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Significant Accounting Policies - Revenues From Contracts with Customers (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disaggregation of Revenue [Line Items]        
Revenue $ 33,350,637 $ 39,021,114 $ 67,341,140 $ 81,277,500
Investment advisory        
Disaggregation of Revenue [Line Items]        
Revenue 31,500,443 36,408,165 63,542,902 75,687,051
Mutual fund administration, net        
Disaggregation of Revenue [Line Items]        
Revenue 1,850,194 2,612,949 3,798,238 5,590,449
Diamond Hill Funds        
Disaggregation of Revenue [Line Items]        
Revenue 22,771,617 28,060,071 46,103,204 58,292,499
Diamond Hill Funds | Investment advisory        
Disaggregation of Revenue [Line Items]        
Revenue 20,921,423 25,447,122 42,304,966 52,702,050
Diamond Hill Funds | Mutual fund administration, net        
Disaggregation of Revenue [Line Items]        
Revenue 1,850,194 2,612,949 3,798,238 5,590,449
Separately managed accounts        
Disaggregation of Revenue [Line Items]        
Revenue 6,238,511 6,570,811 12,502,872 13,763,101
Separately managed accounts | Investment advisory        
Disaggregation of Revenue [Line Items]        
Revenue 6,238,511 6,570,811 12,502,872 13,763,101
Separately managed accounts | Mutual fund administration, net        
Disaggregation of Revenue [Line Items]        
Revenue 0 0 0 0
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 1,301,391 1,510,245 2,663,144 3,227,409
Model delivery | Investment advisory        
Disaggregation of Revenue [Line Items]        
Revenue 1,301,391 1,510,245 2,663,144 3,227,409
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 836,095 508,271 1,737,216 1,053,766
Collective investment trusts | Investment advisory        
Disaggregation of Revenue [Line Items]        
Revenue 836,095 508,271 1,737,216 1,053,766
Collective investment trusts | Mutual fund administration, net        
Disaggregation of Revenue [Line Items]        
Revenue 0 0 0 0
Other Pooled Vehicles        
Disaggregation of Revenue [Line Items]        
Revenue 2,203,023 2,371,716 4,334,704 4,940,725
Other Pooled Vehicles | Investment advisory        
Disaggregation of Revenue [Line Items]        
Revenue $ 2,203,023 $ 2,371,716 $ 4,334,704 $ 4,940,725