Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 211,704	$ 70,434	$ 353,327
Foreign currency translation adjustments:
Translation adjustments arising during the year	21,927	(48,340)	(16,052)
Pension and other postretirement plans:
Actuarial gain (loss)	380,593	(727,097)	519,595
Prior service credit (cost)	11,263	0	(2)
Amortization of net actuarial gain included in net income	(42,146)	(70,833)	(5,486)
Amortization of net prior service cost included in net income	1,641	2,864	3,170
Settlement included in net income	(1,087)	0	(120)
Total pension and other postretirement plans	350,264	(795,066)	517,157
Cash flow hedges (loss) gain	(5,630)	4,765	349
Other Comprehensive Income (Loss), Before Tax	366,561	(838,641)	501,454
Income tax (expense) benefit related to items of other comprehensive income (loss)	(88,375)	203,404	(133,380)
Other Comprehensive Income (Loss), Net of Tax	278,186	(635,237)	368,074
Comprehensive Income (Loss)	489,890	(564,803)	721,401
Comprehensive income attributable to noncontrolling interests	(6,416)	(3,355)	(1,252)
Total Comprehensive Income (Loss) Attributable to Graham Holdings Company	$ 483,474	$ (568,158)	$ 720,149