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Investment Portfolio (Tables) | 12 Months Ended
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Dec. 31, 2012
Investment Portfolio [Abstract] |
Summary of market value of investments |
|  | As of December 31, |
|  | 2012 |  |  | 2011 |
Diamond Hill Small Cap Fund |  | $ | 215,550 |  |  | $ | 189,042 |
Diamond Hill Small-Mid Cap Fund |  |  | 239,316 |  |  |  | 203,571 |
Diamond Hill Large Cap Fund |  |  | 246,744 |  |  |  | 213,110 |
Diamond Hill Select Fund |  |  | 242,252 |  |  |  | 214,833 |
Diamond Hill Long-Short Fund |  |  | 1,036,045 |  |  |  | 212,720 |
Diamond Hill Research Opportunities Fund (a) |  |  | 10,658,665 |  |  |  | — |
Diamond Hill Strategic Income Fund |  |  | 214,598 |  |  |  | 197,284 |
Diamond Hill Investment Partners, L.P. |  |  | 7,336 |  |  |  | 156,122 |
Diamond Hill Investment Partners II, L.P. (b) |  |  | — |  |  |  | 131,203 |
Diamond Hill Research Partners L.P. (a) |  |  | — |  |  |  | 5,770,874 |
Diamond Hill Research Partners—International, L.P. |  |  | 1,384,976 |  |  |  | 919,730 |
Diamond Hill Valuation-Based Index, L.P. |  |  | 2,258,249 |  |  |  | — |
Total Investment Portfolio |  | $ | 16,503,731 |  |  | $ | 8,208,489 |
(a) | Effective January 3, 2012, Diamond Hill Research Partners, L.P. converted to Diamond Hill Research Opportunities Fund, a series of the Diamond Hill Funds.
(b) | On July 18, 2012, Diamond Hill Investment Partners II, L.P. was liquidated.
Carrying value and income from the Partnerships |
|  | As of December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Total partnership assets |  | $ | 105,472,952 |  |  | $ | 130,880,368 |  |  | $ | 173,007,238 |
Total partnership liabilities |  |  | 17,786,579 |  |  |  | 21,570,822 |  |  |  | 32,855,190 |
Net partnership assets |  |  | 87,686,373 |  |  |  | 109,309,546 |  |  |  | 140,152,048 |
DHCM’s portion of net assets |  |  | 3,650,561 |  |  |  | 6,977,929 |  |  |  | 10,261,062 |
|  | For the Year Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Net partnership income (loss) |  |  | 15,054,951 |  |  |  | (11,007,617 | ) |  |  | 4,486,719 |
DHCM’s portion of net income (loss) |  |  | 472,659 |  |  |  | (75,082 | ) |  |  | 939,265 |

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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=6955306&loc=d3e611225-123010 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Article 12 + Details
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