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Income Taxes (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2012
Income Taxes |  |
Non-deductible separation costs | $ 1.2 | $ 1.7

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- Definition The portion of the difference between total income tax expense (benefit) as reported in the income statement for the period and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to nondeductible separation costs under enacted tax laws. + References No definition available. + Details
Name: | matx_IncomeTaxReconciliationNondeductibleExpenseSeparationCost
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration