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Significant Accounting Policies - Revenue From Contracts with Customers (Details) - USD ($) | 12 Months Ended
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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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- Definition 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 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI https://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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