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Organization and Nature of Operations	12 Months Ended
Organization and Nature of Operations	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Nature of Operations	ORGANIZATION AND NATURE OF OPERATIONS Graham Holdings Company (the Company), is a diversified education and media company. The Company’s Kaplan subsidiary provides a wide variety of educational services, both domestically and outside the United States. The Company’s media operations comprise the ownership and operation of seven television broadcasting stations. Education—Kaplan, Inc. provides an extensive range of educational services for students and professionals. Kaplan’s various businesses comprise three categories: Higher Education (KHE), Test Preparation (KTP) and Kaplan International. Media—The Company’s diversified media operations comprise television broadcasting, several websites and print publications, and a marketing solutions provider. Television broadcasting. As of December 31, 2017, the Company owned seven television stations located in Houston, TX; Detroit, MI; Orlando, FL; San Antonio, TX; Roanoke, VA; and two stations in Jacksonville, FL. All stations are network-affiliated except for WJXT in Jacksonville, FL. Other—The Company’s other business operations include home health and hospice services and manufacturing.