Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Net Income	$ 30,751	$ 25,721
Foreign currency translation adjustments:
Total foreign currency translation adjustments	(6,248)	14,267
Pension and other postretirement plans:
Amortization of net prior service credit included in net income	(496)	(519)
Amortization of net actuarial gain included in net income	(258)	(379)
Total pension and other postretirement plans, before tax	(754)	(898)
Cash flow hedges gain (loss)	626	(679)
Other Comprehensive (Loss) Income, Before Tax	(6,376)	12,690
Income tax benefit related to items of other comprehensive (loss) income	34	406
Other Comprehensive (Loss) Income, Net of Tax	(6,342)	13,096
Comprehensive Income	24,409	38,817
Comprehensive income attributable to noncontrolling interests	(1,645)	(1,827)
Total Comprehensive Income Attributable to Graham Holdings Company	$ 22,764	$ 36,990