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Investment Portfolio (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Market value of investments
Total Investment Portfolio	$ 15,363,288	$ 8,208,489
Diamond Hill Small Cap Fund [Member]
Market value of investments
Total Investment Portfolio	207,938	189,042
Diamond Hill Small-Mid Cap Fund [Member]
Market value of investments
Total Investment Portfolio	224,087	203,571
Diamond Hill Large Cap Fund [Member]
Market value of investments
Total Investment Portfolio	231,732	213,110
Diamond Hill Select Fund [Member]
Market value of investments
Total Investment Portfolio	233,891	214,833
Diamond Hill Long-Short Fund [Member]
Market value of investments
Total Investment Portfolio	229,166	212,720
Diamond Hill Research Opportunities Fund [Member]
Market value of investments
Total Investment Portfolio	10,287,142
Diamond Hill Strategic Income Fund [Member]
Market value of investments
Total Investment Portfolio	211,903	197,284
Diamond Hill Investment Partners, L.P. [Member]
Market value of investments
Total Investment Portfolio	165,473	156,122
Diamond Hill Investment Partners II, L.P. [Member]
Market value of investments
Total Investment Portfolio	134,152	131,203
Diamond Hill Research Partners, L.P. [Member]
Market value of investments
Total Investment Portfolio		5,770,874
Diamond Hill Research Partners International, L.P. [Member]
Market value of investments
Total Investment Portfolio	1,309,749	919,730
Diamond Hill Valuation Based Index L. P. [Member]
Market value of investments
Total Investment Portfolio	$ 2,128,055