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SIGNIFICANT ACCOUNTING POLICIES - RECOGNITION OF REVENUES AND EXPENES (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Total | $ 406.6 | $ 392.7 | $ 785.9 | $ 762.7
Total | 150.5 | 119.8 | 282.6 | 224.2
Ocean Transportation |  |  |  |
Ocean transportation services | 401.2 | 388.2 | 775.9 | 753.2
Terminal and other related services | 0.5 | 0.8 | 1.3 | 1.6
Fuel sales | 3.1 | 2.0 | 5.2 | 4.5
Ship management services | 1.8 | 1.7 | 3.5 | 3.4
Total | 406.6 | 392.7 | $ 785.9 | $ 762.7
Percentage of ocean transportation revenues and fuel sales denominated in foreign currency |  |  | 3.00% | 3.00%
Logistics |  |  |  |
Transportation brokerage and freight forwarding services | 136.4 | 106.9 | $ 255.6 | $ 199.2
Warehouse and distribution services | 7.8 | 7.3 | 15.2 | 14.5
Supply chain management and other services | 6.3 | 5.6 | 11.8 | 10.5
Total | $ 150.5 | $ 119.8 | $ 282.6 | $ 224.2
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. + 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: |