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Investment Portfolio - Summary of Market Value of Investments (Detail) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Investment Holdings [Line Items]
Total Investment Portfolio	$ 21,148,293	$ 16,503,731
Diamond Hill Small Cap Fund [Member]
Investment Holdings [Line Items]
Total Investment Portfolio	260,457	215,550
Diamond Hill Small-Mid Cap Fund [Member]
Investment Holdings [Line Items]
Total Investment Portfolio	290,443	239,316
Diamond Hill Large Cap Fund [Member]
Investment Holdings [Line Items]
Total Investment Portfolio	292,526	246,744
Diamond Hill Select Fund [Member]
Investment Holdings [Line Items]
Total Investment Portfolio	298,925	242,252
Diamond Hill Long-Short Fund [Member]
Investment Holdings [Line Items]
Total Investment Portfolio	1,166,467	1,036,045
Diamond Hill Financial Long-Short Fund [Member]
Investment Holdings [Line Items]
Total Investment Portfolio	1,969,770
Diamond Hill Research Opportunities Fund [Member]
Investment Holdings [Line Items]
Total Investment Portfolio	12,667,255	10,658,665
Diamond Hill Strategic Income Fund [Member]
Investment Holdings [Line Items]
Total Investment Portfolio	210,941	214,598
Diamond Hill Investment Partners, L.P. [Member]
Investment Holdings [Line Items]
Total Investment Portfolio	8,675	7,336
Diamond Hill Research Partners-International, L.P. [Member]
Investment Holdings [Line Items]
Total Investment Portfolio	1,434,111	1,384,976
Diamond Hill Valuation-Weighted 500, L.P. [Member]
Investment Holdings [Line Items]
Total Investment Portfolio	$ 2,548,723	$ 2,258,249