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Accumulated Other Comprehensive Loss - Net Change and Ending Balances for Various Components of 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
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ 77,670 $ 67,239 $ 71,091 $ 71,571
Net change 5,375 (595) 9,757 (3,067)
Ending Balance 76,495 69,459 76,495 69,459
Foreign Currency Translation [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (27,691) (23,161)
Net change     10,702 (2,722)
Ending Balance (16,989) (25,883) (16,989) (25,883)
Unrecognized Employee Benefit Costs [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (39,856) (40,490)
Net change     (1,403) (288)
Ending Balance (41,259) (40,778) (41,259) (40,778)
Cash Flow Hedges [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (102) 186
Net change     458 (57)
Ending Balance 356 129 356 129
Less: Noncontrolling Interest [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (813) (476)
Net change     240 (273)
Ending Balance (573) (749) (573) (749)
Accumulated Other Comprehensive Loss Attributable to Ampco-Pittsburgh [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (66,836) (62,989)
Net change     9,517 (2,794)
Ending Balance (57,319) (65,783) (57,319) (65,783)
Total Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (67,649) (63,465)
Net change     9,757 (3,067)
Ending Balance $ (57,892) $ (66,532) $ (57,892) $ (66,532)