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COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Standby letters of credit
Commitments, Guarantees and Contingencies
Commitments and financial arrangements	$ 6.8
Letters of credit amount that enables qualification as self-insurance and other insurance programs	5.6
Letters of credit to support credit enhancement needs	1.2
Bonds
Commitments, Guarantees and Contingencies
Commitments and financial arrangements	14.2
U.S. Customs Bonds	13.0
Bonds related to transportation and other matters	1.2
Benefit plan withdrawal obligations
Commitments, Guarantees and Contingencies
Multiemployer Plan Withdrawal Obligation	$ 102.1

X

- Definition

Maximum potential amount of future payments (undiscounted) the Company could be required to make to a surety or lender, from whom the company obtained a bond or letter of credit, if the Company fails to perform and the surety or lender has made payment to the obligee or beneficiary.

+ References

No definition available.

+ Details

Name:	matx_ContingentObligationsMaximumExposure
Namespace Prefix:	matx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Letter of credit amount that enables the entity to qualify as a self-insurer for state and federal workers' compensation liabilities.

+ References

No definition available.

+ Details

Name:	matx_LetterOfCreditAmountThatEnablesQualificationAsSelfInsurer
Namespace Prefix:	matx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the letter of credit amount to support various credit enhancement needs.

+ References

No definition available.

+ Details

Name:	matx_LetterOfCreditAmountToSupportCreditEnhancementNeeds
Namespace Prefix:	matx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Performance guarantees made on transportation and other matters.

+ References

No definition available.

+ Details

Name:	matx_TransportationAndOtherMattersGuarantees
Namespace Prefix:	matx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Maximum potential amount of future payments (undiscounted) the Company could be required to make to a surety or lender, from whom the Company obtained a bond letter of credit, if the Company fails to perform and the surety or lender has made payment to the obligee or beneficiary.

+ References

No definition available.

+ Details

Name:	matx_UsCustomsBonds
Namespace Prefix:	matx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
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