Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 985	$ (87)
Adjustments for changes in:
Foreign currency translation	1,912	(2,614)
Unrecognized employee benefit costs (including effects of foreign currency translation)	(149)	146
Fair value of cash flow hedges	178	443
Reclassification adjustments for items included in net income (loss):
Amortization of unrecognized employee benefit costs	(195)	365
Settlements of cash flow hedges	(114)	(95)
Other comprehensive income (loss)	1,632	(1,755)
Comprehensive income (loss)	2,617	(1,842)
Less: Comprehensive income (loss) attributable to noncontrolling interest	348	(8)
Comprehensive income (loss) attributable to Ampco-Pittsburgh	$ 2,269	$ (1,834)