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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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