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Investment Portfolio - Summary of Market Value of Investments (Detail) (USD $) | Jun. 30, 2014 | Dec. 31, 2013
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Investment Holdings [Line Items] |  |
Total Investment Portfolio | $ 36,091,706 | $ 18,726,070
Deferred compensation | 5,394,414 | 1,287,745
Diamond Hill Small Cap Fund |  |
Investment Holdings [Line Items] |  |
Total Investment Portfolio | 96,610 | 0
Diamond Hill Small-Mid Cap Fund |  |
Investment Holdings [Line Items] |  |
Total Investment Portfolio | 97,081 | 0
Diamond Hill Mid Cap Fund |  |
Investment Holdings [Line Items] |  |
Total Investment Portfolio | 10,767,562 | 0
Diamond Hill Large Cap Fund |  |
Investment Holdings [Line Items] |  |
Total Investment Portfolio | 1,306,268 | 0
Diamond Hill Select Fund |  |
Investment Holdings [Line Items] |  |
Total Investment Portfolio | 697,723 | 0
Diamond Hill Long-Short Fund |  |
Investment Holdings [Line Items] |  |
Total Investment Portfolio | 1,486,841 | 1,287,745
Diamond Hill Financial Long-Short Fund |  |
Investment Holdings [Line Items] |  |
Total Investment Portfolio | 1,212,758 | 1,131,034
Diamond Hill Research Opportunities Fund |  |
Investment Holdings [Line Items] |  |
Total Investment Portfolio | 14,869,322 | 13,305,830
Diamond Hill Strategic Income Fund |  |
Investment Holdings [Line Items] |  |
Total Investment Portfolio | 815,172 | 0
Diamond Hill Investment Partners, L.P. |  |
Investment Holdings [Line Items] |  |
Total Investment Portfolio | 1,234 | 1,133
Diamond Hill Global Fund, L.P. |  |
Investment Holdings [Line Items] |  |
Total Investment Portfolio | 1,519,657 | 0
Diamond Hill Valuation-Weighted 500, L.P. |  |
Investment Holdings [Line Items] |  |
Total Investment Portfolio | $ 3,221,478 | $ 3,000,328

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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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