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v3.19.1

LEASES - LEASE TYPE (Details) | 3 Months Ended
--- | ---
Mar. 31, 2019
Real estate and terminal leases |
Lessee, Lease, Description [Line Items] |
Base term | 65 years
Vessel charter leases |
Lessee, Lease, Description [Line Items] |
Base term | 10 years
Operations equipment and other leases |
Lessee, Lease, Description [Line Items] |
Base term | 8 years

X
- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | matx_LesseeOperatingLeaseTermOfContract
Namespace Prefix: | matx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=matx_OperatingLeaseOnRealEstateAndTerminalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=matx_OperatingLeaseOnVesselCharterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=matx_OperatingLeaseOnOperationsEquipmentAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |