Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Operating Revenues
Operating Revenues	$ 1,235,992	$ 1,165,915
Operating Costs and Expenses
Selling, general and administrative	277,481	270,706
Depreciation of property, plant and equipment	18,394	20,554
Amortization of intangible assets	6,055	7,824
Impairment of goodwill and asset group held for sale	19,029	0
Total Operating Costs and Expenses	1,178,159	1,118,442
Income from Operations	57,833	47,473
Equity in earnings (losses) of affiliates, net	34,850	(8,428)
Interest income	2,475	2,500
Interest expense	(16,229)	(82,277)
Non-operating pension and postretirement benefit income, net	31,073	34,617
(Loss) gain on marketable equity securities, net	(68,923)	43,801
Other expense, net	(428)	(4,065)
Income Before Income Taxes	40,651	33,621
Provision for Income Taxes	9,900	7,900
Net Income	30,751	25,721
Net Income Attributable to Noncontrolling Interests	(1,645)	(1,827)
Net Income Attributable to Graham Holdings Company Common Stockholders	$ 29,106	$ 23,894
Per Share Information Attributable to Graham Holdings Company Common Stockholders
Basic net income per common share (in USD per share)	$ 6.68	$ 5.50
Basic average number of common shares outstanding (in shares)	4,331	4,320
Diluted net income per common share (in USD per share)	$ 6.62	$ 5.45
Diluted average number of common shares outstanding (in shares)	4,375	4,358
Services [Member]
Operating Revenues
Operating Revenues	$ 673,799	$ 647,507
Operating Costs and Expenses
Cost of services and goods	394,993	386,136
Goods [Member]
Operating Revenues
Operating Revenues	562,193	518,408
Operating Costs and Expenses
Cost of services and goods	$ 462,207	$ 433,222