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Segmented information - Property, plant and equipment, net (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of geographical areas [line items] |  |
Property, plant and equipment | $ 2,998,326 | $ 3,117,469
United States |  |
Disclosure of geographical areas [line items] |  |
Property, plant and equipment | 1,412,394 | 1,468,283
Egypt |  |
Disclosure of geographical areas [line items] |  |
Property, plant and equipment | 720,397 | 742,446
New Zealand |  |
Disclosure of geographical areas [line items] |  |
Property, plant and equipment | 265,153 | 261,482
Trinidad |  |
Disclosure of geographical areas [line items] |  |
Property, plant and equipment | 155,525 | 176,256
Canada |  |
Disclosure of geographical areas [line items] |  |
Property, plant and equipment | 148,420 | 154,982
Chile |  |
Disclosure of geographical areas [line items] |  |
Property, plant and equipment | 107,495 | 108,065
Other |  |
Disclosure of geographical areas [line items] |  |
Property, plant and equipment | $ 188,942 | $ 205,955

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_a&doctype=Standard -URIDate 2017-03-09 + Details
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Balance Type: | debit
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- Details
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Namespace Prefix: |
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- Details
Name: | ifrs-full_GeographicalAreasAxis=mx_EGYPTMember
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_GeographicalAreasAxis=mx_NEWZEALANDMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_GeographicalAreasAxis=mx_TRINIDADANDTOBAGOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_GeographicalAreasAxis=mx_CANADAMember
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- Details
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Balance Type: |
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- Details
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