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GOODWILL AND INTANGIBLE ASSETS (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2012
Changes in the Company's goodwill |  |  |
Balance at the beginning of the period | $ 27.0 us-gaap_Goodwill | $ 27.4 us-gaap_Goodwill |
Additions | 0.4 us-gaap_GoodwillAcquiredDuringPeriod |  |
Balance at the end of the period | 27.4 us-gaap_Goodwill | 27.4 us-gaap_Goodwill |
Accumulated impairment related to goodwill | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |
Logistics |  |  |
Changes in the Company's goodwill |  |  |
Balance at the beginning of the period |  | 26.6 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 26.6 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember
Balance at the end of the period | 26.6 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 26.6 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember | 26.6 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = matx_LogisticsServicesSegmentMember
Ocean Transportation |  |  |
Changes in the Company's goodwill |  |  |
Balance at the beginning of the period | 0.4 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 0.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember |
Additions | 0.4 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember |  |
Balance at the end of the period | 0.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember | 0.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember |
Goodwill increase | $ 0.4 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember |  |

X
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillAcquiredDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillPeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=matx_LogisticsServicesSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=matx_OceanTransportationSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |