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Investments - Textual (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Equity Method Investment, Deferred Compensation Plan Investments | $ 3,800,000 |  |
Company sponsored equity method investments | $ 24,105,808 | $ 13,627,360 |
Micro Cap Fund LP |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Equity method investment | 85.00% |  |
DMHF |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Equity method investment |  | 87.00% |
Company sponsored equity method investments | $ 13,100,000 | $ 13,600,000 |
Diamond Hill Core Bond Fund | Minimum |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Equity method investment |  |  | 20.00%
Diamond Hill Core Bond Fund | Maximum |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Equity method investment |  |  | 50.00%
Large Cap Concentrated Fund |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Equity method investment | 48.00% |  |
Securities held in Consolidated Funds |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Trading Investments | $ 54,740,993 | 73,855,204 |
Parent | Securities held in Consolidated Funds |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Trading Investments | 37,500,000 | 55,800,000 |
Redeemable Noncontrolling Interest | Securities held in Consolidated Funds |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Trading Investments | $ 17,200,000 | $ 18,100,000 |

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