Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ (21,134)	$ 33,840	$ 156,014	$ 63,791
Foreign currency translation adjustments:
Translation adjustments arising during the period	(19,474)	(44,260)	(8,096)	(86,926)
Pension and other postretirement plans:
Amortization of net prior service cost included in net income	410	716	1,230	2,148
Amortization of net actuarial gain included in net income	(10,473)	(18,083)	(31,673)	(53,939)
Total pension and other postretirement plans, before tax	(10,063)	(17,367)	(30,443)	(51,791)
Cash flow hedges (losses) gains	(3,824)	2,202	(3,566)	4,935
Other Comprehensive Loss, Before Tax	(33,361)	(59,425)	(42,105)	(133,782)
Income tax benefit related to items of other comprehensive loss	3,468	3,970	8,651	12,213
Other Comprehensive Loss, Net of Tax	(29,893)	(55,455)	(33,454)	(121,569)
Comprehensive (Loss) Income	(51,027)	(21,615)	122,560	(57,778)
Comprehensive income attributable to noncontrolling interests	(1,897)	(1,060)	(3,985)	(2,872)
Total Comprehensive (Loss) Income Attributable to Graham Holdings Company	$ (52,924)	$ (22,675)	$ 118,575	$ (60,650)