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SIGNIFICANT ACCOUNTING POLICIES - INCOME TAXES (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
SIGNIFICANT ACCOUNTING POLICIES |  |
Tax Act, income tax expense (benefit) |  | $ 3.3
Remeasurement and discrete adjustments related to the Tax Act | $ (2.9) |
Sequestration rate (as a percent) |  | 6.20%

X
- Definition Internal Revenue Service sequestration rate on alternative minimum tax refunds. + References No definition available. + Details
Name: | matx_IncomeTaxesSequestrationRateOnAlternativeMinimuTaxRefunds
Namespace Prefix: | matx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
Name: | matx_TaxCutsAndJobsActOf2017IncomeTaxExpenseBenefit
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of reasonable estimate for income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
Name: | matx_TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateProvisionalIncomeTaxExpenseBenefit
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration