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SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 item | Dec. 31, 2013 | Dec. 31, 2012
Impairment of Investment |  |  |
Impairment charges related to investment in Terminal joint venture | $ 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities | $ 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities | $ 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities
Impairment of Vessels and Equipment |  |  |
Impairment charges of vessels and equipment | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse |
Dry-docking |  |  |
Number of dry-docking inspections to be made within a specified period | 2 matx_NumberOfDryDockingInspectionsToBeMadeWithinSpecifiedPeriod |  |
Period within which number of specified dry-docking inspections to be made | 5 years |  |
Number of non-U.S. flag vessels in operations | 4 matx_NumberOfNonUSFlagVesselsInOperation |  |
Number of non-U.S. flag vessels owned | 1 matx_NumberOfNonUSFlagVesselsOwned |  |
Number of non-U.S. flag vessels under bareboat charter | 1 matx_NumberOfNonUSFlagVesselsUnderBareboatCharters |  |
Number of non-U.S. flag vessels under time charter | 2 matx_NumberOfNonUSFlagVesselsUnderTimeCharters |  |
Dry-dock interval, minimum | 2 years |  |
Dry-dock interval, maximum | 5 years |  |
Deferred dry-docking costs | $ 47.5 us-gaap_DeferredCosts | $ 56.9 us-gaap_DeferredCosts |
Vessels | Minimum |  |  |
Depreciation |  |  |
Useful life | 5 years |  |
Vessels | Maximum |  |  |
Depreciation |  |  |
Useful life | 40 years |  |
Machinery And Equipment | Minimum |  |  |
Depreciation |  |  |
Useful life | 2 years |  |
Machinery And Equipment | Maximum |  |  |
Depreciation |  |  |
Useful life | 20 years |  |
Terminal Facilities | Minimum |  |  |
Depreciation |  |  |
Useful life | 2 years |  |
Terminal Facilities | Maximum |  |  |
Depreciation |  |  |
Useful life | 35 years |  |

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- Definition Sum of the carrying amounts of deferred costs that are expected to be recognized as a charge against earnings in periods after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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