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Significant Accounting Policies - Revenues From Contracts with Customers (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 36,661,333 | $ 33,350,637 | $ 72,956,263 | $ 67,341,140
Investment advisory |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 34,841,125 | 31,500,443 | 69,192,918 | 63,542,902
Mutual fund administration, net |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,820,208 | 1,850,194 | 3,763,345 | 3,798,238
Diamond Hill Funds |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 24,379,582 | 22,771,617 | 48,417,903 | 46,103,204
Diamond Hill Funds | Investment advisory |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 22,559,374 | 20,921,423 | 44,654,558 | 42,304,966
Diamond Hill Funds | Mutual fund administration, net |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,820,208 | 1,850,194 | 3,763,345 | 3,798,238
Separately managed accounts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 6,605,780 | 6,238,511 | 13,385,128 | 12,502,872
Separately managed accounts | Investment advisory |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 6,605,780 | 6,238,511 | 13,385,128 | 12,502,872
Separately managed accounts | Mutual fund administration, net |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Other pooled vehicles |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,873,703 | 2,203,023 | 5,644,416 | 4,334,704
Other pooled vehicles | Investment advisory |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,873,703 | 2,203,023 | 5,644,416 | 4,334,704
Other pooled vehicles | Mutual fund administration, net |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Model delivery |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,233,883 | 836,095 | 2,543,421 | 2,663,144
Model delivery | Investment advisory |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,233,883 | 1,301,391 | 2,543,421 | 2,663,144
Model delivery | Mutual fund administration, net |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Collective investment trusts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,568,385 | 1,301,391 | 2,965,395 | 1,737,216
Collective investment trusts | Investment advisory |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,568,385 | 836,095 | 2,965,395 | 1,737,216
Collective investment trusts | Mutual fund administration, net |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 0 | $ 0 | $ 0 | $ 0

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