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Lease obligations - Extension options (Details) $ in Thousands | Dec. 31, 2019 USD ($)
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Disclosure of Finance Leases [Line Items] |
Lease liabilities recognized (discounted) | $ 718,505
Potential future lease payments not included in lease liabilities (undiscounted) | 70,588
Ocean going vessels |
Disclosure of Finance Leases [Line Items] |
Lease liabilities recognized (discounted) | 462,843
Potential future lease payments not included in lease liabilities (undiscounted) | 22,464
Terminal and tanks |
Disclosure of Finance Leases [Line Items] |
Lease liabilities recognized (discounted) | 194,665
Potential future lease payments not included in lease liabilities (undiscounted) | 31,210
Other |
Disclosure of Finance Leases [Line Items] |
Lease liabilities recognized (discounted) | 60,997
Potential future lease payments not included in lease liabilities (undiscounted) | $ 16,914

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- Definition [Line Items] for Disclosure of Finance Leases [Table] + References No definition available. + Details
Name: | mx_DisclosureofFinanceLeasesLineItems
Namespace Prefix: | mx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Finance Lease, Liability, Payment, Due1 + References No definition available. + Details
Name: | mx_FinanceLeaseLiabilityPaymentDue1
Namespace Prefix: | mx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lessee, Finance Lease, Option to Extend, Amount + References No definition available. + Details
Name: | mx_LesseeFinanceLeaseOptiontoExtendAmount
Namespace Prefix: | mx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | mx_TypeofLeasedPropertyAxis=mx_VesselsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | mx_TypeofLeasedPropertyAxis=mx_TerminalsandtanksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | mx_TypeofLeasedPropertyAxis=mx_OtherLeasedPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |