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Investment Portfolio - Summary of Cash and Cash Equivalent Investments, Excluding Money Market Funds (Details) (USD $) | Dec. 31, 2013 | Dec. 31, 2012
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Summary of market value of investments |  |  |  |
Total Investment Portfolio | $ 18,726,070 |  | $ 16,503,731 |
Diamond Hill Small Cap Fund |  |  |  |
Summary of market value of investments |  |  |  |
Total Investment Portfolio | 0 |  | 215,550 |
Diamond Hill Small-Mid Cap Fund |  |  |  |
Summary of market value of investments |  |  |  |
Total Investment Portfolio | 0 |  | 239,316 |
Diamond Hill Large Cap Fund |  |  |  |
Summary of market value of investments |  |  |  |
Total Investment Portfolio | 0 |  | 246,744 |
Diamond Hill Select Fund |  |  |  |
Summary of market value of investments |  |  |  |
Total Investment Portfolio | 0 |  | 242,252 |
Diamond Hill Long-Short Fund |  |  |  |
Summary of market value of investments |  |  |  |
Total Investment Portfolio | 1,287,745 |  | 1,036,045 |
Diamond Hill Financial Long-Short Fund |  |  |  |
Summary of market value of investments |  |  |  |
Total Investment Portfolio | 1,131,034 |  | 0 |
Diamond Hill Research Opportunities Fund |  |  |  |
Summary of market value of investments |  |  |  |
Total Investment Portfolio | 13,305,830 |  | 10,658,665 |
Diamond Hill Strategic Income Fund |  |  |  |
Summary of market value of investments |  |  |  |
Total Investment Portfolio | 0 |  | 214,598 |
Diamond Hill Investment Partners, L.P. |  |  |  |
Summary of market value of investments |  |  |  |
Total Investment Portfolio | 1,133 |  | 7,336 |
Diamond Hill Global Fund, L.P.(a) |  |  |  |
Summary of market value of investments |  |  |  |
Total Investment Portfolio | 0 | [1] | 1,384,976 | [1]
Diamond Hill Valuation-Weighted 500, L.P. |  |  |  |
Summary of market value of investments |  |  |  |
Total Investment Portfolio | $ 3,000,328 |  | $ 2,258,249 |
[1] | Diamond Hill Global Fund, L.P. ("DHGF"), formerly Diamond Hill Research Partners – International, L.P.

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- Definition Sum of the carrying amounts as of the balance sheet date of all investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(h)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph h -Article 7 + Details
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