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Fair Value Measurements - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Fair Value Option Quantitative Disclosures [Line Items] |  |  |  |  |
Transfers into or out of Level 3 in the fair value measurement hierarchy | $ 0 | $ 0 | $ 0 | $ 0 |
Unfunded Commitments | 5,520,000 |  | 5,520,000 |  | $ 5,597,000
EGCP III [Member] |  |  |  |  |
Fair Value Option Quantitative Disclosures [Line Items] |  |  |  |  |
Unfunded Commitments | $ 5,158,000 |  | $ 5,158,000 |  |
End of the investment period |  |  | Oct. 12, 2016 |  |
Remaining obligation date |  |  | Oct. 12, 2023 |  |

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