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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Depreciation and amortization (foreign currency purchase contracts) $ (7,091) $ (4,586) $ (17,095) $ (13,954)
Costs of products sold (excluding depreciation and amortization) (futures contracts - copper and aluminum) (86,656) (76,389) (260,741) (256,563)
(Loss) income before income taxes (1,130) (818) (5,308) 845
Other income (loss) - net 748 288 1,349 2,600
Income tax effect (525) (636) (1,176) (1,953)
Net loss attributable to Ampco-Pittsburgh (2,211) (1,959) (8,404) (2,664)
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 (157) (177) (480) (534)
Income tax effect 0   0  
Net loss attributable to Ampco-Pittsburgh (244) (13) (584) (280)
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) (6) (6) (20) (20)
Costs of products sold (excluding depreciation and amortization) (futures contracts - copper and aluminum) (242) (7) (578) (267)
(Loss) income before income taxes (248) (13) (598) (287)
Income tax effect 4 0 14 7
Net loss attributable to Ampco-Pittsburgh $ (157) $ (177) $ (480) $ (534)