],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[12],[13] $ 4,331  
Ending balance $ 2,559 [2],[3],[5],[6],[14] $ 4,331 [1],[9],[11],[12],[13]
Investment, Identifier [Axis]: MHE Intermediate Holdings 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [3],[5],[6],[14] 0.01% [1],[11],[12],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[12],[13] $ 208  
Ending balance 249 [3],[5],[6],[14] $ 208 [1],[11],[12],[13]
Investment, Identifier [Axis]: MHE Intermediate Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 268 230
Fair Value 0 $ 0
Investment, Identifier [Axis]: MPG Parent Holdings LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 2,679  
Fair Value 0  
Investment, Identifier [Axis]: MPG Parent Holdings LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 1,313  
Fair Value 0  
Investment, Identifier [Axis]: MPG Parent Holdings LLC, Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 10,763  
Fair Value $ 0  
Investment, Identifier [Axis]: MRI Software, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.02% [2],[3],[6],[14] 0.63% [1],[9],[12],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[12],[13] $ 26,405  
Ending balance 50,422 [2],[3],[6],[14] $ 26,405 [1],[9],[12],[13]
Investment, Identifier [Axis]: MRI Software, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 40,238  
Fair Value (201)  
Investment, Identifier [Axis]: MRI Software, LLC, Revolver 1    
Schedule of Investments [Line Items]    
Unfunded commitment 1,516 1,516
Fair Value (28) (55)
Investment, Identifier [Axis]: MRI Software, LLC, Revolver 2    
Schedule of Investments [Line Items]    
Unfunded commitment 1,822 4,200
Fair Value (3) $ (347)
Investment, Identifier [Axis]: MRI Software, LLC, Revolver 3    
Schedule of Investments [Line Items]    
Unfunded commitment 4,024  
Fair Value (40)  
Investment, Identifier [Axis]: MRI Software, LLC, Revolver 4    
Schedule of Investments [Line Items]    
Unfunded commitment 3,086  
Fair Value $ (34)  
Investment, Identifier [Axis]: Magnesium BorrowerCo, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.11% [2],[3],[5],[6],[7] 0.10% [1],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11] $ 4,079  
Ending balance $ 5,203 [2],[3],[5],[6],[7] $ 4,079 [1],[8],[11]
Investment, Identifier [Axis]: Magnesium BorrowerCo, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.09% [5],[6],[7] 0.12% [1],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11] $ 5,177  
Ending balance 4,345 [5],[6],[7] $ 5,177 [1],[8],[11]
Investment, Identifier [Axis]: Magnesium BorrowerCo, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 485 485
Fair Value $ (12) $ (12)
Investment, Identifier [Axis]: Magneto Components BuyCo, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[4],[5],[6],[7] 0.65%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[4],[5],[6],[7] $ 32,273  
Investment, Identifier [Axis]: Magneto Components BuyCo, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 6,610  
Fair Value 0  
Investment, Identifier [Axis]: Magneto Components BuyCo, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 5,508  
Fair Value $ (138)  
Investment, Identifier [Axis]: Mandolin Technology Holdings, Inc. - Series A Preferred Shares    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.07% [5] 0.08% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 3,408  
Ending balance 3,568 [5] $ 3,408 [1],[11]
Investment, Identifier [Axis]: Mandolin Technology Intermediate Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[9],[11],[12],[18]   0.22%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[12],[18] $ 9,120  
Ending balance [1],[9],[11],[12],[18]   $ 9,120
Investment, Identifier [Axis]: Mandolin Technology Intermediate Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[5],[6],[17] 0.16%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[5],[6],[17] $ 7,887  
Investment, Identifier [Axis]: Mandolin Technology Intermediate Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.14% [3],[5],[6],[17] 0.08% [1],[11],[12],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[12],[18] $ 3,426  
Ending balance $ 6,965 [3],[5],[6],[17] $ 3,426 [1],[11],[12],[18]
Investment, Identifier [Axis]: Mandolin Technology Intermediate Holdings, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[15] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[15] $ 194  
Investment, Identifier [Axis]: Mandolin Technology Intermediate Holdings, Inc. 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[17] 0.07%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[17] $ 3,319  
Investment, Identifier [Axis]: Mandolin Technology Intermediate Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 916 349
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Marcone Yellowstone Buyer, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.09% [3],[5],[7] 0.04% [1],[8],[9],[11],[12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11],[12] $ 1,524  
Ending balance $ 4,606 [3],[5],[7] $ 1,524 [1],[8],[9],[11],[12]
Investment, Identifier [Axis]: Marcone Yellowstone Buyer, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.03% [2],[3],[5],[7] 0.11% [1],[8],[11],[12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11],[12] $ 4,752  
Ending balance $ 1,471 [2],[3],[5],[7] $ 4,752 [1],[8],[11],[12]
Investment, Identifier [Axis]: Marcone Yellowstone Buyer, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.03% [3],[5],[7] 0.04% [1],[8],[11],[12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11],[12] $ 1,534  
Ending balance 1,483 [3],[5],[7] $ 1,534 [1],[8],[11],[12]
Investment, Identifier [Axis]: Marcone Yellowstone Buyer, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 342 342
Fair Value $ (17) $ 0
Investment, Identifier [Axis]: Material Holdings, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.45% [2],[3],[5],[6],[7] 0.57% [1],[8],[9],[11],[12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11],[12] $ 23,687  
Ending balance 22,431 [2],[3],[5],[6],[7] $ 23,687 [1],[8],[9],[11],[12]
Investment, Identifier [Axis]: Material Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   1,802
Fair Value   0
Investment, Identifier [Axis]: Material Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 848 918
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Maverick Acquisition, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.28% [5],[6],[14] 0.41% [1],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] $ 17,004  
Ending balance 13,763 [5],[6],[14] $ 17,004 [1],[11],[13]
Investment, Identifier [Axis]: Medallia, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[11]   8.26%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 343,665  
Ending balance [1],[11]   $ 343,665
Investment, Identifier [Axis]: Medallia, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[7] 7.21%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[7] $ 356,796  
Investment, Identifier [Axis]: Medallia, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[7] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[7] $ 2,094  
Investment, Identifier [Axis]: Mercury Bidco Globe Limited, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 14,992  
Fair Value 0  
Investment, Identifier [Axis]: Mercury Bidco Globe Limited, Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 59,287  
Fair Value $ 0  
Investment, Identifier [Axis]: Micross Topco, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.09% [5] 0.11% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 4,767  
Ending balance $ 4,699 [5] $ 4,767 [1],[11]
Investment, Identifier [Axis]: Mimecast Limited    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [5] 0.02% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 638  
Ending balance $ 674 [5] $ 638 [1],[11]
Investment, Identifier [Axis]: Minotaur Acquisition, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.04% [3],[6],[15] 0.05% [1],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[16] $ 1,903  
Ending balance $ 1,967 [3],[6],[15] $ 1,903 [1],[16]
Investment, Identifier [Axis]: Mode Holdings, L.P. - Class A-2 Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.20% [5] 0.26% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 10,699  
Ending balance $ 9,822 [5] $ 10,699 [1],[11]
Investment, Identifier [Axis]: Mode Purchaser, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 2.89% [5],[6],[14] 4.17% [1],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] $ 173,421  
Ending balance $ 143,110 [5],[6],[14] $ 173,421 [1],[11],[13]
Investment, Identifier [Axis]: Mode Purchaser, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.08% [5],[6],[14] 0.12% [1],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] $ 4,950  
Ending balance 4,085 [5],[6],[14] $ 4,950 [1],[11],[13]
Investment, Identifier [Axis]: Monk Holding Co.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11]   0.12%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 4,929  
Ending balance [1],[8],[9],[11]   $ 4,929
Investment, Identifier [Axis]: Monk Holding Co. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[7],[23] 0.10%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[7],[23] $ 4,804  
Investment, Identifier [Axis]: Monk Holding Co. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[6],[7] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[6],[7] $ 175  
Investment, Identifier [Axis]: Monk Holding Co., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 830 2,038
Fair Value 0 $ 0
Investment, Identifier [Axis]: Monterey Financing S.à.r.l 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[9],[10],[11],[16]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[10],[11],[16] 704  
Ending balance [1],[9],[10],[11],[16]   $ 704
Investment, Identifier [Axis]: Monterey Financing S.à.r.l 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[10],[11],[16]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[10],[11],[16] 674  
Ending balance [1],[10],[11],[16]   $ 674
Investment, Identifier [Axis]: Monterey Financing S.à.r.l 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[10],[11],[18]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[10],[11],[18] 510  
Ending balance [1],[10],[11],[18]   $ 510
Investment, Identifier [Axis]: Monterey Financing S.à.r.l 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[10],[11],[16]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[10],[11],[16] $ 196  
Ending balance [1],[10],[11],[16]   $ 196
Investment, Identifier [Axis]: Monterey Financing S.à.r.l, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   467
Fair Value   $ 0
Investment, Identifier [Axis]: Monterey Financing, S.A.R.L 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[15] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[4],[5],[6],[15] $ 206  
Investment, Identifier [Axis]: Monterey Financing, S.A.R.L 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[15] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[4],[5],[6],[15] $ 721  
Investment, Identifier [Axis]: Monterey Financing, S.A.R.L 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[4],[5],[6],[15] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[4],[5],[6],[15] $ 220  
Investment, Identifier [Axis]: Monterey Financing, S.A.R.L 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[15] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[4],[5],[6],[15] $ 708  
Investment, Identifier [Axis]: Monterey Financing, S.A.R.L 5    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[17] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[4],[5],[6],[17] $ 503  
Investment, Identifier [Axis]: Monterey Financing, S.A.R.L, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 283  
Fair Value $ 0  
Investment, Identifier [Axis]: More Cowbell II, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[7] 0.16%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[7] $ 7,866  
Investment, Identifier [Axis]: More Cowbell II, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[7] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[7] $ 192  
Investment, Identifier [Axis]: More Cowbell II, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 871  
Fair Value (11)  
Investment, Identifier [Axis]: More Cowbell II, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 968  
Fair Value $ 0  
Investment, Identifier [Axis]: NAVEX TopCo, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[6],[7] 1.21%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[6],[7] $ 59,969  
Investment, Identifier [Axis]: NAVEX TopCo, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 5,394  
Fair Value $ (108)  
Investment, Identifier [Axis]: NC Ocala Co-Invest Beta, L.P. - LP Interest    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.06% [5] 0.07% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 2,854  
Ending balance 3,054 [5] $ 2,854 [1],[11]
Investment, Identifier [Axis]: NDC Acquisition Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[9],[11],[13]   0.33%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[13] $ 13,735  
Ending balance [1],[9],[11],[13]   $ 13,735
Investment, Identifier [Axis]: NDC Acquisition Corp. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[14] 0.27%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[14] $ 13,288  
Investment, Identifier [Axis]: NDC Acquisition Corp. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[14] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[14] $ 480  
Investment, Identifier [Axis]: NDC Acquisition Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 2,911 2,911
Fair Value 0 $ 0
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11]   1.80%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 74,829  
Ending balance [1],[8],[9],[11]   $ 74,829
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[7] 1.44%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[7] $ 71,173  
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[6],[7] 0.30%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[6],[7] $ 14,719  
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 2,617 26,585
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Navigator Acquiror, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 4.42% [2],[5],[6],[17] 4.78% [1],[9],[11],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[18] $ 198,728  
Ending balance 218,854 [2],[5],[6],[17] $ 198,728 [1],[9],[11],[18]
Investment, Identifier [Axis]: Navigator Acquiror, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 24,746 49,175
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Ncp Helix Holdings, LLC. - Preferred Shares    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [5] 0.01% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 472  
Ending balance $ 536 [5] $ 472 [1],[11]
Investment, Identifier [Axis]: Neptune Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[6],[14] 0.14%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[6],[14] $ 6,841  
Investment, Identifier [Axis]: Neptune Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 933  
Fair Value $ (19)  
Investment, Identifier [Axis]: Nintex Topco Limited    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.66% [4],[5],[6],[7] 0.77% [1],[8],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[10],[11] $ 31,987  
Ending balance $ 32,511 [4],[5],[6],[7] $ 31,987 [1],[8],[10],[11]
Investment, Identifier [Axis]: OHCP V TC COI, LP. - LP Interest    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.12% [5] 0.11% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 4,410  
Ending balance 6,055 [5] $ 4,410 [1],[11]
Investment, Identifier [Axis]: Odyssey Holding Company, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[11],[13]   0.45%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] $ 18,672  
Ending balance [1],[11],[13]   $ 18,672
Investment, Identifier [Axis]: Odyssey Holding Company, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[14] 0.34%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[14] $ 17,037  
Investment, Identifier [Axis]: Odyssey Holding Company, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[14] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[14] $ 1,635  
Investment, Identifier [Axis]: Onex Baltimore Buyer, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11]   0.67%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 27,720  
Ending balance [1],[8],[9],[11]   $ 27,720
Investment, Identifier [Axis]: Onex Baltimore Buyer, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[7],[23] 0.22%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[7],[23] $ 10,804  
Investment, Identifier [Axis]: Onex Baltimore Buyer, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[7] 0.18%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[7] $ 9,091  
Investment, Identifier [Axis]: Onex Baltimore Buyer, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   2,247
Fair Value   $ 0
Investment, Identifier [Axis]: Onex Baltimore Buyer, Inc., Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitment 177  
Fair Value 0  
Investment, Identifier [Axis]: Onex Baltimore Buyer, Inc., Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitment 4,729  
Fair Value $ 0  
Investment, Identifier [Axis]: Oranje Holdco Inc    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[14] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[14] $ 2,000  
Investment, Identifier [Axis]: Oranje Holdco Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 250  
Fair Value $ 0  
Investment, Identifier [Axis]: Other Cash and Cash Equivalents    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 2.72% 3.16% [1]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1] $ 131,272  
Ending balance 134,896 $ 131,272 [1]
Investment, Identifier [Axis]: PGIS Intermediate Holdings, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[10],[11],[12]   0.11%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[10],[11],[12] $ 4,470  
Ending balance [1],[8],[9],[10],[11],[12]   $ 4,470
Investment, Identifier [Axis]: PGIS Intermediate Holdings, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[5],[6],[7] 0.09%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[5],[6],[7] $ 4,522  
Investment, Identifier [Axis]: PGIS Intermediate Holdings, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[7] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[7] $ 249  
Investment, Identifier [Axis]: PGIS Intermediate Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 4,007  
Fair Value 0  
Investment, Identifier [Axis]: PGIS Intermediate Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 469 330
Fair Value $ (9) $ (7)
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.04% [2],[3],[5],[6],[7] 0.04% [1],[8],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[10],[11] $ 1,775  
Ending balance 1,971 [2],[3],[5],[6],[7] $ 1,775 [1],[8],[10],[11]
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 78 170
Fair Value 0 0
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 159 116
Fair Value $ (1) $ 0
Investment, Identifier [Axis]: Pavion Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[4],[5],[6],[7] 1.62%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[4],[5],[6],[7] $ 80,138  
Investment, Identifier [Axis]: Pavion Corp., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 18,279  
Fair Value (183)  
Investment, Identifier [Axis]: Pavion Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 9,565  
Fair Value $ 0  
Investment, Identifier [Axis]: Petrus Buyer Inc    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.04% [2],[3],[5],[6],[7] 0.04% [1],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 1,831  
Ending balance 1,882 [2],[3],[5],[6],[7] $ 1,831 [1],[8],[9],[11]
Investment, Identifier [Axis]: Petrus Buyer Inc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 595 595
Fair Value (9) (9)
Investment, Identifier [Axis]: Petrus Buyer Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 272 272
Fair Value $ 0 $ (8)
Investment, Identifier [Axis]: Phoenix 1 Buyer Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[15] 0.52%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[15] $ 25,573  
Investment, Identifier [Axis]: Phoenix 1 Buyer Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 5,009  
Fair Value (50)  
Investment, Identifier [Axis]: Point Broadband Acquisition, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[9],[11],[13]   2.44%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[13] $ 101,470  
Ending balance [1],[9],[11],[13]   $ 101,470
Investment, Identifier [Axis]: Point Broadband Acquisition, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[14] 1.73%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[14] $ 85,486  
Investment, Identifier [Axis]: Point Broadband Acquisition, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[14] 0.79%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[14] $ 38,969  
Investment, Identifier [Axis]: Point Broadband Acquisition, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   20,703
Fair Value   $ 0
Investment, Identifier [Axis]: Point Broadband Holdings, LLC - Class A Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.14% [5] 0.13% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 5,285  
Ending balance $ 7,049 [5] $ 5,285 [1],[11]
Investment, Identifier [Axis]: Point Broadband Holdings, LLC - Class Additional A Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.03% [5] 0.00% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 164  
Ending balance $ 1,515 [5] $ 164 [1],[11]
Investment, Identifier [Axis]: Point Broadband Holdings, LLC - Class Additional B Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [5] 0.03% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 1,136  
Ending balance $ 536 [5] $ 1,136 [1],[11]
Investment, Identifier [Axis]: Point Broadband Holdings, LLC - Class B Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.05% [5] 0.02% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 762  
Ending balance $ 2,492 [5] $ 762 [1],[11]
Investment, Identifier [Axis]: Porcelain Acquisition Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.06% [5],[6],[14] 1.32% [1],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[13] $ 54,829  
Ending balance $ 52,267 [5],[6],[14] $ 54,829 [1],[9],[11],[13]
Investment, Identifier [Axis]: Porcelain Acquisition Corp., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   14,481
Fair Value   $ 0
Investment, Identifier [Axis]: Profile Products, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [5],[6],[7] 0.15% [1],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 6,186  
Ending balance $ 1,189 [5],[6],[7] $ 6,186 [1],[8],[9],[11]
Investment, Identifier [Axis]: Profile Products, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.12% [2],[5],[6],[7] 0.03% [1],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11] $ 1,214  
Ending balance 5,857 [2],[5],[6],[7] $ 1,214 [1],[8],[11]
Investment, Identifier [Axis]: Profile Products, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   413
Fair Value   (9)
Investment, Identifier [Axis]: Profile Products, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment   237
Fair Value   $ 0
Investment, Identifier [Axis]: Profile Products, LLC, Revolver 1    
Schedule of Investments [Line Items]    
Unfunded commitment 520  
Fair Value (17)  
Investment, Identifier [Axis]: Profile Products, LLC, Revolver 2    
Schedule of Investments [Line Items]    
Unfunded commitment 353  
Fair Value $ 0  
Investment, Identifier [Axis]: Progress Residential PM Holdings, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.37% [2],[5],[6],[7] 1.69% [1],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 70,324  
Ending balance $ 67,900 [2],[5],[6],[7] $ 70,324 [1],[8],[9],[11]
Investment, Identifier [Axis]: Progress Residential PM Holdings, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [2],[5],[6],[7] 0.02% [1],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 833  
Ending balance 833 [2],[5],[6],[7] $ 833 [1],[8],[9],[11]
Investment, Identifier [Axis]: Progress Residential PM Holdings, LLC, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitment 16,623 16,623
Fair Value 0 0
Investment, Identifier [Axis]: Progress Residential PM Holdings, LLC, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitment 333 333
Fair Value 0 $ 0
Investment, Identifier [Axis]: Project Boost Purchaser, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11]   0.11%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 4,763  
Ending balance [1],[8],[9],[11]   $ 4,763
Investment, Identifier [Axis]: Project Boost Purchaser, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   905
Fair Value   0
Investment, Identifier [Axis]: Project Boost Purchaser, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment   591
Fair Value   $ (3)
Investment, Identifier [Axis]: Project Ruby Ultimate Parent Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.17% [2],[6],[7] 0.19% [1],[8]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8] $ 8,019  
Ending balance 8,201 [2],[6],[7] $ 8,019 [1],[8]
Investment, Identifier [Axis]: Pye-Barker Fire & Safety LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 18,278  
Fair Value $ (183)  
Investment, Identifier [Axis]: Quality Distribution LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[14] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[14] $ 681  
Investment, Identifier [Axis]: Quality Distribution LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[14] 0.37%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[14] $ 18,220  
Investment, Identifier [Axis]: Quality Distribution LLC, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitment 25  
Fair Value 0  
Investment, Identifier [Axis]: Quality Distribution LLC, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitment 1,931  
Fair Value (10)  
Investment, Identifier [Axis]: Quality Distribution LLC, Revolver 1    
Schedule of Investments [Line Items]    
Unfunded commitment 94  
Fair Value (3)  
Investment, Identifier [Axis]: Quality Distribution LLC, Revolver 2    
Schedule of Investments [Line Items]    
Unfunded commitment 3,000  
Fair Value $ (135)  
