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Related-Party Transactions - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Administration fee |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities |  | $ 2,255,000 | $ 2,005,000 | $ 1,526,000
Adviser |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities |  | 10,374,000 | 11,532,000 | 10,230,000
Adviser | Base management fee |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities |  | 8,603,000 | 8,307,000 | 6,329,000
Adviser | Incentive fee |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities |  | 1,771,000 | 3,225,000 | 3,901,000
Gladstone Securities | Financing Fees and Selling Commissions and Dealer Management Fees |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities |  | 583,000 | 13,625,000 | 5,127,000
Gladstone Securities | Selling Commissions and Dealer Management Fees |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities | $ 583,000 | 583,000 | 13,471,000 | 4,961,000
Gladstone Securities | Financing Fees |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities |  | $ 0 | $ 154,000 | $ 166,000

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