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Accumulated Other Comprehensive Loss - Line Items Affected on Consolidated Statements of Operations for Components Reclassified from Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Depreciation and amortization (foreign currency purchase contracts) $ (5,368) $ (4,698) $ (10,004) $ (9,368)
Costs of products sold (excluding depreciation and amortization) (futures contracts - copper and aluminum) (91,981) (87,684) (174,085) (180,174)
(Loss) income before income taxes (6,128) 3,415 (4,178) 1,663
Other income (loss) - net (225) 1,389 601 2,312
Income tax effect (592) (863) (651) (1,317)
Net (loss) income attributable to Ampco-Pittsburgh (7,335) 2,012 (6,193) (705)
Amortization of Unrecognized Employee Benefit Costs [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Other income (loss) - net (258) (174) (323) (357)
Income tax effect 0   0  
Net (loss) income attributable to Ampco-Pittsburgh (258) (174) (323) (357)
Settlements of Cash Flow Hedges [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Depreciation and amortization (foreign currency purchase contracts) (8) (8) (14) (14)
Costs of products sold (excluding depreciation and amortization) (futures contracts - copper and aluminum) (281) (278) (336) (260)
(Loss) income before income taxes (289) (286) (350) (274)
Income tax effect 8 8 10 7
Net (loss) income attributable to Ampco-Pittsburgh $ (281) $ (278) $ (340) $ (267)