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Investment Portfolio | 12 Months Ended
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Dec. 31, 2012
Investment Portfolio [Abstract] |
Investment Portfolio | Note 3 Investment Portfolio As of December 31, 2012, the Company held investments excluding money market funds, included with cash and cash equivalents, worth $16.5 million and an estimated cost basis of $12.4 million. The following table summarizes the market value of these investments for the last two fiscal years:
|  | 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.
DHCM is the managing member of Diamond Hill General Partner LLC, which is the general partner of the Partnerships. The underlying assets of the Partnerships are cash and marketable equity securities. Summary financial information, including the Company’s carrying value and income from the Partnerships, is as follows:
|  | 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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