Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 2,351	$ (38,119)
Adjustments for changes in:
Foreign currency translation	(4,530)	3,009
Unrecognized employee benefit costs (including effects of foreign currency translation)	1,359	(6,976)
Fair value of cash flow hedges	(40)	4
Reclassification adjustments for items included in net income (loss):
Amortization of unrecognized employee benefit costs	(725)	(891)
Settlement of cash flow hedges	(248)	30
Other comprehensive loss	(4,184)	(4,824)
Comprehensive loss	(1,833)	(42,943)
Less: Comprehensive income attributable to noncontrolling interest	1,576	1,562
Comprehensive loss attributable to Ampco-Pittsburgh	$ (3,409)	$ (44,505)