Investment, Identifier [Axis]: Qualus Power Services Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.65% [5],[14] 0.80% [1],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[13] $ 33,092  
Ending balance $ 31,962 [5],[14] $ 33,092 [1],[9],[11],[13]
Investment, Identifier [Axis]: Qualus Power Services Corp. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[14] 0.64%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[14] $ 31,515  
Investment, Identifier [Axis]: Qualus Power Services Corp., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 3,737 4,259
Fair Value 0 $ 0
Investment, Identifier [Axis]: RPBLS Midco, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11]   0.22%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 9,329  
Ending balance [1],[8],[9],[11]   $ 9,329
Investment, Identifier [Axis]: RPBLS Midco, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[5],[6],[7] 0.15%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[5],[6],[7] $ 7,388  
Investment, Identifier [Axis]: RPBLS Midco, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[5],[6],[17] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[5],[6],[17] $ 1,961  
Investment, Identifier [Axis]: RPBLS Midco, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   20
Fair Value   $ 0
Investment, Identifier [Axis]: RWL Holdings, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.58% [3],[5],[6],[7] 0.57% [1],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 23,827  
Ending balance 28,656 [3],[5],[6],[7] $ 23,827 [1],[8],[9],[11]
Investment, Identifier [Axis]: RWL Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   6,452
Fair Value   $ (65)
Investment, Identifier [Axis]: Rally Buyer, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 699  
Ending balance [1],[8],[9],[11]   $ 699
Investment, Identifier [Axis]: Rally Buyer, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[7] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[7] $ 824  
Investment, Identifier [Axis]: Rally Buyer, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[7] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[7] $ 42  
Investment, Identifier [Axis]: Rally Buyer, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 75 205
Fair Value 0 (2)
Investment, Identifier [Axis]: Rally Buyer, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 66 110
Fair Value $ 0 $ (2)
Investment, Identifier [Axis]: Razor Holdco, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.74% [5],[6],[7] 0.88% [1],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11] $ 36,600  
Ending balance $ 36,693 [5],[6],[7] $ 36,600 [1],[8],[11]
Investment, Identifier [Axis]: Red River Technology, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.61% [5],[6],[14] 1.93% [1],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[13] $ 80,180  
Ending balance $ 79,967 [5],[6],[14] $ 80,180 [1],[9],[11],[13]
Investment, Identifier [Axis]: Red River Technology, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   25,880
Fair Value   $ 0
Investment, Identifier [Axis]: Redwood Services Group, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.09% [5],[6],[7] 0.06% [1],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 2,290  
Ending balance 4,430 [5],[6],[7] $ 2,290 [1],[8],[9],[11]
Investment, Identifier [Axis]: Redwood Services Group, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   133
Fair Value   $ 0
Investment, Identifier [Axis]: Redwood Services Group, LLC, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitment 53  
Fair Value 0  
Investment, Identifier [Axis]: Redwood Services Group, LLC, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitment 139  
Fair Value $ 0  
Investment, Identifier [Axis]: Relativity ODA, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.43% [2],[5],[6],[14] 0.50% [1],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[13] $ 20,631  
Ending balance 21,087 [2],[5],[6],[14] $ 20,631 [1],[9],[11],[13]
Investment, Identifier [Axis]: Relativity ODA, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 3,292 3,292
Fair Value (49) $ (49)
Investment, Identifier [Axis]: Relay Purchaser, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11],[12]   0.88%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11],[12] $ 36,415  
Ending balance [1],[8],[9],[11],[12]   $ 36,415
Investment, Identifier [Axis]: Relay Purchaser, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment   7,143
Fair Value   $ (71)
Investment, Identifier [Axis]: RoadOne Inc    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [3],[5],[6],[14] 0.02% [1],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[13] $ 1,024  
Ending balance 1,075 [3],[5],[6],[14] $ 1,024 [1],[9],[11],[13]
Investment, Identifier [Axis]: RoadOne Inc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 163 255
Fair Value 0 (4)
Investment, Identifier [Axis]: RoadOne Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 275 226
Fair Value 0 $ 0
Investment, Identifier [Axis]: Roadsafe Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[9],[11],[13]   1.23%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[13] $ 51,336  
Ending balance [1],[9],[11],[13]   $ 51,336
Investment, Identifier [Axis]: Roadsafe Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[14] 0.57%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[14] $ 28,339  
Investment, Identifier [Axis]: Roadsafe Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[14] 0.40%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[14] $ 19,820  
Investment, Identifier [Axis]: Roadsafe Holdings, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[14] 0.08%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[14] $ 4,040  
Investment, Identifier [Axis]: Roadsafe Holdings, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   2,900
Fair Value   $ 0
Investment, Identifier [Axis]: S&P Global Engineering Solutions    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[14] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[14] $ 1,596  
Investment, Identifier [Axis]: S&P Global Engineering Solutions, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 249  
Fair Value $ 0  
Investment, Identifier [Axis]: SEKO Global Logistics Network, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.11% [3],[5],[6],[14] 0.05% [1],[10],[11],[12],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[10],[11],[12],[13] $ 1,978  
Ending balance $ 5,365 [3],[5],[6],[14] $ 1,978 [1],[10],[11],[12],[13]
Investment, Identifier [Axis]: SEKO Global Logistics Network, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [2],[3],[5],[6],[14] 0.15% [1],[9],[11],[12],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[12],[13] $ 6,214  
Ending balance $ 167 [2],[3],[5],[6],[14] $ 6,214 [1],[9],[11],[12],[13]
Investment, Identifier [Axis]: SEKO Global Logistics Network, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[5],[6],[14] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[5],[6],[14] $ 775  
Investment, Identifier [Axis]: SEKO Global Logistics Network, LLC 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[5],[6],[14] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[5],[6],[14] $ 1,985  
Investment, Identifier [Axis]: SEKO Global Logistics Network, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   399
Fair Value   0
Investment, Identifier [Axis]: SEKO Global Logistics Network, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 432 294
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: SG Acquisition, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 2.09% [5],[6],[17] 2.52% [1],[11],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[18] $ 104,974  
Ending balance 103,662 [5],[6],[17] $ 104,974 [1],[11],[18]
Investment, Identifier [Axis]: Safety Borrower Holdings LP    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[9],[11],[12],[13]   0.12%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[12],[13] $ 5,028  
Ending balance [1],[9],[11],[12],[13]   $ 5,028
Investment, Identifier [Axis]: Safety Borrower Holdings LP 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[5],[6],[14] 0.10%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[5],[6],[14] $ 5,032  
Investment, Identifier [Axis]: Safety Borrower Holdings LP 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[14] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[14] $ 276  
Investment, Identifier [Axis]: Safety Borrower Holdings LP, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 93 373
Fair Value 0 $ (4)
Investment, Identifier [Axis]: Sam Holding Co, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[9],[11],[13]   0.99%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[13] $ 41,306  
