v3.26.3
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, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Depreciation and amortization (foreign currency purchase contracts) $ (4,130) $ (7,091) $ (12,614) $ (17,095)
Costs of products sold (excluding depreciation and amortization) (futures contracts - copper and aluminum) (89,326) (86,656) (256,756) (260,741)
Income (loss) before income taxes 1,480 (1,130) 4,741 (5,308)
Other loss - net (370) 748 771 1,349
Income tax effect (346) (525) (1,608) (1,176)
Net income (loss) attributable to Ampco-Pittsburgh 458 (2,211) 1,080 (8,404)
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 (115) (157) (346) (480)
Net income (loss) attributable to Ampco-Pittsburgh (71) (244) (240) (584)
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) (7) (6) (20) (20)
Costs of products sold (excluding depreciation and amortization) (futures contracts - copper and aluminum) (66) (242) (229) (578)
Income (loss) before income taxes (73) (248) (249) (598)
Income tax effect 2 4 9 14
Net income (loss) attributable to Ampco-Pittsburgh $ (115) $ (157) $ (346) $ (480)