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SIGNIFICANT ACCOUNTING POLICIES - RECOGNITION OF REVENUES AND EXPENSES (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Total | $ 437.3 | $ 419.2 | $ 1,223.2 | $ 1,181.9
Total | 152.1 | 124.7 | 434.7 | 348.9
Ocean Transportation |  |  |  |
Ocean Transportation services | 431.4 | 414.1 | 1,207.3 | 1,167.3
Terminal and other related services | 0.7 | 0.6 | 2.0 | 2.2
Fuel sales | 3.5 | 2.8 | 8.7 | 7.3
Ship management services and related costs | 1.7 | 1.7 | 5.2 | 5.1
Total | 437.3 | 419.2 | $ 1,223.2 | $ 1,181.9
Percentage of ocean transportation revenues and fuel sales denominated in foreign currency |  |  | 3.00% | 3.00%
Logistics |  |  |  |
Transportation Brokerage and Freight Forwarding Services | 135.4 | 110.1 | $ 391.0 | $ 309.3
Warehouse and distribution services | 8.9 | 7.8 | 24.1 | 22.3
Supply chain management and other services | 7.8 | 6.8 | 19.6 | 17.3
Total | $ 152.1 | $ 124.7 | $ 434.7 | $ 348.9
Percentage of transportation brokerage and freight forwarding services revenue denominated in forgeign currency |  |  | 3.00% | 3.00%

X
- Definition Amount of fuel sales revenue. + References No definition available. + Details
Name: | matx_FuelSalesRevenue
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents revenue from rail intermodal, highway brokerage and warehousing. + References No definition available. + Details
Name: | matx_LogisticsServices
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents revenue earned primarily through the carriage of containerized freight between various US Pacific Coast, Hawaii, Guam, Micronesia, China and other Pacific island ports. + References No definition available. + Details
Name: | matx_OceanTransportation
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of ocean transportation services revenue. + References No definition available. + Details
Name: | matx_OceanTransportationServicesRevenue
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of ocean transportation revenues and fuel sales denominated in foreign currency. + References No definition available. + Details
Name: | matx_PercentageOfOceanTransportationAndFuelSalesRevenuesDenominatedInForeignCurrency
Namespace Prefix: | matx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of transportation brokerage and freight forwarding services revenue denominated in forgeign currency. + References No definition available. + Details
Name: | matx_PercentageOfTransportationBrokerageAndFreightServicesRevenueDenominatedinforeigncurrency
Namespace Prefix: | matx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of ship management services revenue and related costs. + References No definition available. + Details
Name: | matx_ShipManagementServicesRevenue
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of supply chain management and other services revenue. + References No definition available. + Details
Name: | matx_SupplyChaingManagementAndOtherServicesRevenue
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of terminal and other related services revenue. + References No definition available. + Details
Name: | matx_TerminalAndOtherRelatedServicesRevenue
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of transportation brokerage and freight forwarding services revenue. + References No definition available. + Details
Name: | matx_TransportationBrokerageAndFreightForwardingServicesRevenue
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of warehouse and distribution services revenue. + References No definition available. + Details
Name: | matx_WarehouseAndDistributionServicesRevenue
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=matx_OceanTransportationSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=matx_LogisticsServicesSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |