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Significant Accounting Policies - Revenue From Contracts with Customers (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 154,496,019	$ 182,193,837	$ 126,387,718
Investment advisory
Disaggregation of Revenue [Line Items]
Revenue	144,325,517	170,137,609	119,125,230
Mutual fund administration, net
Disaggregation of Revenue [Line Items]
Revenue	10,170,502	12,056,228	7,262,488
Diamond Hill Funds
Disaggregation of Revenue [Line Items]
Revenue	109,044,073	125,658,545	95,365,987
Diamond Hill Funds | Investment advisory
Disaggregation of Revenue [Line Items]
Revenue	98,873,571	113,602,317	88,103,499
Diamond Hill Funds | Mutual fund administration, net
Disaggregation of Revenue [Line Items]
Revenue	10,170,502	12,056,228	7,262,488
Separately managed accounts, excluding performance-based fees
Disaggregation of Revenue [Line Items]
Revenue	26,200,724	27,882,488	19,772,236
Separately managed accounts, excluding performance-based fees | Investment advisory
Disaggregation of Revenue [Line Items]
Revenue	26,200,724	27,882,488	19,772,236
Separately managed accounts, excluding performance-based fees | Mutual fund administration, net
Disaggregation of Revenue [Line Items]
Revenue	0	0	0
Performance-based fees
Disaggregation of Revenue [Line Items]
Revenue	1,500,225	11,860,051	473,315
Performance-based fees | Investment advisory
Disaggregation of Revenue [Line Items]
Revenue	1,500,225	11,860,051	473,315
Performance-based fees | Mutual fund administration, net
Disaggregation of Revenue [Line Items]
Revenue	0	0	0
Other pooled vehicles
Disaggregation of Revenue [Line Items]
Revenue	9,410,541	10,166,928	7,606,864
Other pooled vehicles | Investment advisory
Disaggregation of Revenue [Line Items]
Revenue	9,410,541	10,166,928	7,606,864
Other pooled vehicles | Mutual fund administration, net
Disaggregation of Revenue [Line Items]
Revenue	0	0	0
Model delivery
Disaggregation of Revenue [Line Items]
Revenue	5,910,061	4,977,234	2,656,487
Model delivery | Investment advisory
Disaggregation of Revenue [Line Items]
Revenue	5,910,061	4,977,234	2,656,487
Model delivery | Mutual fund administration, net
Disaggregation of Revenue [Line Items]
Revenue	0	0	0
Collective investment trusts
Disaggregation of Revenue [Line Items]
Revenue	2,430,395	1,648,591	512,829
Collective investment trusts | Investment advisory
Disaggregation of Revenue [Line Items]
Revenue	2,430,395	1,648,591	512,829
Collective investment trusts | Mutual fund administration, net
Disaggregation of Revenue [Line Items]
Revenue	$ 0	$ 0	$ 0

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
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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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