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Fair Value of Financial Instruments - Schedule of Reconciliation of Changes for All Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Roll Forward] |  |
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Total net realized gain (loss) | Total net realized gain (loss)
HTGC Debt And Equity Securities Realized Gain Loss |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Roll Forward] |  |
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Total net change in unrealized appreciation (depreciation) | Total net change in unrealized appreciation (depreciation)
Recurring | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Roll Forward] |  |
Beginning Balance | $ 2,882,285 | $ 2,329,044
Net Realized Gains (Losses) | (13,021) | 5,785
Net Change in Unrealized Appreciation (Depreciation) | 19,550 | (42,091)
Purchases | 1,289,369 | 1,162,985
Sales | (2,632) | (98,584)
Repayments | (990,448) | (461,193)
Gross Transfers into Level 3 | 39,979 | 207
Gross Transfers out of Level 3 | (39,979) | (13,868)
Ending Balance | 3,185,103 | 2,882,285
Recurring | Significant Unobservable Inputs (Level 3) | Preferred Stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Roll Forward] |  |
Beginning Balance | 41,488 | 69,439
Net Realized Gains (Losses) | (3,441) | 7,966
Net Change in Unrealized Appreciation (Depreciation) | (1,123) | (23,658)
Purchases | 2,851 | 5,264
Sales | 0 | (11,101)
Repayments | 0 | 0
Gross Transfers into Level 3 | 13,263 | 0
Gross Transfers out of Level 3 | 0 | (6,422)
Ending Balance | 53,038 | 41,488
Recurring | Significant Unobservable Inputs (Level 3) | Common Stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Roll Forward] |  |
Beginning Balance | 25,059 | 21,968
Net Realized Gains (Losses) | 0 | (74)
Net Change in Unrealized Appreciation (Depreciation) | 11,325 | 6,894
Purchases | 6,000 | 25
Sales | (594) | (19)
Repayments | 0 | 0
Gross Transfers into Level 3 | 0 | 207
Gross Transfers out of Level 3 | 0 | (3,942)
Ending Balance | 41,790 | 25,059
Recurring | Significant Unobservable Inputs (Level 3) | Warrants |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Roll Forward] |  |
Beginning Balance | 19,419 | 27,477
Net Realized Gains (Losses) | (4,295) | (624)
Net Change in Unrealized Appreciation (Depreciation) | 4,825 | (12,412)
Purchases | 3,894 | 7,494
Sales | (1,755) | (2,516)
Repayments | 0 | 0
Gross Transfers into Level 3 | 0 | 0
Gross Transfers out of Level 3 | 0 | 0
Ending Balance | 22,088 | 19,419
Recurring | Significant Unobservable Inputs (Level 3) | Senior Secured Debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Roll Forward] |  |
Beginning Balance | 2,741,388 | 2,156,709
Net Realized Gains (Losses) | (5,350) | (1,884)
Net Change in Unrealized Appreciation (Depreciation) | 17,277 | (9,788)
Purchases | 1,264,689 | 1,145,048
Sales | 0 | (84,000)
Repayments | (990,448) | (461,193)
Gross Transfers into Level 3 | 0 | 0
Gross Transfers out of Level 3 | (39,979) | (3,504)
Ending Balance | 2,987,577 | 2,741,388
Recurring | Significant Unobservable Inputs (Level 3) | Unsecured Debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Roll Forward] |  |
Beginning Balance | 54,056 | 52,890
Net Realized Gains (Losses) | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | 4,268 | (2,840)
Purchases | 11,398 | 4,006
Sales | 0 | 0
Repayments | 0 | 0
Gross Transfers into Level 3 | 0 | 0
Gross Transfers out of Level 3 | 0 | 0
Ending Balance | 69,722 | 54,056
Recurring | Significant Unobservable Inputs (Level 3) | Escrow and Other Investment Receivable |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Roll Forward] |  |
Beginning Balance | 875 |
Net Realized Gains (Losses) | 65 |
Net Change in Unrealized Appreciation (Depreciation) | (17,022) |
Purchases | 537 |
Sales | (283) |
Repayments | 0 |
Gross Transfers into Level 3 | 26,716 |
Gross Transfers out of Level 3 | 0 |
Ending Balance | 10,888 | 875
Recurring | Significant Unobservable Inputs (Level 3) | Escrow Receivable |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Roll Forward] |  |
Beginning Balance | $ 875 | 561
Net Realized Gains (Losses) |  | 401
Net Change in Unrealized Appreciation (Depreciation) |  | (287)
Purchases |  | 1,148
Sales |  | (948)
Repayments |  | 0
Gross Transfers into Level 3 |  | 0
Gross Transfers out of Level 3 |  | 0
Ending Balance |  | $ 875

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