XML 9 R1.htm IDEA: XBRL DOCUMENT v3.25.3
Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2025
Nov. 07, 2025
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2025  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q3  
Trading Symbol AP  
Entity Registrant Name AMPCO-PITTSBURGH CORP  
Entity Central Index Key 0000006176  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   20,326,389
Entity File Number 1-898  
Entity Tax Identification Number 25-1117717  
Entity Address, Address Line One 726 Bell Avenue  
Entity Address, Address Line Two Suite 301  
Entity Address, City or Town Carnegie  
Entity Address, State or Province PA  
Entity Address, Postal Zip Code 15106  
City Area Code 412  
Local Phone Number 456-4400  
Entity Interactive Data Current Yes  
Title of 12(b) Security Common Stock, $1 par value  
Security Exchange Name NYSE  
Entity Incorporation, State or Country Code PA  
Document Quarterly Report true  
Document Transition Report false