Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 74,506	$ (21,134)	$ 181,018	$ 156,014
Foreign currency translation adjustments:
Translation adjustments arising during the period	31,469	(19,474)	21,702	(8,096)
Adjustment for sale of a business with foreign operations	(765)	0	(765)	0
Total foreign currency translation adjustments	30,704	(19,474)	20,937	(8,096)
Pension and other postretirement plans:
Amortization of net prior service (credit) cost included in net income	(487)	410	(1,463)	1,230
Amortization of net actuarial gain included in net income	(12,360)	(10,473)	(37,080)	(31,673)
Total pension and other postretirement plans, before tax	(12,847)	(10,063)	(38,543)	(30,443)
Cash flow hedges loss	(1,975)	(3,824)	(518)	(3,566)
Other Comprehensive Income (Loss), Before Tax	15,882	(33,361)	(18,124)	(42,105)
Income tax benefit related to items of other comprehensive income (loss)	3,803	3,468	10,002	8,651
Other Comprehensive Income (Loss), Net of Tax	19,685	(29,893)	(8,122)	(33,454)
Comprehensive Income (Loss)	94,191	(51,027)	172,896	122,560
Comprehensive income attributable to noncontrolling interests	(2,003)	(1,897)	(5,175)	(3,985)
Total Comprehensive (Loss) Income Attributable to Graham Holdings Company	$ 92,188	$ (52,924)	$ 167,721	$ 118,575