Ending balance [1],[9],[11],[13]   $ 41,306
Investment, Identifier [Axis]: Sam Holding Co, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[6],[14] 0.75%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[6],[14] $ 37,206  
Investment, Identifier [Axis]: Sam Holding Co, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[14] 0.23%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[14] $ 11,378  
Investment, Identifier [Axis]: Sam Holding Co, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[14] 0.32%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[14] $ 15,761  
Investment, Identifier [Axis]: Sam Holding Co, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 9,300 29,731
Fair Value 0 0
Investment, Identifier [Axis]: Sam Holding Co, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 6,000 5,500
Fair Value $ (75) $ 0
Investment, Identifier [Axis]: SelectQuote, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.34% [3],[5],[7] 1.62% [1],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11] $ 67,243  
Ending balance $ 66,538 [3],[5],[7] $ 67,243 [1],[8],[11]
Investment, Identifier [Axis]: Shelf Bidco Ltd    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.10% [3],[4],[5],[6],[7],[23] 0.12% [1],[8],[10]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[10] $ 4,938  
Ending balance $ 5,053 [3],[4],[5],[6],[7],[23] $ 4,938 [1],[8],[10]
Investment, Identifier [Axis]: Shelf Holdco Ltd Common Equity    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [4],[5] 0.00% [1],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[10],[11] $ 50  
Ending balance $ 88 [4],[5] $ 50 [1],[10],[11]
Investment, Identifier [Axis]: Sherlock Buyer Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.17% [2],[5],[6],[7] 0.20% [1],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 8,223  
Ending balance 8,267 [2],[5],[6],[7] $ 8,223 [1],[8],[9],[11]
Investment, Identifier [Axis]: Sherlock Buyer Corp., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 2,794 2,794
Fair Value (28) (28)
Investment, Identifier [Axis]: Sherlock Buyer Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 1,111 1,111
Fair Value $ (22) $ (22)
Investment, Identifier [Axis]: Shoals Holdings, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.24% [5],[14] 2.02% [1],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] $ 83,921  
Ending balance $ 61,350 [5],[14] $ 83,921 [1],[11],[13]
Investment, Identifier [Axis]: Smile Doctors, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.21% [2],[5],[6],[7] 0.27% [1],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 11,218  
Ending balance 10,571 [2],[5],[6],[7] $ 11,218 [1],[8],[9],[11]
Investment, Identifier [Axis]: Smile Doctors, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 2,607  
Fair Value (39)  
Investment, Identifier [Axis]: Smile Doctors, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 1,233 710
Fair Value $ (31) $ 0
Investment, Identifier [Axis]: Snoopy Bidco, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 6.11% [2],[5],[6],[7] 7.05% [1],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 293,329  
Ending balance 302,719 [2],[5],[6],[7] $ 293,329 [1],[8],[9],[11]
Investment, Identifier [Axis]: Snoopy Bidco, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 15,786 15,786
Fair Value (237) $ (237)
Investment, Identifier [Axis]: SpecialtyCare, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[9],[11],[12],[13]   0.29%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[12],[13] $ 12,209  
Ending balance [1],[9],[11],[12],[13]   $ 12,209
Investment, Identifier [Axis]: SpecialtyCare, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[14] 0.23%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[14] $ 11,592  
Investment, Identifier [Axis]: SpecialtyCare, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[15] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[15] $ 146  
Investment, Identifier [Axis]: SpecialtyCare, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 1,155 1,155
Fair Value 0 0
Investment, Identifier [Axis]: SpecialtyCare, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 865 614
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Spitfire Parent, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.59% [5],[6],[14] 1.30% [1],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] $ 53,960  
Ending balance $ 78,620 [5],[6],[14] $ 53,960 [1],[11],[13]
Investment, Identifier [Axis]: Spitfire Parent, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.24% [5],[6],[14] 0.26% [1],[11],[12],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[12],[13] $ 10,845  
Ending balance 12,128 [5],[6],[14] $ 10,845 [1],[11],[12],[13]
Investment, Identifier [Axis]: Spitfire Parent, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[9],[11],[13]   0.48%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[13] $ 20,059  
Ending balance [1],[9],[11],[13]   $ 20,059
Investment, Identifier [Axis]: Spitfire Parent, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   3,689
Fair Value   $ 0
Investment, Identifier [Axis]: Stamps.com, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 5.62% [5],[6],[7] 6.75% [1],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[11] $ 280,899  
Ending balance $ 278,069 [5],[6],[7] $ 280,899 [1],[8],[11]
Investment, Identifier [Axis]: State Street Institutional U.S. Government Money Market Fund    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.40%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance $ 19,961  
Investment, Identifier [Axis]: Stepping Stones Healthcare Services, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.05% [2],[5],[6],[7] 0.06% [1],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 2,690  
Ending balance 2,626 [2],[5],[6],[7] $ 2,690 [1],[8],[9],[11]
Investment, Identifier [Axis]: Stepping Stones Healthcare Services, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 155 441
Fair Value 0 0
Investment, Identifier [Axis]: Stepping Stones Healthcare Services, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 371 74
Fair Value $ (13) $ 0
Investment, Identifier [Axis]: TCFI AEVEX, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 2.23% [5],[6],[14] 2.44% [1],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] $ 101,373  
Ending balance $ 110,230 [5],[6],[14] $ 101,373 [1],[11],[13]
Investment, Identifier [Axis]: THL Fund IX Investors (Plymouth II), LP    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5] $ 249  
Investment, Identifier [Axis]: TPG IX Newark CI, L.P. - LP Interests    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [4],[5] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [4],[5] $ 1,965  
Investment, Identifier [Axis]: TRP Infrastructure Services, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.70% [5],[6],[14] 0.88% [1],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[13] $ 36,464  
Ending balance 34,608 [5],[6],[14] $ 36,464 [1],[9],[11],[13]
Investment, Identifier [Axis]: TRP Infrastructure Services, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   7,101
Fair Value   $ (71)
Investment, Identifier [Axis]: Tailwind Colony Holding Corporation    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[9],[11],[13]   1.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[13] $ 42,132  
Ending balance [1],[9],[11],[13]   $ 42,132
Investment, Identifier [Axis]: Tailwind Colony Holding Corporation 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[14] 0.11%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[14] $ 5,581  
Investment, Identifier [Axis]: Tailwind Colony Holding Corporation 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[14] 0.84%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[14] $ 41,465  
Investment, Identifier [Axis]: Tennessee Bidco Limited 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.04% [3],[4],[5],[6],[15] 0.46% [1],[10],[11],[12],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[10],[11],[12],[16] $ 19,134  
Ending balance $ 2,010 [3],[4],[5],[6],[15] $ 19,134 [1],[10],[11],[12],[16]
Investment, Identifier [Axis]: Tennessee Bidco Limited 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.10% [3],[4],[5],[6],[15] 0.81% [1],[10],[11],[12],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[10],[11],[12],[16] $ 33,693  
Ending balance $ 54,303 [3],[4],[5],[6],[15] $ 33,693 [1],[10],[11],[12],[16]
Investment, Identifier [Axis]: Tennessee Bidco Limited 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.33% [3],[4],[5],[6],[15] 1.28% [1],[10],[11],[12],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[10],[11],[12],[16] $ 53,088  
Ending balance $ 16,176 [3],[4],[5],[6],[15] $ 53,088 [1],[10],[11],[12],[16]
