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Investments in Affiliates - Additional Information (Detail) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Investments In And Advances To Affiliates [Line Items] |  |
Treasury obligation measurement maximum maturity period | 12 months |
United States Treasury Obligations, Value | $ 694,582,126 | $ 784,350,648
United States Treasury Obligations [Member] | Affiliated Investments [Member] |  |
Investments In And Advances To Affiliates [Line Items] |  |
Treasury obligation measurement minimum maturity period | 1 month |
Treasury obligation measurement maximum maturity period | 12 months |
Minimum [Member] | United States Treasury Obligations [Member] | Affiliated Investments [Member] |  |
Investments In And Advances To Affiliates [Line Items] |  |
United States Treasury Obligations, Value | $ 300,000,000 |

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- Definition The fair value as of the balance sheet date of firm holdings in debt obligations issued by the US government including short-term Treasury bills, medium-term Treasury notes, and long-term Treasury bonds, as well as debt issued by agencies. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 940 -SubTopic 320 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479035/940-320-45-2 + Details
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