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PENSION AND POST-RETIREMENT PLANS (Details 10) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 plan | Dec. 31, 2013 | Dec. 31, 2012
Multi-employer defined contribution pension plans |  |  |
Defined Contribution Plans |  |  |
Number of Multiemployer Plans | 6 matx_NumberOfMultiemployerPlans / matx_DefinedContributionBenefitPlansDisclosureBenefitPlansAxis = matx_MultiemployerPlansDefinedContributionMember |  |
Employer contributions | $ 3.0 us-gaap_DefinedContributionPlanCostRecognized / matx_DefinedContributionBenefitPlansDisclosureBenefitPlansAxis = matx_MultiemployerPlansDefinedContributionMember | $ 3.0 us-gaap_DefinedContributionPlanCostRecognized / matx_DefinedContributionBenefitPlansDisclosureBenefitPlansAxis = matx_MultiemployerPlansDefinedContributionMember | $ 3.3 us-gaap_DefinedContributionPlanCostRecognized / matx_DefinedContributionBenefitPlansDisclosureBenefitPlansAxis = matx_MultiemployerPlansDefinedContributionMember
401(K) plan |  |  |
Defined Contribution Plans |  |  |
Employer contributions | $ 1.6 us-gaap_DefinedContributionPlanCostRecognized / matx_DefinedContributionBenefitPlansDisclosureBenefitPlansAxis = matx_DefinedContribution401KPlanMember | $ 1.6 us-gaap_DefinedContributionPlanCostRecognized / matx_DefinedContributionBenefitPlansDisclosureBenefitPlansAxis = matx_DefinedContribution401KPlanMember | $ 1.6 us-gaap_DefinedContributionPlanCostRecognized / matx_DefinedContributionBenefitPlansDisclosureBenefitPlansAxis = matx_DefinedContribution401KPlanMember

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- Details
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- Definition Represents the number of multiemployer plans in which the entity participates. + References No definition available. + Details
Name: | matx_NumberOfMultiemployerPlans
Namespace Prefix: | matx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

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- Details
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Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |