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SIGNIFICANT ACCOUNTING POLICIES - INCOME TAXES (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2018 USD ($)
SIGNIFICANT ACCOUNTING POLICIES |
Tax Act, income tax expense (benefit) | $ 3.1
Sequestration rate (as a percent) | 6.20%

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- Definition Internal Revenue Service sequestration rate on alternative minimum tax refunds. + References No definition available. + Details
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- Definition Amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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