v3.26.1
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
Mar. 31, 2026
Mar. 31, 2025
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Depreciation and amortization (foreign currency purchase contracts) $ (4,258) $ (4,636)
Costs of products sold (excluding depreciation and amortization) (futures contracts - copper and aluminum) (86,755) (82,104)
Income before income taxes 435 1,950
Other loss - net 596 826
Income tax effect (585) (59)
Net (loss) income attributable to Ampco-Pittsburgh (867) 1,142
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 loss - net (67) (65)
Net (loss) income attributable to Ampco-Pittsburgh (68) (59)
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)
Costs of products sold (excluding depreciation and amortization) (futures contracts - copper and aluminum) (64) (55)
Income before income taxes (70) (61)
Income tax effect 2 2
Net (loss) income attributable to Ampco-Pittsburgh $ (67) $ (65)