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Investment Portfolio (Tables)

3 Months Ended

Mar. 31, 2013

Investment Portfolio [Abstract]

Summary of market value of investments


		March 31, 2013				December 31, 2012
Diamond Hill Small Cap Fund		$	251,304			$	215,550
Diamond Hill Small-Mid Cap Fund			279,021				239,316
Diamond Hill Large Cap Fund			275,432				246,744
Diamond Hill Select Fund			278,021				242,252
Diamond Hill Long-Short Fund			1,125,816				1,036,045
Diamond Hill Research Opportunities Fund			12,046,118				10,658,665
Diamond Hill Strategic Income Fund			215,175				214,598
Diamond Hill Investment Partners, L.P.			8,267				7,336
Diamond Hill Research Partners—International, L.P.			1,438,872				1,384,976
Diamond Hill Valuation-Weighted 500, L.P.^(a)			2,475,130				2,258,249

Total Investment Portfolio		$	18,393,156			$	16,503,731

(a)	Diamond Hill Valuation-Weighted 500, L.P. was formerly Diamond Hill Valuation-Based Index, L.P.

Carrying value and income from the Partnerships


		As of
		March 31, 2013				December 31, 2012
Total partnership assets		$	118,895,434			$	105,472,952
Total partnership liabilities			21,239,354				17,786,579

Net partnership assets		$	97,656,080			$	87,686,373
DHCM’s portion of net assets		$	3,922,269			$	3,650,561

		For the Three Months Ended March 31, 2013				For the Year Ended December 31, 2012
Net partnership income		$	10,664,931			$	15,054,951
DHCM’s portion of net income		$	271,448			$	472,659