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PENSION AND POST-RETIREMENT PLANS (Details 9) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Multiemployer Plans
Contributions	$ 13.1us-gaap_MultiemployerPlanPeriodContributions	$ 13.1us-gaap_MultiemployerPlanPeriodContributions	$ 13.1us-gaap_MultiemployerPlanPeriodContributions
Multiemployer Plan Withdrawl Obligation	94.8us-gaap_MultiemployerPlansAccumulatedBenefitObligation
Multiemployer Plan Withdrawal Obligation recorded	0us-gaap_MultiemployerPlansWithdrawalObligation	0us-gaap_MultiemployerPlansWithdrawalObligation
Minimum
Multiemployer Plans
Employer matching contribution to MEBA Pension Trust (as a percent)			11.70%matx_DefinedBenefitPlanEmployerMatchingContributionPercent / us-gaap_RangeAxis = us-gaap_MinimumMember
Threshold of total contributions for which planned years are disclosed (as a percent)	5.00%us-gaap_MultiemployerPlansCollectiveBargainingArrangementPercentageOfEmployersContributions / us-gaap_RangeAxis = us-gaap_MinimumMember
Hawaii Terminals Multiemployer Pension Plan | Minimum
Multiemployer Plans
Threshold of total contributions for which planned years are disclosed (as a percent)	5.00%us-gaap_MultiemployerPlansCollectiveBargainingArrangementPercentageOfEmployersContributions / us-gaap_MultiemployerPlanNameAxis = matx_HawaiiTerminalsMultiemployerPensionPlanMember / us-gaap_RangeAxis = us-gaap_MinimumMember	5.00%us-gaap_MultiemployerPlansCollectiveBargainingArrangementPercentageOfEmployersContributions / us-gaap_MultiemployerPlanNameAxis = matx_HawaiiTerminalsMultiemployerPensionPlanMember / us-gaap_RangeAxis = us-gaap_MinimumMember	5.00%us-gaap_MultiemployerPlansCollectiveBargainingArrangementPercentageOfEmployersContributions / us-gaap_MultiemployerPlanNameAxis = matx_HawaiiTerminalsMultiemployerPensionPlanMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Hawaii Stevedoring Multiemployer Retirement Plan | Minimum
Multiemployer Plans
Threshold of total contributions for which planned years are disclosed (as a percent)	5.00%us-gaap_MultiemployerPlansCollectiveBargainingArrangementPercentageOfEmployersContributions / us-gaap_MultiemployerPlanNameAxis = matx_HawaiiStevedoringMultiemployerRetirementPlanMember / us-gaap_RangeAxis = us-gaap_MinimumMember	5.00%us-gaap_MultiemployerPlansCollectiveBargainingArrangementPercentageOfEmployersContributions / us-gaap_MultiemployerPlanNameAxis = matx_HawaiiStevedoringMultiemployerRetirementPlanMember / us-gaap_RangeAxis = us-gaap_MinimumMember	5.00%us-gaap_MultiemployerPlansCollectiveBargainingArrangementPercentageOfEmployersContributions / us-gaap_MultiemployerPlanNameAxis = matx_HawaiiStevedoringMultiemployerRetirementPlanMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Master Mates And Pilots Pension Plan | Minimum
Multiemployer Plans
Threshold of total contributions for which planned years are disclosed (as a percent)		5.00%us-gaap_MultiemployerPlansCollectiveBargainingArrangementPercentageOfEmployersContributions / us-gaap_MultiemployerPlanNameAxis = matx_MasterMatesAndPilotsPensionPlanMember / us-gaap_RangeAxis = us-gaap_MinimumMember	5.00%us-gaap_MultiemployerPlansCollectiveBargainingArrangementPercentageOfEmployersContributions / us-gaap_MultiemployerPlanNameAxis = matx_MasterMatesAndPilotsPensionPlanMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Masters, Mates and Pilots Adjustable Pension Plan
Multiemployer Plans
Contributions	1.0us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = matx_MasterMatesAndPilotsAdjustablePensionPlanMember	0.8us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = matx_MasterMatesAndPilotsAdjustablePensionPlanMember
Masters, Mates and Pilots Adjustable Pension Plan | Minimum
Multiemployer Plans
Threshold of total contributions for which planned years are disclosed (as a percent)		5.00%us-gaap_MultiemployerPlansCollectiveBargainingArrangementPercentageOfEmployersContributions / us-gaap_MultiemployerPlanNameAxis = matx_MasterMatesAndPilotsAdjustablePensionPlanMember / us-gaap_RangeAxis = us-gaap_MinimumMember
M E B A Pension Trust | Minimum
Multiemployer Plans
Threshold of total contributions for which planned years are disclosed (as a percent)		5.00%us-gaap_MultiemployerPlansCollectiveBargainingArrangementPercentageOfEmployersContributions / us-gaap_MultiemployerPlanNameAxis = matx_MEBAPensionTrustMember / us-gaap_RangeAxis = us-gaap_MinimumMember	5.00%us-gaap_MultiemployerPlansCollectiveBargainingArrangementPercentageOfEmployersContributions / us-gaap_MultiemployerPlanNameAxis = matx_MEBAPensionTrustMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Yellow Zone | Hawaii Terminals Multiemployer Pension Plan
Multiemployer Plans
Contributions	5.1us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = matx_HawaiiTerminalsMultiemployerPensionPlanMember / us-gaap_MultiemployerPlanPlanInformationAxis = matx_YellowZoneMember	5.3us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = matx_HawaiiTerminalsMultiemployerPensionPlanMember / us-gaap_MultiemployerPlanPlanInformationAxis = matx_YellowZoneMember	5.1us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = matx_HawaiiTerminalsMultiemployerPensionPlanMember / us-gaap_MultiemployerPlanPlanInformationAxis = matx_YellowZoneMember
