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Business and Organization (Notes)	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business and Organization	Business and Organization Diamond Hill Investment Group, Inc. (the “Company”), an Ohio corporation, derives its consolidated revenues 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 to the Diamond Hill Funds (the “Funds”), a series of open-end mutual funds, private investment funds (“Private Funds”), an exchange traded fund (the “ETF”), and other institutional accounts. In addition, DHCM is administrator for the Funds. Beacon Hill Fund Services, Inc. (“BHFS”) and BHIL Distributors, Inc. (“BHIL”), collectively operated as “Beacon Hill,” were former operating subsidiaries of the Company. The Company sold Beacon Hill on July 31, 2016. Prior to the sale, Beacon Hill provided compliance, treasury, underwriting and other fund administration services to investment advisers and mutual funds. See Note 11 for additional information regarding the sale of Beacon Hill.

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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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