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Business and Organization	6 Months Ended
	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business and Organization	Business and OrganizationDiamond Hill Investment Group, Inc. (the "Company"), an Ohio corporation, derives consolidated revenue and net income from investment advisory and fund administration services. Diamond Hill Capital Management, Inc. ("DHCM"), an Ohio corporation, is a wholly owned subsidiary of the Company and a registered investment adviser. DHCM is the investment adviser and administrator for the Diamond Hill Funds (the "Funds"), a series of open-end mutual funds. DHCM also provides investment advisory services to a private investment fund, separately managed accounts, and other mutual funds.

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- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-URI http://asc.fasb.org/topic&trid=2122149

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-URI http://asc.fasb.org/topic&trid=2197479

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