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Summary of Company Information	12 Months Ended
Summary of Company Information	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Company Information	Summary of Company Information Business Core-Mark Holding Company, Inc. and subsidiaries (referred to herein as “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. The Company offers a full range of products, marketing programs and technology solutions to approximately 43,000 customer locations in the United States (“U.S.”) and Canada. The Company’s customers include traditional convenience stores, drug stores, grocery stores, liquor stores and other specialty and small format stores that carry convenience products. The Company’s product offering includes cigarettes, other tobacco products ("OTP"), candy, snacks, fast food, groceries, fresh products, dairy, bread, beverages, general merchandise and health and beauty care products. The Company operates a network of 30 distribution centers in the U.S. and Canada (excluding two distribution facilities it operates as a third party logistics provider). Twenty-five of the Company’s distribution centers are located in the U.S. and five are located in Canada.