Earnings Per Share (Details 1) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Schedule of Earnings Per Share, Basic and Diluted, Including Two Class Method [Line Items]
Net income attributable to Graham Holdings Company common stockholders	$ 52,272	$ 95,624
Less: Dividends paid-common stock outstanding and unvested restricted shares	(15,812)	(15,497)
Undistributed earnings	$ 36,460	$ 80,127
Percent allocated to common stockholders	99.35%	99.35%
Undistributed Earnings Allocated To Common Stockholders	$ 36,225	$ 79,611
Add: Dividends paid-common stock outstanding	15,711	15,397
Numerator for basic earnings per share	51,936	95,008
Add: Additional undistributed earnings due to dilutive stock options	1	1
Numerator for diluted earnings per share	$ 51,937	$ 95,009
Weighted average shares outstanding (shares)	4,759	4,871
Denominator for diluted earnings per share (shares)	4,776	4,885
Graham Holdings Company Common Stockholders:
Basic income per common share (in usd per share)	$ 10.91	$ 19.50
Diluted income per common share (in usd per share)	$ 10.88	$ 19.45
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)	17	14