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Condensed Consolidated Schedule of Investments (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Percentage of portfolio above floor rate 92.90% 93.70%
Percentage of Net Assets 202.40% 199.30%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance $ 9,868,440  
Ending balance $ 10,439,173 $ 9,868,440
Non-controlled/non-affiliated investments    
Schedule of Investments [Line Items]    
Percentage of Net Assets 202.41% [1] 199.19% [2]
Unfunded commitments $ 1,421,314 $ 985,936
Fair Value (10,003) (6,660)
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2] 9,862,650  
Ending balance $ 10,433,071 [1] $ 9,862,650 [2]
Non-controlled/affiliated investments    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.12% [1] 0.12% [2]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2] $ 5,790  
Ending balance 6,102 [1] $ 5,790 [2]
Non-controlled/affiliated investments | Blackstone Donegal Holdings LP    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance 5,790 56,584
Gross Additions 0 0
Gross Reductions 0 (44,921)
Net Change in Unrealized Gains (Losses) 312 (14,156)
Net Realized Gain (Loss) 0 8,283
Ending balance 6,102 5,790
Dividend and Interest Income 0 0
Affiliated investments    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance 5,790 56,584
Gross Additions 0 0
Gross Reductions 0 (44,921)
Net Change in Unrealized Gains (Losses) 312 (14,156)
Net Realized Gain (Loss) 0 8,283
Ending balance 6,102 5,790
Dividend and Interest Income $ 0 $ 0
Qualifying Assets    
Schedule of Investments [Line Items]    
Percentage of Net Assets 70.00%  
Non-qualifying Assets    
Schedule of Investments [Line Items]    
Percentage of Net Assets 11.20% 11.00%
Low | Qualifying Assets    
Schedule of Investments [Line Items]    
Percentage of Net Assets   70.00%
Investment, Identifier [Axis]: 123Dentist, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.03% [1],[3],[4],[5],[6] 0.03% [2],[7],[8],[9],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[10],[11] $ 1,389  
Ending balance 1,584 [1],[3],[4],[5],[6] $ 1,389 [2],[7],[8],[9],[10],[11]
Investment, Identifier [Axis]: 123Dentist, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 45 276
Fair Value $ 0 $ (68)
Investment, Identifier [Axis]: ACI Group Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 2.30% [1],[3],[4],[5],[6] 2.31% [2],[7],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] $ 114,347  
Ending balance $ 118,505 [1],[3],[4],[5],[6] $ 114,347 [2],[7],[8],[9],[11]
Investment, Identifier [Axis]: ACI Group Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.03% [1],[3],[4],[5],[6] 0.03% [2],[7],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] $ 1,619  
Ending balance 1,735 [1],[3],[4],[5],[6] $ 1,619 [2],[7],[8],[9],[11]
Investment, Identifier [Axis]: ACI Group Holdings, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 11,022 14,182
Fair Value 0 0
Investment, Identifier [Axis]: ACI Group Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 9,832 9,832
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.13% [1],[6],[12] 0.14% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 6,849  
Ending balance $ 6,831 [1],[6],[12] $ 6,849 [2],[11],[13]
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.03% [1],[6],[12] 0.03% [2],[8],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[11],[13] $ 1,615  
Ending balance $ 1,637 [1],[6],[12] $ 1,615 [2],[8],[11],[13]
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[4],[6],[12] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[4],[6],[12] $ 353  
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 948 1,301
Fair Value $ 0 $ (26)
Investment, Identifier [Axis]: AGI Group Holdings LP - A2 Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.00% [1],[6] 0.01% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 507  
Ending balance $ 209 [1],[6] $ 507 [2],[11]
Investment, Identifier [Axis]: AGI-CFI Holdings, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[6] 1.79%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[6] $ 92,080  
Investment, Identifier [Axis]: AGI-CFI Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[11]   1.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] 74,470  
Ending balance [2],[7],[11]   $ 74,470
Investment, Identifier [Axis]: AGI-CFI Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[11]   0.36%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 17,847  
Ending balance [2],[7],[11]   $ 17,847
Investment, Identifier [Axis]: AI Altius Bidco, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.02% [1],[5],[6],[14] 0.02% [2],[9],[11],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[11],[15] $ 960  
Ending balance $ 960 [1],[5],[6],[14] $ 960 [2],[9],[11],[15]
Investment, Identifier [Axis]: AI Altius Bidco, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.13% [1],[3],[4],[6] 0.13% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 6,612  
Ending balance 6,612 [1],[3],[4],[6] $ 6,612 [2],[7],[8],[11]
Investment, Identifier [Axis]: AI Altius Bidco, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 158 158
Fair Value 0 $ 0
Investment, Identifier [Axis]: ALKU, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[9],[11]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[11] $ 796  
Ending balance [2],[7],[9],[11]   $ 796
Investment, Identifier [Axis]: ALKU, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[5],[6] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[5],[6] $ 796  
Investment, Identifier [Axis]: ALKU, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[6] 0.51%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[6] $ 26,129  
Investment, Identifier [Axis]: ASP Endeavor Acquisition, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.24% [1],[5],[6],[16] 0.25% [2],[9],[11],[17]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[11],[17] $ 12,467  
Ending balance $ 12,435 [1],[5],[6],[16] $ 12,467 [2],[9],[11],[17]
Investment, Identifier [Axis]: AVE Holdings I Corp.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.01% [1],[6] 0.01% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 596  
Ending balance $ 618 [1],[6] $ 596 [2],[11]
Investment, Identifier [Axis]: Abaco Energy Technologies, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.16% [1],[6],[18] 0.35% [2],[11],[19]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[19] $ 17,563  
Ending balance $ 8,125 [1],[6],[18] $ 17,563 [2],[11],[19]
Investment, Identifier [Axis]: Albireo Energy, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.37% [1],[5],[6],[12] 1.43% [2],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[11],[13] $ 70,722  
Ending balance $ 70,540 [1],[5],[6],[12] $ 70,722 [2],[9],[11],[13]
Investment, Identifier [Axis]: Albireo Energy, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.41% [1],[5],[6],[12] 0.12% [2],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[11],[13] $ 5,726  
Ending balance $ 21,172 [1],[5],[6],[12] $ 5,726 [2],[9],[11],[13]
Investment, Identifier [Axis]: Albireo Energy, LLC 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.11% [1],[5],[6],[12] 0.43% [2],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[11],[13] $ 21,227  
Ending balance $ 5,711 [1],[5],[6],[12] $ 21,227 [2],[9],[11],[13]
Investment, Identifier [Axis]: Alera Group, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.07% [1],[3],[4],[6] 0.07% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 3,659  
Ending balance 3,708 [1],[3],[4],[6] $ 3,659 [2],[7],[8],[11]
Investment, Identifier [Axis]: Alera Group, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 1,226 1,291
Fair Value 0 $ (6)
Investment, Identifier [Axis]: Amerilife Holdings LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[8],[9],[11]   0.04%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] $ 2,145  
Ending balance [2],[7],[8],[9],[11]   $ 2,145
Investment, Identifier [Axis]: Amerilife Holdings LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[5],[6] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[5],[6] $ 2,267  
Investment, Identifier [Axis]: Amerilife Holdings LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 440  
Fair Value 0  
Investment, Identifier [Axis]: Amerilife Holdings LLC, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments   75
Fair Value   0
Investment, Identifier [Axis]: Amerilife Holdings LLC, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments   488
Fair Value   (5)
Investment, Identifier [Axis]: Amerilife Holdings LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 243 243
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Amerivet Partners Management, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[5],[6] 0.11%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[5],[6] $ 5,586  
Investment, Identifier [Axis]: Amerivet Partners Management, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[8],[9],[11]   0.03%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] 1,341  
Ending balance [2],[7],[8],[9],[11]   $ 1,341
Investment, Identifier [Axis]: Amerivet Partners Management, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[9],[11]   0.09%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[11] 4,259  
Ending balance [2],[7],[9],[11]   $ 4,259
Investment, Identifier [Axis]: Amerivet Partners Management, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 589 589
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Anaplan, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.03% [1],[3],[4],[5],[6] 0.04% [2],[7],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] $ 1,794  
Ending balance 1,804 [1],[3],[4],[5],[6] $ 1,794 [2],[7],[8],[9],[11]
Investment, Identifier [Axis]: Anaplan, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 161 161
Fair Value 0 $ (1)
Investment, Identifier [Axis]: Apex Companies, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[8],[9],[11],[13]   0.03%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[9],[11],[13] $ 1,600  
Ending balance [2],[8],[9],[11],[13]   $ 1,600
Investment, Identifier [Axis]: Apex Companies, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[5],[6],[12] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[5],[6],[12] $ 1,589  
Investment, Identifier [Axis]: Apex Companies, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[4],[6],[12] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[4],[6],[12] $ 71  
Investment, Identifier [Axis]: Apex Companies, LLC 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[4],[5],[6],[12] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[4],[5],[6],[12] $ 366  
Investment, Identifier [Axis]: Apex Companies, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   369
Fair Value   $ (5)
Investment, Identifier [Axis]: Apex Companies, LLC, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 163  
Fair Value 0  
Investment, Identifier [Axis]: Apex Companies, LLC, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 495  
Fair Value $ (6)  
Investment, Identifier [Axis]: Armada Parent, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.49% [1],[3],[4],[6] 0.51% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 25,435  
Ending balance 25,382 [1],[3],[4],[6] $ 25,435 [2],[7],[8],[11]
Investment, Identifier [Axis]: Armada Parent, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   1,250
Fair Value   0
Investment, Identifier [Axis]: Armada Parent, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,000 3,000
Fair Value $ (30) $ (30)
Investment, Identifier [Axis]: Ascend Buyer, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.39% [1],[3],[6] 0.37% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 18,415  
Ending balance $ 20,308 [1],[3],[6] $ 18,415 [2],[7],[11]
Investment, Identifier [Axis]: Ascend Buyer, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.01% [1],[3],[4],[6] 0.04% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 1,945  
Ending balance 614 [1],[3],[4],[6] $ 1,945 [2],[7],[11]
Investment, Identifier [Axis]: Ascend Buyer, LLC 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[8],[11]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] 624  
Ending balance [2],[7],[8],[11]   $ 624
Investment, Identifier [Axis]: Ascend Buyer, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,293 1,293
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Azurite Intermediate Holdings Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[6] 0.21%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[6] $ 10,863  
Investment, Identifier [Axis]: Azurite Intermediate Holdings Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 25,650  
Fair Value (192)  
Investment, Identifier [Axis]: Azurite Intermediate Holdings Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 4,104  
Fair Value $ (62)  
Investment, Identifier [Axis]: BP Purchaser, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.13% [1],[3],[6] 0.14% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 6,968  
Ending balance $ 6,950 [1],[3],[6] $ 6,968 [2],[7],[11]
Investment, Identifier [Axis]: BPPH2 Limited    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.64% [1],[5],[6],[14],[20] 0.67% [2],[9],[10],[11],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[10],[11],[15] $ 33,272  
Ending balance $ 33,195 [1],[5],[6],[14],[20] $ 33,272 [2],[9],[10],[11],[15]
Investment, Identifier [Axis]: Bamboo US BidCo LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.01% [1],[4],[5],[6],[12],[20] 0.01% [2],[8],[9],[10],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[9],[10],[11],[13] $ 667  
Ending balance $ 685 [1],[4],[5],[6],[12],[20] $ 667 [2],[8],[9],[10],[11],[13]
Investment, Identifier [Axis]: Bamboo US BidCo LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.01% [1],[5],[6],[12],[20] 0.01% [2],[9],[10],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[10],[11],[13] $ 373  
Ending balance 372 [1],[5],[6],[12],[20] $ 373 [2],[9],[10],[11],[13]
Investment, Identifier [Axis]: Bamboo US BidCo LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 95 99
Fair Value 0 0
Investment, Identifier [Axis]: Bamboo US BidCo LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 142 142
Fair Value $ (2) $ (3)
Investment, Identifier [Axis]: Barbri Holdings, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.17% [1],[3],[6] 1.17% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 58,055  
Ending balance $ 60,447 [1],[3],[6] $ 58,055 [2],[7],[11]
Investment, Identifier [Axis]: Bazaarvoice, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 4.38% [1],[4],[6],[14] 4.57% [2],[8],[11],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[11],[15] $ 226,169  
Ending balance $ 225,592 [1],[4],[6],[14] $ 226,169 [2],[8],[11],[15]
Investment, Identifier [Axis]: Bazaarvoice, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.29% [1],[6],[14] 0.31% [2],[11],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[15] $ 15,244  
Ending balance 15,206 [1],[6],[14] $ 15,244 [2],[11],[15]
Investment, Identifier [Axis]: Bazaarvoice, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 28,662 28,662
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Beeline, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.10% [1],[3],[4],[5],[6] 0.10% [2],[7],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] $ 4,939  
Ending balance 4,927 [1],[3],[4],[5],[6] $ 4,939 [2],[7],[8],[9],[11]
Investment, Identifier [Axis]: Beeline, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 514 514
Fair Value (3) (3)
Investment, Identifier [Axis]: Beeline, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 591 591
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Blackstone Donegal Holdings LP - LP Interests (Westland Insurance Group LTD)    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.12% [1],[6],[20],[21] 0.12% [2],[10],[11],[22]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[10],[11],[22] $ 5,790  
Ending balance $ 6,102 [1],[6],[20],[21] $ 5,790 [2],[10],[11],[22]
Investment, Identifier [Axis]: BlueCat Networks USA, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.04% [1],[3],[5],[6] 0.04% [2],[7],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[11] $ 1,913  
Ending balance $ 1,918 [1],[3],[5],[6] $ 1,913 [2],[7],[9],[11]
Investment, Identifier [Axis]: BlueCat Networks USA, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.01% [1],[3],[5],[6] 0.01% [2],[7],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[11] $ 336  
Ending balance $ 337 [1],[3],[5],[6] $ 336 [2],[7],[9],[11]
Investment, Identifier [Axis]: BlueCat Networks USA, Inc. 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.00% [1],[3],[4],[5],[6] 0.00% [2],[7],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] $ 61  
Ending balance 61 [1],[3],[4],[5],[6] $ 61 [2],[7],[8],[9],[11]
Investment, Identifier [Axis]: BlueCat Networks USA, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 276 277
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Bluefin Holding, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.44% [1],[4],[5],[6],[12] 0.45% [2],[8],[9],[10],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[9],[10],[11],[13] $ 22,381  
Ending balance 22,631 [1],[4],[5],[6],[12] $ 22,381 [2],[8],[9],[10],[11],[13]
Investment, Identifier [Axis]: Bluefin Holding, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,244 2,244
Fair Value $ (11) $ (34)
