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Significant Accounting Policies - Revenues From Contracts with Customers (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 33,990,503	$ 42,256,386
Investment advisory
Disaggregation of Revenue [Line Items]
Revenue	32,042,459	39,278,886
Mutual fund administration, net
Disaggregation of Revenue [Line Items]
Revenue	1,948,044	2,977,500
Diamond Hill Funds
Disaggregation of Revenue [Line Items]
Revenue	23,331,587	30,232,428
Diamond Hill Funds | Investment advisory
Disaggregation of Revenue [Line Items]
Revenue	21,383,543	27,254,928
Diamond Hill Funds | Mutual fund administration, net
Disaggregation of Revenue [Line Items]
Revenue	1,948,044	2,977,500
Separately managed accounts
Disaggregation of Revenue [Line Items]
Revenue	6,264,361	7,192,290
Separately managed accounts | Investment advisory
Disaggregation of Revenue [Line Items]
Revenue	6,264,361	7,192,290
Separately managed accounts | Mutual fund administration, net
Disaggregation of Revenue [Line Items]
Revenue	0	0
Other pooled vehicles | Mutual fund administration, net
Disaggregation of Revenue [Line Items]
Revenue	0	0
Model delivery
Disaggregation of Revenue [Line Items]
Revenue	1,361,753	1,717,164
Model delivery | Investment advisory
Disaggregation of Revenue [Line Items]
Revenue	1,361,753	1,717,164
Model delivery | Mutual fund administration, net
Disaggregation of Revenue [Line Items]
Revenue	0	0
Collective investment trusts
Disaggregation of Revenue [Line Items]
Revenue	901,121	545,495
Collective investment trusts | Investment advisory
Disaggregation of Revenue [Line Items]
Revenue	901,121	545,495
Collective investment trusts | Mutual fund administration, net
Disaggregation of Revenue [Line Items]
Revenue	0	0
Other Pooled Vehicles
Disaggregation of Revenue [Line Items]
Revenue	2,131,681	2,569,009
Other Pooled Vehicles | Investment advisory
Disaggregation of Revenue [Line Items]
Revenue	$ 2,131,681	$ 2,569,009

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045

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