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Investment Portfolio (Tables)

9 Months Ended

Sep. 30, 2012

Investment Portfolio [Abstract]

Summary of market value of investments


		September 30,				December 31,
		2012				2011
Diamond Hill Small Cap Fund		$	218,629			$	189,042
Diamond Hill Small-Mid Cap Fund			237,865				203,571
Diamond Hill Large Cap Fund			248,974				213,110
Diamond Hill Select Fund			246,898				214,833
Diamond Hill Long-Short Fund			241,532				212,720
Diamond Hill Research Opportunities Fund^(a)			10,618,026				—
Diamond Hill Strategic Income Fund			214,213				197,284
Diamond Hill Investment Partners, L.P.			7,015				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.			1,356,375				919,730
Diamond Hill Valuation-Based Index, L.P.			2,280,712				—

Total Investment Portfolio		$	15,670,239			$	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
		September 30, 2012				December 31, 2011
Total partnership assets		$	102,336,078			$	130,880,368
Total partnership liabilities			16,773,171				21,570,822

Net partnership assets		$	85,562,907			$	109,309,546
DHCM’s portion of net assets		$	3,644,102			$	6,977,929

		For the Nine Months Ended September 30, 2012				For the Year Ended December 31, 2011
Net partnership income (loss)		$	11,548,485			$	(11,007,617	)
DHCM’s portion of net income (loss)		$	466,201			$	(75,082	)