Investment, Identifier [Axis]: Box Co-Invest Blocker, LLC - (BP Alpha Holdings, L.P.) - Class A Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[6] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[6] $ 302  
Investment, Identifier [Axis]: Box Co-Invest Blocker, LLC - (BP Alpha Holdings, L.P.) - Class C Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[6] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[6] $ 96  
Investment, Identifier [Axis]: Box Co-Invest Blocker, LLC - Class A Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[11]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] 358  
Ending balance [2],[11]   $ 358
Investment, Identifier [Axis]: Box Co-Invest Blocker, LLC - Class C Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[11]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 92  
Ending balance [2],[11]   $ 92
Investment, Identifier [Axis]: BradyIFS Holdings, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.75% [1],[4],[6],[12] 1.81% [2],[8],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[11],[13] $ 89,599  
Ending balance $ 90,366 [1],[4],[6],[12] $ 89,599 [2],[8],[11],[13]
Investment, Identifier [Axis]: BradyIFS Holdings, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.05% [1],[4],[6],[12] 0.05% [2],[8],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[11],[13] $ 2,372  
Ending balance 2,366 [1],[4],[6],[12] $ 2,372 [2],[8],[11],[13]
Investment, Identifier [Axis]: BradyIFS Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 7,613 7,613
Fair Value 0 0
Investment, Identifier [Axis]: BradyIFS Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 7,758 7,758
Fair Value $ (78) $ (155)
Investment, Identifier [Axis]: Brave Parent Holdings, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.24% [1],[3],[4],[6] 1.28% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 63,346  
Ending balance 63,684 [1],[3],[4],[6] $ 63,346 [2],[7],[8],[11]
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 7,282 7,282
Fair Value (55) (55)
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,641 3,641
Fair Value $ (18) $ (36)
Investment, Identifier [Axis]: Bution Holdco 2, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.35% [1],[6],[12] 1.42% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 70,143  
Ending balance $ 69,830 [1],[6],[12] $ 70,143 [2],[11],[13]
Investment, Identifier [Axis]: CCBlue Bidco, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.18% [1],[3],[6] 0.18% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 9,046  
Ending balance $ 9,369 [1],[3],[6] $ 9,046 [2],[7],[11]
Investment, Identifier [Axis]: CFCo LLC (Benefytt Technologies, Inc.)    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.00% [1],[6],[14],[23],[24] 0.00% [2],[11],[15],[22],[25]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[15],[22],[25] $ 68  
Ending balance $ 0 [1],[6],[14],[23],[24] $ 68 [2],[11],[15],[22],[25]
Investment, Identifier [Axis]: CFCo LLC (Benefytt Technologies, Inc.) - Class B Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.00% [1],[6] 0.00% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 0  
Ending balance $ 0 [1],[6] $ 0 [2],[11]
Investment, Identifier [Axis]: CFGI Holdings, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.13% [1],[3],[4],[6] 0.14% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 6,942  
Ending balance 6,923 [1],[3],[4],[6] $ 6,942 [2],[7],[8],[11]
Investment, Identifier [Axis]: CFGI Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,050 1,050
Fair Value $ (21) $ (21)
Investment, Identifier [Axis]: CFS Brands, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 2.28% [1],[4],[6],[12],[20] 2.34% [2],[8],[10],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[10],[11],[13] $ 115,897  
Ending balance 117,655 [1],[4],[6],[12],[20] $ 115,897 [2],[8],[10],[11],[13]
Investment, Identifier [Axis]: CFS Brands, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 12,118 12,118
Fair Value (121) 0
Investment, Identifier [Axis]: CFS Brands, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 18,177 18,177
Fair Value $ (91) $ (364)
Investment, Identifier [Axis]: COP Home Services TopCo IV, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.73% [1],[4],[5],[6],[12] 0.76% [2],[8],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[9],[11],[13] $ 37,541  
Ending balance 37,446 [1],[4],[5],[6],[12] $ 37,541 [2],[8],[9],[11],[13]
Investment, Identifier [Axis]: COP Home Services TopCo IV, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 8,730 8,730
Fair Value (131) (131)
Investment, Identifier [Axis]: COP Home Services TopCo IV, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,509 3,509
Fair Value $ (38) $ (38)
Investment, Identifier [Axis]: CPI Buyer, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.58% [1],[3],[4],[6] 0.61% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 30,063  
Ending balance 30,063 [1],[3],[4],[6] $ 30,063 [2],[7],[8],[11]
Investment, Identifier [Axis]: CPI Buyer, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,214 3,214
Fair Value $ (64) $ (64)
Investment, Identifier [Axis]: CPI Intermediate Holdings Inc    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.08% [1],[3],[4],[5],[6] 0.08% [2],[7],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] $ 3,924  
Ending balance 3,914 [1],[3],[4],[5],[6] $ 3,924 [2],[7],[8],[9],[11]
Investment, Identifier [Axis]: CPI Intermediate Holdings Inc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 966 966
Fair Value (10) $ (10)
Investment, Identifier [Axis]: Caerus Midco 2 S.À. R.L - Additional Vehicle Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[10],[11]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[10],[11] 1  
Ending balance [2],[10],[11]   $ 1
Investment, Identifier [Axis]: Caerus Midco 2 S.À. R.L - Vehicle Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[10],[11]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[10],[11] $ 54  
Ending balance [2],[10],[11]   $ 54
Investment, Identifier [Axis]: Caerus Midco 2 S.à r.l. - Additional Vehicle Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[6],[20] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[6],[20] $ 1  
Investment, Identifier [Axis]: Caerus Midco 2 S.à r.l. - Vehicle Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[6],[20] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[6],[20] $ 54  
Investment, Identifier [Axis]: Caerus US 1, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.19% [1],[3],[6],[20] 0.20% [2],[7],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[10],[11] $ 9,788  
Ending balance $ 9,862 [1],[3],[6],[20] $ 9,788 [2],[7],[10],[11]
Investment, Identifier [Axis]: Caerus US 1, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.06% [1],[3],[4],[6],[20] 0.06% [2],[7],[8],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[10],[11] $ 3,163  
Ending balance $ 2,858 [1],[3],[4],[6],[20] $ 3,163 [2],[7],[8],[10],[11]
Investment, Identifier [Axis]: Caerus US 1, Inc. 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.00% [1],[3],[4],[6],[20] 0.02% [2],[7],[8],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[10],[11] $ 791  
Ending balance $ 138 [1],[3],[4],[6],[20] $ 791 [2],[7],[8],[10],[11]
Investment, Identifier [Axis]: Caerus US 1, Inc. 4    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[6],[14],[20] 0.97%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[6],[14],[20] $ 50,000  
Investment, Identifier [Axis]: Caerus US 1, Inc., Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 836 836
Fair Value 0 0
Investment, Identifier [Axis]: Caerus US 1, Inc., Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 178 178
Fair Value 0 0
Investment, Identifier [Axis]: Caerus US 1, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,287 322
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Cambium Holdings, LLC - Senior Preferred Interests    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.32% [1],[6] 0.32% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 15,955  
Ending balance $ 16,496 [1],[6] $ 15,955 [2],[11]
Investment, Identifier [Axis]: Cambium Learning Group, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 5.59% [1],[3],[4],[6] 5.84% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 289,143  
Ending balance 288,404 [1],[3],[4],[6] $ 289,143 [2],[7],[8],[11]
Investment, Identifier [Axis]: Cambium Learning Group, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 43,592 43,592
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Canadian Hospital Specialties Ltd.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.13% [1],[5],[6],[14],[20] 0.14% [2],[9],[10],[11],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[10],[11],[15] $ 7,075  
Ending balance $ 6,824 [1],[5],[6],[14],[20] $ 7,075 [2],[9],[10],[11],[15]
Investment, Identifier [Axis]: Canadian Hospital Specialties Ltd. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.48% [1],[5],[6],[12],[20] 0.51% [2],[9],[10],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[10],[11],[13] $ 25,356  
Ending balance $ 24,620 [1],[5],[6],[12],[20] $ 25,356 [2],[9],[10],[11],[13]
Investment, Identifier [Axis]: Canadian Hospital Specialties Ltd. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.05% [1],[3],[5],[6],[20] 0.05% [2],[7],[9],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[10],[11] $ 2,683  
Ending balance $ 2,598 [1],[3],[5],[6],[20] $ 2,683 [2],[7],[9],[10],[11]
Investment, Identifier [Axis]: Capstone Logistics, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.11% [1],[6],[12] 0.11% [2],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[13] $ 5,501  
Ending balance $ 5,487 [1],[6],[12] $ 5,501 [2],[13]
Investment, Identifier [Axis]: Castle Management Borrower, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.45% [1],[4],[6],[12] 0.46% [2],[8],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[11],[13] $ 22,940  
Ending balance 23,275 [1],[4],[6],[12] $ 22,940 [2],[8],[11],[13]
Investment, Identifier [Axis]: Castle Management Borrower, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,917 2,917
Fair Value $ 0 $ (44)
Investment, Identifier [Axis]: Circana Group, L.P.    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[6] 0.15%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[6] $ 7,728  
Investment, Identifier [Axis]: Circana Group, L.P. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 2.33% [1],[3],[6] 2.43% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 120,332  
Ending balance $ 120,026 [1],[3],[6] $ 120,332 [2],[7],[11]
Investment, Identifier [Axis]: Circana Group, L.P. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.50% [1],[3],[6] 1.56% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 77,153  
Ending balance 77,533 [1],[3],[6] $ 77,153 [2],[7],[11]
Investment, Identifier [Axis]: Circana Group, L.P. 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[8],[11]   0.05%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] 2,484  
Ending balance [2],[7],[8],[11]   $ 2,484
Investment, Identifier [Axis]: Circana Group, L.P., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 6,072 11,316
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Clearview Buyer, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.17% [1],[3],[4],[5],[6] 0.18% [2],[7],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] $ 8,909  
Ending balance 8,986 [1],[3],[4],[5],[6] $ 8,909 [2],[7],[8],[9],[11]
Investment, Identifier [Axis]: Clearview Buyer, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 3,668 3,668
Fair Value 0 0
Investment, Identifier [Axis]: Clearview Buyer, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 898 898
Fair Value $ (9) $ (18)
Investment, Identifier [Axis]: Color Intermediate LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.39% [1],[3],[6] 0.41% [2],[7],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[11] $ 20,160  
Ending balance $ 20,109 [1],[3],[6] $ 20,160 [2],[7],[9],[11]
Investment, Identifier [Axis]: Community Brands ParentCo, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.09% [1],[3],[4],[5],[6] 0.10% [2],[7],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] $ 4,893  
Ending balance 4,892 [1],[3],[4],[5],[6] $ 4,893 [2],[7],[8],[9],[11]
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   588
Fair Value   (6)
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 345 345
Fair Value $ (1) $ (1)
Investment, Identifier [Axis]: Confine Visual Bidco    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.27% [1],[3],[6],[20] 0.28% [2],[7],[8],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[10],[11] $ 13,936  
Ending balance $ 13,891 [1],[3],[6],[20] $ 13,936 [2],[7],[8],[10],[11]
Investment, Identifier [Axis]: Confine Visual Bidco, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   3,043
Fair Value   $ 0
Investment, Identifier [Axis]: Connatix Buyer, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.38% [1],[3],[4],[5],[6] 0.39% [2],[7],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] $ 19,362  
Ending balance 19,512 [1],[3],[4],[5],[6] $ 19,362 [2],[7],[8],[9],[11]
Investment, Identifier [Axis]: Connatix Buyer, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 5,431 5,431
Fair Value $ (407) $ (448)
Investment, Identifier [Axis]: Connatix Parent, LLC - Class L Common Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.00% [1],[6] 0.00% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 117  
Ending balance 124 [1],[6] $ 117 [2],[11]
Investment, Identifier [Axis]: Continental Buyer, Inc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 7,185  
Fair Value 0  
Investment, Identifier [Axis]: Continental Buyer, Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,674  
Fair Value 0  
Investment, Identifier [Axis]: Continental Buyer, Inc, Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 18,183  
Fair Value $ 0  
Investment, Identifier [Axis]: Corfin Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 5.06% [1],[3],[6] 3.88% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 192,311  
Ending balance 260,802 [1],[3],[6] $ 192,311 [2],[7],[11]
Investment, Identifier [Axis]: Corfin Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[11],[13]   1.34%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 66,500  
Ending balance [2],[11],[13]   $ 66,500
Investment, Identifier [Axis]: Coupa Software Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.04% [1],[3],[4],[5],[6],[20] 0.04% [2],[7],[8],[9],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[10],[11] $ 1,819  
Ending balance 1,834 [1],[3],[4],[5],[6],[20] $ 1,819 [2],[7],[8],[9],[10],[11]
Investment, Identifier [Axis]: Coupa Software Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 164 164
Fair Value (2) (2)
Investment, Identifier [Axis]: Coupa Software Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 126 126
Fair Value $ 0 $ (1)
Investment, Identifier [Axis]: Crewline Buyer, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.16% [1],[4],[6],[12],[20] 1.18% [2],[8],[10],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[10],[11],[13] $ 58,282  
Ending balance 59,621 [1],[4],[6],[12],[20] $ 58,282 [2],[8],[10],[11],[13]
Investment, Identifier [Axis]: Crewline Buyer, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 6,438 6,438
Fair Value $ (16) $ (156)
Investment, Identifier [Axis]: Cumming Group, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.55% [1],[4],[6],[12] 1.59% [2],[8],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[11],[13] $ 78,670  
Ending balance $ 79,857 [1],[4],[6],[12] $ 78,670 [2],[8],[11],[13]
Investment, Identifier [Axis]: Cumming Group, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.19% [1],[4],[6],[12] 0.19% [2],[8],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[11],[13] $ 9,448  
Ending balance 9,566 [1],[4],[6],[12] $ 9,448 [2],[8],[11],[13]
Investment, Identifier [Axis]: Cumming Group, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 8,063 8,063
Fair Value (60) (60)
Investment, Identifier [Axis]: Cumming Group, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 12,695 12,695
Fair Value $ 0 $ (190)
Investment, Identifier [Axis]: CustomInk, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 3.17% [1],[6],[12],[24] 3.30% [2],[11],[13],[22]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13],[22] $ 163,594  
Ending balance $ 163,594 [1],[6],[12],[24] $ 163,594 [2],[11],[13],[22]
Investment, Identifier [Axis]: CustomInk, LLC - Series A Preferred Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.14% [1],[6] 0.14% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 7,171  
Ending balance $ 7,171 [1],[6] $ 7,171 [2],[11]
Investment, Identifier [Axis]: DCA Investment Holdings, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.64% [1],[3],[6] 0.66% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 32,620  
Ending balance $ 32,777 [1],[3],[6] $ 32,620 [2],[7],[11]
Investment, Identifier [Axis]: DCA Investment Holdings, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.02% [1],[3],[6] 0.02% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 990  
Ending balance $ 993 [1],[3],[6] $ 990 [2],[7],[11]
Investment, Identifier [Axis]: DTA Intermediate II Ltd.    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[4],[6],[12] 0.87%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[4],[6],[12] $ 45,069  
Investment, Identifier [Axis]: DTA Intermediate II Ltd., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 16,154  
Fair Value (162)  
