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DESCRIPTION OF THE BUSINESS (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 3 Months Ended
Mar. 22, 2015
Mar. 31, 2015
facility
Horizon Acquisition    
Acquisition Value $ 456us-gaap_BusinessCombinationConsiderationTransferred1  
Ocean Transportation | SSAT    
DESCRIPTION OF THE BUSINESS    
Ownership interest in SSAT (as a percent)   35.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= matx_SsaTerminalsLlcMember
/ us-gaap_StatementBusinessSegmentsAxis
= matx_OceanTransportationSegmentMember
Number of terminal facilities on which SSAT provides terminal and stevedoring services to Matnav and numerous carriers   6matx_NumberOfTerminalFacilitiesOnWhichInvesteeProvidesTerminalAndStevedoringServices
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= matx_SsaTerminalsLlcMember
/ us-gaap_StatementBusinessSegmentsAxis
= matx_OceanTransportationSegmentMember