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DEBT (Details 2) (USD $) | 12 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2012 | Jun. 30, 2012 | Jan. 31, 2014 | May 31, 2005 | Dec. 31, 2012 | Aug. 31, 2011 | Sep. 30, 2003 | Aug. 31, 2004
Debt |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding | $ 6,000,000 us-gaap_LineOfCreditFacilityAmountOutstanding |  |  |  |  |  |  |  |  |
Extinguishment of debt | 63,800,000 us-gaap_ExtinguishmentOfDebtAmount | 68,200,000 us-gaap_ExtinguishmentOfDebtAmount |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding |  |  |  |  |  |  | 24,000,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |
Debt instrument term |  |  |  | 5 years |  |  |  |  |  |
Maximum borrowing capacity |  |  | 375,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | 375,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  |  |
Uncommitted option to increase credit facility |  |  | 75,000,000 matx_LineOfCreditFacilityOptionToIncrease / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | 75,000,000 matx_LineOfCreditFacilityOptionToIncrease / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  |  |
Extinguishment of debt |  |  | 72,000,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  |  |  |
Used portion of credit facility | 6,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | 5,800,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  |  |  |  |
Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Ratio of consolidated EBITDA to interest expense | 0.0350 matx_LineOfCreditFacilityConsolidatedInterestCoverageRatioCompliance / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  |  |
Credit facility commitment fee percentage | 0.15%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Variable rate margin | 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Minimum | Base rate |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Variable rate margin | 0.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt covenant, required ratio of debt to consolidated EBITDA | 0.0325 matx_LineOfCreditFacilityRatioOfDebtToConsolidatedEbitdaCompliance / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |  |
Debt covenant, required principal amount of priority debt as a percentage of consolidated tangible assets | 20.00%matx_LineOfCreditFacilityDebtAsPercentageOfAssetsCompliance / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |  |
Debt covenant, required principal amount of priority debt (excluding Title XI) as a percentage of consolidated tangible assets | 10.00%matx_LineOfCreditFacilityCovenantPrincipalAmountOfOtherPriorityDebtAsPercentageOfConsolidatedTangibleAssets / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |  |
Credit facility commitment fee percentage | 0.40%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Variable rate margin | 2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Maximum | Base rate |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Variable rate margin | 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Alexander & Baldwin |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | 125,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / dei_LegalEntityAxis = matx_AlexanderAndBaldwinIncMember |  |
Standby and commercial letters of credit |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | 100 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = matx_StandbyAndCommercialLettersOfCreditMember | 100 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = matx_StandbyAndCommercialLettersOfCreditMember |  |  |  |  |  |
Standby and commercial letters of credit | Minimum |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Line of credit fees percentage | 1.00%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = matx_StandbyAndCommercialLettersOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  |  |
Standby and commercial letters of credit | Maximum |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Line of credit fees percentage | 2.25%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = matx_StandbyAndCommercialLettersOfCreditMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |  |
Swing Line Loans [Member] |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | 50,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = matx_SwingLineLoansMember | 50,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = matx_SwingLineLoansMember |  |  |  |  |  |
Secured Bonds Payable5.34 Percent Through2028 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  |  | 55,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = matx_SecuredBondsPayable5.34PercentThrough2028Member |
Interest rate (as a percent) | 5.34%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = matx_SecuredBondsPayable5.34PercentThrough2028Member | 5.34%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = matx_SecuredBondsPayable5.34PercentThrough2028Member |  |  |  |  |  |  | 5.34%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = matx_SecuredBondsPayable5.34PercentThrough2028Member |
Number of semi-annual payments | 50 matx_DebtInstrumentNumberOfPeriodicPayment / us-gaap_LongtermDebtTypeAxis = matx_SecuredBondsPayable5.34PercentThrough2028Member |  |  |  |  |  |  |  |  |
Semi-annual payments | 1,100,000 us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_LongtermDebtTypeAxis = matx_SecuredBondsPayable5.34PercentThrough2028Member |  |  |  |  |  |  |  |  |
