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Investment Portfolio (Tables) | 6 Months Ended
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Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract] |
Summary of Market Value of Investments | The following table summarizes the fair value of these investments as of June 30, 2015 and December 31, 2014:
| As of
| June 30, 2015 |  | December 31, 2014
Seed Capital Investments: |  |  |
Diamond Hill Research Opportunities Fund | $ | 12,221,928 |  |  | $ | 13,143,281 |
Diamond Hill Mid Cap Fund | 11,229,859 |  |  | 10,729,930 |
Diamond Hill Financial Long-Short Fund | 1,232,264 |  |  | 1,222,892 |
Diamond Hill Valuation-Weighted 500 ETF(a) | 6,644,763 |  |  | — |
Diamond Hill Valuation-Weighted 500, L.P.(a) | — |  |  | 3,398,035 |
Diamond Hill High Yield Fund, L.P. | 10,238,133 |  |  | 9,764,814 |
Diamond Hill Global Fund, L.P. | 1,582,619 |  |  | 1,489,740 |
Total Seed Capital Investments | 43,149,566 |  |  | 39,748,692 |
Deferred Compensation Investments | 10,211,281 |  |  | 5,678,764 |
Total Investment Portfolio | $ | 53,360,847 |  |  | $ | 45,427,456 |
(a) During the period, the Company converted the Diamond Hill Valuation-Weighted 500, L.P. to the Diamond Hill Valuation-Weighted 500 ETF by liquidating its investment in the partnership and purchasing into the Diamond Hill Valuation-Weighted 500 ETF.

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- Definition Tabular disclosure of the summary of investment holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010 + Details
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