Investment, Identifier [Axis]: DTA Intermediate II Ltd., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 7,538  
Fair Value $ 0  
Investment, Identifier [Axis]: DTA LP - Class A Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1] $ 2,171  
Investment, Identifier [Axis]: Dana Kepner Company, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[11],[13]   1.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 49,700  
Ending balance [2],[11],[13]   $ 49,700
Investment, Identifier [Axis]: Daylight Beta Parent LLC (Benefytt Technologies, Inc.)    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.05% [1],[6],[14],[23] 0.11% [2],[11],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[15] $ 5,419  
Ending balance $ 2,813 [1],[6],[14],[23] $ 5,419 [2],[11],[15]
Investment, Identifier [Axis]: Denali Bidco Ltd 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.10% [1],[3],[5],[6],[20] 0.06% [2],[7],[8],[9],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[10],[11] $ 2,783  
Ending balance $ 5,077 [1],[3],[5],[6],[20] $ 2,783 [2],[7],[8],[9],[10],[11]
Investment, Identifier [Axis]: Denali Bidco Ltd 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.02% [1],[4],[5],[6],[14],[20] 0.03% [2],[9],[10],[11],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[10],[11],[15] $ 1,268  
Ending balance 1,236 [1],[4],[5],[6],[14],[20] $ 1,268 [2],[9],[10],[11],[15]
Investment, Identifier [Axis]: Denali Bidco Ltd, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 1,761 1,761
Fair Value 0 $ (3)
Investment, Identifier [Axis]: Descartes Holdings, Inc    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[11]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 102  
Ending balance [2],[11]   $ 102
Investment, Identifier [Axis]: Descartes Holdings, Inc - Class A Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[6] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[6] $ 79  
Investment, Identifier [Axis]: Diligent Corporation    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.13% [1],[6],[12] 1.18% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 58,350  
Ending balance $ 58,200 [1],[6],[12] $ 58,350 [2],[11],[13]
Investment, Identifier [Axis]: Discovery Education, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.07% [1],[6],[12] 0.07% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 3,575  
Ending balance $ 3,566 [1],[6],[12] $ 3,575 [2],[11],[13]
Investment, Identifier [Axis]: Discovery Education, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.67% [1],[3],[6] 0.64% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 31,648  
Ending balance $ 34,527 [1],[3],[6] $ 31,648 [2],[7],[8],[11]
Investment, Identifier [Axis]: Discovery Education, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   2,960
Fair Value   $ (118)
Investment, Identifier [Axis]: Doc Generici (Diocle S.p.A.)    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.02% [1],[4],[5],[6],[14],[20] 0.03% [2]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2] $ 1,349  
Ending balance 1,281 [1],[4],[5],[6],[14],[20] $ 1,349 [2]
Investment, Identifier [Axis]: Doc Generici (Diocle S.p.A.), Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 1,682 1,682
Fair Value $ (616) $ (591)
Investment, Identifier [Axis]: Donuts, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 6.17% [1],[6],[12] 6.45% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 319,179  
Ending balance $ 318,356 [1],[6],[12] $ 319,179 [2],[11],[13]
Investment, Identifier [Axis]: EIS Acquisition Holdings, LP - Class A Common Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.24% [1],[6] 0.27% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 13,455  
Ending balance $ 12,203 [1],[6] $ 13,455 [2],[11]
Investment, Identifier [Axis]: ENV Bidco AB 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.02% [1],[3],[6] 0.02% [2],[7],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[10],[11] $ 1,001  
Ending balance $ 1,006 [1],[3],[6] $ 1,001 [2],[7],[10],[11]
Investment, Identifier [Axis]: ENV Bidco AB 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.02% [1],[3],[6],[20] 0.02% [2],[8],[9],[10],[11],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[9],[10],[11],[15] $ 1,079  
Ending balance 1,051 [1],[3],[6],[20] $ 1,079 [2],[8],[9],[10],[11],[15]
Investment, Identifier [Axis]: ENV Bidco AB, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 433 433
Fair Value $ (159) $ (153)
Investment, Identifier [Axis]: Eagle Midstream Canada Finance, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.26% [1],[3],[6],[20] 1.31% [2]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2] $ 65,109  
Ending balance $ 65,109 [1],[3],[6],[20] $ 65,109 [2]
Investment, Identifier [Axis]: Edifecs, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.26% [1],[3],[6] 0.27% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 13,447  
Ending balance $ 13,447 [1],[3],[6] $ 13,447 [2],[7],[11]
Investment, Identifier [Axis]: Edifecs, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 4.21% [1],[6],[12] 4.38% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 216,910  
Ending balance $ 216,907 [1],[6],[12] $ 216,910 [2],[11],[13]
Investment, Identifier [Axis]: Emergency Power Holdings, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.93% [1],[4],[5],[6],[12] 0.93% [2],[8],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[9],[11],[13] $ 46,064  
Ending balance 47,830 [1],[4],[5],[6],[12] $ 46,064 [2],[8],[9],[11],[13]
Investment, Identifier [Axis]: Emergency Power Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 14,586 16,456
Fair Value $ (146) $ (165)
Investment, Identifier [Axis]: Endeavor Schools Holdings LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.42% [1],[6],[12] 0.44% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 21,796  
Ending balance $ 21,741 [1],[6],[12] $ 21,796 [2],[11],[13]
Investment, Identifier [Axis]: Endeavor Schools Holdings LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.08% [1],[4],[6],[12] 0.08% [2],[8],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[11],[13] $ 3,944  
Ending balance 3,934 [1],[4],[6],[12] $ 3,944 [2],[8],[11],[13]
Investment, Identifier [Axis]: Endeavor Schools Holdings LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 5,776 5,776
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Episerver, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.18% [1],[4],[5],[6],[12] 0.18% [2],[8],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[9],[11],[13] $ 9,081  
Ending balance 9,289 [1],[4],[5],[6],[12] $ 9,081 [2],[8],[9],[11],[13]
Investment, Identifier [Axis]: Episerver, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,064 2,064
Fair Value $ (41) $ (83)
Investment, Identifier [Axis]: Epoch Acquisition, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.46% [1],[6],[12] 0.48% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 23,934  
Ending balance $ 23,871 [1],[6],[12] $ 23,934 [2],[11],[13]
Investment, Identifier [Axis]: Ergomed Plc    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.33% [1],[3],[4],[6],[20] 0.43% [2]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2] $ 21,260  
Ending balance 17,230 [1],[3],[4],[6],[20] $ 21,260 [2]
Investment, Identifier [Axis]: Ergomed Plc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 43,368 46,934
Fair Value $ (3,005) $ 0
Investment, Identifier [Axis]: Expedition Holdco, LLC - Class A Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.00% [1],[6] 0.00% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 40  
Ending balance $ 39 [1],[6] $ 40 [2],[11]
Investment, Identifier [Axis]: Expedition Holdco, LLC - Class B Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.00% [1],[6] 0.00% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 11  
Ending balance $ 8 [1],[6] $ 11 [2],[11]
Investment, Identifier [Axis]: Experity, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.28% [1],[3],[4],[6] 0.30% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 14,664  
Ending balance 14,664 [1],[3],[4],[6] $ 14,664 [2],[7],[8],[11]
Investment, Identifier [Axis]: Experity, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,495 1,495
Fair Value $ (15) $ (15)
Investment, Identifier [Axis]: Fencing Supply Group Acquisition, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.03% [1],[4],[6],[12] 1.06% [2],[8],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[11],[13] $ 52,735  
Ending balance $ 52,891 [1],[4],[6],[12] $ 52,735 [2],[8],[11],[13]
Investment, Identifier [Axis]: Fencing Supply Group Acquisition, LLC, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments   1,910
Fair Value   (24)
Investment, Identifier [Axis]: Fencing Supply Group Acquisition, LLC, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments   1,637
Fair Value   $ 0
Investment, Identifier [Axis]: Formulations Parent Corp.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.17% [1],[3],[4],[6],[20] 0.17% [2],[7],[8],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[10],[11] $ 8,386  
Ending balance 8,521 [1],[3],[4],[6],[20] $ 8,386 [2],[7],[8],[10],[11]
Investment, Identifier [Axis]: Formulations Parent Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,429 1,429
Fair Value (7) $ (26)
Investment, Identifier [Axis]: Foundation Risk Partners Corp.    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[8],[11]   0.32%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 15,880  
Ending balance [2],[7],[8],[11]   $ 15,880
Investment, Identifier [Axis]: Foundation Risk Partners Corp. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[6] 0.31%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[6] $ 15,908  
Investment, Identifier [Axis]: Foundation Risk Partners Corp. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[6] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[6] $ 1,938  
Investment, Identifier [Axis]: Foundation Risk Partners Corp., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 4,913 6,920
Fair Value 0 (69)
Investment, Identifier [Axis]: Foundation Risk Partners Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,382 2,382
Fair Value $ (36) (36)
Investment, Identifier [Axis]: Freya Bidco Limited, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments   257
Fair Value   0
Investment, Identifier [Axis]: Freya Bidco Limited, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments   257
Fair Value   0
Investment, Identifier [Axis]: Freya Bidco Limited, Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments   1,009
Fair Value   0
Investment, Identifier [Axis]: Freya Bidco Limited, Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments   1,107
Fair Value   $ 0
Investment, Identifier [Axis]: Freya Bidco, Ltd. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[4],[6],[14],[20] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[4],[6],[14],[20] $ 1,115  
Investment, Identifier [Axis]: Freya Bidco, Ltd. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[6],[20] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[6],[20] $ 1,006  
Investment, Identifier [Axis]: Freya Bidco, Ltd., Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 260  
Fair Value (3)  
Investment, Identifier [Axis]: Freya Bidco, Ltd., Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 218  
Fair Value $ 0  
Investment, Identifier [Axis]: Frontgrade Technologies Holdings, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.05% [1],[3],[4],[5],[6] 0.05% [2],[7],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] $ 2,370  
Ending balance 2,364 [1],[3],[4],[5],[6] $ 2,370 [2],[7],[8],[9],[11]
Investment, Identifier [Axis]: Frontgrade Technologies Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 516 516
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Frontline Road Safety Investments, LLC - Class A Common Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.10% [1],[6] 0.08% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 3,776  
Ending balance $ 4,939 [1],[6] $ 3,776 [2],[11]
Investment, Identifier [Axis]: Frontline Road Safety, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[6] 1.96%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[6] $ 100,814  
Investment, Identifier [Axis]: Frontline Road Safety, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[8]   1.77%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8] 87,637  
Ending balance [2],[7],[8]   $ 87,637
Investment, Identifier [Axis]: Frontline Road Safety, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7]   0.22%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7] 10,831  
Ending balance [2],[7]   $ 10,831
Investment, Identifier [Axis]: Frontline Road Safety, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 9,897 10,996
Fair Value $ 0 $ (137)
Investment, Identifier [Axis]: FusionSite Midco, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.49% [1],[4],[6],[12] 0.51% [2],[8],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[11],[13] $ 25,334  
Ending balance $ 25,270 [1],[4],[6],[12] $ 25,334 [2],[8],[11],[13]
Investment, Identifier [Axis]: FusionSite Midco, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.18% [1],[4],[6],[12] 0.05% [2],[8],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[11],[13] $ 2,231  
Ending balance 9,074 [1],[4],[6],[12] $ 2,231 [2],[8],[11],[13]
Investment, Identifier [Axis]: FusionSite Midco, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 1,851 8,800
Fair Value 0 0
Investment, Identifier [Axis]: FusionSite Midco, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,791 2,791
Fair Value $ (63) $ (63)
Investment, Identifier [Axis]: G&A Partners Holding Company II, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[4],[6],[16] 0.57%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[4],[6],[16] $ 29,444  
Investment, Identifier [Axis]: G&A Partners Holding Company II, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 13,151  
Fair Value 0  
Investment, Identifier [Axis]: G&A Partners Holding Company II, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,288  
Fair Value $ (66)  
Investment, Identifier [Axis]: GCX Corporation Buyer, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.41% [1],[3],[5],[6] 0.43% [2],[7],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[11] $ 21,182  
Ending balance $ 21,128 [1],[3],[5],[6] $ 21,182 [2],[7],[9],[11]
Investment, Identifier [Axis]: GCX Corporation Buyer, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.10% [1],[3],[5],[6] 0.11% [2],[7],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[11] $ 5,363  
Ending balance $ 5,350 [1],[3],[5],[6] $ 5,363 [2],[7],[9],[11]
Investment, Identifier [Axis]: GCX Corporation Group Holdings, L.P. - Class A-2 Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.01% [1],[6] 0.01% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 302  
Ending balance 318 [1],[6] $ 302 [2],[11]
Investment, Identifier [Axis]: GGW Group GmbH, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 13,290  
Fair Value 0  
Investment, Identifier [Axis]: GGW Group GmbH, Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 32,209  
Fair Value $ 0  
Investment, Identifier [Axis]: GI Consilio Parent, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.00% [1],[4],[5],[6],[14] 0.01% [2],[8],[9],[11],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[9],[11],[15] $ 554  
Ending balance 235 [1],[4],[5],[6],[14] $ 554 [2],[8],[9],[11],[15]
Investment, Identifier [Axis]: GI Consilio Parent, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,922 561
Fair Value $ (41) $ 0
Investment, Identifier [Axis]: GI Ranger Intermediate, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[6] 0.32%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[6] $ 16,427  
Investment, Identifier [Axis]: GI Ranger Intermediate, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[8],[11]   0.32%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] 15,726  
Ending balance [2],[7],[8],[11]   $ 15,726
Investment, Identifier [Axis]: GI Ranger Intermediate, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[8],[11]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] 720  
Ending balance [2],[7],[8],[11]   $ 720
Investment, Identifier [Axis]: GI Ranger Intermediate, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   3,040
Fair Value   0
Investment, Identifier [Axis]: GI Ranger Intermediate, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,200 480
Fair Value 0 $ 0
Investment, Identifier [Axis]: GS Acquisitionco, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 8,000  
Fair Value (20)  
Investment, Identifier [Axis]: GS Acquisitionco, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,000  
Fair Value $ (10)  
Investment, Identifier [Axis]: GTCR Investors LP - A-1 Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.01% [1],[6] 0.01% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 417  
Ending balance 417 [1],[6] $ 417 [2],[11]
Investment, Identifier [Axis]: Galway Borrower, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[8],[9],[11]   0.24%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] $ 12,032  
Ending balance [2],[7],[8],[9],[11]   $ 12,032
Investment, Identifier [Axis]: Galway Borrower, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[5],[6] 0.23%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[5],[6] $ 11,922  
Investment, Identifier [Axis]: Galway Borrower, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[5],[6] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[5],[6] $ 1,394  