Secured Bonds Payable5.27 Percent Through2029 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  |  |  | 55,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = matx_SecuredBondsPayable5.27PercentThrough2029Member
Interest rate (as a percent) | 5.27%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = matx_SecuredBondsPayable5.27PercentThrough2029Member | 5.27%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = matx_SecuredBondsPayable5.27PercentThrough2029Member |  |  |  |  |  |  |  | 5.27%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = matx_SecuredBondsPayable5.27PercentThrough2029Member
Number of semi-annual payments | 50 matx_DebtInstrumentNumberOfPeriodicPayment / us-gaap_LongtermDebtTypeAxis = matx_SecuredBondsPayable5.27PercentThrough2029Member |  |  |  |  |  |  |  |  |
Semi-annual payments | 1,100,000 us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_LongtermDebtTypeAxis = matx_SecuredBondsPayable5.27PercentThrough2029Member |  |  |  |  |  |  |  |  |
Senior Unsecured Long Term Debt |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  | 100,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = matx_SeniorUnsecuredLongTermDebtMember |  |  |  |  |
Debt instrument term |  |  |  |  | 30 years |  |  |  |  |
Weighted average period | 14 years 6 months |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 4.35%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = matx_SeniorUnsecuredLongTermDebtMember |  |  |  |  |
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2021 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Annual principal payments |  |  |  |  | 5,000,000 us-gaap_DebtInstrumentAnnualPrincipalPayment / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodOneMember / us-gaap_LongtermDebtTypeAxis = matx_SeniorUnsecuredLongTermDebtMember |  |  |  |  |
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2022 and 2023 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Annual principal payments |  |  |  |  | 7,500,000 us-gaap_DebtInstrumentAnnualPrincipalPayment / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodTwoMember / us-gaap_LongtermDebtTypeAxis = matx_SeniorUnsecuredLongTermDebtMember |  |  |  |  |
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2024 to 2027 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Annual principal payments |  |  |  |  | 10,000,000 us-gaap_DebtInstrumentAnnualPrincipalPayment / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodThreeMember / us-gaap_LongtermDebtTypeAxis = matx_SeniorUnsecuredLongTermDebtMember |  |  |  |  |
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2028 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Annual principal payments |  |  |  |  | 8,000,000 us-gaap_DebtInstrumentAnnualPrincipalPayment / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodFourMember / us-gaap_LongtermDebtTypeAxis = matx_SeniorUnsecuredLongTermDebtMember |  |  |  |  |
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2029 and thereafter until 2044 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Annual principal payments |  |  |  |  | 2,000,000 us-gaap_DebtInstrumentAnnualPrincipalPayment / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodFiveMember / us-gaap_LongtermDebtTypeAxis = matx_SeniorUnsecuredLongTermDebtMember |  |  |  |  |
Unsecured debt |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  | 170,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 170,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  |  |  |
Weighted average coupon rate (as a percent) |  |  | 3.97%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 3.97%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  |  |  |
Weighted average period |  |  |  | 9 years 2 months 12 days |  |  |  |  |  |
Number of tranches |  |  | 3 matx_UnsecuredLongTermDebtNumberOfTranches / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 3 matx_UnsecuredLongTermDebtNumberOfTranches / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  |  |  |
Unsecured debt | 2015 through 2016 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Semi-annual payments |  |  |  | 4,600,000 us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_DebtInstrumentRedemptionPeriodAxis = matx_DebtInstrumentRedemptionPeriodSixMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  |  |  |
Unsecured debt | 2017 through mid-year 2023 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Semi-annual payments |  |  |  | 8,400,000 us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_DebtInstrumentRedemptionPeriodAxis = matx_DebtInstrumentRedemptionPeriodSevenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  |  |  |
Unsecured debt | Mid-year 2023 through mid-year 2027 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Semi-annual payments |  |  |  | 3,800,000 us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_DebtInstrumentRedemptionPeriodAxis = matx_DebtInstrumentRedemptionPeriodEightMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  |  |  |
Unsecured debt | After mid-year 2027 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Semi-annual payments |  |  |  | 1,200,000 us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_DebtInstrumentRedemptionPeriodAxis = matx_DebtInstrumentRedemptionPeriodNineMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  |  |  |
Unsecured debt, tranche maturing in 2023 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  | 77,500,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = matx_UnsecuredDebtTrancheMaturing2023Member | 77,500,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = matx_UnsecuredDebtTrancheMaturing2023Member |  |  |  |  |  |
