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DESCRIPTION OF THE BUSINESS (Details) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended | 0 Months Ended
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Nov. 11, 2014 | Dec. 31, 2014 segment item | Dec. 31, 2012 | Jun. 29, 2012 | Jun. 08, 2012 | Dec. 01, 2011 company
DESCRIPTION OF THE BUSINESS |  |  |  |  |  |
Number of segments |  | 2 us-gaap_NumberOfReportableSegments |  |  |  |
Number of vessels owned |  | 18 matx_NumberOfShipsOwned |  |  |  |
Number of chartered vessels |  | 3 matx_NumberOfCharteredVessels |  |  |  |
Horizon Acquisition |  |  |  |  |  |
Acquisition Value | $ 456.0 us-gaap_BusinessCombinationConsiderationTransferred1 |  |  |  |  |
Separation costs |  |  | 8.6 matx_SeparationCost |  |  |
Ocean Transportation | SSAT |  |  |  |  |  |
DESCRIPTION OF THE BUSINESS |  |  |  |  |  |
Ownership interest in SSAT (as a percent) |  | 35.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember |  |  |  |
Number of terminal facilities on which SSAT provides terminal and stevedoring services to Matnav and numerous carriers |  | 6 matx_NumberOfTerminalFacilitiesOnWhichInvesteeProvidesTerminalAndStevedoringServices / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember |  |  |  |
Alexander & Baldwin |  |  |  |  |  |
Horizon Acquisition |  |  |  |  |  |
Number of publicly traded companies to be created after separation |  |  |  |  |  | 2 matx_NumberOfCompaniesToBeCreatedAfterSeparation / dei_LegalEntityAxis = matx_AlexanderAndBaldwinIncMember
Jones Act requirement to maintain status as U.S. citizen, maximum ownership interest permitted by non-U.S. citizens (as a percent) |  | 22.00%matx_MaximumOwnershipPercentageThatMayBeOwnedByNonUSCitizens / dei_LegalEntityAxis = matx_AlexanderAndBaldwinIncMember |  |  |  |
Number of shares of common stock of A&B received for each share upon separation |  |  |  | 1 us-gaap_ConversionOfStockSharesConverted1 / dei_LegalEntityAxis = matx_AlexanderAndBaldwinIncMember |  |
Maximum period during which services are to be provided under Transition Services Agreement |  |  |  |  | 24 months |
Capital contribution to A&B |  |  | 155.7 matx_SeparationCostCapitalDistributions / dei_LegalEntityAxis = matx_AlexanderAndBaldwinIncMember |  |  |
Separation costs |  |  | 8.6 matx_SeparationCost / dei_LegalEntityAxis = matx_AlexanderAndBaldwinIncMember |  |  |
Capitalized debt financing costs |  |  | 1.9 us-gaap_PaymentsOfDebtIssuanceCosts / dei_LegalEntityAxis = matx_AlexanderAndBaldwinIncMember |  |  |
Total cash outflow related to the Separation |  |  | $ 166.2 matx_PaymentsRelatedToSeparation / dei_LegalEntityAxis = matx_AlexanderAndBaldwinIncMember |  |  |

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- Definition Represents the maximum permitted ownership percentage by non-U.S. citizens in order to maintain the entity's status as a U.S. citizen under certain U.S. maritime and vessel documentation laws, popularly referred to as the Jones Act. + References No definition available. + Details
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- Definition Represents the number of chartered vessels. + References No definition available. + Details
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- Definition Represents the number of companies to be created after separation for which the board of directors unanimously approved a plan to pursue the separation. + References No definition available. + Details
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- Definition Represents the number of ships owned by the entity. + References No definition available. + Details
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- Definition Professional fees and other costs associated with the spin-off of the Company's non-transportation segments. + References No definition available. + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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