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Related parties - Subsidiaries and joint ventures (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Methanex Asia Pacific Limited |  |
Disclosure of subsidiaries [line items] |  |
Interest % | 100.00% | 100.00%
Methanex Europe NV |  |
Disclosure of subsidiaries [line items] |  |
Interest % | 100.00% | 100.00%
Methanex Methanol Company, LLC |  |
Disclosure of subsidiaries [line items] |  |
Interest % | 100.00% | 100.00%
Egyptian Methanex Methanol Company S.A.E. (Methanex Egypt) |  |
Disclosure of subsidiaries [line items] |  |
Interest % | 50.00% | 50.00%
Methanex Chile S.A. |  |
Disclosure of subsidiaries [line items] |  |
Interest % | 100.00% | 100.00%
Methanex New Zealand Limited |  |
Disclosure of subsidiaries [line items] |  |
Interest % | 100.00% | 100.00%
Methanex Trinidad (Titan) Unlimited |  |
Disclosure of subsidiaries [line items] |  |
Interest % | 100.00% | 100.00%
Methanex U.S.A. LLC |  |
Disclosure of subsidiaries [line items] |  |
Interest % | 100.00% | 100.00%
Methanex Louisiana LLC |  |
Disclosure of subsidiaries [line items] |  |
Interest % | 100.00% | 100.00%
Waterfront Shipping Company Limited |  |
Disclosure of subsidiaries [line items] |  |
Interest % | 100.00% | 100.00%
Atlas Methanol Company Unlimited |  |
Disclosure of associates [line items] |  |
Interest % | 63.10% | 63.10%

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