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

X

- Details

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- Definition

Represents the number of multiemployer plans in which the entity participates.

+ 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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