Investment, Identifier [Axis]: Tennessee Bidco Limited 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.12% [3],[4],[5],[6],[15] 0.38% [1],[10],[11],[12],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[10],[11],[12],[16] $ 15,718  
Ending balance $ 55,366 [3],[4],[5],[6],[15] $ 15,718 [1],[10],[11],[12],[16]
Investment, Identifier [Axis]: Tetra Technologies, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.36% [4],[5],[14] 0.43% [1],[10],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[10],[11],[13] $ 17,790  
Ending balance 17,790 [4],[5],[14] $ 17,790 [1],[10],[11],[13]
Investment, Identifier [Axis]: The Action Environmental Group, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[11],[12],[24]   3.17%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[12],[24] 132,022  
Ending balance [1],[11],[12],[24]   $ 132,022
Investment, Identifier [Axis]: The Action Environmental Group, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[11],[12],[24]   0.26%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[12],[24] 10,993  
Ending balance [1],[11],[12],[24]   $ 10,993
Investment, Identifier [Axis]: The Cook & Boardman Group, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[13]   1.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[13] $ 41,998  
Ending balance [1],[13]   $ 41,998
Investment, Identifier [Axis]: The Fertility Partners, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.10% [3],[4],[5],[6],[7] 0.11% [1],[8],[10],[11],[12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[10],[11],[12] $ 4,776  
Ending balance $ 4,913 [3],[4],[5],[6],[7] $ 4,776 [1],[8],[10],[11],[12]
Investment, Identifier [Axis]: The Fertility Partners, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.07% [3],[4],[5],[6],[7] 0.10% [1],[8],[9],[10],[11],[12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[10],[11],[12] $ 4,287  
Ending balance $ 3,512 [3],[4],[5],[6],[7] $ 4,287 [1],[8],[9],[10],[11],[12]
Investment, Identifier [Axis]: The Fertility Partners, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[4],[5],[6],[7] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[4],[5],[6],[7] $ 121  
Investment, Identifier [Axis]: The Fertility Partners, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   315
Fair Value   0
Investment, Identifier [Axis]: The Fertility Partners, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 127 28
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: The GI Alliance Management, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.10% [3],[5],[6],[7] 0.10% [1],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[13] $ 3,998  
Ending balance 4,942 [3],[5],[6],[7] $ 3,998 [1],[9],[11],[13]
Investment, Identifier [Axis]: The GI Alliance Management, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   883
Fair Value   $ (26)
Investment, Identifier [Axis]: The NPD Group L.P. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11]   1.78%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] 74,210  
Ending balance [1],[8],[9],[11]   $ 74,210
Investment, Identifier [Axis]: The NPD Group L.P. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11]   2.93%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 121,859  
Ending balance [1],[8],[9],[11]   $ 121,859
Investment, Identifier [Axis]: The NPD Group L.P., Revolver 1    
Schedule of Investments [Line Items]    
Unfunded commitment   7,729
Fair Value   0
Investment, Identifier [Axis]: The NPD Group L.P., Revolver 2    
Schedule of Investments [Line Items]    
Unfunded commitment   4,416
Fair Value   $ (44)
Investment, Identifier [Axis]: Thevelia US, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.03% [3],[4],[6],[17] 0.03% [1],[10],[12],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[10],[12],[18] $ 1,273  
Ending balance $ 1,299 [3],[4],[6],[17] $ 1,273 [1],[10],[12],[18]
Investment, Identifier [Axis]: Thevelia US, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.10% [3],[4],[5],[6],[17] 0.12% [1],[10],[11],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[10],[11],[18] $ 4,810  
Ending balance $ 4,908 [3],[4],[5],[6],[17] $ 4,810 [1],[10],[11],[18]
Investment, Identifier [Axis]: Titan Investment Company, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.79% [3],[5],[6],[15] 0.97% [1],[11],[12],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[12],[16] $ 40,136  
Ending balance $ 39,206 [3],[5],[6],[15] $ 40,136 [1],[11],[12],[16]
Investment, Identifier [Axis]: Trader Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.15% [2],[3],[4],[5],[6],[7] 0.17% [1],[8],[9],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[10],[11] $ 7,185  
Ending balance 7,300 [2],[3],[4],[5],[6],[7] $ 7,185 [1],[8],[9],[10],[11]
Investment, Identifier [Axis]: Trader Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 830 620
Fair Value $ (190) $ (11)
Investment, Identifier [Axis]: Tricor Horizon, LP    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [4],[5] 0.01% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 382  
Ending balance 386 [4],[5] $ 382 [1],[11]
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11]   1.61%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 67,079  
Ending balance [1],[8],[9],[11]   $ 67,079
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[6],[7] 1.13%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[6],[7] $ 55,812  
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[6],[7] 0.45%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[6],[7] $ 22,390  
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   10,916
Fair Value   0
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp., Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitment 402  
Fair Value 0  
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp., Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitment 11,274  
Fair Value (113)  
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 6,881 6,881
Fair Value $ 0 $ (69)
Investment, Identifier [Axis]: Trinity Partners Holdings, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.10% [2],[5],[6],[7] 0.11% [1],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 4,694  
Ending balance 4,742 [2],[5],[6],[7] $ 4,694 [1],[8],[9],[11]
Investment, Identifier [Axis]: Trinity Partners Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 1,433 1,433
Fair Value (14) $ (14)
Investment, Identifier [Axis]: Triple Lift, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11]   1.54%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 63,876  
Ending balance [1],[8],[9],[11]   $ 63,876
Investment, Identifier [Axis]: Triple Lift, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[7] 1.20%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[7] $ 59,500  
Investment, Identifier [Axis]: Triple Lift, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[6],[7] 0.05%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[6],[7] $ 2,681  
Investment, Identifier [Axis]: Triple Lift, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 4,747 4,747
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Turing Holdco, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.17% [3],[4],[5],[6],[15] 0.41% [1],[9],[10],[11],[12],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[10],[11],[12],[16] $ 17,160  
Ending balance $ 8,546 [3],[4],[5],[6],[15] $ 17,160 [1],[9],[10],[11],[12],[16]
Investment, Identifier [Axis]: Turing Holdco, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.08% [2],[3],[4],[5],[6],[15] 0.20% [1],[10],[11],[12],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[10],[11],[12],[16] $ 8,310  
Ending balance $ 3,992 [2],[3],[4],[5],[6],[15] $ 8,310 [1],[10],[11],[12],[16]
Investment, Identifier [Axis]: Turing Holdco, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [4],[5],[6],[15] 0.25%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [4],[5],[6],[15] $ 12,165  
Investment, Identifier [Axis]: Turing Holdco, Inc. 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [4],[5],[6],[15] 0.09%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [4],[5],[6],[15] $ 4,509  
Investment, Identifier [Axis]: Turing Holdco, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   3,239
Fair Value   $ 0
Investment, Identifier [Axis]: Turing Holdco, Inc., Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitment 31,468  
Fair Value 0  
Investment, Identifier [Axis]: Turing Holdco, Inc., Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitment 20,901  
Fair Value $ 0  
Investment, Identifier [Axis]: UMP Holdings, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[5],[6],[7] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[5],[6],[7] $ 1,068  
Investment, Identifier [Axis]: UMP Holdings, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[7] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[7] $ 1,463  
Investment, Identifier [Axis]: UMP Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 440  
Fair Value 0  
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11]   0.99%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 41,169  
Ending balance [1],[8],[9],[11]   $ 41,169
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[7] 0.63%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[7] $ 31,065  
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[6],[14] 0.32%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[6],[14] $ 15,734  
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 46,867 3,666
Fair Value 0 0
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 3,233 3,233
Fair Value $ (73) $ (32)
Investment, Identifier [Axis]: Unified Door & Hardware Group, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[14] 1.87%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[14] $ 92,486  
Investment, Identifier [Axis]: Unified Door & Hardware Group, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[11],[13]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] 953  
Ending balance [1],[11],[13]   $ 953
Investment, Identifier [Axis]: Unified Door & Hardware Group, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [11],[13]   1.23%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [11],[13] 51,064  
Ending balance [11],[13]   $ 51,064
Investment, Identifier [Axis]: Unified Door & Hardware Group, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [11],[13]   1.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [11],[13] $ 41,733  
Ending balance [11],[13]   $ 41,733
Investment, Identifier [Axis]: Unified Physician Management, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.04% [2],[3],[5],[6],[17] 0.05% [1],[9],[11],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[11],[18] $ 2,046  
Ending balance 2,102 [2],[3],[5],[6],[17] $ 2,046 [1],[9],[11],[18]
Investment, Identifier [Axis]: Unified Physician Management, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   77
Fair Value   0
Investment, Identifier [Axis]: Unified Physician Management, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 241 241
Fair Value 0 $ 0
Investment, Identifier [Axis]: United Mutual Acquisition Holdings, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11]   0.04%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 1,738  
Ending balance [1],[8],[9],[11]   $ 1,738
Investment, Identifier [Axis]: United Mutual Acquisition Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   1,275
Fair Value   $ 0
Investment, Identifier [Axis]: Veregy Consolidated, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.38% [14] 0.41% [1],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[13] $ 17,126  
Ending balance $ 18,680 [14] $ 17,126 [1],[11],[13]
Investment, Identifier [Axis]: Victory Buyer, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.18% [5],[6],[17] 0.20% [1],[11],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[18] $ 8,248  
Ending balance 8,970 [5],[6],[17] $ 8,248 [1],[11],[18]
Investment, Identifier [Axis]: WHCG Purchaser III, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11],[12]   0.83%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11],[12] $ 34,563  
Ending balance [1],[8],[9],[11],[12]   $ 34,563
Investment, Identifier [Axis]: WHCG Purchaser III, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[5],[6],[7] 0.53%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [3],[5],[6],[7] $ 26,419  
Investment, Identifier [Axis]: WHCG Purchaser III, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[3],[5],[6],[7] 0.08%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[3],[5],[6],[7] $ 4,084  
Investment, Identifier [Axis]: WHCG Purchaser III, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   10,490
Fair Value   0
Investment, Identifier [Axis]: WHCG Purchaser III, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 17 4,454
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: WPEngine, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[6],[7] 1.32%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[6],[7] $ 65,133  
Investment, Identifier [Axis]: WPEngine, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 6,667  
Fair Value (200)  
Investment, Identifier [Axis]: West Monroe Partners, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[8],[9],[11]   0.35%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 14,524  
Ending balance [1],[8],[9],[11]   $ 14,524
Investment, Identifier [Axis]: West Monroe Partners, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [5],[6],[7] 0.29%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [5],[6],[7] $ 14,377  
Investment, Identifier [Axis]: West Monroe Partners, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[6],[7] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[6],[7] $ 281  
Investment, Identifier [Axis]: West Monroe Partners, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   3,848
Fair Value   0
Investment, Identifier [Axis]: West Monroe Partners, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 1,155 1,443
Fair Value 0 $ 0
Investment, Identifier [Axis]: Westland Insurance Group LTD 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[10],[11],[12],[13]   0.99%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[10],[11],[12],[13] 41,209  
Ending balance [1],[10],[11],[12],[13]   $ 41,209
Investment, Identifier [Axis]: Westland Insurance Group LTD 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[9],[10],[11],[12],[16]   2.84%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[9],[10],[11],[12],[16] $ 118,210  
Ending balance [1],[9],[10],[11],[12],[16]   $ 118,210
Investment, Identifier [Axis]: Westland Insurance Group LTD, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment   572
Fair Value   $ 0
Investment, Identifier [Axis]: Windows Acquisition Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.01% [3],[5],[6],[14] 1.29% [1],[11],[12],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11],[12],[13] $ 53,729  
Ending balance $ 49,997 [3],[5],[6],[14] $ 53,729 [1],[11],[12],[13]
Investment, Identifier [Axis]: World Insurance Associates, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [2],[5],[6],[14] 0.75%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [2],[5],[6],[14] $ 36,914  
Investment, Identifier [Axis]: World Insurance Associates, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 47,025  
Fair Value (470)  
Investment, Identifier [Axis]: World Insurance Associates, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 2,939  
Fair Value $ (59)  
Investment, Identifier [Axis]: Zendesk Inc    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.03% [2],[3],[5],[6],[7] 0.04% [1],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[8],[9],[11] $ 1,542  
Ending balance 1,614 [2],[3],[5],[6],[7] $ 1,542 [1],[8],[9],[11]
Investment, Identifier [Axis]: Zendesk Inc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitment 361 361
Fair Value (5) (5)
Investment, Identifier [Axis]: Zendesk Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitment 169 169
Fair Value $ (3) $ (3)
Investment, Identifier [Axis]: Zoro Common Equity    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [5] 0.00% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 21  
Ending balance $ 21 [5] $ 21 [1],[11]
Investment, Identifier [Axis]: Zoro Series A Preferred Shares    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [5] 0.01% [1],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [1],[11] $ 362  
Ending balance $ 418 [5] $ 362 [1],[11]
[1] Unless otherwise indicated, all debt and equity investments held by the Company (which such term “Company” shall include the Company’s consolidated subsidiaries for purposes of this Consolidated Schedule of Investments) are denominated in dollars. As of December 31, 2022, the Company had investments denominated in Canadian Dollars (CAD), Euros (EUR), British Pounds (GBP), Danish Krone (DKK), Swedish Krona (SEK), and Norwegian Krone (NOK). All debt investments are income producing unless otherwise indicated. All equity investments are non-income producing unless otherwise noted. Certain portfolio company investments are subject to contractual restrictions on sales. The total par amount (in





thousands) is presented for debt investments, while the number of shares or units (in whole amounts) owned is presented for equity investments. Each of the Company’s investments is pledged as collateral, under one or more of its credit facilities unless otherwise indicated.
