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Sale of Assets of Diamond Hill's High Yield-Focused Fund (Details) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 02, 2021 USD ($) payment | Sep. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from sale of high yield-focused advisory contracts |  |  | $ 9,000,000 | $ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Acquired Funds |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from sale of high yield-focused advisory contracts |  | $ 9,000,000 |  |
Number of additional payments | payment | 2 |  |  |
Additional consideration | $ 13,000,000 |  |  |
Additional consideration, term | 1 year |  |  |

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