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Business and Organization | 12 Months Ended
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Dec. 31, 2012
Business and Organization [Abstract] |
Business and Organization | Note 1 Business and Organization Diamond Hill Investment Group, Inc. (the “Company”) derives its consolidated revenues and net income primarily 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 and certain private investment funds (“Private Funds”), and also offers advisory services to institutional and individual investors. Diamond Hill GP (Cayman) Ltd. (“DHGP”), which was organized for the purpose of acting as the general partner of a Cayman Islands exempted limited partnership sponsored by the Company, was dissolved during the third quarter of 2012. DHGP had no operating activity. Beacon Hill Fund Services, Inc. (“BHFS”), an Ohio corporation, is a wholly owned subsidiary of the Company. BHFS provides certain compliance, treasury, and fund administration services to mutual fund companies. BHIL Distributors, Inc. (“BHIL”), an Ohio corporation, is a wholly owned subsidiary of BHFS. BHIL provides underwriting and distribution services to mutual fund companies. BHFS and BHIL collectively operate as Beacon Hill.

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