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REPORTABLE SEGMENTS (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 segment | Dec. 31, 2013 | Dec. 31, 2012
Segment results |  |  |  |  |  |  |  |  |  |  |
Number of segments |  |  |  |  |  |  |  |  | 2 us-gaap_NumberOfReportableSegments |  |
Revenue | $ 443.5 us-gaap_SalesRevenueNet | $ 441.8 us-gaap_SalesRevenueNet | $ 436.4 us-gaap_SalesRevenueNet | $ 392.5 us-gaap_SalesRevenueNet | $ 410.9 us-gaap_SalesRevenueNet | $ 415.0 us-gaap_SalesRevenueNet | $ 416.6 us-gaap_SalesRevenueNet | $ 394.7 us-gaap_SalesRevenueNet | $ 1,714.2 us-gaap_SalesRevenueNet | $ 1,637.2 us-gaap_SalesRevenueNet | $ 1,560.0 us-gaap_SalesRevenueNet
Operating income | 49.4 us-gaap_OperatingIncomeLoss | 45.0 us-gaap_OperatingIncomeLoss | 35.7 us-gaap_OperatingIncomeLoss | 9.9 us-gaap_OperatingIncomeLoss | 17.9 us-gaap_OperatingIncomeLoss | 27.2 us-gaap_OperatingIncomeLoss | 36.5 us-gaap_OperatingIncomeLoss | 18.7 us-gaap_OperatingIncomeLoss | 140.0 us-gaap_OperatingIncomeLoss | 100.3 us-gaap_OperatingIncomeLoss | 96.7 us-gaap_OperatingIncomeLoss
Interest expense, net | (4.3)us-gaap_InterestExpense | (4.4)us-gaap_InterestExpense | (4.5)us-gaap_InterestExpense | (4.1)us-gaap_InterestExpense | (3.5)us-gaap_InterestExpense | (3.6)us-gaap_InterestExpense | (3.6)us-gaap_InterestExpense | (3.7)us-gaap_InterestExpense | (17.3)us-gaap_InterestExpense | (14.4)us-gaap_InterestExpense | (11.7)us-gaap_InterestExpense
Income before income taxes | 45.1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 40.6 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 31.2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 5.8 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 14.4 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 23.6 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 32.9 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 15.0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 122.7 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 85.9 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 85.0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income taxes | (17.3)us-gaap_IncomeTaxExpenseBenefit | (19.1)us-gaap_IncomeTaxExpenseBenefit | (13.1)us-gaap_IncomeTaxExpenseBenefit | (2.4)us-gaap_IncomeTaxExpenseBenefit | (7.1)us-gaap_IncomeTaxExpenseBenefit | (6.4)us-gaap_IncomeTaxExpenseBenefit | (12.8)us-gaap_IncomeTaxExpenseBenefit | (5.9)us-gaap_IncomeTaxExpenseBenefit | (51.9)us-gaap_IncomeTaxExpenseBenefit | (32.2)us-gaap_IncomeTaxExpenseBenefit | (33.0)us-gaap_IncomeTaxExpenseBenefit
Income (Loss) from Continuing Operations Attributable to Parent, Total |  |  |  |  |  |  |  |  | 70.8 us-gaap_IncomeLossFromContinuingOperations | 53.7 us-gaap_IncomeLossFromContinuingOperations | 52.0 us-gaap_IncomeLossFromContinuingOperations
Loss from discontinued operations |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (6.1)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net Income | 27.8 us-gaap_NetIncomeLoss | 21.5 us-gaap_NetIncomeLoss | 18.1 us-gaap_NetIncomeLoss | 3.4 us-gaap_NetIncomeLoss | 7.3 us-gaap_NetIncomeLoss | 17.2 us-gaap_NetIncomeLoss | 20.1 us-gaap_NetIncomeLoss | 9.1 us-gaap_NetIncomeLoss | 70.8 us-gaap_NetIncomeLoss | 53.7 us-gaap_NetIncomeLoss | 45.9 us-gaap_NetIncomeLoss
Assets | 1,401.8 us-gaap_Assets |  |  |  | 1,248.3 us-gaap_Assets |  |  |  | 1,401.8 us-gaap_Assets | 1,248.3 us-gaap_Assets | 1,174.3 us-gaap_Assets
Capital expenditures |  |  |  |  |  |  |  |  | 27.9 us-gaap_PaymentsToAcquireProductiveAssets | 35.2 us-gaap_PaymentsToAcquireProductiveAssets | 38.1 us-gaap_PaymentsToAcquireProductiveAssets
Depreciation and amortization |  |  |  |  |  |  |  |  | 69.7 us-gaap_DepreciationDepletionAndAmortization | 69.7 us-gaap_DepreciationDepletionAndAmortization | 72.5 us-gaap_DepreciationDepletionAndAmortization
Ocean Transportation |  |  |  |  |  |  |  |  |  |  |
Segment results |  |  |  |  |  |  |  |  |  |  |
Revenue | 333.2 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 329.5 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 321.1 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 294.6 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 309.4 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 310.1 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 310.0 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 299.9 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 1,278.4 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 1,229.4 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 1,189.8 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember
Operating income | 46.3 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 42.6 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 32.8 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 9.4 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 16.0 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 25.5 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 34.3 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 18.5 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 131.1 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 94.3 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 96.6 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember
Assets | 1,313.9 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember |  |  |  | 1,168.6 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember |  |  |  | 1,313.9 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 1,168.6 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 1,097.2 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember
Capital expenditures |  |  |  |  |  |  |  |  | 27.8 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 33.8 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 37.0 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember
Depreciation and amortization |  |  |  |  |  |  |  |  | 66.6 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 66.4 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 69.1 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember
Ocean Transportation | SSAT |  |  |  |  |  |  |  |  |  |  |
Segment results |  |  |  |  |  |  |  |  |  |  |
Equity in earnings from affiliates | 6.6 us-gaap_InvestmentsInAndAdvancesToAffiliatesAmountOfEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember |  |  |  | (2.0)us-gaap_InvestmentsInAndAdvancesToAffiliatesAmountOfEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember |  |  |  | 6.6 us-gaap_InvestmentsInAndAdvancesToAffiliatesAmountOfEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | (2.0)us-gaap_InvestmentsInAndAdvancesToAffiliatesAmountOfEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 3.2 us-gaap_InvestmentsInAndAdvancesToAffiliatesAmountOfEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember
Equity method investments | 64.4 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember |  |  |  | 57.6 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember |  |  |  | 64.4 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 57.6 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 59.6 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember
Logistics |  |  |  |  |  |  |  |  |  |  |
Segment results |  |  |  |  |  |  |  |  |  |  |
Revenue | 110.3 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 112.3 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 115.3 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 97.9 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 101.5 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 104.9 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 106.6 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 94.8 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 435.8 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 407.8 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 370.2 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember
Operating income | 3.1 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 2.4 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 2.9 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 0.5 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 1.9 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 1.7 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 2.2 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 0.2 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 8.9 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 6.0 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 0.1 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember
Assets | 87.9 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember |  |  |  | 79.7 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember |  |  |  | 87.9 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 79.7 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 77.1 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember
Capital expenditures |  |  |  |  |  |  |  |  | 0.1 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 1.4 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 1.1 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 3.1 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | $ 3.3 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | $ 3.4 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember

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