Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Operating Revenues
Operating Revenues	$ 4,911,563	$ 4,790,904	$ 4,414,877
Operating Costs and Expenses
Selling, general and administrative	1,110,198	1,076,875	1,007,381
Depreciation of property, plant and equipment	80,366	87,046	86,064
Amortization of intangible assets	32,040	37,119	50,039
Impairment of goodwill and other long-lived assets	12,335	49,822	99,066
Total Operating Costs and Expenses	4,676,616	4,575,400	4,345,484
Income from Operations	234,947	215,504	69,393
Equity in earnings (losses) of affiliates, net	16,394	(3,303)	(5,183)
Interest income	8,257	9,868	7,122
Interest expense	(118,787)	(186,149)	(63,301)
Non-operating pension and postretirement benefit income, net	127,539	794,949	133,812
Gain on marketable equity securities, net	200,170	181,295	138,067
Other (expense) income, net	(18,853)	12,546	19,094
Income Before Income Taxes	449,667	1,024,710	299,004
Provision for Income Taxes	146,400	292,100	87,300
Net Income	303,267	732,610	211,704
Net Income Attributable to Noncontrolling Interests	(10,976)	(7,976)	(6,416)
Net Income Attributable to Graham Holdings Company Common Stockholders	$ 292,291	$ 724,634	$ 205,288
Per Share Information Attributable to Graham Holdings Company Common Stockholders
Basic net income per common share (in USD per share)	$ 67.11	$ 164.62	$ 43.96
Basic average number of common shares outstanding (in shares)	4,331	4,372	4,639
Diluted net income per common share (in USD per share)	$ 66.47	$ 163.40	$ 43.82
Diluted average number of common shares outstanding (in shares)	4,373	4,405	4,654
Services [Member]
Operating Revenues
Operating Revenues	$ 2,664,808	$ 2,697,314	$ 2,484,327
Operating Costs and Expenses
Cost of services and goods	1,570,547	1,558,639	1,468,114
Goods [Member]
Operating Revenues
Operating Revenues	2,246,755	2,093,590	1,930,550
Operating Costs and Expenses
Cost of services and goods	$ 1,871,130	$ 1,765,899	$ 1,634,820