Investment, Identifier [Axis]: Galway Borrower, LLC, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 7  
Fair Value 0  
Investment, Identifier [Axis]: Galway Borrower, LLC, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 52,753  
Fair Value (264)  
Investment, Identifier [Axis]: Galway Borrower, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 7,344 2,120
Fair Value $ 0 $ (32)
Investment, Identifier [Axis]: Genuine Cable Group, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 3.15% [1],[3],[6] 3.31% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 164,014  
Ending balance $ 162,337 [1],[3],[6] $ 164,014 [2],[7],[11]
Investment, Identifier [Axis]: Gigamon Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.14% [1],[4],[6],[12] 0.15% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 7,308  
Ending balance 7,308 [1],[4],[6],[12] $ 7,308 [2],[7],[8],[11]
Investment, Identifier [Axis]: Gigamon Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 437 437
Fair Value $ 0 $ (1)
Investment, Identifier [Axis]: Go Car Wash Management Corp.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.42% [1],[6],[12] 0.44% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 21,941  
Ending balance $ 21,885 [1],[6],[12] $ 21,941 [2],[11],[13]
Investment, Identifier [Axis]: GovernmentJobs.com, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.10% [1],[3],[4],[6] 0.10% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 5,156  
Ending balance 5,142 [1],[3],[4],[6] $ 5,156 [2],[7],[8],[11]
Investment, Identifier [Axis]: GovernmentJobs.com, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 677 677
Fair Value $ (14) $ (14)
Investment, Identifier [Axis]: Granicus, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[6] 0.33%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[6] $ 17,095  
Investment, Identifier [Axis]: Granicus, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 2,583  
Fair Value (13)  
Investment, Identifier [Axis]: Granicus, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,448  
Fair Value $ (6)  
Investment, Identifier [Axis]: GraphPAD Software, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.26% [1],[6],[12] 0.27% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 13,518  
Ending balance $ 13,483 [1],[6],[12] $ 13,518 [2],[11],[13]
Investment, Identifier [Axis]: GraphPAD Software, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.25% [1],[6],[12] 0.26% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 12,797  
Ending balance $ 12,764 [1],[6],[12] $ 12,797 [2],[11],[13]
Investment, Identifier [Axis]: GraphPAD Software, LLC 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.12% [1],[6],[12] 0.13% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 6,429  
Ending balance $ 6,429 [1],[6],[12] $ 6,429 [2],[11],[13]
Investment, Identifier [Axis]: GraphPAD Software, LLC 4    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.04% [1],[6],[12] 0.02% [2],[8],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[11],[13] $ 1,030  
Ending balance 2,124 [1],[6],[12] $ 1,030 [2],[8],[11],[13]
Investment, Identifier [Axis]: GraphPAD Software, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   1,062
Fair Value   $ 0
Investment, Identifier [Axis]: Groundworks, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[8],[9],[11],[13]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[9],[11],[13] $ 802  
Ending balance [2],[8],[9],[11],[13]   $ 802
Investment, Identifier [Axis]: Groundworks, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   37
Fair Value   0
Investment, Identifier [Axis]: Groundworks, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   42
Fair Value   $ (1)
Investment, Identifier [Axis]: Guidehouse, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 5.95% [1],[3],[6] 6.13% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 303,558  
Ending balance $ 307,007 [1],[3],[6] $ 303,558 [2],[7],[11]
Investment, Identifier [Axis]: Gusto Sing Bidco Pte Ltd    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[6],[20] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[6],[20] $ 629  
Investment, Identifier [Axis]: Gusto Sing Bidco Pte Ltd, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 101  
Fair Value $ 0  
Investment, Identifier [Axis]: HIG Orca Acquisition Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.37% [1],[4],[5],[6],[12] 0.39% [2],[8],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[9],[11],[13] $ 19,091  
Ending balance $ 19,043 [1],[4],[5],[6],[12] $ 19,091 [2],[8],[9],[11],[13]
Investment, Identifier [Axis]: HIG Orca Acquisition Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.06% [1],[5],[6],[12] 0.06% [2],[8],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[9],[11],[13] $ 2,877  
Ending balance 2,932 [1],[5],[6],[12] $ 2,877 [2],[8],[9],[11],[13]
Investment, Identifier [Axis]: HIG Orca Acquisition Holdings, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   3,241
Fair Value   0
Investment, Identifier [Axis]: HIG Orca Acquisition Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,961 2,961
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Healthcomp Holding Company, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.20% [1],[6],[14] 1.97% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 97,515  
Ending balance $ 10,289 [1],[6],[14] $ 97,515 [2],[7],[11]
Investment, Identifier [Axis]: Healthcomp Holding Company, LLC - Preferred Interest    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.02% [1],[6],[20] 0.02% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 985  
Ending balance 985 [1],[6],[20] $ 985 [2],[11]
Investment, Identifier [Axis]: Healthcomp Holding Company, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[11],[15]   0.20%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[15] $ 9,924  
Ending balance [2],[11],[15]   $ 9,924
Investment, Identifier [Axis]: Healthcomp Holding Company, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[6] 1.92%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[6] $ 98,759  
Investment, Identifier [Axis]: Helix TS, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.40% [1],[3],[6] 0.90% [2],[7]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7] $ 44,672  
Ending balance $ 20,816 [1],[3],[6] $ 44,672 [2],[7]
Investment, Identifier [Axis]: Helix TS, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.49% [1],[3],[6] 0.02% [2],[7],[8]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8] $ 973  
Ending balance $ 25,178 [1],[3],[6] $ 973 [2],[7],[8]
Investment, Identifier [Axis]: High Street Buyer, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.01% [1],[3],[4],[5],[6] 1.06% [2],[7],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[11] $ 52,366  
Ending balance $ 52,022 [1],[3],[4],[5],[6] $ 52,366 [2],[7],[9],[11]
Investment, Identifier [Axis]: High Street Buyer, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.24% [1],[3],[4],[5],[6] 0.23% [2],[7],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] $ 11,146  
Ending balance 12,132 [1],[3],[4],[5],[6] $ 11,146 [2],[7],[8],[9],[11]
Investment, Identifier [Axis]: High Street Buyer, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   9,396
Fair Value   0
Investment, Identifier [Axis]: High Street Buyer, Inc., Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 17,398  
Fair Value 0  
Investment, Identifier [Axis]: High Street Buyer, Inc., Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 20,953  
Fair Value (210)  
Investment, Identifier [Axis]: High Street Buyer, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,254 2,254
Fair Value $ (45) $ (45)
Investment, Identifier [Axis]: IG Investments Holdings, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.89% [1],[3],[4],[5],[6] 0.93% [2],[7],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] $ 46,011  
Ending balance 46,142 [1],[3],[4],[5],[6] $ 46,011 [2],[7],[8],[9],[11]
Investment, Identifier [Axis]: IG Investments Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,583 3,583
Fair Value 0 $ (18)
Investment, Identifier [Axis]: ISQ Hawkeye Holdco, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[8],[11]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 934  
Ending balance [2],[7],[8],[11]   $ 934
Investment, Identifier [Axis]: ISQ Hawkeye Holdco, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[6] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[6] $ 932  
Investment, Identifier [Axis]: ISQ Hawkeye Holdco, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[6] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[6] $ 45  
Investment, Identifier [Axis]: ISQ Hawkeye Holdco, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 51 51
Fair Value 0 0
Investment, Identifier [Axis]: ISQ Hawkeye Holdco, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 45 91
Fair Value $ 0 0
Investment, Identifier [Axis]: Icefall Parent Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   3,042
Fair Value   0
Investment, Identifier [Axis]: Icefall Parent Inc, Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   31,940
Fair Value   $ 0
Investment, Identifier [Axis]: Icefall Parent, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[4],[6],[12] 0.62%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[4],[6],[12] $ 31,878  
Investment, Identifier [Axis]: Icefall Parent, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,104  
Fair Value $ (62)  
Investment, Identifier [Axis]: Infostretch Corporation    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.09% [1],[3],[5],[6] 0.09% [2],[7],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[11] $ 4,408  
Ending balance $ 4,397 [1],[3],[5],[6] $ 4,408 [2],[7],[9],[11]
Investment, Identifier [Axis]: Inova Pharmaceutical, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   102
Fair Value   0
Investment, Identifier [Axis]: Inova Pharmaceutical, Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   661
Fair Value   $ 0
Investment, Identifier [Axis]: Inovalon Holdings, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.24% [1],[3],[6] 2.21% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 109,329  
Ending balance $ 12,474 [1],[3],[6] $ 109,329 [2],[7],[8],[11]
Investment, Identifier [Axis]: Inovalon Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 2.13% [1],[3],[6] 0.25% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 12,293  
Ending balance $ 109,726 [1],[3],[6] $ 12,293 [2],[7],[11]
Investment, Identifier [Axis]: Inovalon Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[6] 0.09%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[6] $ 4,816  
Investment, Identifier [Axis]: Inovalon Holdings, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 6,106 11,060
Fair Value $ 0 $ (138)
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 2.68% [1],[4],[5],[6],[12] 0.02% [2],[7],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] $ 1,098  
Ending balance $ 138,377 [1],[4],[5],[6],[12] $ 1,098 [2],[7],[8],[9],[11]
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.04% [1],[3],[5],[6] 0.08% [2],[7],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[11] $ 3,998  
Ending balance $ 1,866 [1],[3],[5],[6] $ 3,998 [2],[7],[9],[11]
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.02% [1],[3],[4],[5],[6] 2.79% [2],[7],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] $ 138,022  
Ending balance $ 1,186 [1],[3],[4],[5],[6] $ 138,022 [2],[7],[8],[9],[11]
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC 4    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.08% [1],[3],[5],[6] 0.04% [2],[7],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[11] $ 1,862  
Ending balance 4,008 [1],[3],[5],[6] $ 1,862 [2],[7],[9],[11]
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 17,064 17,064
Fair Value 0 0
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,381 1,381
Fair Value $ (7) $ (14)
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% 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 Bidco Ltd, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments $ 16,002  
Fair Value 0  
Investment, Identifier [Axis]: Iris Bidco Ltd, Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 30,251  
Fair Value $ 0  
Investment, Identifier [Axis]: Iris Buyer, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.54% [1],[4],[6],[12] 0.51% [2],[8],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[11],[13] $ 25,377  
Ending balance 27,735 [1],[4],[6],[12] $ 25,377 [2],[8],[11],[13]
Investment, Identifier [Axis]: Iris Buyer, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 1,426 3,318
Fair Value 0 0
Investment, Identifier [Axis]: Iris Buyer, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,673 3,673
Fair Value $ (101) $ (101)
Investment, Identifier [Axis]: Italian Motorway Holdings S.à.r.l    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.65% [1],[5],[6],[14],[20] 1.74% [2],[9],[10],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[10],[15] $ 86,349  
Ending balance $ 85,024 [1],[5],[6],[14],[20] $ 86,349 [2],[9],[10],[15]
Investment, Identifier [Axis]: JSS Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 5.57% [1],[3],[6] 5.72% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 283,010  
Ending balance 287,159 [1],[3],[6] $ 283,010 [2],[7],[11]
Investment, Identifier [Axis]: JSS Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[11]   0.10%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 4,888  
Ending balance [2],[7],[11]   $ 4,888
Investment, Identifier [Axis]: Jacuzzi Brands, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.20% [1],[3],[6] 0.21% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 10,215  
Ending balance $ 10,215 [1],[3],[6] $ 10,215 [2],[7],[11]
Investment, Identifier [Axis]: Jacuzzi Brands, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.36% [1],[6],[12] 1.42% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 70,275  
Ending balance $ 70,275 [1],[6],[12] $ 70,275 [2],[11],[13]
Investment, Identifier [Axis]: Java Buyer, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.08% [1],[3],[6] 0.12% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 5,919  
Ending balance $ 4,026 [1],[3],[6] $ 5,919 [2],[7],[8],[11]
Investment, Identifier [Axis]: Java Buyer, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.01% [1],[3],[4],[6] 0.01% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 353  
Ending balance $ 353 [1],[3],[4],[6] $ 353 [2],[7],[8],[11]
Investment, Identifier [Axis]: Java Buyer, Inc. 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[6] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[6] $ 1,894  
Investment, Identifier [Axis]: Java Buyer, Inc., Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 930 930
Fair Value 0 0
Investment, Identifier [Axis]: Java Buyer, Inc., Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 1,276 1,276
Fair Value $ (13) $ 0
Investment, Identifier [Axis]: Jayhawk Buyer, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 2.82% [1],[6],[12] 2.96% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 146,766  
Ending balance 145,615 [1],[6],[12] $ 146,766 [2],[11],[13]
Investment, Identifier [Axis]: Jayhawk Buyer, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[11],[13]   0.10%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 4,950  
Ending balance [2],[11],[13]   $ 4,950
Investment, Identifier [Axis]: Jayhawk Buyer, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[6],[12] 0.10%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[6],[12] $ 4,924  
Investment, Identifier [Axis]: Jayhawk Holdings, LP - A-1 Common Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.00% [1],[6] 0.00% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 172  
Ending balance $ 152 [1],[6] $ 172 [2],[11]
Investment, Identifier [Axis]: Jayhawk Holdings, LP - A-2 Common Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.00% [1],[6] 0.00% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 93  
Ending balance $ 82 [1],[6] $ 93 [2],[11]
Investment, Identifier [Axis]: KKR Alberta Midsteam Finance Inc    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.69% [1],[3],[6],[20] 0.72% [2]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2] $ 35,421  
Ending balance $ 35,421 [1],[3],[6],[20] $ 35,421 [2]
Investment, Identifier [Axis]: KPSKY Acquisition, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.39% [1],[3],[6],[24] 0.40% [2],[7],[11],[22]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11],[22] $ 20,014  
Ending balance $ 19,962 [1],[3],[6],[24] $ 20,014 [2],[7],[11],[22]
Investment, Identifier [Axis]: KPSKY Acquisition, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.04% [1],[3],[6],[24] 0.05% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 2,305  
Ending balance 2,299 [1],[3],[6],[24] $ 2,305 [2],[7],[11]
Investment, Identifier [Axis]: Kattegat Project Bidco AB, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 6,923  
Fair Value 0  
Investment, Identifier [Axis]: Kattegat Project Bidco AB, Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 33,905  
Fair Value $ 0  
Investment, Identifier [Axis]: Kaufman Hall & Associates, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.47% [1],[3],[6] 0.49% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 24,082  
Ending balance $ 24,020 [1],[3],[6] $ 24,082 [2],[7],[11]
