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Significant Accounting Policies - Revenue From Contracts with Customers (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disaggregation of Revenue [Line Items]      
Revenue $ 136,716,371 $ 154,496,019 $ 182,193,837
Investment advisory      
Disaggregation of Revenue [Line Items]      
Revenue 129,179,500 144,325,517 170,137,609
Mutual fund administration, net      
Disaggregation of Revenue [Line Items]      
Revenue 7,536,871 10,170,502 12,056,228
Diamond Hill Funds      
Disaggregation of Revenue [Line Items]      
Revenue 92,347,323 109,044,073 125,658,545
Diamond Hill Funds | Investment advisory      
Disaggregation of Revenue [Line Items]      
Revenue 84,810,452 98,873,571 113,602,317
Diamond Hill Funds | Mutual fund administration, net      
Disaggregation of Revenue [Line Items]      
Revenue 7,536,871 10,170,502 12,056,228
Separately managed accounts, excluding performance-based fees      
Disaggregation of Revenue [Line Items]      
Revenue 24,898,695 26,200,724 27,882,488
Separately managed accounts, excluding performance-based fees | Investment advisory      
Disaggregation of Revenue [Line Items]      
Revenue 24,898,695 26,200,724 27,882,488
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 1,176,351 1,500,225 11,860,051
Performance-based fees | Investment advisory      
Disaggregation of Revenue [Line Items]      
Revenue 1,176,351 1,500,225 11,860,051
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 9,261,533 9,410,541 10,166,928
Other pooled vehicles | Investment advisory      
Disaggregation of Revenue [Line Items]      
Revenue 9,261,533 9,410,541 10,166,928
Other pooled vehicles | Mutual fund administration, net      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Model delivery      
Disaggregation of Revenue [Line Items]      
Revenue 5,211,113 5,910,061 4,977,234
Model delivery | Investment advisory      
Disaggregation of Revenue [Line Items]      
Revenue 5,211,113 5,910,061 4,977,234
Model delivery | Mutual fund administration, net      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Collective investment trusts      
Disaggregation of Revenue [Line Items]      
Revenue 3,821,356 2,430,395 1,648,591
Collective investment trusts | Investment advisory      
Disaggregation of Revenue [Line Items]      
Revenue 3,821,356 2,430,395 1,648,591
Collective investment trusts | Mutual fund administration, net      
Disaggregation of Revenue [Line Items]      
Revenue $ 0 $ 0 $ 0