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PENSION AND POST RETIREMENT PLANS (Details)	12 Months Ended
	Dec. 31, 2013 plan	Dec. 31, 2012
PENSION AND POST RETIREMENT PLANS
Number of single-employer defined benefit pension funded plans	2
Employee benefit plans
Target allocation (as a percent)	100.00%
Weighted-average asset allocations (as a percent)	100.00%	100.00%
Pension Benefits
Employee benefit plans
One year returns (losses) on plan assets (as a percent)	21.10%
Three year returns (losses) on plan assets (as a percent)	10.20%
Five year returns (losses) on plan assets (as a percent)	12.40%
Long-term average return on plan assets since inception (as a percent)	8.80%
Pension Benefits | Domestic equity securities
Employee benefit plans
Target allocation (as a percent)	53.00%
Weighted-average asset allocations (as a percent)	58.00%	56.00%
Pension Benefits | International equity securities
Employee benefit plans
Target allocation (as a percent)	15.00%
Weighted-average asset allocations (as a percent)	15.00%	14.00%
Pension Benefits | Debt securities
Employee benefit plans
Target allocation (as a percent)	22.00%
Weighted-average asset allocations (as a percent)	18.00%	19.00%
Pension Benefits | Real estate
Employee benefit plans
Target allocation (as a percent)	5.00%
Weighted-average asset allocations (as a percent)	5.00%	5.00%
Pension Benefits | Other and cash
Employee benefit plans
Target allocation (as a percent)	5.00%
Weighted-average asset allocations (as a percent)	4.00%	6.00%

X

- Definition

The percentage of five-year returns (losses) on pension plan assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	matx_
Data Type:	num:percentItemType
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X

- Definition

The percentage of long-term average return on pension plan assets.

+ References

No definition available.

+ Details

Name:	matx_DefinedBenefitPlanLongTermAverageReturnOnPlanAssets
Namespace Prefix:	matx_
Data Type:	num:percentItemType
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X

- Definition

The percentage of one-year returns (losses) on pension plan assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	matx_
Data Type:	num:percentItemType
Balance Type:	na
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X

- Definition

The percentage of three-year returns (losses) on pension plan assets.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the number of single employer defined benefit pension funded plans.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Details

Name:	us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(i)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(i)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

+ Details

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