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Commitments, Guarantees and Contingencies (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2012
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Standby letters of credit [Member] |
Loss Contingencies [Line Items] |
Contingent Obligations, Maximum Exposure | $ 7
Letters of credit amount that enables qualification as self-insurer | 5
Letters of credit to support credit enhancement needs | 2
Performance and customs bonds [Member] |
Loss Contingencies [Line Items] |
Contingent Obligations, Maximum Exposure | 14
U.S. Customs Bonds | 13
Bonds related to transportation and other matters | 1
Benefit plan withdrawal obligations [Member] |
Loss Contingencies [Line Items] |
Multiemployer Plan Withdrawal Obligation | $ 87

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 a recognized obligation to a multiemployer plan in the event that the employer withdraws from the plan. In some situations, withdrawal from a multiemployer plan may result in an employer having an obligation to the plan for a portion of the unfunded benefit obligation of the pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_MultiemployerPlanWithdrawalObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant