XML 71 R60.htm IDEA: XBRL DOCUMENT v2.4.1.9

PENSION AND POST-RETIREMENT PLANS (Details 8) (USD $) In Millions, unless otherwise specified	12 Months Ended
	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	$ 1.6us-gaap_DefinedContributionPlanCostRecognized / matx_DefinedContributionBenefitPlansDisclosureBenefitPlansAxis = matx_DefinedContribution401KPlanMember	$ 1.6us-gaap_DefinedContributionPlanCostRecognized / matx_DefinedContributionBenefitPlansDisclosureBenefitPlansAxis = matx_DefinedContribution401KPlanMember	$ 1.6us-gaap_DefinedContributionPlanCostRecognized / matx_DefinedContributionBenefitPlansDisclosureBenefitPlansAxis = matx_DefinedContribution401KPlanMember
Profit sharing plan
Defined Contribution Plans
Profit sharing expense recorded	$ 1.6matx_DefinedContributionPlanProfitSharingExpense / matx_DefinedContributionBenefitPlansDisclosureBenefitPlansAxis = us-gaap_DeferredProfitSharingMember	$ 1.2matx_DefinedContributionPlanProfitSharingExpense / matx_DefinedContributionBenefitPlansDisclosureBenefitPlansAxis = us-gaap_DeferredProfitSharingMember	$ 1.2matx_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

X

- Details

Name:	matx_DefinedContributionBenefitPlansDisclosuresLineItems
Namespace Prefix:	matx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

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

X

- Definition

Represents the amount of the profit sharing expenses recorded during the period for defined contribution plans.

+ References

No definition available.

+ Details

Name:	matx_DefinedContributionPlanProfitSharingExpense
Namespace Prefix:	matx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

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

X

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	matx_DefinedContributionBenefitPlansDisclosureBenefitPlansAxis=matx_DefinedContribution401KPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	matx_DefinedContributionBenefitPlansDisclosureBenefitPlansAxis=us-gaap_DeferredProfitSharingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: