XML 107 R84.htm IDEA: XBRL DOCUMENT
v3.19.1

Segmented information - Property, plant and equipment, net (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of geographical areas [line items] |  |
Property, plant and equipment | $ 3,025,095 | $ 2,998,326
United States |  |
Disclosure of geographical areas [line items] |  |
Property, plant and equipment | 1,407,693 | 1,412,394
Egypt |  |
Disclosure of geographical areas [line items] |  |
Property, plant and equipment | 680,730 | 720,397
New Zealand |  |
Disclosure of geographical areas [line items] |  |
Property, plant and equipment | 314,281 | 265,153
Trinidad |  |
Disclosure of geographical areas [line items] |  |
Property, plant and equipment | 142,045 | 155,525
Canada |  |
Disclosure of geographical areas [line items] |  |
Property, plant and equipment | 126,488 | 148,420
Chile |  |
Disclosure of geographical areas [line items] |  |
Property, plant and equipment | 132,494 | 107,495
Other |  |
Disclosure of geographical areas [line items] |  |
Property, plant and equipment | $ 221,364 | $ 188,942

X
- 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
Name: | ifrs-full_DisclosureOfGeographicalAreasLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | ifrs-full_PropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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

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

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

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

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