Earnings Per Share (Details 1) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Schedule of Earnings Per Share, Basic and Diluted, Including Two Class Method [Line Items]
Net income attributable to Graham Holdings Company common stockholders	$ 32,780	$ 39,586	$ 60,919	$ 267,394
Less: Dividends-common stock outstanding and unvested restricted shares	(7,575)	(7,496)	(30,728)	(30,155)
Undistributed earnings	$ 25,205	$ 32,090	$ 30,191	$ 237,239
Percent allocated to common stockholders	99.41%	99.32%	99.41%	99.32%
Undistributed Earnings Allocated To Common Stockholders	$ 25,058	$ 31,872	$ 30,015	$ 235,633
Add: Dividends-common stock outstanding	7,529	7,447	30,549	29,953
Numerator for basic earnings per share	32,587	39,319	60,564	265,586
Add: Additional undistributed earnings due to dilutive stock options	1	1	0	5
Numerator for diluted earnings per share	$ 32,588	$ 39,320	$ 60,564	$ 265,591
Weighted average shares outstanding (shares)	4,808	4,961	4,841	4,966
Denominator for diluted earnings per share (shares)	4,820	4,977	4,853	4,980
Graham Holdings Company Common Stockholders:
Basic income per common share (in usd per share)	$ 6.78	$ 7.93	$ 12.51	$ 53.49
Diluted income per common share (in usd per share)	$ 6.76	$ 7.90	$ 12.48	$ 53.33
Stock Option Plan [Member]
Schedule of Earnings Per Share, Basic and Diluted, Including Two Class Method [Line Items]
Add: Effect of dilutive stock options (shares)	12	16	12	14