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Business and Organization	9 Months Ended
Business and Organization	Sep. 30, 2016
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"), an Ohio corporation, is a wholly owned subsidiary of the Company. BHFS provided compliance, treasury, and other fund administration services to investment advisers and mutual funds. BHIL Distributors, Inc. ("BHIL"), an Ohio corporation, was a wholly owned subsidiary of BHFS. BHIL provided underwriting services to mutual funds. BHFS and BHIL collectively operated as "Beacon Hill". On July 31, 2016, the Company sold BHIL and certain assets and liabilities of BHFS to Foreside Financial Group, LLC (“Foreside”). The entirety of Beacon Hill's business was transferred to Foreside in the sale. See Note 10.