(Loss) Earnings Per Share (Details 1) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Schedule of Earnings Per Share, Basic and Diluted, Including Two Class Method [Line Items]
Net (loss) income attributable to Graham Holdings Company common stockholders	$ (21,040)	$ 122,788	$ 103,340	$ 175,060
Less: Dividends paid-common stock outstanding and unvested restricted shares	(7,574)	(7,722)	(22,926)	(23,534)
Undistributed (loss) earnings	$ (28,614)	$ 115,066	$ 80,414	$ 151,526
Percent allocated to common stockholders (1)	100.00%	99.37%	99.32%	99.37%
Undistributed (Loss) Earnings Allocated To Common Stockholders	$ (28,614)	$ 114,337	$ 79,869	$ 150,566
Add: Dividends paid-common stock outstanding	7,523	7,673	22,772	23,388
Numerator for basic (loss) earnings per share	(21,091)	122,010	102,641	173,954
Add: Additional undistributed earnings due to dilutive stock options	0	2	3	3
Numerator for diluted (loss) earnings per share	$ (21,091)	$ 122,012	$ 102,644	$ 173,957
Weighted average shares outstanding (shares)	4,401	4,700	4,416	4,729
Denominator for diluted (loss) earnings per share (shares)	4,401	4,713	4,442	4,744
Graham Holdings Company Common Stockholders:
Basic income (loss) per common share (in usd per share)	$ (4.79)	$ 25.96	$ 23.24	$ 36.78
Diluted (loss) income per common share (in usd per share)	$ (4.79)	$ 25.89	$ 23.11	$ 36.67
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)	0	13	26	15