XML 38 R1.htm IDEA: XBRL DOCUMENT v3.8.0.1
Document and Entity Information - shares
 12 Months Ended
Dec. 31, 2017
Mar. 05, 2018
Document And Entity Information [Abstract]    
Entity Registrant Name METHANEX CORP  
Entity Central Index Key 0000886977  
Current Fiscal Year End Date --12-31  
Document Type 40-F  
Document Period End Date Dec. 31, 2017  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus FY  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   83,783,704
Entity Current Reporting Status Yes