Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (38,119)	$ 3,980
Adjustments for changes in:
Foreign currency translation	3,009	(11,848)
Unrecognized employee benefit costs (including effects of foreign currency translation)	(6,976)	6,825
Fair value of cash flow hedges	4	(512)
Reclassification adjustments for items included in net (loss) income:
Amortization of unrecognized employee benefit costs	(891)	1,115
Settlement of cash flow hedges	30	387
Other comprehensive loss	(4,824)	(4,033)
Comprehensive loss	(42,943)	(53)
Less: Comprehensive income (loss) attributable to noncontrolling interest	1,562	(163)
Comprehensive (loss) income attributable to Ampco-Pittsburgh	$ (44,505)	$ 110