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Investment Portfolio (Tables)

12 Months Ended

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