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COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Feb. 20, 2015 city | Dec. 31, 2014 employee | Oct. 21, 2014 item | Apr. 30, 2014 item | Dec. 31, 2013
Commitments, Guarantees and Contingencies |  |  |  |  |
Commitments and financial arrangements |  | $ 6.0 us-gaap_LineOfCreditFacilityAmountOutstanding |  |  |
Commitments and financial arrangements |  | 20.6 us-gaap_LossContingencyAccrualCarryingValueCurrent |  |  |
Multiemployer Plan Withdrawal Obligation recorded |  | 0 us-gaap_MultiemployerPlansWithdrawalObligation |  |  | 0 us-gaap_MultiemployerPlansWithdrawalObligation
Number of employees |  | 1,056 matx_NumberOfEmployee |  |  |
Number of employee part of collective bargaining agreements |  | 285 matx_NumberOfEmployeePartOfCollectiveBargainingAgreements |  |  |
Number of employee part of expired collective bargaining agreements |  | 252 matx_NumberOfEmployeePartOfCollectiveBargainingAgreementsExpired |  |  |
Environmental Matters |  |  |  |  |
Number of subpoenas received from the Hawaii Attorney General |  |  |  | 2 matx_NumberOfSubpoenasReceived |
Number of misdemeanor charges of violations of refuse act |  |  | 2 matx_NumberOfMisdemeanorChargesOfViolationsOfRefuseAct |  |
Number of counts of violating the refuse act accepted |  |  | 2 matx_NumberOfCountsOfViolatingRefuseActAccepted |  |
Penalty payment |  |  | 1.0 matx_PenaltyPayment |  |
Penalty payment in the form of a fine |  |  | 0.4 matx_PenaltyPaymentFine |  |
Penalty payment in the form of a community service payment |  |  | 0.6 matx_PenaltyPaymentCommunityServicePayments |  |
Accrued and other liabilities |  | 1.0 us-gaap_OtherLiabilities |  |  |
Subsequent event |  |  |  |  |
Commitments, Guarantees and Contingencies |  |  |  |  |
Term Of Contract | 5 years |  |  |  |
Number of cities | 29 matx_NumberOfCities / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |
Standby letters of credit |  |  |  |  |
Commitments, Guarantees and Contingencies |  |  |  |  |
Commitments and financial arrangements |  | 1.2 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_StandbyLettersOfCreditMember |  |  |
Benefit plan withdrawal obligations |  |  |  |  |
Commitments, Guarantees and Contingencies |  |  |  |  |
Multiemployer Plan Withdrawal Obligation recorded |  | 94.8 us-gaap_MultiemployerPlansWithdrawalObligation / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_WithdrawalFromMultiemployerDefinedBenefitPlanMember |  |  |
Self-insured workers' compensation and other insurance |  |  |  |  |
Commitments, Guarantees and Contingencies |  |  |  |  |
Commitments and financial arrangements |  | 4.8 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_UninsuredRiskMember |  |  |
U.S. Custom bonds |  |  |  |  |
Commitments, Guarantees and Contingencies |  |  |  |  |
Commitments and financial arrangements |  | 19.2 us-gaap_LossContingencyAccrualCarryingValueCurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_SuretyBondMember |  |  |
Transportation and other bonds |  |  |  |  |
Commitments, Guarantees and Contingencies |  |  |  |  |
Commitments and financial arrangements |  | $ 1.4 us-gaap_LossContingencyAccrualCarryingValueCurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = matx_SuretyBond1Member |  |  |

X
- Definition Represents the number of cities effected by contract agreement. + References No definition available. + Details
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- Definition Represents the number of misdemeanor counts of violations of Section 407 of the Rivers and Harbors Act of 1899, "Refuse Act", accepted by the entity. + References No definition available. + Details
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- Definition Represents the number of employee of the entity. + References No definition available. + Details
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- Definition Represents the number of employee that were covered by collective bargaining agreements with unions. + References No definition available. + Details
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- Definition Represents the number of employee that were covered by collective bargaining agreements with unions that were subject to collective bargaining agreements that expired in current year, and are now operating without a contract. + References No definition available. + Details
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- Definition Represents the number of misdemeanor counts of violations of Section 407 of the Rivers and Harbors Act of 1899, "Refuse Act" + References No definition available. + Details
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- Definition Represents the amount of the penalty for violations of Section 407 of the Rivers and Harbors Act of 1899, "Refuse Act". + References No definition available. + Details
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- Definition Represents the amount of the penalty for violations of Section 407 of the Rivers and Harbors Act of 1899, "Refuse Act" in the form of a community service payment. + References No definition available. + Details
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- Definition Represents the amount of the penalty for violations of Section 407 of the Rivers and Harbors Act of 1899, "Refuse Act" in the form of a fine. + References No definition available. + Details
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- Definition Period the contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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