Earnings (Loss) Per Share (Details 1) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Schedule of Earnings Per Share, Basic and Diluted, Including Two Class Method [Line Items]
Net income (loss) attributable to Graham Holdings Company common stockholders	$ 122,788	$ (67,485)	$ 175,060	$ 28,139
Less: Dividends paid-common stock outstanding and unvested restricted shares	(7,722)	(7,656)	(23,534)	(23,153)
Undistributed earnings (loss)	$ 115,066	$ (75,141)	$ 151,526	$ 4,986
Percent allocated to common stockholders (1)	99.37%	100.00%	99.37%	99.40%
Undistributed Earnings (Loss) Allocated To Common Stockholders	$ 114,337	$ (75,141)	$ 150,566	$ 4,956
Add: Dividends paid-common stock outstanding	7,673	7,610	23,388	23,016
Numerator for basic earnings (loss) per share	122,010	(67,531)	173,954	27,972
Add: Additional undistributed earnings due to dilutive stock options	2	0	3	0
Numerator for diluted earnings (loss) per share	$ 122,012	$ (67,531)	$ 173,957	$ 27,972
Weighted average shares outstanding (shares)	4,700	4,842	4,729	4,857
Denominator for diluted earnings (loss) per share (shares)	4,713	4,842	4,744	4,870
Graham Holdings Company Common Stockholders:
Basic income (loss) per common share (in usd per share)	$ 25.96	$ (13.95)	$ 36.78	$ 5.76
Diluted income (loss) per common share (in usd per share)	$ 25.89	$ (13.95)	$ 36.67	$ 5.74
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)	13	0	15	13