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Non-controlling interests - Financial position (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of subsidiaries [line items]    
Current assets $ 1,243,127 $ 1,025,667
Non-current assets 3,367,615 3,530,996
Current liabilities (747,948) (606,933)
Non-current liabilities (2,117,683) (2,144,380)
Carrying amount of Methanex non-controlling interests 244,347 208,515
Total    
Disclosure of subsidiaries [line items]    
Current assets 275,272 167,545
Non-current assets 825,731 862,516
Current liabilities (243,748) (191,710)
Non-current liabilities (369,274) (423,909)
Net assets 487,981 414,442
Carrying amount of Methanex non-controlling interests 244,347 208,515
Methanex Egypt    
Disclosure of subsidiaries [line items]    
Current assets 248,032 155,422
Non-current assets 720,356 746,202
Current liabilities (231,259) (177,088)
Non-current liabilities (293,184) (339,369)
Net assets 443,945 385,167
Carrying amount of Methanex non-controlling interests 216,599 188,099
Other    
Disclosure of subsidiaries [line items]    
Current assets 27,240 12,123
Non-current assets 105,375 116,314
Current liabilities (12,489) (14,622)
Non-current liabilities (76,090) (84,540)
Net assets 44,036 29,275
Carrying amount of Methanex non-controlling interests $ 27,748 $ 20,416