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Business and Organization	6 Months Ended
Business and Organization	Jun. 30, 2015
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"), 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 to mutual funds. BHFS and BHIL collectively operate as "Beacon Hill".