Investment, Identifier [Axis]: Knowledge Pro Buyer, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.13% [1],[3],[4],[6] 0.12% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 6,078  
Ending balance 6,648 [1],[3],[4],[6] $ 6,078 [2],[7],[8],[11]
Investment, Identifier [Axis]: Knowledge Pro Buyer, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 2,334 2,633
Fair Value 0 0
Investment, Identifier [Axis]: Knowledge Pro Buyer, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 495 784
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Kwol Acquisition, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.13% [1],[3],[4],[6],[20] 0.13% [2],[7],[8],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[10],[11] $ 6,685  
Ending balance 6,547 [1],[3],[4],[6],[20] $ 6,685 [2],[7],[8],[10],[11]
Investment, Identifier [Axis]: Kwol Acquisition, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 897 628
Fair Value $ (7) $ 0
Investment, Identifier [Axis]: L&S Mechanical Acquisition, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.24% [1],[3],[5],[6] 0.24% [2],[7],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[11] $ 12,006  
Ending balance $ 12,351 [1],[3],[5],[6] $ 12,006 [2],[7],[9],[11]
Investment, Identifier [Axis]: LD Lower Holdings, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.76% [1],[6],[12] 1.83% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 90,602  
Ending balance $ 90,598 [1],[6],[12] $ 90,602 [2],[11],[13]
Investment, Identifier [Axis]: LPW Group Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[6],[12] 0.51%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[6],[12] $ 26,191  
Investment, Identifier [Axis]: LPW Group Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[4],[6],[12] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[4],[6],[12] $ 1,209  
Investment, Identifier [Axis]: LPW Group Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 4,029  
Fair Value 0  
Investment, Identifier [Axis]: Legacy Intermediate, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[11]   0.14%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 6,766  
Ending balance [2],[7],[11]   $ 6,766
Investment, Identifier [Axis]: Legacy Intermediate, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[6] 0.13%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[6] $ 6,749  
Investment, Identifier [Axis]: Legacy Intermediate, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[6],[16] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[6],[16] $ 1,300  
Investment, Identifier [Axis]: Lightbox Intermediate, LP    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.04% [1],[5],[6],[14] 0.04% [2],[9],[11],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[11],[15] $ 1,886  
Ending balance $ 1,881 [1],[5],[6],[14] $ 1,886 [2],[9],[11],[15]
Investment, Identifier [Axis]: Lindstrom, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 2.30% [1],[6],[12] 2.40% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 119,016  
Ending balance $ 118,773 [1],[6],[12] $ 119,016 [2],[11],[13]
Investment, Identifier [Axis]: Linquest Corp.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.19% [1],[3],[5],[6] 0.19% [2],[7],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[11] $ 9,592  
Ending balance $ 9,568 [1],[3],[5],[6] $ 9,592 [2],[7],[9],[11]
Investment, Identifier [Axis]: Livingston International, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 2.31% [1],[4],[5],[6],[14],[20] 2.44% [2],[7],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[10],[11] $ 120,848  
Ending balance $ 119,103 [1],[4],[5],[6],[14],[20] $ 120,848 [2],[7],[10],[11]
Investment, Identifier [Axis]: Lobos Parent, Inc. - Series A Preferred Shares    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.04% [1],[6] 0.04% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 1,819  
Ending balance $ 1,869 [1],[6] $ 1,819 [2],[11]
Investment, Identifier [Axis]: Lytx, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.64% [1],[6],[12] 1.71% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 84,454  
Ending balance $ 84,454 [1],[6],[12] $ 84,454 [2],[11],[13]
Investment, Identifier [Axis]: MAG DS Corp.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.49% [1],[12] 1.56% [2],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[13] $ 77,290  
Ending balance $ 77,012 [1],[12] $ 77,290 [2],[13]
Investment, Identifier [Axis]: MB2 Dental Solutions, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[6] 0.45%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[6] $ 23,060  
Investment, Identifier [Axis]: MB2 Dental Solutions, LLC, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 4,952  
Fair Value (16)  
Investment, Identifier [Axis]: MB2 Dental Solutions, LLC, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 8,253  
Fair Value (13)  
Investment, Identifier [Axis]: MB2 Dental Solutions, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,382  
Fair Value $ (14)  
Investment, Identifier [Axis]: MHE Intermediate Holdings, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.05% [1],[4],[5],[6],[12] 0.05% [2],[8],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[9],[11],[13] $ 2,559  
Ending balance $ 2,463 [1],[4],[5],[6],[12] $ 2,559 [2],[8],[9],[11],[13]
Investment, Identifier [Axis]: MHE Intermediate Holdings, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.00% [1],[5],[6],[12] 0.01% [2],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[11],[13] $ 249  
Ending balance $ 118 [1],[5],[6],[12] $ 249 [2],[9],[11],[13]
Investment, Identifier [Axis]: MHE Intermediate Holdings, LLC 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[5],[6],[12] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[5],[6],[12] $ 118  
Investment, Identifier [Axis]: MHE Intermediate Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 268 268
Fair Value $ 0 0
Investment, Identifier [Axis]: MPG Parent Holdings LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   2,679
Fair Value   0
Investment, Identifier [Axis]: MPG Parent Holdings LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   1,313
Fair Value   0
Investment, Identifier [Axis]: MPG Parent Holdings LLC, Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   10,763
Fair Value   $ 0
Investment, Identifier [Axis]: MPG Parent Holdings, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[4],[6],[12] 0.21%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[4],[6],[12] $ 10,655  
Investment, Identifier [Axis]: MPG Parent Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 2,679  
Fair Value (54)  
Investment, Identifier [Axis]: MPG Parent Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,339  
Fair Value $ (27)  
Investment, Identifier [Axis]: MRI Software, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.99% [1],[4],[5],[6],[12] 1.02% [2],[8],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[11],[13] $ 50,422  
Ending balance 51,012 [1],[4],[5],[6],[12] $ 50,422 [2],[8],[11],[13]
Investment, Identifier [Axis]: MRI Software, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 40,238 40,238
Fair Value (201) (201)
Investment, Identifier [Axis]: MRI Software, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 7,361  
Fair Value $ (221)  
Investment, Identifier [Axis]: MRI Software, LLC, Revolver 1    
Schedule of Investments [Line Items]    
Unfunded commitments   1,516
Fair Value   (28)
Investment, Identifier [Axis]: MRI Software, LLC, Revolver 2    
Schedule of Investments [Line Items]    
Unfunded commitments   1,822
Fair Value   (3)
Investment, Identifier [Axis]: MRI Software, LLC, Revolver 3    
Schedule of Investments [Line Items]    
Unfunded commitments   4,024
Fair Value   (40)
Investment, Identifier [Axis]: MRI Software, LLC, Revolver 4    
Schedule of Investments [Line Items]    
Unfunded commitments   3,086
Fair Value   $ (34)
Investment, Identifier [Axis]: Magnesium BorrowerCo, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.10% [1],[3],[4],[5],[6] 0.11% [2],[7],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] $ 5,203  
Ending balance $ 5,330 [1],[3],[4],[5],[6] $ 5,203 [2],[7],[8],[9],[11]
Investment, Identifier [Axis]: Magnesium BorrowerCo, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.08% [1],[3],[6] 0.09% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 4,345  
Ending balance 4,291 [1],[3],[6] $ 4,345 [2],[7],[11]
Investment, Identifier [Axis]: Magnesium BorrowerCo, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 328 485
Fair Value $ 0 $ (12)
Investment, Identifier [Axis]: Magneto Components BuyCo, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.64% [1],[3],[4],[6] 0.65% [2],[7],[8],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[10],[11] $ 32,273  
Ending balance 32,758 [1],[3],[4],[6] $ 32,273 [2],[7],[8],[10],[11]
Investment, Identifier [Axis]: Magneto Components BuyCo, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 6,610 6,610
Fair Value (83) 0
Investment, Identifier [Axis]: Magneto Components BuyCo, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 5,508 5,508
Fair Value $ (69) $ (138)
Investment, Identifier [Axis]: Mandolin Technology Holdings, Inc. - Series A Preferred Shares    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.07% [1],[6] 0.07% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 3,568  
Ending balance $ 3,692 [1],[6] $ 3,568 [2],[11]
Investment, Identifier [Axis]: Mandolin Technology Intermediate Holdings, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.01% [1],[4],[5],[6],[14] 0.07% [2],[9],[11],[17]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[11],[17] $ 3,319  
Ending balance $ 571 [1],[4],[5],[6],[14] $ 3,319 [2],[9],[11],[17]
Investment, Identifier [Axis]: Mandolin Technology Intermediate Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.15% [1],[5],[6],[16] 0.16% [2],[9],[11],[17]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[11],[17] $ 7,887  
Ending balance $ 7,909 [1],[5],[6],[16] $ 7,887 [2],[9],[11],[17]
Investment, Identifier [Axis]: Mandolin Technology Intermediate Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.13% [1],[5],[6],[16] 0.14% [2],[9],[11],[17]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[11],[17] $ 6,965  
Ending balance $ 6,948 [1],[5],[6],[16] $ 6,965 [2],[9],[11],[17]
Investment, Identifier [Axis]: Mandolin Technology Intermediate Holdings, Inc. 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.06% [1],[5],[6],[16] 0.00% [2],[8],[9],[11],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[9],[11],[15] $ 194  
Ending balance 3,319 [1],[5],[6],[16] $ 194 [2],[8],[9],[11],[15]
Investment, Identifier [Axis]: Mandolin Technology Intermediate Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 545 916
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Marcone Yellowstone Buyer, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.09% [1],[3],[5],[6] 0.09% [2],[7],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[11] $ 4,606  
Ending balance $ 4,594 [1],[3],[5],[6] $ 4,606 [2],[7],[9],[11]
Investment, Identifier [Axis]: Marcone Yellowstone Buyer, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.03% [1],[3],[4],[5],[6] 0.03% [2],[7],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] $ 1,471  
Ending balance $ 1,467 [1],[3],[4],[5],[6] $ 1,471 [2],[7],[8],[9],[11]
Investment, Identifier [Axis]: Marcone Yellowstone Buyer, Inc. 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.03% [1],[3],[5],[6] 0.03% [2],[7],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[11] $ 1,483  
Ending balance 1,479 [1],[3],[5],[6] $ 1,483 [2],[7],[9],[11]
Investment, Identifier [Axis]: Marcone Yellowstone Buyer, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 342 342
Fair Value (17) $ (17)
Investment, Identifier [Axis]: Material Holdings, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[8],[9],[11]   0.45%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] $ 22,431  
Ending balance [2],[7],[8],[9],[11]   $ 22,431
Investment, Identifier [Axis]: Material Holdings, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[5],[6] 0.40%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[5],[6] $ 20,772  
Investment, Identifier [Axis]: Material Holdings, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[5],[6] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[5],[6] $ 1,206  
Investment, Identifier [Axis]: Material Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 353 848
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Maverick Acquisition, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.27% [1],[6],[12] 0.28% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 13,763  
Ending balance $ 13,728 [1],[6],[12] $ 13,763 [2],[11],[13]
Investment, Identifier [Axis]: Medallia, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[6] 7.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[6] $ 362,478  
Investment, Identifier [Axis]: Medallia, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[11]   7.21%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] 356,796  
Ending balance [2],[7],[11]   $ 356,796
Investment, Identifier [Axis]: Medallia, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[11]   0.04%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 2,094  
Ending balance [2],[7],[11]   $ 2,094
Investment, Identifier [Axis]: Mercury Bidco Globe Limited    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[4],[6] 1.14%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[4],[6] $ 58,617  
Investment, Identifier [Axis]: Mercury Bidco Globe Limited, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 14,933 14,992
Fair Value $ 0 0
Investment, Identifier [Axis]: Mercury Bidco Globe Limited, Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   59,287
Fair Value   $ 0
Investment, Identifier [Axis]: Micross Topco, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.09% [1],[6] 0.09% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 4,699  
Ending balance $ 4,795 [1],[6] $ 4,699 [2],[11]
Investment, Identifier [Axis]: Mimecast Limited    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.01% [1],[6] 0.01% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 674  
Ending balance $ 690 [1],[6] $ 674 [2],[11]
Investment, Identifier [Axis]: Minotaur Acquisition, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.04% [1],[5],[14] 0.04% [2],[9],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[15] $ 1,967  
Ending balance $ 1,963 [1],[5],[14] $ 1,967 [2],[9],[15]
Investment, Identifier [Axis]: Mode Holdings, L.P. - Class A-2 Common Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.19% [1],[6] 0.20% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 9,822  
Ending balance $ 9,822 [1],[6] $ 9,822 [2],[11]
Investment, Identifier [Axis]: Mode Purchaser, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 2.78% [1],[3],[6],[20] 2.89% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 143,110  
Ending balance $ 143,110 [1],[3],[6],[20] $ 143,110 [2],[11],[13]
Investment, Identifier [Axis]: Mode Purchaser, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.08% [1],[6],[12] 0.08% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 4,085  
Ending balance $ 4,085 [1],[6],[12] $ 4,085 [2],[11],[13]
Investment, Identifier [Axis]: Monk Holding Co. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.09% [1],[3],[6],[24] 0.10% [2],[7],[11],[22]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11],[22] $ 4,804  
Ending balance $ 4,792 [1],[3],[6],[24] $ 4,804 [2],[7],[11],[22]
Investment, Identifier [Axis]: Monk Holding Co. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.01% [1],[3],[4],[6] 0.00% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 175  
Ending balance 274 [1],[3],[4],[6] $ 175 [2],[7],[8],[11]
Investment, Identifier [Axis]: Monk Holding Co., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 917 830
Fair Value 0 $ 0
Investment, Identifier [Axis]: Monterey Financing, S.A.R.L 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[9],[10],[11],[15]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[10],[11],[15] 206  
Ending balance [2],[9],[10],[11],[15]   $ 206
Investment, Identifier [Axis]: Monterey Financing, S.A.R.L 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[9],[10],[11],[15]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[10],[11],[15] 721  
Ending balance [2],[9],[10],[11],[15]   $ 721
Investment, Identifier [Axis]: Monterey Financing, S.A.R.L 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[8],[9],[10],[11],[15]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[9],[10],[11],[15] 220  
Ending balance [2],[8],[9],[10],[11],[15]   $ 220
Investment, Identifier [Axis]: Monterey Financing, S.A.R.L 4    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[9],[10],[11],[15]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[10],[11],[15] 708  
Ending balance [2],[9],[10],[11],[15]   $ 708
Investment, Identifier [Axis]: Monterey Financing, S.A.R.L 5    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[9],[10],[11],[17]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[10],[11],[17] $ 503  
Ending balance [2],[9],[10],[11],[17]   $ 503
Investment, Identifier [Axis]: Monterey Financing, S.A.R.L, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   283
Fair Value   $ 0
Investment, Identifier [Axis]: Monterey Financing, S.à r.l. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[5],[6],[14],[20] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[5],[6],[14],[20] $ 194  
