Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 1,134	$ (1,466)	$ 3,265	$ 72
Adjustments for changes in:
Foreign currency translation	(8,745)	(2,499)	(19,787)	(2,041)
Unrecognized employee benefit costs (including effects of foreign currency translation)	891	275	1,441	247
Fair value of cash flow hedges	(251)	(8)	(809)	547
Reclassification adjustments for items included in net income (loss):
Amortization of unrecognized employee benefit costs	281	457	833	1,371
Settlements of cash flow hedges	367	(304)	108	(1,024)
Other comprehensive loss	(7,457)	(2,079)	(18,214)	(900)
Comprehensive loss	(6,323)	(3,545)	(14,949)	(828)
Less: Comprehensive (loss) income attributable to noncontrolling interest	(269)	124	(625)	534
Comprehensive loss attributable to Ampco-Pittsburgh	$ (6,054)	$ (3,669)	$ (14,324)	$ (1,362)