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INVESTMENT IN TERMINAL JOINT VENTURE (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Investments in affiliates |  |  |
Investment in terminal joint venture | $ 64.4 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures | $ 57.6 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |
Financial information for equity method investment |  |  |
Company Share of Net Income (Loss) | 6.6 us-gaap_IncomeLossFromEquityMethodInvestments | (2.0)us-gaap_IncomeLossFromEquityMethodInvestments | 3.2 us-gaap_IncomeLossFromEquityMethodInvestments
SSAT | Ocean Transportation |  |  |
Investments in affiliates |  |  |
Ownership interest accounted in terminal joint venture (as a percent) | 35.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember |  |
Cost of services from transactions with unconsolidated affiliate | 164.8 us-gaap_CostsAndExpensesRelatedParty / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 164.3 us-gaap_CostsAndExpensesRelatedParty / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 163.8 us-gaap_CostsAndExpensesRelatedParty / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember
Dividends and distributions from the unconsolidated terminal venture | 0 us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 0 us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 0 us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember
Accounts payable and accrued liabilities | 17.5 matx_EquityMethodInvestmentSummarizedFinancialInformationAccountsPayableAndAccruedLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 15.3 matx_EquityMethodInvestmentSummarizedFinancialInformationAccountsPayableAndAccruedLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember |
Financial information for equity method investment |  |  |
Current assets | 80.7 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 73.5 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember |
Noncurrent assets | 140.9 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 137.1 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember |
Total assets | 221.6 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 210.6 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember |
Current liabilities | 40.9 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 43.2 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember |
Noncurrent liabilities | 7.1 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 15.7 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember |
Equity | 173.6 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 151.7 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember |
Total Liabilities and Equity | 221.6 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 210.6 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember |
Operating revenue | 586.2 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 498.4 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 503.9 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember
Operating costs and expenses | 589.7 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCostOfSales / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 517.4 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCostOfSales / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 506.4 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCostOfSales / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember
Operating loss | (3.5)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | (19.0)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | (2.5)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember
Net Income (Loss) | 21.2 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | (5.7)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 9.5 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember
Company Share of Net Income (Loss) | $ 6.6 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | $ (2.0)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | $ 3.2 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember

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