Investment, Identifier [Axis]: Monterey Financing, S.à r.l. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[4],[5],[6],[16],[20] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[4],[5],[6],[16],[20] $ 913  
Investment, Identifier [Axis]: Monterey Financing, S.à r.l. 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[5],[6],[14],[20] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[5],[6],[14],[20] $ 692  
Investment, Identifier [Axis]: Monterey Financing, S.à r.l. 4    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[5],[6],[16],[20] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[5],[6],[16],[20] $ 471  
Investment, Identifier [Axis]: Monterey Financing, S.à r.l., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 283  
Fair Value $ 0  
Investment, Identifier [Axis]: More Cowbell II, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.15% [1],[3],[4],[6] 0.16% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 7,866  
Ending balance $ 7,986 [1],[3],[4],[6] $ 7,866 [2],[7],[8],[11]
Investment, Identifier [Axis]: More Cowbell II, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.00% [1],[3],[4],[6] 0.00% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 192  
Ending balance 209 [1],[3],[4],[6] $ 192 [2],[7],[8],[11]
Investment, Identifier [Axis]: More Cowbell II, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 916 871
Fair Value (11) (11)
Investment, Identifier [Axis]: More Cowbell II, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 923 968
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: NAVEX TopCo, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.18% [1],[3],[4],[6] 1.21% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 59,969  
Ending balance 60,969 [1],[3],[4],[6] $ 59,969 [2],[7],[8],[11]
Investment, Identifier [Axis]: NAVEX TopCo, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 5,394 5,394
Fair Value $ (27) $ (108)
Investment, Identifier [Axis]: NC Ocala Co-Invest Beta, L.P. - LP Interest    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.06% [1],[6] 0.06% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 3,054  
Ending balance $ 3,225 [1],[6] $ 3,054 [2],[11]
Investment, Identifier [Axis]: NDC Acquisition Corp. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.26% [1],[6],[12] 0.27% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 13,288  
Ending balance $ 13,388 [1],[6],[12] $ 13,288 [2],[11],[13]
Investment, Identifier [Axis]: NDC Acquisition Corp. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.01% [1],[4],[6],[12] 0.01% [2],[8],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[11],[13] $ 480  
Ending balance 514 [1],[4],[6],[12] $ 480 [2],[8],[11],[13]
Investment, Identifier [Axis]: NDC Acquisition Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,911 2,911
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.38% [1],[3],[6] 1.44% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 71,173  
Ending balance $ 71,173 [1],[3],[6] $ 71,173 [2],[7],[11]
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.29% [1],[3],[6] 0.30% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 14,719  
Ending balance 14,758 [1],[3],[6] $ 14,719 [2],[7],[8],[11]
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   2,617
Fair Value   $ 0
Investment, Identifier [Axis]: Navigator Acquiror, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[8],[11]   4.42%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[11] $ 218,854  
Ending balance [2],[8],[11]   $ 218,854
Investment, Identifier [Axis]: Navigator Acquiror, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[4],[6],[16] 4.38%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[4],[6],[16] $ 225,993  
Investment, Identifier [Axis]: Navigator Acquiror, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 16,497 24,746
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Ncp Helix Holdings, LLC. - Preferred Shares    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.01% [1],[6] 0.01% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 536  
Ending balance $ 629 [1],[6] $ 536 [2],[11]
Investment, Identifier [Axis]: Neptune BidCo    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[4],[6],[14],[20] 0.12%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[4],[6],[14],[20] $ 6,222  
Investment, Identifier [Axis]: Neptune BidCo, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 1,317  
Fair Value 0  
Investment, Identifier [Axis]: Neptune BidCo, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 2,788  
Fair Value $ 0  
Investment, Identifier [Axis]: Neptune Holdings, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.13% [1],[4],[6],[12] 0.14% [2],[8],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[11],[13] $ 6,841  
Ending balance 6,800 [1],[4],[6],[12] $ 6,841 [2],[8],[11],[13]
Investment, Identifier [Axis]: Neptune Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 933 933
Fair Value $ 0 $ (19)
Investment, Identifier [Axis]: Nintex Topco Limited    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.64% [1],[3],[6],[20] 0.66% [2],[7],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[10],[11] $ 32,511  
Ending balance $ 32,885 [1],[3],[6],[20] $ 32,511 [2],[7],[10],[11]
Investment, Identifier [Axis]: OHCP V TC COI, LP. - LP Interest    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.13% [1],[6] 0.12% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 6,055  
Ending balance $ 6,615 [1],[6] $ 6,055 [2],[11]
Investment, Identifier [Axis]: Odyssey Holding Company, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.26% [1],[6],[12],[24] 0.34% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 17,037  
Ending balance $ 13,402 [1],[6],[12],[24] $ 17,037 [2],[11],[13]
Investment, Identifier [Axis]: Odyssey Holding Company, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.10% [1],[6],[12] 0.03% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 1,635  
Ending balance $ 5,270 [1],[6],[12] $ 1,635 [2],[11],[13]
Investment, Identifier [Axis]: Onex Baltimore Buyer, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.21% [1],[3],[6],[24] 0.22% [2],[7],[11],[22]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11],[22] $ 10,804  
Ending balance $ 10,804 [1],[3],[6],[24] $ 10,804 [2],[7],[11],[22]
Investment, Identifier [Axis]: Onex Baltimore Buyer, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.18% [1],[3],[4],[6],[24] 0.18% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 9,091  
Ending balance 9,150 [1],[3],[4],[6],[24] $ 9,091 [2],[7],[8],[11]
Investment, Identifier [Axis]: Onex Baltimore Buyer, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 4,906  
Fair Value $ 0  
Investment, Identifier [Axis]: Onex Baltimore Buyer, Inc., Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments   177
Fair Value   0
Investment, Identifier [Axis]: Onex Baltimore Buyer, Inc., Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments   4,729
Fair Value   $ 0
Investment, Identifier [Axis]: Oranje Holdco Inc    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.04% [1],[4],[5],[6],[12] 0.04% [2],[8],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[9],[11],[13] $ 2,000  
Ending balance 2,000 [1],[4],[5],[6],[12] $ 2,000 [2],[8],[9],[11],[13]
Investment, Identifier [Axis]: Oranje Holdco Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 250 250
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Other Cash and Cash Equivalents    
Schedule of Investments [Line Items]    
Percentage of Net Assets 2.86% [1] 2.72% [2]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2] $ 134,896  
Ending balance $ 147,656 [1] $ 134,896 [2]
Investment, Identifier [Axis]: PDI TA Holdings, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[6],[20] 0.64%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[6],[20] $ 32,851  
Investment, Identifier [Axis]: PDI TA Holdings, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 12,700  
Fair Value (127)  
Investment, Identifier [Axis]: PDI TA Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,800  
Fair Value $ (53)  
Investment, Identifier [Axis]: PGIS Intermediate Holdings, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.09% [1],[3],[4],[5],[6] 0.09% [2],[7],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[11] $ 4,522  
Ending balance $ 4,570 [1],[3],[4],[5],[6] $ 4,522 [2],[7],[9],[11]
Investment, Identifier [Axis]: PGIS Intermediate Holdings, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.01% [1],[3],[4],[5],[6] 0.01% [2],[7],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] $ 249  
Ending balance 646 [1],[3],[4],[5],[6] $ 249 [2],[7],[8],[9],[11]
Investment, Identifier [Axis]: PGIS Intermediate Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 3,620 4,007
Fair Value 0 0
Investment, Identifier [Axis]: PGIS Intermediate Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 469 469
Fair Value $ (9) $ (9)
Investment, Identifier [Axis]: PPT Holdings III, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[6],[14] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[6],[14] $ 1,570  
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.04% [1],[3],[4],[5],[6] 0.04% [2],[7],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[11] $ 1,971  
Ending balance 1,976 [1],[3],[4],[5],[6] $ 1,971 [2],[7],[9],[11]
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 78 78
Fair Value 0 0
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 159 159
Fair Value $ (1) $ (1)
Investment, Identifier [Axis]: Park Place Technologies, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[6] 2.24%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[6] $ 115,287  
Investment, Identifier [Axis]: Park Place Technologies, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 18,198  
Fair Value (91)  
Investment, Identifier [Axis]: Park Place Technologies, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 13,648  
Fair Value 0  
Investment, Identifier [Axis]: Pavion Corp.    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[8],[10],[11]   1.62%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[10],[11] $ 80,138  
Ending balance [2],[7],[8],[10],[11]   $ 80,138
Investment, Identifier [Axis]: Pavion Corp. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[6],[20] 1.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[6],[20] $ 77,373  
Investment, Identifier [Axis]: Pavion Corp. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[6],[20] 0.11%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[6],[20] $ 5,530  
Investment, Identifier [Axis]: Pavion Corp., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 12,552 18,279
Fair Value $ 0 (183)
Investment, Identifier [Axis]: Pavion Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   9,565
Fair Value   $ 0
Investment, Identifier [Axis]: Petrus Buyer Inc    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.04% [1],[3],[4],[5],[6] 0.04% [2],[7],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] $ 1,882  
Ending balance 1,877 [1],[3],[4],[5],[6] $ 1,882 [2],[7],[8],[9],[11]
Investment, Identifier [Axis]: Petrus Buyer Inc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 595 595
Fair Value (9) (9)
Investment, Identifier [Axis]: Petrus Buyer Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 272 272
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Phoenix 1 Buyer Corp.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.50% [1],[4],[6],[14] 0.52% [2],[8],[11],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[11],[15] $ 25,573  
Ending balance 25,882 [1],[4],[6],[14] $ 25,573 [2],[8],[11],[15]
Investment, Identifier [Axis]: Phoenix 1 Buyer Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 5,009 5,009
Fair Value $ 0 $ (50)
Investment, Identifier [Axis]: Point Broadband Acquisition, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 2.41% [1],[6],[12] 1.73% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 85,486  
Ending balance 124,139 [1],[6],[12] $ 85,486 [2],[11],[13]
Investment, Identifier [Axis]: Point Broadband Acquisition, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[11],[13]   0.79%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 38,969  
Ending balance [2],[11],[13]   $ 38,969
Investment, Identifier [Axis]: Point Broadband Holdings, LLC - Class A Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.14% [1],[6] 0.14% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 7,049  
Ending balance $ 7,049 [1],[6] $ 7,049 [2],[11]
Investment, Identifier [Axis]: Point Broadband Holdings, LLC - Class Additional A Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.03% [1],[6] 0.03% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 1,515  
Ending balance $ 1,515 [1],[6] $ 1,515 [2],[11]
Investment, Identifier [Axis]: Point Broadband Holdings, LLC - Class Additional B Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.01% [1],[6] 0.01% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 536  
Ending balance $ 536 [1],[6] $ 536 [2],[11]
Investment, Identifier [Axis]: Point Broadband Holdings, LLC - Class B Units    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.05% [1],[6] 0.05% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 2,492  
Ending balance $ 2,492 [1],[6] $ 2,492 [2],[11]
Investment, Identifier [Axis]: Porcelain Acquisition Corp.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.02% [1],[6],[12] 1.06% [2],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[13] $ 52,267  
Ending balance $ 52,557 [1],[6],[12] $ 52,267 [2],[13]
Investment, Identifier [Axis]: Profile Products, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.14% [1],[3],[6] 0.02% [2]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2] $ 1,189  
Ending balance $ 7,045 [1],[3],[6] $ 1,189 [2]
Investment, Identifier [Axis]: Profile Products, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.00% [1],[3],[4],[6] 0.12% [2]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2] $ 5,857  
Ending balance 157 [1],[3],[4],[6] $ 5,857 [2]
Investment, Identifier [Axis]: Profile Products, LLC, Revolver 1    
Schedule of Investments [Line Items]    
Unfunded commitments 353 520
Fair Value 0 (17)
Investment, Identifier [Axis]: Profile Products, LLC, Revolver 2    
Schedule of Investments [Line Items]    
Unfunded commitments 347 353
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Progress Residential PM Holdings, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.32% [1],[3],[4],[6] 1.37% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 67,900  
Ending balance $ 67,900 [1],[3],[4],[6] $ 67,900 [2],[7],[8],[11]
Investment, Identifier [Axis]: Progress Residential PM Holdings, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.02% [1],[3],[4],[6] 0.02% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 833  
Ending balance 833 [1],[3],[4],[6] $ 833 [2],[7],[8],[11]
Investment, Identifier [Axis]: Progress Residential PM Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   16,623
Fair Value   0
Investment, Identifier [Axis]: Progress Residential PM Holdings, LLC, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 16,623 333
Fair Value 0 $ 0
Investment, Identifier [Axis]: Progress Residential PM Holdings, LLC, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 333  
Fair Value $ 0  
Investment, Identifier [Axis]: Project Ruby Ultimate Parent Corp.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.16% [1],[3] 0.17% [2],[7]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7] $ 8,201  
Ending balance 8,355 [1],[3] $ 8,201 [2],[7]
Investment, Identifier [Axis]: Pye-Barker Fire & Safety LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 18,278 18,278
Fair Value $ (183) $ (183)
Investment, Identifier [Axis]: Quality Distribution LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.01% [1],[4],[6],[12] 0.01% [2],[8],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[11],[13] $ 681  
Ending balance $ 688 [1],[4],[6],[12] $ 681 [2],[8],[11],[13]
Investment, Identifier [Axis]: Quality Distribution LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.02% [1],[4],[6],[12] 0.37% [2],[8],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[9],[11],[13] $ 18,220  
Ending balance $ 859 [1],[4],[6],[12] $ 18,220 [2],[8],[9],[11],[13]
Investment, Identifier [Axis]: Quality Distribution LLC 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[5],[6],[12] 0.36%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[5],[6],[12] $ 18,308  
Investment, Identifier [Axis]: Quality Distribution LLC, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 12 25
Fair Value 0 0
Investment, Identifier [Axis]: Quality Distribution LLC, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 1,931 1,931
Fair Value (10) (10)
Investment, Identifier [Axis]: Quality Distribution LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,235  
Fair Value $ 0  
Investment, Identifier [Axis]: Quality Distribution LLC, Revolver 1    
Schedule of Investments [Line Items]    
Unfunded commitments   94
Fair Value   (3)
Investment, Identifier [Axis]: Quality Distribution LLC, Revolver 2    
Schedule of Investments [Line Items]    
Unfunded commitments   3,000
Fair Value   $ (135)
Investment, Identifier [Axis]: Qualus Power Services Corp. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.62% [1],[6],[12] 0.65% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 31,962  
Ending balance $ 32,205 [1],[6],[12] $ 31,962 [2],[11],[13]
