Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 996	$ 2,926	$ 1,981	$ 2,839
Adjustments for changes in:
Foreign currency translation	(875)	(8,428)	1,037	(11,042)
Unrecognized employee benefit costs (including effects of foreign currency translation)	13	404	(136)	550
Fair value of cash flow hedges	(278)	(1,001)	(100)	(558)
Reclassification adjustments for items included in net income:
Amortization of unrecognized employee benefit costs	(298)	187	(493)	552
Settlements of cash flow hedges	(73)	(164)	(187)	(259)
Other comprehensive (loss) income	(1,511)	(9,002)	121	(10,757)
Comprehensive (loss) income	(515)	(6,076)	2,102	(7,918)
Less: Comprehensive income (loss) attributable to noncontrolling interest	56	(348)	404	(356)
Comprehensive (loss) income attributable to Ampco-Pittsburgh	$ (571)	$ (5,728)	$ 1,698	$ (7,562)