Yellow Zone | Hawaii Stevedoring Multiemployer Retirement Plan
Multiemployer Plans
Contributions	2.9us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = matx_HawaiiStevedoringMultiemployerRetirementPlanMember / us-gaap_MultiemployerPlanPlanInformationAxis = matx_YellowZoneMember	2.7us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = matx_HawaiiStevedoringMultiemployerRetirementPlanMember / us-gaap_MultiemployerPlanPlanInformationAxis = matx_YellowZoneMember	2.4us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = matx_HawaiiStevedoringMultiemployerRetirementPlanMember / us-gaap_MultiemployerPlanPlanInformationAxis = matx_YellowZoneMember
Green Zone | Master Mates And Pilots Pension Plan
Multiemployer Plans
Contributions	1.9us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = matx_MasterMatesAndPilotsPensionPlanMember / us-gaap_MultiemployerPlanPlanInformationAxis = matx_GreenZoneMember	2.1us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = matx_MasterMatesAndPilotsPensionPlanMember / us-gaap_MultiemployerPlanPlanInformationAxis = matx_GreenZoneMember	3.4us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = matx_MasterMatesAndPilotsPensionPlanMember / us-gaap_MultiemployerPlanPlanInformationAxis = matx_GreenZoneMember
Green Zone | M E B A Pension Trust
Multiemployer Plans
Contributions	2.1us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = matx_MEBAPensionTrustMember / us-gaap_MultiemployerPlanPlanInformationAxis = matx_GreenZoneMember	2.1us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = matx_MEBAPensionTrustMember / us-gaap_MultiemployerPlanPlanInformationAxis = matx_GreenZoneMember	2.1us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = matx_MEBAPensionTrustMember / us-gaap_MultiemployerPlanPlanInformationAxis = matx_GreenZoneMember
Green Zone | O C U Trust Pension Plan
Multiemployer Plans
Contributions	0.1us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = matx_OCUTrustPensionPlanMember / us-gaap_MultiemployerPlanPlanInformationAxis = matx_GreenZoneMember	0.1us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = matx_OCUTrustPensionPlanMember / us-gaap_MultiemployerPlanPlanInformationAxis = matx_GreenZoneMember	0.1us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = matx_OCUTrustPensionPlanMember / us-gaap_MultiemployerPlanPlanInformationAxis = matx_GreenZoneMember
Multiemployer Benefit Pension Plans
Multiemployer Plans
Number of multiemployer plans	10matx_NumberOfMultiemployerPlans / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPensionMember
Number of collective-bargaining agreements based upon vessels that require contributions	2matx_MultiemployerPlansNumberOfCollectiveBargainingAgreements / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPensionMember
Number of vessels covered	13matx_CollectiveBargainingArrangementNumberOfVesselsCovered / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPensionMember
Multiemployer Benefit Pension Plans | Collective Bargaining Arrangement Contract B
Multiemployer Plans
Number of vessels covered	1matx_CollectiveBargainingArrangementNumberOfVesselsCovered / us-gaap_CollectiveBargainingArrangementAxis = matx_CollectiveBargainingArrangementContractBMember / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPensionMember
Multiemployer Benefit Pension Plans | Red Zone | Maximum
Multiemployer Plans
Funded status of multiemployer plan (as a percent)	65.00%matx_MultiemployerPlanFundedPercentage / us-gaap_MultiemployerPlanPlanInformationAxis = matx_RedZoneMember / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPensionMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Multiemployer Benefit Pension Plans | Yellow Zone | Minimum
Multiemployer Plans
Funded status of multiemployer plan (as a percent)	80.00%matx_MultiemployerPlanFundedPercentage / us-gaap_MultiemployerPlanPlanInformationAxis = matx_YellowZoneMember / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPensionMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Multiemployer Benefit Pension Plans | Green Zone | Minimum
Multiemployer Plans
Funded status of multiemployer plan (as a percent)	80.00%matx_MultiemployerPlanFundedPercentage / us-gaap_MultiemployerPlanPlanInformationAxis = matx_GreenZoneMember / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPensionMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Multiemployer Benefit Postretirement Plans
Multiemployer Plans
Number of multiemployer plans	7matx_NumberOfMultiemployerPlans / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPostretirementBenefitMember
Contributions	$ 11.1us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPostretirementBenefitMember	$ 10.5us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPostretirementBenefitMember	$ 10.8us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPostretirementBenefitMember

X

- Definition

Represents the number of vessels covered relating to the collective-bargaining arrangements.

+ References

No definition available.

+ Details

Name:	matx_CollectiveBargainingArrangementNumberOfVesselsCovered
Namespace Prefix:	matx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the percentage of employees' gross pay for which the employer contributes a matching contribution to a defined benefit plan.

+ References

No definition available.

+ Details

Name:	matx_DefinedBenefitPlanEmployerMatchingContributionPercent
Namespace Prefix:	matx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the funded status of a multiemployer plan.

+ References

No definition available.

+ Details

Name:	matx_MultiemployerPlanFundedPercentage
Namespace Prefix:	matx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of collective-bargaining agreements, in which the entity is a party.

+ References

No definition available.

+ Details

Name:	matx_MultiemployerPlansNumberOfCollectiveBargainingAgreements
Namespace Prefix:	matx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- Definition

Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450702-114947



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450691-114947



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 5

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947

+ Details

Name:	us-gaap_MultiemployerPlanPeriodContributions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of accumulated benefit obligation attributable to the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 7

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450678-114947

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Percentage of contributions required by a collective bargaining arrangement to all contributions required of an employer related to a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 5

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_MultiemployerPlansLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of the obligation recognized by withdrawing from a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

No definition available.

+ Details

Name:	us-gaap_MultiemployerPlansWithdrawalObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_MultiemployerPlanNameAxis=matx_HawaiiStevedoringMultiemployerRetirementPlanMember
Namespace Prefix:
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X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Data Type:	na
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X

- Details

Name:	us-gaap_MultiemployerPlanNameAxis=matx_MEBAPensionTrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MultiemployerPlanPlanInformationAxis=matx_GreenZoneMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MultiemployerPlanPlanInformationAxis=matx_YellowZoneMember
Namespace Prefix:
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X

- Details

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- Details

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Namespace Prefix:
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- Details

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