[2] Position or portion thereof is an unfunded commitment, and no interest is being earned on the unfunded portion, although the investment may be subject to unused commitment fees. Negative cost and fair value results from unamortized fees, which are capitalized to the investment cost. The unfunded commitment may be subject to a commitment termination date that may expire prior to the maturity date stated. See below for more information on the Company’s unfunded commitments:
[3] These investments are not pledged as collateral under any of the Company's credit facilities. For other debt investments that are pledged to the Company's credit facilities, a single investment may be divided into parts that are individually pledged as collateral to separate credit facilities. Any other debt investments listed above are pledged to financing facilities and are not available to satisfy the creditors of the Company.
[4] The investment is not a qualifying asset under Section 55(a) of the Investment Company Act of 1940, as amended (together with the rules and regulations promulgated thereunder, the “1940 Act”). The Company may not acquire any non-qualifying asset unless, at the time of acquisition, qualifying assets represent at least 70% of the Company’s total assets. As of December 31, 2023, non-qualifying assets represented 11.0% of total assets as calculated in accordance with regulatory requirements.

[5] These investments were valued using unobservable inputs and are considered Level 3 investments. Fair value was determined in good faith by or under the direction of the Board of Trustees (see Note 2), pursuant to the Company’s valuation policy.
[6] Unless otherwise indicated, all debt and equity investments held by the Company (which such term “Company” shall include the Company’s consolidated subsidiaries for purposes of this Consolidated Schedule of Investments) are denominated in dollars. As of December 31, 2023, the Company had investments denominated in Canadian Dollars (CAD), Euros (EUR), British Pounds (GBP), Danish Krone (DKK), Swedish Krona (SEK), and Norwegian Krone (NOK). All debt investments are income producing unless otherwise indicated. All equity investments are non-income producing unless otherwise noted. Certain portfolio company investments are subject to contractual restrictions on sales. The total par amount (in thousands) is presented for debt investments, while the number of shares or units (in whole amounts) owned is presented for equity investments. Each of the Company’s investments is pledged as collateral, under one or more of its credit facilities unless otherwise indicated.
[7] The interest rate floor on these investments as of December 31, 2023 was 0.75%.
[8] The interest rate floor on these investments as of December 31, 2022 was 0.75%
[9] Position or portion thereof is an unfunded loan commitment, and no interest is being earned on the unfunded portion, although the investment may be subject to unused commitment fees. Negative cost and fair value results from unamortized fees, which are capitalized to the investment cost. The unfunded loan commitment may be subject to a commitment termination date that may expire prior to the maturity date stated. See below for more information on the Company’s unfunded commitments:
[10] The investment is not a qualifying asset under Section 55(a) of the 1940 Act. The Company may not acquire any non-qualifying asset unless, at the time of acquisition, qualifying assets represent at least 70% of the Company’s total assets. As of December 31, 2022, non-qualifying assets represented 11.0% of total assets as calculated in accordance with regulatory requirements.
[11] These investments were valued using unobservable inputs and are considered Level 3 investments. Fair value was determined in good faith by or under the direction of the Board of Trustees (see Note 2 and Note 5), pursuant to the Company’s valuation policy.
[12] These debt investments are not pledged as collateral under any of the Company's credit facilities. For other debt investments that are pledged to the Company's credit facilities, a single investment may be divided into parts that are individually pledged as collateral to separate credit facilities. Any other debt investments listed above are pledged to financing facilities and are not available to satisfy the creditors of the Company.
[13] The interest rate floor on these investments as of December 31, 2022 was 1.00%
[14] The interest rate floor on these investments as of December 31, 2023 was 1.00%
[15] There are no interest rate floors on these investments.
[16] There are no interest rate floors on these investments.
[17] The interest rate floor on these investments as of December 31, 2023 was 0.50%.
[18] The interest rate floor on these investments as of December 31, 2022 was 0.50%
[19] The interest rate floor on these investments as of December 31, 2023 was 1.50%.
[20] The interest rate floor on these investments as of December 31, 2022 was 1.50%
(14)The interest rate floor on these investments as of December 31, 2022 was 2.00%
(15)For unsettled positions the interest rate does not include the base rate.
[21] Under the 1940 Act, the Company would be deemed to “control” a portfolio company if the Company owned more than 25% of its outstanding voting securities and/or held the power to exercise control over the management or policies of the portfolio company. As of December 31, 2023, the Company does not “control” any of these portfolio companies. Under the 1940 Act, the Company would be deemed an “affiliated person” of a portfolio company if the Company owns 5% or more of the portfolio company’s outstanding voting securities. As of December 31, 2023, the Company’s non-controlled/affiliated investments were as follows:
Fair value as of December 31, 2022
Gross AdditionsGross Reductions
Net change in Unrealized Gains (Losses)
Net Realized Gain (Loss)
Fair value as of December 31, 2023
Dividend and Interest Income
Non-controlled/Affiliated Investments
Blackstone Donegal Holdings LP$56,584 $— $(44,921)$(14,156)$8,283 $5,790 $— 
Total$56,584 $ $(44,921)$(14,156)$8,283 $5,790 $ 
[22] Loan was on non-accrual status as of December 31, 2023.
[23] These loans are “last-out” portions of loans. The “last-out” portion of the Company's loan investment generally earns a higher interest rate than the “first-out” portion, and in exchange the “first-out” portion would generally receive priority with respect to payment principal, interest and any other amounts due thereunder over the “last-out” portion.
[24] The interest rate floor on these investments as of December 31, 2022 was 1.25%.