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Investment Portfolio - Summary of Market Value of Investments (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Investment Holdings [Line Items]
Total Investment Portfolio	$ 36,091,706	$ 18,726,070
Deferred compensation	5,394,414	1,287,745
Diamond Hill Small Cap Fund
Investment Holdings [Line Items]
Total Investment Portfolio	96,610	0
Diamond Hill Small-Mid Cap Fund
Investment Holdings [Line Items]
Total Investment Portfolio	97,081	0
Diamond Hill Mid Cap Fund
Investment Holdings [Line Items]
Total Investment Portfolio	10,767,562	0
Diamond Hill Large Cap Fund
Investment Holdings [Line Items]
Total Investment Portfolio	1,306,268	0
Diamond Hill Select Fund
Investment Holdings [Line Items]
Total Investment Portfolio	697,723	0
Diamond Hill Long-Short Fund
Investment Holdings [Line Items]
Total Investment Portfolio	1,486,841	1,287,745
Diamond Hill Financial Long-Short Fund
Investment Holdings [Line Items]
Total Investment Portfolio	1,212,758	1,131,034
Diamond Hill Research Opportunities Fund
Investment Holdings [Line Items]
Total Investment Portfolio	14,869,322	13,305,830
Diamond Hill Strategic Income Fund
Investment Holdings [Line Items]
Total Investment Portfolio	815,172	0
Diamond Hill Investment Partners, L.P.
Investment Holdings [Line Items]
Total Investment Portfolio	1,234	1,133
Diamond Hill Global Fund, L.P.
Investment Holdings [Line Items]
Total Investment Portfolio	1,519,657	0
Diamond Hill Valuation-Weighted 500, L.P.
Investment Holdings [Line Items]
Total Investment Portfolio	$ 3,221,478	$ 3,000,328

X

- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

+ References

No definition available.

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X

- Definition

Sum of the carrying amounts as of the balance sheet date of all investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(h))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph h

-Article 7

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