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PENSION AND POST-RETIREMENT PLANS (Details 8) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
401(K) plan |  |  |
Defined Contribution Plans |  |  |
Employer matching contribution (as a percent) | 4.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / matx_DefinedContributionBenefitPlansDisclosureBenefitPlansAxis = matx_DefinedContribution401KPlanMember |  |
Employer matching contribution expenses | $ 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
Profit sharing plan |  |  |
Defined Contribution Plans |  |  |
Profit sharing expense recorded | $ 1.6 matx_DefinedContributionPlanProfitSharingExpense / matx_DefinedContributionBenefitPlansDisclosureBenefitPlansAxis = us-gaap_DeferredProfitSharingMember | $ 1.2 matx_DefinedContributionPlanProfitSharingExpense / matx_DefinedContributionBenefitPlansDisclosureBenefitPlansAxis = us-gaap_DeferredProfitSharingMember | $ 1.2 matx_DefinedContributionPlanProfitSharingExpense / matx_DefinedContributionBenefitPlansDisclosureBenefitPlansAxis = us-gaap_DeferredProfitSharingMember
Profit sharing plan | Maximum |  |  |
Defined Contribution Plans |  |  |
Contribution percentage | 3.00%matx_DefinedContributionPlanEmployerContributionPercentage / matx_DefinedContributionBenefitPlansDisclosureBenefitPlansAxis = us-gaap_DeferredProfitSharingMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

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- Details
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- Definition The contribution, under the defined contribution plan, made by the employer as a percentage when a minimum threshold of the entity's performance is achieved. + References No definition available. + Details
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- Definition Represents the amount of the profit sharing expenses recorded during the period for defined contribution plans. + References No definition available. + Details
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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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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Details
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Period Type: |