Investment, Identifier [Axis]: Qualus Power Services Corp. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.62% [1],[4],[6],[12] 0.64% [2],[8],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[11],[13] $ 31,515  
Ending balance 31,756 [1],[4],[6],[12] $ 31,515 [2],[8],[11],[13]
Investment, Identifier [Axis]: Qualus Power Services Corp., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 3,737 3,737
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: RPBLS Midco, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[5],[6],[16] 0.18%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[5],[6],[16] $ 9,324  
Investment, Identifier [Axis]: RPBLS Midco, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[9],[11]   0.15%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[11] 7,388  
Ending balance [2],[7],[9],[11]   $ 7,388
Investment, Identifier [Axis]: RPBLS Midco, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[9],[11],[17]   0.04%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[11],[17] $ 1,961  
Ending balance [2],[9],[11],[17]   $ 1,961
Investment, Identifier [Axis]: RWL Holdings, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.55% [1],[5],[6],[12] 0.58% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 28,656  
Ending balance $ 28,583 [1],[5],[6],[12] $ 28,656 [2],[7],[11]
Investment, Identifier [Axis]: Rally Buyer, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[5],[6] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[5],[6] $ 866  
Investment, Identifier [Axis]: Rally Buyer, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[8],[9],[11]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] 824  
Ending balance [2],[7],[8],[9],[11]   $ 824
Investment, Identifier [Axis]: Rally Buyer, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[8],[9],[11]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] 42  
Ending balance [2],[7],[8],[9],[11]   $ 42
Investment, Identifier [Axis]: Rally Buyer, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 33 75
Fair Value 0 0
Investment, Identifier [Axis]: Rally Buyer, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 110 66
Fair Value $ (2) $ 0
Investment, Identifier [Axis]: Razor Holdco, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.72% [1],[3],[6] 0.74% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 36,693  
Ending balance $ 36,876 [1],[3],[6] $ 36,693 [2],[7],[11]
Investment, Identifier [Axis]: Red Fox CD Acquisition Corp    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[6],[12] 1.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[6],[12] $ 77,089  
Investment, Identifier [Axis]: Red River Technology, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.55% [1],[6],[12] 1.61% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 79,967  
Ending balance 79,763 [1],[6],[12] $ 79,967 [2],[11],[13]
Investment, Identifier [Axis]: Redwood Services Group, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[8],[11]   0.09%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 4,430  
Ending balance [2],[7],[8],[11]   $ 4,430
Investment, Identifier [Axis]: Redwood Services Group, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[6],[12] 0.09%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[6],[12] $ 4,664  
Investment, Identifier [Axis]: Redwood Services Group, LLC 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[4],[5],[6],[12] 0.09%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[4],[5],[6],[12] $ 4,730  
Investment, Identifier [Axis]: Redwood Services Group, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 73,181  
Fair Value $ 0  
Investment, Identifier [Axis]: Redwood Services Group, LLC, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments   53
Fair Value   0
Investment, Identifier [Axis]: Redwood Services Group, LLC, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments   139
Fair Value   $ 0
Investment, Identifier [Axis]: Relativity ODA, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.37% [1],[4],[6],[12] 0.43% [2],[8],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[11],[13] $ 21,087  
Ending balance 19,170 [1],[4],[6],[12] $ 21,087 [2],[8],[11],[13]
Investment, Identifier [Axis]: Relativity ODA, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,966 3,292
Fair Value $ (22) $ (49)
Investment, Identifier [Axis]: RoadOne Inc    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.02% [1],[3],[6] 0.02% [2],[8],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[9],[11],[13] $ 1,075  
Ending balance 1,073 [1],[3],[6] $ 1,075 [2],[8],[9],[11],[13]
Investment, Identifier [Axis]: RoadOne Inc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 163 163
Fair Value 0 0
Investment, Identifier [Axis]: RoadOne Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 275 275
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Roadsafe Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.55% [1],[6],[12] 0.57% [2],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[13] $ 28,339  
Ending balance $ 28,267 [1],[6],[12] $ 28,339 [2],[13]
Investment, Identifier [Axis]: Roadsafe Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.38% [1],[6],[12] 0.40% [2],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[13] $ 19,820  
Ending balance $ 19,769 [1],[6],[12] $ 19,820 [2],[13]
Investment, Identifier [Axis]: Roadsafe Holdings, Inc. 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.08% [1],[6],[12] 0.08% [2],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[13] $ 4,040  
Ending balance $ 4,030 [1],[6],[12] $ 4,040 [2],[13]
Investment, Identifier [Axis]: S&P Global Engineering Solutions    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.03% [1],[4],[5],[6],[12] 0.03% [2],[8],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[9],[11],[13] $ 1,596  
Ending balance 1,592 [1],[4],[5],[6],[12] $ 1,596 [2],[8],[9],[11],[13]
Investment, Identifier [Axis]: S&P Global Engineering Solutions, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 249 249
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: SEKO Global Logistics Network, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.11% [1],[5],[6],[12] 0.11% [2],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[11],[13] $ 5,365  
Ending balance $ 5,922 [1],[5],[6],[12] $ 5,365 [2],[9],[11],[13]
Investment, Identifier [Axis]: SEKO Global Logistics Network, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.01% [1],[4],[5],[6],[12] 0.00% [2],[8],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[9],[11],[13] $ 167  
Ending balance 301 [1],[4],[5],[6],[12] $ 167 [2],[8],[9],[11],[13]
Investment, Identifier [Axis]: SEKO Global Logistics Network, LLC 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[9],[11],[13]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[11],[13] $ 775  
Ending balance [2],[9],[11],[13]   $ 775
Investment, Identifier [Axis]: SEKO Global Logistics Network, LLC 4    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.04% [1],[5],[6],[12] 0.04% [2],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[11],[13] $ 1,985  
Ending balance 1,866 [1],[5],[6],[12] $ 1,985 [2],[9],[11],[13]
Investment, Identifier [Axis]: SEKO Global Logistics Network, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 280 432
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: SG Acquisition, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 2.02% [1],[6],[16] 2.09% [2],[11],[17]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[17] $ 103,662  
Ending balance 103,924 [1],[6],[16] $ 103,662 [2],[11],[17]
Investment, Identifier [Axis]: SG Acquisition, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 8,218  
Fair Value 0  
Investment, Identifier [Axis]: SG Acquisition, Inc., Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 31,429  
Fair Value $ 0  
Investment, Identifier [Axis]: STV Group, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[6] 0.46%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[6] $ 23,761  
Investment, Identifier [Axis]: STV Group, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 6,976  
Fair Value (70)  
Investment, Identifier [Axis]: STV Group, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 4,883  
Fair Value $ (98)  
Investment, Identifier [Axis]: Safety Borrower Holdings LP 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.10% [1],[5],[6],[12] 0.10% [2],[9],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[13] $ 5,032  
Ending balance $ 5,311 [1],[5],[6],[12] $ 5,032 [2],[9],[13]
Investment, Identifier [Axis]: Safety Borrower Holdings LP 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.00% [1],[4],[5],[6],[12] 0.01% [2],[8],[9],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[9],[13] $ 276  
Ending balance 52 [1],[4],[5],[6],[12] $ 276 [2],[8],[9],[13]
Investment, Identifier [Axis]: Safety Borrower Holdings LP, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 317 93
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Sam Holding Co, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.71% [1],[6],[12] 0.75% [2],[8],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[13] $ 37,206  
Ending balance $ 36,772 [1],[6],[12] $ 37,206 [2],[8],[13]
Investment, Identifier [Axis]: Sam Holding Co, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.53% [1],[6],[12] 0.23% [2],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[13] $ 11,378  
Ending balance $ 27,163 [1],[6],[12] $ 11,378 [2],[13]
Investment, Identifier [Axis]: Sam Holding Co, Inc. 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.09% [1],[4],[6],[12] 0.32% [2],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[13] $ 15,761  
Ending balance 4,848 [1],[4],[6],[12] $ 15,761 [2],[13]
Investment, Identifier [Axis]: Sam Holding Co, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 5,050 9,300
Fair Value 0 0
Investment, Identifier [Axis]: Sam Holding Co, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 6,000 6,000
Fair Value (45) $ (75)
Investment, Identifier [Axis]: Scorpio Bidco, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 4,749  
Fair Value 0  
Investment, Identifier [Axis]: Scorpio Bidco, Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 24,133  
Fair Value $ 0  
Investment, Identifier [Axis]: SelectQuote, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.28% [1],[3],[5],[6] 1.34% [2],[7],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[11] $ 66,538  
Ending balance $ 65,755 [1],[3],[5],[6] $ 66,538 [2],[7],[9],[11]
Investment, Identifier [Axis]: Shelf Bidco Ltd    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.10% [1],[3],[5],[6],[20],[24] 0.10% [2],[7],[9],[10],[11],[22]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[10],[11],[22] $ 5,053  
Ending balance $ 5,066 [1],[3],[5],[6],[20],[24] $ 5,053 [2],[7],[9],[10],[11],[22]
Investment, Identifier [Axis]: Shelf Holdco Ltd Common Equity    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.00% [1],[6] 0.00% [2],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[10],[11] $ 88  
Ending balance $ 125 [1],[6] $ 88 [2],[10],[11]
Investment, Identifier [Axis]: Sherlock Buyer Corp.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.16% [1],[3],[4],[6] 0.17% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 8,267  
Ending balance 8,443 [1],[3],[4],[6] $ 8,267 [2],[7],[8],[11]
Investment, Identifier [Axis]: Sherlock Buyer Corp., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   2,794
Fair Value   (28)
Investment, Identifier [Axis]: Sherlock Buyer Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,111 1,111
Fair Value (22) $ (22)
Investment, Identifier [Axis]: Shoals Holdings, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[11],[13]   1.24%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] 61,350  
Ending balance [2],[11],[13]   $ 61,350
Investment, Identifier [Axis]: Smile Doctors, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[7],[8],[11]   0.21%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 10,571  
Ending balance [2],[7],[8],[11]   $ 10,571
Investment, Identifier [Axis]: Smile Doctors, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[6] 0.21%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[6] $ 10,582  
Investment, Identifier [Axis]: Smile Doctors, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[6] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[6] $ 504  
Investment, Identifier [Axis]: Smile Doctors, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 2,062 2,607
Fair Value 0 (39)
Investment, Identifier [Axis]: Smile Doctors, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,233 1,233
Fair Value $ (31) $ (31)
Investment, Identifier [Axis]: Snoopy Bidco, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 6.09% [1],[3],[4],[6] 6.11% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 302,719  
Ending balance 314,029 [1],[3],[4],[6] $ 302,719 [2],[7],[8],[11]
Investment, Identifier [Axis]: Snoopy Bidco, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 15,786 15,786
Fair Value $ (237) $ (237)
Investment, Identifier [Axis]: SpecialtyCare, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.23% [1],[5],[6],[12] 0.23% [2],[8],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[9],[11],[13] $ 11,592  
Ending balance $ 11,651 [1],[5],[6],[12] $ 11,592 [2],[8],[9],[11],[13]
Investment, Identifier [Axis]: SpecialtyCare, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.00% [1],[4],[5],[6],[14] 0.00% [2],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[9],[11] $ 146  
Ending balance $ 198 [1],[4],[5],[6],[14] $ 146 [2],[8],[9],[11]
Investment, Identifier [Axis]: SpecialtyCare, Inc. 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[4],[5],[6],[12] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[4],[5],[6],[12] $ 72  
Investment, Identifier [Axis]: SpecialtyCare, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 1,155 1,155
Fair Value 0 0
Investment, Identifier [Axis]: SpecialtyCare, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 823 865
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Spitfire Parent, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.52% [1],[6],[12] 1.59% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 78,620  
Ending balance $ 78,419 [1],[6],[12] $ 78,620 [2],[11],[13]
Investment, Identifier [Axis]: Spitfire Parent, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.23% [1],[6],[12] 0.24% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 12,128  
Ending balance $ 11,842 [1],[6],[12] $ 12,128 [2],[11],[13]
Investment, Identifier [Axis]: Stamps.com, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 5.38% [1],[3],[6] 5.62% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 278,069  
Ending balance 277,361 [1],[3],[6] $ 278,069 [2],[7],[11]
Investment, Identifier [Axis]: State Street Institutional U.S. Government Money Market Fund    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2]   0.40%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2] $ 19,961  
Ending balance [2]   $ 19,961
Investment, Identifier [Axis]: Stepping Stones Healthcare Services, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.05% [1],[3],[4],[6] 0.05% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 2,626  
Ending balance 2,673 [1],[3],[4],[6] $ 2,626 [2],[7],[8],[11]
Investment, Identifier [Axis]: Stepping Stones Healthcare Services, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   155
Fair Value   0
Investment, Identifier [Axis]: Stepping Stones Healthcare Services, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 371 371
Fair Value $ (6) $ (13)
Investment, Identifier [Axis]: TCFI AEVEX, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 2.13% [1],[6],[12] 2.23% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 110,230  
Ending balance $ 109,945 [1],[6],[12] $ 110,230 [2],[11],[13]
Investment, Identifier [Axis]: THL Fund IX Investors (Plymouth II), LP    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.00% [1],[6] 0.01% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 249  
Ending balance $ 249 [1],[6] $ 249 [2],[11]
Investment, Identifier [Axis]: TPG IX Newark CI, L.P. - LP Interests    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.04% [1],[6] 0.04% [2],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[10],[11] $ 1,965  
Ending balance $ 1,966 [1],[6] $ 1,965 [2],[10],[11]
Investment, Identifier [Axis]: TRP Infrastructure Services, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.68% [1],[6],[12] 0.70% [2],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[13] $ 34,608  
Ending balance $ 34,914 [1],[6],[12] $ 34,608 [2],[13]
Investment, Identifier [Axis]: Tailwind Colony Holding Corporation    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[6],[12] 0.92%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[6],[12] $ 47,338  
Investment, Identifier [Axis]: Tailwind Colony Holding Corporation 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[11],[13]   0.11%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] 5,581  
Ending balance [2],[11],[13]   $ 5,581
Investment, Identifier [Axis]: Tailwind Colony Holding Corporation 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[11],[13]   0.84%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 41,465  
Ending balance [2],[11],[13]   $ 41,465
Investment, Identifier [Axis]: Tennessee Bidco Limited 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.04% [1],[5],[6],[14],[20] 0.04% [2],[9],[10],[11],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[10],[11],[15] $ 2,010  
Ending balance $ 1,990 [1],[5],[6],[14],[20] $ 2,010 [2],[9],[10],[11],[15]
Investment, Identifier [Axis]: Tennessee Bidco Limited 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.07% [1],[5],[6],[14],[20] 1.10% [2],[9],[10],[11],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[10],[11],[15] $ 54,303  
Ending balance $ 55,004 [1],[5],[6],[14],[20] $ 54,303 [2],[9],[10],[11],[15]
Investment, Identifier [Axis]: Tennessee Bidco Limited 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.31% [1],[5],[6],[14],[20] 0.33% [2],[9],[10],[11],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[10],[11],[15] $ 16,176  
Ending balance $ 16,231 [1],[5],[6],[14],[20] $ 16,176 [2],[9],[10],[11],[15]
Investment, Identifier [Axis]: Tennessee Bidco Limited 4    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.08% [1],[5],[6],[14],[20] 1.12% [2],[9],[10],[11],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[10],[11],[15] $ 55,366  
Ending balance 55,455 [1],[5],[6],[14],[20] $ 55,366 [2],[9],[10],[11],[15]
Investment, Identifier [Axis]: Tetra Technologies, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[10],[11],[13]   0.36%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[10],[11],[13] $ 17,790  
Ending balance [2],[10],[11],[13]   $ 17,790
Investment, Identifier [Axis]: The Fertility Partners, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.10% [1],[3],[5],[6],[20] 0.10% [2],[7],[9],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[10],[11] $ 4,913  
Ending balance $ 4,900 [1],[3],[5],[6],[20] $ 4,913 [2],[7],[9],[10],[11]
Investment, Identifier [Axis]: The Fertility Partners, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.07% [1],[3],[5],[6],[20] 0.07% [2],[7],[9],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[10],[11] $ 3,512  
Ending balance $ 3,436 [1],[3],[5],[6],[20] $ 3,512 [2],[7],[9],[10],[11]
Investment, Identifier [Axis]: The Fertility Partners, Inc. 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.00% [1],[3],[4],[5],[6],[20] 0.00% [2],[7],[8],[9],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[10],[11] $ 121  
Ending balance 115 [1],[3],[4],[5],[6],[20] $ 121 [2],[7],[8],[9],[10],[11]
Investment, Identifier [Axis]: The Fertility Partners, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 127 127
Fair Value 0 $ 0
Investment, Identifier [Axis]: The GI Alliance Management, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets [2],[9],[11],[13]   0.10%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[11],[13] $ 4,942  
Ending balance [2],[9],[11],[13]   $ 4,942
Investment, Identifier [Axis]: The GI Alliance Management, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[4],[5],[6] 0.07%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[4],[5],[6] $ 3,595  
Investment, Identifier [Axis]: The GI Alliance Management, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[6] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[6] $ 450  
Investment, Identifier [Axis]: The GI Alliance Management, LLC 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[6] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[6] $ 874  
Investment, Identifier [Axis]: The GI Alliance Management, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 46,071  
Fair Value $ (461)  
Investment, Identifier [Axis]: Thevelia US, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.03% [1],[5],[16],[20] 0.03% [2],[9],[10],[17]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[10],[17] $ 1,299  
Ending balance $ 1,297 [1],[5],[16],[20] $ 1,299 [2],[9],[10],[17]
Investment, Identifier [Axis]: Thevelia US, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.10% [1],[5],[6],[16],[20] 0.10% [2],[9],[10],[11],[17]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[10],[11],[17] $ 4,908  
Ending balance $ 4,908 [1],[5],[6],[16],[20] $ 4,908 [2],[9],[10],[11],[17]
Investment, Identifier [Axis]: Titan Investment Company, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.77% [1],[5],[6],[14] 0.79% [2],[9],[11],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[11],[15] $ 39,206  
Ending balance $ 39,621 [1],[5],[6],[14] $ 39,206 [2],[9],[11],[15]
Investment, Identifier [Axis]: Trader Corp.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.13% [1],[3],[4],[5],[6],[20] 0.15% [2],[7],[8],[9],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[10],[11] $ 7,300  
Ending balance 6,919 [1],[3],[4],[5],[6],[20] $ 7,300 [2],[7],[8],[9],[10],[11]
Investment, Identifier [Axis]: Trader Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,015 830
Fair Value $ (389) $ (190)
Investment, Identifier [Axis]: Tricor Horizon, LP    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.01% [1],[6],[20] 0.01% [2],[10],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[10],[11] $ 386  
Ending balance $ 386 [1],[6],[20] $ 386 [2],[10],[11]
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.21% [1],[3],[4],[6] 1.13% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 55,812  
Ending balance $ 62,541 [1],[3],[4],[6] $ 55,812 [2],[7],[8],[11]
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.45% [1],[3],[4],[6] 0.45% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 22,390  
Ending balance 23,259 [1],[3],[4],[6] $ 22,390 [2],[7],[8],[11]
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp., Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 325 402
Fair Value 0 0
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp., Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 9,073 11,274
Fair Value 0 (113)
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 7,269 6,881
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Trinity Partners Holdings, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.09% [1],[3],[4],[6] 0.10% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 4,742  
Ending balance 4,880 [1],[3],[4],[6] $ 4,742 [2],[7],[8],[11]
Investment, Identifier [Axis]: Trinity Partners Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 1,277 1,433
Fair Value $ 0 $ (14)
Investment, Identifier [Axis]: Triple Lift, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.12% [1],[3],[6] 1.20% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 59,500  
Ending balance $ 57,810 [1],[3],[6] $ 59,500 [2],[7],[11]
Investment, Identifier [Axis]: Triple Lift, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.05% [1],[3],[4],[6] 0.05% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 2,681  
Ending balance 2,489 [1],[3],[4],[6] $ 2,681 [2],[7],[8],[11]
Investment, Identifier [Axis]: Triple Lift, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 4,747 4,747
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Turing Holdco, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.17% [1],[5],[6],[14],[20] 0.17% [2],[9],[10],[11],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[10],[11],[15] $ 8,546  
Ending balance $ 8,601 [1],[5],[6],[14],[20] $ 8,546 [2],[9],[10],[11],[15]
Investment, Identifier [Axis]: Turing Holdco, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.13% [1],[4],[5],[6],[14],[20] 0.08% [2],[8],[9],[10],[11],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[9],[10],[11],[15] $ 3,992  
Ending balance $ 6,597 [1],[4],[5],[6],[14],[20] $ 3,992 [2],[8],[9],[10],[11],[15]
Investment, Identifier [Axis]: Turing Holdco, Inc. 3    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.23% [1],[6],[14],[20] 0.25% [2],[10],[11],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[10],[11],[15] $ 12,165  
Ending balance $ 11,888 [1],[6],[14],[20] $ 12,165 [2],[10],[11],[15]
Investment, Identifier [Axis]: Turing Holdco, Inc. 4    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.09% [1],[6],[14],[20] 0.09% [2],[10],[11],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[10],[11],[15] $ 4,509  
Ending balance 4,579 [1],[6],[14],[20] $ 4,509 [2],[10],[11],[15]
Investment, Identifier [Axis]: Turing Holdco, Inc., Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 29,089 31,468
Fair Value 0 0
Investment, Identifier [Axis]: Turing Holdco, Inc., Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 20,901 20,901
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: UMP Holdings, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.02% [1],[3],[5],[6] 0.02% [2],[7],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[11] $ 1,068  
Ending balance $ 1,093 [1],[3],[5],[6] $ 1,068 [2],[7],[9],[11]
Investment, Identifier [Axis]: UMP Holdings, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.03% [1],[3],[4],[5],[6] 0.03% [2],[7],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] $ 1,463  
Ending balance 1,494 [1],[3],[4],[5],[6] $ 1,463 [2],[7],[8],[9],[11]
Investment, Identifier [Axis]: UMP Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 440 440
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.87% [1],[3],[6] 0.63% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 31,065  
Ending balance $ 44,835 [1],[3],[6] $ 31,065 [2],[7],[11]
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.13% [1],[3],[4],[6] 0.32% [2],[8],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[11],[13] $ 15,734  
Ending balance 6,771 [1],[3],[4],[6] $ 15,734 [2],[8],[11],[13]
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 42,667 46,867
Fair Value 0 0
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,233 3,233
Fair Value $ (32) $ (73)
Investment, Identifier [Axis]: Unified Door & Hardware Group, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.81% [1],[6],[12] 1.87% [2],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[13] $ 92,486  
Ending balance $ 93,186 [1],[6],[12] $ 92,486 [2],[11],[13]
Investment, Identifier [Axis]: Unified Physician Management, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.04% [1],[4],[5],[6] 0.04% [2],[8],[9],[11],[17]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[9],[11],[17] $ 2,102  
Ending balance 2,012 [1],[4],[5],[6] $ 2,102 [2],[8],[9],[11],[17]
Investment, Identifier [Axis]: Unified Physician Management, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 22,616  
Fair Value 0  
Investment, Identifier [Axis]: Unified Physician Management, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 241 241
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Veregy Consolidated, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.39% [1],[6],[12] 0.38% [2],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[13] $ 18,680  
Ending balance $ 20,182 [1],[6],[12] $ 18,680 [2],[13]
Investment, Identifier [Axis]: Victory Buyer, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.18% [1],[6],[16] 0.18% [2],[11],[17]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11],[17] $ 8,970  
Ending balance $ 9,066 [1],[6],[16] $ 8,970 [2],[11],[17]
Investment, Identifier [Axis]: WHCG Purchaser III, Inc. 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.51% [1],[3],[5],[6] 0.53% [2],[7],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[9],[11] $ 26,419  
Ending balance $ 26,419 [1],[3],[5],[6] $ 26,419 [2],[7],[9],[11]
Investment, Identifier [Axis]: WHCG Purchaser III, Inc. 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.08% [1],[3],[4],[5],[6] 0.08% [2],[7],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] $ 4,084  
Ending balance 4,084 [1],[3],[4],[5],[6] $ 4,084 [2],[7],[8],[9],[11]
Investment, Identifier [Axis]: WHCG Purchaser III, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 17 17
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: WPEngine, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 1.28% [1],[3],[4],[6] 1.32% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 65,133  
Ending balance 65,800 [1],[3],[4],[6] $ 65,133 [2],[7],[8],[11]
Investment, Identifier [Axis]: WPEngine, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 6,667 6,667
Fair Value $ (200) $ (200)
Investment, Identifier [Axis]: West Monroe Partners, LLC 1    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.28% [1],[3],[6] 0.29% [2],[7],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[11] $ 14,377  
Ending balance $ 14,341 [1],[3],[6] $ 14,377 [2],[7],[11]
Investment, Identifier [Axis]: West Monroe Partners, LLC 2    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.01% [1],[3],[4],[6] 0.01% [2],[7],[8],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[11] $ 281  
Ending balance 281 [1],[3],[4],[6] $ 281 [2],[7],[8],[11]
Investment, Identifier [Axis]: West Monroe Partners, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,155 1,155
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Windows Acquisition Holdings, Inc.    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.96% [1],[5],[6],[12] 1.01% [2],[9],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[9],[11],[13] $ 49,997  
Ending balance $ 49,747 [1],[5],[6],[12] $ 49,997 [2],[9],[11],[13]
Investment, Identifier [Axis]: World Insurance Associates, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.72% [1],[4],[6],[12] 0.75% [2],[8],[11],[13]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[8],[11],[13] $ 36,914  
Ending balance 37,231 [1],[4],[6],[12] $ 36,914 [2],[8],[11],[13]
Investment, Identifier [Axis]: World Insurance Associates, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 47,025 47,025
Fair Value (470) (470)
Investment, Identifier [Axis]: World Insurance Associates, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,939 2,939
Fair Value $ (29) $ (59)
Investment, Identifier [Axis]: Zendesk Inc    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.03% [1],[3],[4],[5],[6] 0.03% [2],[7],[8],[9],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[7],[8],[9],[11] $ 1,614  
Ending balance 1,614 [1],[3],[4],[5],[6] $ 1,614 [2],[7],[8],[9],[11]
Investment, Identifier [Axis]: Zendesk Inc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 361 361
Fair Value (5) (5)
Investment, Identifier [Axis]: Zendesk Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 169 169
Fair Value $ (3) $ (3)
Investment, Identifier [Axis]: Zeus, LLC    
Schedule of Investments [Line Items]    
Percentage of Net Assets [1],[3],[4],[6] 0.47%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[3],[4],[6] $ 24,097  
Investment, Identifier [Axis]: Zeus, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 4,568  
Fair Value (34)  
Investment, Identifier [Axis]: Zeus, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,426  
Fair Value $ (51)  
Investment, Identifier [Axis]: Zoro Common Equity    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.00% [1],[6],[20] 0.00% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 21  
Ending balance $ 21 [1],[6],[20] $ 21 [2],[11]
Investment, Identifier [Axis]: Zoro Series A Preferred Shares    
Schedule of Investments [Line Items]    
Percentage of Net Assets 0.01% [1],[6] 0.01% [2],[11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [2],[11] $ 418  
Ending balance $ 438 [1],[6] $ 418 [2],[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 March 31, 2024, the Company had investments denominated in Canadian Dollars (CAD), Euros (EUR), British Pounds (GBP), Danish Krone (DKK), Swedish Krona (SEK), Norwegian Krone (NOK), and Australian Dollars (AUD). 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] 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.
[3] The interest rate floor on these investments as of March 31, 2024 was 0.75%.
[4] 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:
[5] 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.
[6] 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.
[7] The interest rate floor on these investments as of December 31, 2023 was 0.75%.
[8] 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:
[9] 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.
[10] 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.
[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), pursuant to the Company’s valuation policy.
[12] The interest rate floor on these investments as of March 31, 2024 was 1.00%
[13] The interest rate floor on these investments as of December 31, 2023 was 1.00%.
[14] There are no interest rate floors on these investments.
[15] There are no interest rate floors on these investments.
[16] The interest rate floor on these investments as of March 31, 2024 was 0.50%
[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 March 31, 2024 was 1.50%.
[19] The interest rate floor on these investments as of December 31, 2023 was 1.50%.
[20] 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 March 31, 2024, non-qualifying assets represented 11.2% of total assets as calculated in accordance with regulatory requirements.
[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 March 31, 2024, 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 March 31, 2024, the Company’s non-controlled/affiliated investments were as follows:
Fair Value as of December 31, 2023
Gross AdditionsGross Reductions
Net Change in Unrealized Gains (Losses)
Net Realized Gain (Loss)
Fair Value as of March 31, 2024
Dividend and Interest Income
Non-controlled/Affiliated Investments
Blackstone Donegal Holdings LP$5,790 $— $— $312 $— $6,102 $— 
Total$5,790 $ $ $312 $ $6,102 $ 
[22] 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.
[23] Loan was on non-accrual status as of March 31, 2024.
[24] 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.
[25] Loan was on non-accrual status as of December 31, 2023.