Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 522	$ 1,224	$ 2,131	$ 1,538
Adjustments for changes in:
Foreign currency translation	(8,428)	1,314	(11,042)	458
Unrecognized employee benefit costs (including effects of foreign currency translation)	(404)	85	(550)	28
Fair value of cash flow hedges	(1,001)	245	(558)	555
Reclassification adjustments for items included in net income:
Amortization of unrecognized employee benefit costs	187	552	552	914
Settlements of cash flow hedges	164	389	259	720
Other comprehensive (loss) income	(9,002)	1,637	(10,757)	1,179
Comprehensive (loss) income	(8,480)	2,861	(8,626)	2,717
Less: Comprehensive (loss) income attributable to noncontrolling interest	(348)	229	(356)	410
Comprehensive (loss) income attributable to Ampco-Pittsburgh	$ (8,132)	$ 2,632	$ (8,270)	$ 2,307