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Summary of Company Information	6 Months Ended
Summary of Company Information	Jun. 30, 2012
Summary of Company Information [Abstract]
Summary of Company Information	Summary of Company Information Business Core-Mark Holding Company, Inc. and subsidiaries (referred herein as “we,” “us,” “our,” “the Company” or “Core-Mark”) is one of the largest marketers of fresh and broad-line supply solutions to the convenience retail industry in North America. We offer a full range of products, marketing programs and technology solutions to approximately 29,000 customer locations in the United States (“U.S.”) and Canada. Our customers include traditional convenience stores, grocery stores, drug stores, liquor stores and other specialty and small format stores that carry convenience products. Our product offering includes cigarettes, other tobacco products, candy, snacks, fast food, groceries, fresh products, dairy, bread, beverages, general merchandise and health and beauty care products. We operate a network of 27 distribution centers (excluding two distribution facilities we operate as a third party logistics provider) in the U.S. and Canada.