Interest rate (as a percent) |  |  | 3.66%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = matx_UnsecuredDebtTrancheMaturing2023Member | 3.66%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = matx_UnsecuredDebtTrancheMaturing2023Member |  |  |  |  |  |
Unsecured debt, tranche maturing in 2027 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  | 55,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = matx_UnsecuredDebtTrancheMaturing2027Member | 55,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = matx_UnsecuredDebtTrancheMaturing2027Member |  |  |  |  |  |
Interest rate (as a percent) |  |  | 4.16%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = matx_UnsecuredDebtTrancheMaturing2027Member | 4.16%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = matx_UnsecuredDebtTrancheMaturing2027Member |  |  |  |  |  |
Unsecured debt, tranche maturing in 2032 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  | 37,500,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = matx_UnsecuredDebtTrancheMaturing2032Member | 37,500,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = matx_UnsecuredDebtTrancheMaturing2032Member |  |  |  |  |  |
Interest rate (as a percent) |  |  | 4.31%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = matx_UnsecuredDebtTrancheMaturing2032Member | 4.31%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = matx_UnsecuredDebtTrancheMaturing2032Member |  |  |  |  |  |
Notes Payable4.79 Series B [Member] |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  | 105,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = matx_NotesPayable4.79SeriesBMember |  |  |  |
Debt instrument term |  |  |  |  |  | 15 years |  |  |  |
Interest rate (as a percent) |  |  | 5.79%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = matx_NotesPayable4.79SeriesBMember | 5.79%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = matx_NotesPayable4.79SeriesBMember |  | 4.79%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = matx_NotesPayable4.79SeriesBMember |  |  |  |
Annual principal payments |  |  |  |  |  | 3,500,000 us-gaap_DebtInstrumentAnnualPrincipalPayment / us-gaap_LongtermDebtTypeAxis = matx_NotesPayable4.79SeriesBMember |  |  |  |
Release of MV Manulani as security for debt |  |  | $ (56,000,000)us-gaap_DebtInstrumentCollateralAmount / us-gaap_LongtermDebtTypeAxis = matx_NotesPayable4.79SeriesBMember | $ (56,000,000)us-gaap_DebtInstrumentCollateralAmount / us-gaap_LongtermDebtTypeAxis = matx_NotesPayable4.79SeriesBMember |  |  |  |  |  |

X
- Definition Represents the number of periodic payments of the debt instrument. + References No definition available. + Details
Name: | matx_DebtInstrumentNumberOfPeriodicPayment
Namespace Prefix: | matx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the actual consolidated interest coverage ration used to determine compliance with the financial covenant of the line of credit facility. + References No definition available. + Details
Name: | matx_LineOfCreditFacilityConsolidatedInterestCoverageRatioCompliance
Namespace Prefix: | matx_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the principal amount of other debt, which is not Title XI priority debt as a percentage of consolidated tangible assets. + References No definition available. + Details
Name: | matx_LineOfCreditFacilityCovenantPrincipalAmountOfOtherPriorityDebtAsPercentageOfConsolidatedTangibleAssets
Namespace Prefix: | matx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the actual amount of principal amount of priority debt as a percentage of consolidated tangible assets used to determine compliance with the financial covenant of the line of credit facility. + References No definition available. + Details
Name: | matx_LineOfCreditFacilityDebtAsPercentageOfAssetsCompliance
Namespace Prefix: | matx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the option to increase the revolving credit facility. + References No definition available. + Details
Name: | matx_LineOfCreditFacilityOptionToIncrease
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the actual ratio used to determine compliance with the ratio of debt to consolidated EBITDA financial covenant of the line of credit facility. + References No definition available. + Details
Name: | matx_LineOfCreditFacilityRatioOfDebtToConsolidatedEbitdaCompliance
Namespace Prefix: | matx_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the weighted average period of the tranches of unsecured long-term debt in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | matx_LongtermDebtWeightedAveragePeriod
Namespace Prefix: | matx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of tranches in which the unsecured long-term debt funded. + References No definition available. + Details
Name: | matx_UnsecuredLongTermDebtNumberOfTranches
Namespace Prefix: | matx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of the total principal payments made during the annual reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
Name: | us-gaap_DebtInstrumentAnnualPrincipalPayment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of assets pledged to secure a debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of the required periodic payments applied to principal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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