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Business and Organization	6 Months Ended
Business and Organization	Jun. 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. The Company has three operating subsidiaries. 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 provides compliance, treasury, and other fund administration services to investment advisers and mutual funds. BHIL Distributors, Inc. ("BHIL"), an Ohio corporation, is a wholly owned subsidiary of BHFS. BHIL provides underwriting services to mutual funds. BHFS and BHIL collectively operate as "Beacon Hill". On June 15, 2016, the Company entered into a definitive agreement with Foreside Financial Group, LLC (“Foreside”), to sell BHIL and certain assets and liabilities of BHFS to Foreside. This transaction will result in the entirety of Beacon Hill’s business being transferred to Foreside. The completion of the transaction is subject to customary closing conditions and although there can be no assurance, we expect the transaction to close on July 31, 2016. See Note 10.