Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net (Loss) Income	$ (18,827)	$ 124,171	$ 106,512	$ 177,148
Foreign currency translation adjustments:
Translation adjustments arising during the period	3,517	2,384	(9,767)	11,378
Pension and other postretirement plans:
Amortization of net prior service (credit) cost included in net income	(482)	411	(976)	820
Amortization of net actuarial gain included in net income	(11,733)	(10,434)	(24,720)	(21,200)
Total pension and other postretirement plans, before tax	(12,215)	(10,023)	(25,696)	(20,380)
Cash flow hedges gain	346	1,188	1,457	258
Other Comprehensive Loss, Before Tax	(8,352)	(6,451)	(34,006)	(8,744)
Income tax benefit related to items of other comprehensive loss	3,037	2,305	6,199	5,183
Other Comprehensive Loss, Net of Tax	(5,315)	(4,146)	(27,807)	(3,561)
Comprehensive (Loss) Income	(24,142)	120,025	78,705	173,587
Comprehensive income attributable to noncontrolling interests	(2,213)	(1,383)	(3,172)	(2,088)
Total Comprehensive (Loss) Income Attributable to Graham Holdings Company	$ (26,355)	$ 118,642	$ 75,533	$ 171,499